CN116387705A - A mold for dual-electrolyte lithium-air batteries operating in pure oxygen - Google Patents

Abstract

The invention relates to a die capable of realizing the operation of a double-electrolyte lithium air battery in pure oxygen. The technical proposal is as follows: the oxygen-enriched air purifier comprises an anode shell, a cathode shell, a gas pressure gauge, an anode plate, a pre-tightening spring and an oxygen transmission pipeline, wherein an oxygen cavity is arranged at the upper part of the center of the anode shell, an anode cavity is arranged at the lower part of the center of the anode shell, a cathode cavity is arranged at the top of the cathode shell, and the anode shell is fixedly arranged above the cathode shell; the inner wall of the upper part of the oxygen cavity is provided with a pre-tightening thread, the gas pressure gauge is in threaded connection with the positive electrode shell through the pre-tightening thread, the positive electrode plate is placed on the bottom wall of the oxygen cavity, the pre-tightening spring is arranged between the gas pressure gauge and the positive electrode plate, and the gas pressure gauge is matched with the pre-tightening thread to enable the pre-tightening spring to be tightly attached to the positive electrode plate; the oxygen transmission pipeline penetrates through the side wall of the anode shell and is communicated with the oxygen cavity. The invention can transmit oxygen and prevent the electrolyte from evaporating, thereby improving the electrochemical performance of the battery.

Description

A mold for double-electrolyte lithium-air batteries operating in pure oxygen

technical field

The invention relates to a lithium-air battery, in particular to a mold capable of realizing the operation of a double-electrolyte lithium-air battery in pure oxygen.

Background technique

The energy density of lithium-ion batteries is approaching the theoretical limit. With the continuous development of people's living standards, the demand for high-efficiency energy has increased, and rechargeable metal-air batteries have become a research hotspot in the field of scientific research due to their ultra-high energy density. Among many metal-air batteries, lithium-air batteries have the highest theoretical energy density of 11140Wh kg ^-1 , so they have attracted widespread attention. The double-electrolyte lithium-air battery has a small overpotential, the aqueous electrolyte it uses is safe and harmless, and the discharge product LiOH dissolves in water and will not block the positive electrode. Therefore, the double-electrolyte lithium-air battery is the most potential energy storage system. At present, the dual-electrolyte lithium-air battery mold has low discharge capacity, the battery runs directly in the air, the aqueous electrolyte evaporates quickly, and the impurities in the air react with the electrolyte to block the positive electrode.

Contents of the invention

The invention provides a mold capable of realizing the operation of a double-electrolyte lithium-air battery in pure oxygen, which can transmit oxygen to the double-electrolyte lithium-air battery and is integrally sealed to effectively prevent electrolyte evaporation, thereby improving the electrochemical performance of the battery.

Technical scheme of the present invention is as follows:

A mold capable of realizing the operation of a double-electrolyte lithium-air battery in pure oxygen, including a positive electrode casing, a negative electrode casing, a gas pressure gauge, a positive electrode sheet, a pre-tension spring and an oxygen transmission pipeline, and the upper center of the positive electrode casing is oxygen chamber, the lower part is a positive electrode chamber, the top of the negative electrode casing is provided with a negative electrode chamber, and the positive electrode casing is fixedly arranged above the negative electrode casing; the upper inner wall of the oxygen chamber is provided with pre-tightened threads, and the gas pressure The gauge is screwed onto the positive electrode casing through a pre-tightening thread, the positive electrode piece is placed on the bottom wall of the oxygen chamber, and the pre-tension spring is arranged between the gas pressure gauge and the positive electrode piece, the The gas pressure gauge cooperates with the pre-tightening thread to make the pre-tightening spring close to the positive electrode sheet; the oxygen transmission pipe penetrates the side wall of the positive electrode casing and communicates with the oxygen chamber.

Further, in the mold that can realize the operation of the double-electrolyte lithium-air battery in pure oxygen, the side of the positive electrode casing is provided with a positive electrode current collector, and the side of the negative electrode casing is provided with a negative electrode current collector; the positive electrode The material of the shell, the negative electrode shell, the positive electrode current collector and the negative electrode current collector is all stainless steel.

Further, in the mold that can realize the operation of the double-electrolyte lithium-air battery in pure oxygen, a non-woven diaphragm is provided under the positive electrode sheet; the material of the positive electrode sheet is carbon paper; the material of the non-woven diaphragm is For polypropylene.

Further, in the mold that can realize the operation of the double-electrolyte lithium-air battery in pure oxygen, the oxygen cavity communicates with the positive electrode cavity, the inner diameter of the oxygen cavity is larger than the inner diameter of the positive electrode cavity, and the bottom of the oxygen cavity is The wall is circular; the non-woven diaphragm is placed on the bottom wall of the oxygen chamber, the positive electrode is placed on the non-woven diaphragm, and the pre-tension spring connects the positive electrode and the non-woven The cloth diaphragm is pressed against the bottom wall of the oxygen chamber.

Further, in the mold that can realize the operation of the double-electrolyte lithium-air battery in pure oxygen, the positive electrode casing and the negative electrode casing are fixedly connected by bolts.

Further, in the mold that can realize the operation of the double-electrolyte lithium-air battery in pure oxygen, a sealing gasket is provided between the positive electrode casing and the negative electrode casing, and a sealing gasket is provided between the gas pressure gauge and the positive electrode casing. With sealing ring.

Further, in the mold that can realize the operation of the double-electrolyte lithium-air battery in pure oxygen, the lower end of the positive electrode cavity is provided with a solid electrolyte membrane, and the material of the solid electrolyte membrane is conductive ceramics.

Further, in the mold capable of realizing the operation of the double-electrolyte lithium-air battery in pure oxygen, the cathode electrolyte is placed in the anode cavity.

Further, in the mold capable of realizing the operation of the double-electrolyte lithium-air battery in pure oxygen, the negative electrode module is arranged in the negative electrode cavity.

Further, in the mold that can realize the operation of the double-electrolyte lithium-air battery in pure oxygen, the gas transmission pipeline is connected to the oxygen cylinder, and oxygen is transmitted into the oxygen cavity through the gas transmission pipeline.

The beneficial effects of the present invention are:

1. In the present invention, the positive electrode casing is provided with an oxygen transmission pipeline, and oxygen is introduced into the oxygen chamber. The positive electrode reactant has only oxygen and no other impurity gases, so as to avoid other impurities in the air from reacting with the electrolyte; at the same time, the entire device is sealed to prevent The evaporation of the electrolyte improves the performance of the double-electrolyte lithium-air battery as a whole.

2. In the present invention, by rotating the gas pressure gauge, the pre-tightening spring compresses the positive plate, which can effectively prevent the electrolyte from evaporating. At the same time, the non-woven separator can prevent the positive electrode electrolyte from evaporating and prevent the positive electrode electrolyte from washing away the catalyst.

3. The side of the positive electrode casing is provided with a positive electrode current collector and the side of the negative electrode casing is provided with a negative electrode current collector, which makes it easy to connect when testing the battery.

Description of drawings

Figure 1 is a schematic diagram of a mold that can realize the operation of a double-electrolyte lithium-air battery in pure oxygen;

Figure 2 is an enlarged view of A in Figure 1;

Figure 3 is the test diagram of the first cycle of constant current and constant volume charge and discharge under the action of air and oxygen respectively.

Detailed ways

As shown in Figure 1-2, a mold that can realize the operation of a double-electrolyte lithium-air battery in pure oxygen includes a positive electrode casing 6, a negative electrode casing 5, a gas pressure gauge 1, a positive electrode piece, a preload spring 8 and oxygen Transmission pipeline 7, the upper part of the center of the positive electrode casing 6 is an oxygen chamber 9, and the lower part is a positive electrode chamber 10, the oxygen chamber 9 communicates with the positive electrode chamber 10, and the inner diameter of the oxygen chamber 9 is larger than the inner diameter of the positive electrode chamber 10, The bottom wall of the oxygen chamber 9 is circular; the top of the negative electrode casing 5 is provided with a negative electrode chamber 11, and the negative electrode chamber 11 is provided with a negative electrode module; the positive electrode casing 6 is fixedly arranged on the negative electrode casing Above the body 5, a sealing gasket is provided between the positive electrode casing 6 and the negative electrode casing 5, and the positive electrode casing 6 and the negative electrode casing 5 are fixedly connected by bolts 2; the side of the positive electrode casing 6 is provided with a positive electrode A current collector 3, the side of the negative electrode casing 5 is provided with a negative electrode current collector 4; the materials of the positive electrode casing 6, the negative electrode casing 5, the positive electrode current collector 3 and the negative electrode current collector 4 are all made of stainless steel; the oxygen chamber The upper inner wall of 9 is provided with a pre-tightening thread, the gas pressure gauge 1 is screwed on the positive electrode casing 6 through the pre-tightening thread, and a sealing ring is provided between the gas pressure gauge 1 and the positive electrode casing 6 12. The non-woven fabric diaphragm is placed on the bottom wall of the oxygen chamber 9, the positive electrode piece is placed on the non-woven fabric diaphragm, and the pre-tension spring 8 is arranged between the gas pressure gauge 1 and the positive electrode piece In between, the pre-tension spring 8 presses the positive electrode piece and the non-woven fabric diaphragm on the bottom wall of the oxygen chamber 9; the material of the positive electrode plate is carbon paper; the material of the non-woven fabric diaphragm It is polypropylene; the lower end of the positive electrode cavity 10 is provided with a solid electrolyte membrane, and the material of the solid electrolyte membrane is conductive ceramics; the positive electrode electrolyte is placed in the positive electrode cavity 10; the oxygen transmission pipe 7 penetrates into the positive electrode shell The side wall of the body 6 communicates with the oxygen chamber 9, the gas transmission pipeline 7 is connected to the oxygen cylinder, and oxygen is transmitted into the oxygen chamber 9 through the gas transmission pipeline 7.

The above-mentioned mold preparation process that can realize the operation of the double-electrolyte lithium-air battery in pure oxygen includes the following steps:

(1) Assemble in the glove box;

(2) The negative electrode module includes a lithium sheet, a glass fiber membrane and a negative electrode electrolyte; the lithium sheet is placed on the bottom of the negative electrode cavity 11, the glass fiber membrane is placed on the lithium sheet, and the negative electrode electrolyte is dripped into the glass fiber membrane; the negative electrode electrolyte is LiTFSI-TEGDME;

(3) Place a solid electrolyte membrane at the lower end of the positive electrode chamber 10 and seal it with epoxy resin;

(4) Add the positive electrode electrolyte solution dropwise in the positive electrode cavity 10, the positive electrode electrolyte solution is LiOH (1mol/L);

(5) placing the non-woven diaphragm on the bottom wall of the oxygen chamber 9, and placing the positive plate on the non-woven diaphragm;

(6) Connect the positive pole casing 6 and the negative pole casing 5 by bolts 2, and place a sealing gasket between the positive pole casing 6 and the negative pole casing 5;

(7) Place the pre-tension spring 8 on the positive electrode piece; the gas pressure gauge 1 is screwed on the positive electrode housing 6 through the pre-tightening thread, and a sealing ring 12 is arranged between the gas pressure gauge 1 and the positive electrode housing 6;

(8) Connect the oxygen transmission pipeline 7 to the oxygen cylinder, and transmit oxygen to the oxygen chamber 9 through the gas transmission pipeline 7; the gas pressure gauge 1 monitors the air pressure of the oxygen chamber 9 .

The assembled dual-electrolyte lithium-air battery is subjected to a constant-current constant-capacity charge-discharge test, with a protection voltage of 1.5-5V, a current density of 0.1mA/cm2 for the battery charge-discharge test, and a limited reverse capacity of 100mAh/g. Figure 3 shows the first constant-current and constant-capacity charge-discharge tests in oxygen and air respectively. It can be seen that the double-point degraded lithium-air battery working in pure oxygen has a small overpotential and a stable discharge platform, which shows that the lithium-air battery works in pure oxygen. The two-point electrolyte lithium-air battery working in oxygen has good electrochemical performance.

Claims (10)

1. A mold that can realize double-electrolyte lithium-air battery working in pure oxygen, is characterized in that, comprises positive pole housing, negative pole housing, gas pressure gauge, positive pole piece, pretension spring and oxygen transmission pipeline, and described positive pole The upper part of the center of the housing is an oxygen chamber, and the lower part is a positive electrode chamber. The top of the negative electrode housing is provided with a negative electrode chamber, and the positive electrode housing is fixed above the negative electrode housing; the upper inner wall of the oxygen chamber is provided with a preload screw thread, the gas pressure gauge is screwed on the positive electrode casing through pre-tightening threads, the positive electrode piece is placed on the bottom wall of the oxygen chamber, and the pre-tightening spring is arranged between the gas pressure gauge and the positive electrode Between the sheets; the oxygen transmission pipe penetrates through the side wall of the positive electrode casing and communicates with the oxygen cavity. 2. The mold capable of realizing double-electrolyte lithium-air battery working in pure oxygen according to claim 1, characterized in that, the side of the positive electrode casing is provided with a positive electrode current collector, and the side of the negative electrode casing is provided with Negative electrode current collector; the materials of the positive electrode casing, the negative electrode casing, the positive electrode current collector and the negative electrode current collector are all made of stainless steel. 3. the mold that can realize double-electrolyte lithium-air battery work in pure oxygen according to claim 1 is characterized in that, the bottom of the positive electrode sheet is provided with a non-woven diaphragm; the positive electrode sheet material is carbon paper; The material of the non-woven diaphragm is polypropylene. 4. The mold capable of realizing double-electrolyte lithium-air batteries working in pure oxygen according to claim 3, wherein the oxygen cavity communicates with the positive electrode cavity, and the inner diameter of the oxygen cavity is greater than the inner diameter of the positive electrode cavity , the bottom wall of the oxygen chamber is circular; the non-woven diaphragm is placed on the bottom wall of the oxygen chamber, the positive plate is placed on the non-woven diaphragm, and the pre-tension spring will The positive electrode sheet and the non-woven membrane are pressed against the bottom wall of the oxygen chamber. 5 . The mold capable of realizing the operation of the double-electrolyte lithium-air battery in pure oxygen according to claim 1 , wherein the positive electrode casing and the negative electrode casing are fixedly connected by bolts. 6. The mold capable of realizing the operation of the double-electrolyte lithium-air battery in pure oxygen according to claim 1, wherein a sealing gasket is provided between the positive electrode casing and the negative electrode casing, and the gas pressure gauge is connected to the negative electrode casing. A sealing ring is provided between the positive electrode casings. 7. The mold capable of realizing the operation of the dual-electrolyte lithium-air battery in pure oxygen according to claim 1, wherein a solid electrolyte membrane is provided at the lower end of the positive electrode cavity, and the material of the solid electrolyte membrane is conductive ceramics. 8 . The mold capable of realizing double-electrolyte lithium-air batteries working in pure oxygen according to claim 1 , wherein a positive electrolyte is placed in the positive cavity. 9 . The mold capable of realizing the operation of the double-electrolyte lithium-air battery in pure oxygen according to claim 1 , wherein a negative electrode module is arranged in the negative electrode cavity. 10. The mold capable of realizing double-electrolyte lithium-air batteries working in pure oxygen according to claim 1, wherein the gas transmission pipeline is connected to an oxygen cylinder.

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