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Preparation method of air cathode of magnesium seawater battery

A technology of air cathode and seawater battery, applied in battery electrodes, electrical components, immersion batteries, etc., can solve the problems of air cathode discharge current density to be improved, high failure rate of air cathode, and high requirements of film making process, so as to achieve guaranteed performance , Improve electrode efficiency, reduce the effect of film making process

Active Publication Date: 2017-09-15
NINGBO UNIV
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AI Technical Summary

Problems solved by technology

The air cathode with this structure has the following problems: 1) Since both the catalytic layer and the diffusion layer are film layers, the film-making process is relatively complicated, and the film-making process requires relatively high requirements, so about 50% of the materials may be wasted; 2. ) Since the catalytic layer, the current collecting layer and the diffusion layer are pressed together by pressure, and the magnesium seawater battery uses seawater as the electrolyte, that is, the magnesium seawater battery is immersed in seawater for a long time, so this kind of pressing in The three-layer structure together has a high probability of detaching two by two under long-term seawater erosion, that is, the air cathode with this structure has a higher failure rate under long-term seawater erosion; 3) the discharge of the air cathode with this structure The current density still needs to be improved

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  • Preparation method of air cathode of magnesium seawater battery

Examples

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Effect test

Embodiment 1

[0033] The preparation method of the air cathode of a kind of magnesium seawater battery that this embodiment proposes, its process schematic diagram is as follows figure 1 As shown, it includes the following steps:

[0034] ① Take the prepared catalytic layer, and take the nickel foam with a thickness of 1.5 mm as the current collector layer.

[0035] Here, the preparation process of the catalytic layer is: the mass percentage is 40% carbon black, the mass percentage is 20% catalyst (as the mixture of manganese dioxide and carbon black, the mixture of silver and carbon black) and the mass percentage is 40% The concentration of 60% polytetrafluoroethylene (PTFE) emulsion is placed in ethanol as a dispersant, and stirred for a long time to a paste; then remove the ethanol to obtain a paste; then roll the paste through a film rolling machine A film having a thickness of 0.3 mm was formed, which served as a catalyst layer.

[0036]2. prepare the pasty substance that diffuses: g...

Embodiment 2

[0044] The preparation method of the air cathode of a kind of magnesium seawater battery that this embodiment proposes, its process schematic diagram is as follows figure 1 As shown, it includes the following steps:

[0045] ① Take the prepared catalytic layer, and take the nickel foam with a thickness of 2 mm as the current collector layer.

[0046] Here, the preparation process of the catalytic layer is: the mass percentage is 45% carbon black, the mass percentage is 20% catalyst (as the mixture of manganese dioxide and carbon black, the mixture of silver and carbon black) and the mass percentage is 35% % concentration is that 60% polytetrafluoroethylene emulsion is placed in the ethanol as dispersant, and is stirred to paste for a long time; Then remove ethanol to obtain pasty substance; Roll pasty substance by rolling film machine to form thickness again 0.3 mm membrane, which acts as a catalytic layer.

[0047] 2. prepare the pasty material that diffuses: get the carbon...

Embodiment 3

[0055] The preparation method of the air cathode of a kind of magnesium seawater battery that this embodiment proposes, its process schematic diagram is as follows figure 1 As shown, it includes the following steps:

[0056] ① Take the prepared catalytic layer, and take nickel foam with a thickness of 1 mm as the current collector layer.

[0057] Here, the preparation process of catalytic layer is: the carbon black that mass percentage is 35%, the catalyst (such as the mixture of manganese dioxide and carbon black, the mixture of silver and carbon black) that mass percentage is 25% and mass percentage are 40% The polytetrafluoroethylene emulsion with a concentration of 60% is placed in ethanol as a dispersant, and stirred for a long time until it becomes a paste; mm membrane, which acts as a catalytic layer.

[0058] 2. prepare the pasty material that diffuses: get the carbon black that mass percentage is 38%, the polytetrafluoroethylene emulsion that the concentration of ma...

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Abstract

The invention discloses a preparation method of an air cathode of a magnesium seawater battery. The preparation method comprises the following steps: taking the prepared catalytic layer and taking foamed nickel as a current collecting layer; preparing a paste substance for diffusion; taking carbon black, polytetrafluoroethylene emulsion and a pore forming agent; putting the carbon black, the polytetrafluoroethylene emulsion and the pore forming agent into ethanol serving as a dispersing agent, and stirring to form paste; removing the ethanol to obtain the paste substance for diffusion; injecting the paste substance for diffusion into a cavity in foamed nickel serving as the current collecting layer; superposing the current collecting layer injected with the paste substance for diffusion and the catalytic layer to form a double-layer integrated structure; and decomposing the pore forming agent in the double-layer integrated structure by a pore forming method to finish pore forming and obtain the air cathode. The preparation method of the air cathode of the magnesium seawater battery has the following advantages: the process is simple, the cost is low, and the prepared air cathode is low in failure rate under long-time seawater erosion and high in discharging current density, so that the electric property of the magnesium seawater battery can be improved.

Description

technical field [0001] The invention relates to a battery preparation technology, in particular to a method for preparing an air cathode of a magnesium seawater battery. Background technique [0002] Magnesium seawater batteries use magnesium as the anode and oxygen in the air as the cathode active material. In essence, seawater (sodium chloride solution with a concentration of 3.5%) is used as the electrolyte. The anode reaction, cathode reaction and battery reaction are expressed as follows : [0003] Anode reaction: Mg+2OH - =M(OH) 2 +2e - [0004] Cathode reaction: O 2 +2H 2 O+4e - =4OH - [0005] Battery reaction: Mg+1 / 2O 2 +H 2 O=Mg(OH) 2 [0006] Since the oxygen in the air is inexhaustible, and it does not account for volume and weight in magnesium seawater batteries, compared with traditional batteries (such as zinc-manganese dry batteries), magnesium seawater batteries have low cost, no pollution, and raw materials With a series of advantages such as ...

Claims

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Application Information

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IPC IPC(8): H01M6/34H01M4/88
CPCH01M4/8807H01M4/8864H01M4/8878H01M6/34Y02E60/50
Inventor 许芬苗鹤袁金良蔡真亮赵加佩张迪徐利华周桢浩刘豪杰
Owner NINGBO UNIV
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