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Cathode material of thin film lithium ion battery and method for producing the same

A lithium-ion battery and negative electrode material technology, applied in the field of negative electrode materials, can solve the problems of difficult application, deterioration of thin film electrochemical performance, battery capacity and cycle performance, increase in active material content, etc., to reduce charge transfer resistance and excellent cycle Effect of performance, high area specific capacity

Inactive Publication Date: 2008-07-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limited surface area of ​​metal flakes results in deposited films containing too little mass of electrochemically active species to be practical for industrial applications
Although the quality of the active material in the film can be improved by increasing the film thickness, the increase in the content of the active material obtained by this alone is limited
Moreover, since most films are dense films at present, increasing the thickness will inevitably reduce the electrical contact between the film and the substrate, and reduce the contact area between the film and the electrolyte, which will inevitably deteriorate the electrochemical performance of the film, especially under high-rate discharge. Excellent battery capacity and cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1) Place the nickel foam substrate in 40mL 1mol / L NiSO 4 solution, 30mL 0.25mol / L K 2 S 2 O 8 Solution, a mixed solution of 10mL concentrated ammonia water and 20mL water, deposit at 15°C for 1h under stirring, take it out, wash and dry, and calcinate at 350°C for 2h under the protection of argon atmosphere.

[0012] 2) Mix 50mL of 0.006mol / L silver ammonia solution and 50mL of 12g / L polyvinylpyrrolidone ethanol solution, then place the calcined substrate in the mixed solution, and continue to deposit at 70°C for 24h to obtain foamed nickel support NiO / Ag nanocomposite porous films.

[0013] The thickness of the film is 1 μm, the pore diameter of the film is about 200 nm, and the mass percentage is 90% of NiO and 10% of Ag. The reversible capacity of the negative electrode at the current density of 2 / 3C, 2C and 4C is 0.48mAh / cm 2 、0.45mAh / cm 2 and 0.42mAh / cm 2 . Capacities after 50 cycles at these current densities were 0.37 mAh / cm 2 、0.3mAh / cm 2 and 0.28mAh / c...

Embodiment 2

[0015] 1) Place the nickel foam substrate in 40mL 1mol / L NiSO 4 solution, 30mL 0.25mol / L K 2 s 2 O 8 Solution, a mixed solution of 10mL concentrated ammonia water and 20mL water, deposit at 25°C for 3h under stirring, take it out, wash and dry, and calcinate at 350°C for 3h under the protection of argon atmosphere.

[0016] 2) Mix 50mL of 0.01mol / L silver ammonia solution and 50mL of 20g / L polyvinylpyrrolidone ethanol solution, then place the calcined substrate in the mixed solution, and continue to deposit at 70°C for 24h to obtain foam nickel support NiO / Ag nanocomposite porous films.

[0017] The thickness of the film is 2 μm, the pore diameter of the film is about 200 nm, and the mass percentage is 87% of NiO and 13% of Ag. The reversible capacity of the negative electrode at the current density of 2 / 3C, 2C and 4C is 1.02mAh / cm 2 、0.93mAh / cm 2 and 0.8mAh / cm 2 . The capacities after 50 cycles at these current densities were 0.62 mAh / cm 2 、0.47mAh / cm 2 and 0.37mAh / ...

Embodiment 3

[0019] 1) Place the nickel foam substrate in 40mL 1mol / L NiSO 4 solution, 30mL 0.25mol / L K 2 S 2 O 8 Solution, a mixed solution of 10mL concentrated ammonia water and 20mL water, deposit at 50°C for 2h under stirring, take it out, wash and dry, and calcinate at 350°C for 2h under the protection of argon atmosphere.

[0020] 2) Mix 50mL of 0.02mol / L silver ammonia solution and 50mL of 40g / L polyvinylpyrrolidone ethanol solution, then place the calcined substrate in the mixed solution, and continue to deposit at 70°C for 24h to obtain foamed nickel support NiO / Ag nanocomposite porous films.

[0021] The thickness of the film is 5 μm, the pore diameter of the film is about 200 nm, and the mass percentage is 75% of NiO and 25% of Ag. The reversible capacity of the negative electrode at the current density of 2 / 3C and 2C is 2.1mAh / cm 2 and 0.9mAh / cm 2 . Capacities after 50 cycles at these current densities were 0.8 mAh / cm 2 and 0.3mAh / cm 2 .

[0022] The NiO / Ag nanocompos...

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Abstract

The invention discloses cathode material for a membrane lithium ion battery, which is a foaming nickel load NiO / Ag nano composite porous membrane, NiO with a mass percent of 75 percent to 95 percent, and nano metal Ag of 5 percent to 25 percent. The preparation method for the cathode material comprises the following steps: firstly, a foaming nickel substrate is laid into mixture of NiSO4 solution, K2S2O8 solution, strong aqua ammonia and water for sedimentation and then calcined in argon gas; secondly, the substrate after calcinations is laid into mixture of silver-ammonia solution and polyvinylpyrrolidone ethanol solution for continuous sedimentation. Compared with the prior NiO membrane cathode, a cathode of the foaming nickel load NiO / Ag nano composite porous membrane contains more active materials, and contact interface between an electrode and electrolytes is larger and lithium ion battery diffusion path is shorter. Moreover, the cathode still has high area specific capacity and superior cyclicity even under the condition of high rate.

Description

technical field [0001] The invention belongs to negative electrode materials of thin-film lithium ion batteries, in particular to a preparation method of NiO / Ag porous thin-film electrodes supported by foamed nickel. Background technique [0002] Compared with traditional thin-film secondary batteries, thin-film lithium-ion batteries have the advantages of high average voltage (about 3.6V), high capacity density, no memory effect, and no environmental pollution. Conventional thin-film lithium-ion batteries use metal foils as current collectors to support thin films. The limited surface area of ​​metal flakes leads to the deposition of thin films containing too little electrochemically active species for industrial applications. Although the quality of the active material in the film can be improved by increasing the thickness of the film, the increase in the content of the active material obtained only by this is limited. Moreover, since most films are dense films at prese...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/04H01M4/38H01M4/52
CPCY02E60/10
Inventor 涂江平黄小华相佳媛王秀丽
Owner ZHEJIANG UNIV
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