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Preparation method of tin of lithium ion battery and conductive polymer composite cathode material membrane

A conductive polymer and lithium-ion battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of cumbersome process and difficult large-scale production, and achieve the effect of firm combination and low density

Active Publication Date: 2014-05-28
威海区域创新中心有限责任公司
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  • Claims
  • Application Information

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Problems solved by technology

In order to improve the adhesion of the tin coating on the surface of the copper substrate, a Chinese invention patent (Wang Jianming et al., Electrodeposition-hydrothermal method for preparing tin anode materials for lithium-ion batteries, authorized announcement number CN 101478038 B) hydrothermally treats tin electrodes. Improves the cycle stability of metal tin electrodes, but the process is cumbersome and difficult to scale production

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  • Preparation method of tin of lithium ion battery and conductive polymer composite cathode material membrane
  • Preparation method of tin of lithium ion battery and conductive polymer composite cathode material membrane
  • Preparation method of tin of lithium ion battery and conductive polymer composite cathode material membrane

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preparation example Construction

[0031] A preparation method of a tin and conductive polymer composite negative electrode material film for a lithium ion battery, the tin and conductive polymer composite negative electrode material film is based on graphite paper, and the metal tin deposited on the surface of the graphite paper is granular , the size of the metal tin is 0.5-2um, the conductive polymer nanofibers are dispersed among the metal tin particles and on the surface, the diameter of the conductive polymer nanofibers is 0.1-0.8 um, specifically including the following steps:

[0032] a. Pretreatment of graphite paper: the graphite paper is cleaned and surface treated by cleaning liquid in the cleaning tank;

[0033] b. Constant current deposition of metal tin: connect the graphite paper to the external power supply through the electrode brush contact, use the graphite plate as the counter electrode, and place it in the tin electrodeposition tank. The temperature of the tin electrodeposition solution in ...

Embodiment 1

[0044] Graphite paper with a thickness of 0.08mm is cleaned and treated on the surface, and enters the electrodeposition tank of metal tin. Graphite paper is the working electrode (connected to the external power supply through the electrode brush), the graphite plate with a thickness of 1 cm is the counter electrode, and the tin electrodeposition solution configuration: 0.6 mol / L sodium stannate, 0.2 mol / L K 4 P 2 o 7 ·3H 2 O, 0.2 mol / L NaOH, 0.25 mol / L ascorbic acid, 0.05 mol / L H 2 o 2 ; The bath pH=9; The bath temperature is 60 degrees; The electrodeposition current density is 0.6 mA / cm 2 , the deposition time is 5 minutes, and the stirring rate of the bath solution is 180 rpm;

[0045] Put the tin / graphite paper material in the polymer monomer solution tank, stir at the bottom of the tank, and the stirring rate is 120 rpm. Then enter the conductive polymer deposition tank, the tin / graphite paper is the working electrode (connected to the external power supply thro...

Embodiment 2

[0048] Graphite paper with a thickness of 0.2mm is cleaned on the surface and enters the electrodeposition tank of metal tin. Graphite paper is the working electrode (connected to an external power source through electrode brush contact), and a graphite plate with a thickness of 1 cm is the counter electrode. Tin electrodeposition solution configuration: 0.4mol / L sodium stannate, 0.2mol / L K 4 P 2 o 7 ·3H 2 O, 0.2mol / L NaOH, 0.25mol / L ascorbic acid, 0.05mol / L H 2 o 2 ;The bath pH=9;The bath temperature is 60 degrees;The electrodeposition current density is 0.8mA / cm 2 , the deposition time is 10 minutes, and the stirring rate of the bath solution is 180rpm;

[0049] Put the tin / graphite paper material in the polymer monomer solution tank, stir at the bottom, and the stirring speed is 120rpm. Then enter the conductive polymer deposition tank, the tin / graphite paper is the working electrode (connected to the external power supply through the electrode brush), and the counte...

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Abstract

The invention discloses a preparation method of tin of a lithium ion battery and a conductive polymer composite cathode material membrane. According to the invention, the tin of the lithium ion battery and the conducting polymer composite cathode material membrane take graphite paper as a substrate, metallic tin deposited on the surface of the graphite paper is in a granular state, and the conductive polymer nano fiber is dispersed between the metallic tin particles and on the surface of the metallic tin particles. The method comprises the following steps: a)pre-treating the graphite paper; b)depositing metallic tin by constant current; c)preparing conductive polymer electrodeposition; d)performing electrochemical synthesis on the conductive polymer membrane by a constant potential method; and f) preparing the tin of the lithium ion battery and the conductive polymer composite cathode material membrane. According to the invention, conductive polymer is dispersed between the metallic tin particles and on the surface of the metallic tin particles, tin plays a electrochemistry role for storing lithium / removing lithium, a conductive polymer network has the conductive effect, and is capable of simultaneously limiting and buffering the volume change of the tin nano particles during a charge and discharge process, the particle agglomeration is avoided, and the cycle stability of the material can be ensured.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a preparation method of a tin and conductive polymer composite negative electrode material film of a lithium ion battery. Background technique [0002] With the increasing demand for energy, the research and development of new energy materials is imminent. Lithium-ion batteries have the advantages of high output voltage, large specific capacity, stable discharge voltage and good safety, and have become one of the hot spots in the research and development of new secondary chemical power sources. The performance of lithium-ion batteries mainly depends on the improvement of the performance of positive and negative active materials. At present, the commonly used anode materials for lithium-ion batteries are mainly carbon materials, and their theoretical specific capacity is relatively low (372mAh / g). At the same time, there are disadvantages such as low initial charge and di...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/387H01M4/624H01M10/052Y02E60/10
Inventor 杨刚尹凡王飞江学范
Owner 威海区域创新中心有限责任公司
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