Germanium/carbon composite negative electrode material and preparation method thereof

A negative electrode material and carbon composite technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve problems such as low output and volume expansion

Inactive Publication Date: 2015-05-27
SHENZHEN CAPCHEM TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, germanium-based materials have volume expansion problems during charge and discharge, which restricts the stability of electr

Method used

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  • Germanium/carbon composite negative electrode material and preparation method thereof
  • Germanium/carbon composite negative electrode material and preparation method thereof
  • Germanium/carbon composite negative electrode material and preparation method thereof

Examples

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preparation example Construction

[0025] A preparation method of a germanium / carbon composite negative electrode material, comprising: ball milling and mixing germanium dioxide and polyvinylpyrrolidone, and then annealing in an argon-containing hydrogen atmosphere to obtain a germanium / carbon composite negative electrode material.

[0026] The inventors determined through in-depth research that the best effect can be achieved when the weight ratio of germanium dioxide to polyvinylpyrrolidone is in the range of 2:1-1:2. Below or above this range, germanium / carbon composite negative electrode materials can also be produced, and the prepared germanium / carbon composite negative electrode materials are also better. However, the effect obtained by the weight ratio of germanium dioxide to polyvinylpyrrolidone in the range of 2:1 to 1:2 is obviously better than that obtained outside this range, which is manifested in the more uniform particle size distribution of germanium nanocrystals, or the distribution of germanium...

Embodiment 1

[0038] 60 grams of germanium dioxide and polyvinylpyrrolidone PVP-K10 with a weight ratio of 2:1 were mixed by ball milling for 1 hour, and then the mixture was heated in 5% Ar / H at 500°C. 2 Annealing in the atmosphere for 4 hours, the germanium / carbon composite material is obtained. Elemental analysis showed that the weight ratio of germanium: carbon: nitrogen was 68:30.55:1.45. figure 1 Transmission electron micrograph of the germanium / carbon composite material prepared in Example 1. Depend on figure 1 It can be seen that the germanium nanoparticles are uniformly wrapped in the carbon material.

[0039] Mix the synthesized germanium / carbon composite material with conductive carbon black and CMC uniformly in the ratio of 80wt.%: 10wt.%: 10wt.%, and coat them on the copper foil. The electrochemical performance was tested by a button cell. The electrolyte uses 1mol / L LiPF 6 / EC-DEC-DMC (1:1:1, w / w). Discharging / charging were performed at 200mA / g, respectively, and the pot...

Embodiment 2

[0041] 60 grams of germanium dioxide and polyvinylpyrrolidone PVP-K10 with a weight ratio of 1:1 were mixed by ball milling for 1 hour, and the 5% Ar / H at 500 ° C 2 Annealing in the atmosphere for 4 hours, the germanium / carbon composite material is obtained. Elemental analysis showed a germanium:carbon:nitrogen weight ratio of 52:43:5. The transmission electron micrograph of the germanium / carbon composite material prepared in this example is similar to Example 1.

[0042] Mix the synthesized germanium / carbon composite material with conductive carbon black and CMC uniformly in the ratio of 80wt.%: 10wt.%: 10wt.%, and coat them on the copper foil. The electrochemical performance was tested by a button cell. The electrolyte uses 1mol / L LiPF 6 / EC-DEC-DMC (1:1:1, w / w). Discharging / charging were performed at 200mA / g, respectively, and the potential range was 0.01-3.0V. When charging and discharging at a current of 200mA / g, the charge specific capacity can reach 1680mAh / g in th...

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Abstract

The invention discloses a germanium/carbon composite negative electrode material and a preparation method thereof. The preparation method comprises the steps of carrying out ball milling and mixing on germanium dioxide and polyvinylpyrrolidone, annealing at a hydrogen atmosphere in the presence of argon, so as to prepare the germanium/carbon composite negative electrode material. When being used as a negative electrode material of a lithium ion battery, the germanium/carbon composite negative electrode material has the characteristics of good cycling stability and high multiplying power capacity.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a germanium / carbon composite negative electrode material and a preparation method thereof. Background technique [0002] With the depletion of energy sources and the deterioration of the environment, the development of electric vehicles is imperative, for which countries have formulated relevant policies. One of the technical difficulties faced by the promotion of electric vehicles is the restriction of the storage capacity, that is, the battery capacity. Its capacity largely depends on the choice of electrode material. At present, the widely used negative electrode material is mainly graphite, its capacity is about 372mAh / g, and its potential is very close to that of metal lithium. The low capacity and poor safety of graphite materials restrict the development of lithium-ion batteries as power batteries. Therefore, the developmen...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587
CPCH01M4/139H01M4/1393H01M4/362H01M4/38H01M4/583H01M2004/027Y02E60/10
Inventor 李秀马建民毛玉华
Owner SHENZHEN CAPCHEM TECH
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