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Lithium-ion battery germanium/carbon composite negative electrode material and preparation method and application thereof

A lithium-ion battery and negative electrode material technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of limited development, electrode pulverization failure, capacity attenuation, etc., to achieve the suppression of collapse failure, prevention of agglomeration, high quality Effect of capacity and volume ratio capacity

Active Publication Date: 2019-08-02
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume change rate of germanium is as high as 300% in the process of lithium intercalation and deintercalation, which leads to electrode pulverization failure and rapid capacity decay, which limits its development.

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  • Lithium-ion battery germanium/carbon composite negative electrode material and preparation method and application thereof

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preparation example Construction

[0051] A preparation method of a germanium / carbon composite negative electrode material for a lithium ion battery of the present invention, comprising the following steps:

[0052] (1) GeO 2 Dissolve in alkaline solution to form uniform and transparent solution A;

[0053] (2) Add nanocrystalline cellulose to solution A, stir until a uniform first suspension is formed, then adjust the pH value of the first suspension to 6.0-8.0, then add mesophase carbon microspheres, and continue stirring until A uniform second suspension is formed, and then transferred to a water bath at 50°C to 60°C to obtain a second suspension at 50°C to 60°C;

[0054] (3) NaBH 4 The powder is completely dissolved in water at 1°C to 4°C to obtain NaBH 4 solution, then NaBH 4 The solution is added to the second suspension at 50°C to 60°C, stirred and reacted in a water bath at 50°C to 60°C, vacuum filtered after the reaction is completed, and the precipitate obtained is washed until the washed solution...

Embodiment 1

[0061] A germanium / carbon composite negative electrode material for a lithium ion battery of the present invention, which is mainly composed of germanium nanoparticles, mesocarbon microspheres and amorphous carbon, wherein the amorphous carbon layer is coated with nano-scale germanium particles and coated with amorphous carbon The nano-germanium particles in the layer evenly cover the surface of the mesocarbon microspheres, and the amorphous carbon layer acts as a "bridge" connecting the nano-germanium particles and the mesocarbon microspheres. figure 1 shown. Among them, in terms of mass fraction, the content of germanium nanoparticles is 9.7%, the content of mesocarbon microspheres is 88%, and the content of amorphous carbon is 2.3%.

[0062] A kind of preparation method of the lithium ion battery germanium / carbon composite negative electrode material of this embodiment, its preparation process schematic diagram is as follows figure 1 shown, including the following steps: ...

Embodiment 2

[0078] A germanium / carbon composite negative electrode material for a lithium ion battery of the present invention, mainly composed of germanium nanoparticles, mesocarbon microspheres and amorphous carbon, wherein the amorphous carbon layer is coated with nano-scale germanium particles, and the amorphous carbon layer is coated The nano-germanium particles uniformly cover the surface of mesocarbon microspheres, and the amorphous carbon layer acts as a "bridge" connecting germanium and mesocarbon microspheres. Among them, by mass fraction, germanium nanoparticles account for 24.2%, and the mesophase Carbon microspheres are 72.6%, and amorphous carbon is 3.2%.

[0079] A kind of preparation method of the lithium ion battery germanium / carbon composite negative electrode material of this embodiment, its preparation process schematic diagram is as follows figure 1 shown, including the following steps:

[0080] (1) Add 200mL of 0.5M ammonia solution to a 1000mL beaker, add 4.8g of G...

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Abstract

The invention discloses a lithium-ion battery germanium / carbon composite negative electrode material and a preparation method and an application thereof. The composite negative electrode material includes germanium nanoparticles, mesocarbon microbeads and amorphous carbon. The preparation method comprises the steps of (1) dissolving GeO2 in an alkaline solution, adding nanocrystalline cellulose, adjusting the pH-value of the obtained first suspension, adding the mesocarbon microbeads and stirring to form a second suspension, and transferring the second suspension to a water bath; (2) preparingan NaBH4 solution, adding the heated second suspension, stirring for reaction in the water bath, washing wafer vacuum filtration, then carrying out vacuum drying, roasting the dried solid in an inertgas or reducing atmosphere to obtain the product. The composite negative electrode material disclosed by the invention has high mass capacity and volume specific capacity, can effectively alleviate the volume change and pulverization of germanium, is high in cycle stability and good in compatibility with a propylene carbonate containing electrolyte, has the advantages of good low-temperature electrochemical performance and the like and can be applied to lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite materials for electrodes, and relates to a lithium-ion battery germanium / carbon composite negative electrode material and its preparation method and application, in particular to a preparation method using nanometerized germanium nanoparticles to coat mesophase carbon microspheres The germanium / carbon composite lithium-ion battery negative electrode active material and its preparation method and application in lithium-ion batteries. Background technique [0002] With the rapid development of energy storage power supply and electric vehicles, higher requirements are placed on the performance of lithium-ion batteries, and the development of lithium-ion batteries with high energy density has become a research focus. [0003] At present, the commercial negative electrode materials are mainly carbon materials, which are divided into two types: amorphous carbon and graphitized carbon. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 许静李德湛刘双科郑春满
Owner NAT UNIV OF DEFENSE TECH
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