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Conductive polymer coated nano silicon powder, preparation method and application thereof, and silicon-carbon negative electrode material

A technology of conductive polymer and nano-silica powder, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor conductivity, achieve high conductivity, facilitate migration, and facilitate rapid migration

Pending Publication Date: 2022-05-13
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, to provide a conductive polymer-coated nano-silicon powder, its preparation method and application, and a silicon-carbon negative electrode material. The slowing effect of silicon volume expansion, while using the characteristics of ion-conducting polymers, improves the poor conductivity of silicon materials themselves, thereby improving the comprehensive performance of silicon-carbon materials

Method used

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  • Conductive polymer coated nano silicon powder, preparation method and application thereof, and silicon-carbon negative electrode material
  • Conductive polymer coated nano silicon powder, preparation method and application thereof, and silicon-carbon negative electrode material
  • Conductive polymer coated nano silicon powder, preparation method and application thereof, and silicon-carbon negative electrode material

Examples

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Embodiment 1

[0040] A preparation method of conductive polymer coated nano silicon powder, comprising the following steps:

[0041] (1) Preparation of polyethylene oxide (PEO) glue: add a certain amount of polyethylene oxide powder (polyethylene oxide model: POLYOXTM WSR 308, number average molecular weight is 800W) to deionized water, according to Add polyethylene oxide powder and deionized water at a ratio of 10% solid content of the polyethylene oxide glue, and mix evenly with a double planetary mixer.

[0042] (2) Preparation of nano silicon paste:

[0043] (2.1) Grind the raw silicon powder (the raw silicon powder is metal silicon and obtain micron-sized silicon powder by crushing) and pass through a 325-mesh standard sieve, the particle size is controlled at D50=5~20 μm; then the obtained silicon powder is mixed with isopropanol solution Carry out pre-mixing, add silicon powder and isopropanol according to the ratio of the solid content of the nano-silicon slurry to 15%; use a doubl...

Embodiment 2

[0053] A preparation method of conductive polymer-coated nano-silicon powder is different from Example 1 in that the deionized water in step (1) is replaced with acetonitrile solvent, and other steps are consistent with Example 1. In this embodiment, the conductive polymer-coated nano-silicon powder includes secondary particles formed by bonding and coating nano-silicon particles with polyethylene oxide, and the polyethylene oxide is doped with lithium carbonate. The mass of polyethylene oxide is about 3.5% of the mass of nano-silicon particles, and the mass ratio of lithium carbonate to polyethylene oxide is 0.2:1.

Embodiment 3

[0055] A preparation method of conductive polymer-coated nano-silicon powder. The difference from Example 1 is that the decarbonated lithium in step (3) is replaced by lithium borate, and other steps are consistent with Example 1. In this embodiment, the conductive polymer-coated nano-silicon powder includes secondary particles formed by bonding and coating nano-silicon particles with polyethylene oxide, and the polyethylene oxide is doped with lithium borate. The mass of polyethylene oxide is about 3.5% of the mass of nano-silicon particles, and the mass ratio of lithium borate to polyethylene oxide is 0.2:1.

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Abstract

The invention provides conductive polymer coated nano silicon powder, a preparation method and application thereof, and a silicon-carbon negative electrode material, the conductive polymer coated nano silicon powder comprises secondary particles formed by bonding and coating nano silicon particles with an ionic conductive polymer, and the ionic conductive polymer is doped with a lithium salt. The application of the conductive polymer coated nano silicon powder in preparation of the silicon-carbon precursor specifically comprises the following steps: (1) uniformly mixing the conductive polymer coated nano silicon powder, graphite and a carbon coating agent to obtain mixed powder; and (2) in a nitrogen or inert gas atmosphere, carrying out high-temperature carbonization treatment on the mixed powder, and crushing and sieving to obtain the silicon-carbon precursor. According to the invention, the volume expansion of the nano silicon can be slowed down, the defect of poor conductivity of the silicon material is overcome by utilizing the characteristics of the ionic conductive polymer, and the comprehensive performance of the silicon-carbon material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a conductive polymer-coated nano-silicon powder, a preparation method and application thereof, and a silicon-carbon negative electrode material. Background technique [0002] After more than ten years of development of lithium-ion batteries, so far there has been a bottleneck in the improvement of energy density. The main problem is that the lithium storage capacity of commercialized positive and negative electrode materials has basically reached the theoretical limit. Among them, the capacity of graphite carbon negative electrode materials has reached 360mAh / g, which is close to the theoretical value of 372mAh / g, and the room for improvement is very small. In order to achieve higher energy density, silicon-based materials with a theoretical gram capacity of up to 4200mAh / g have attracted widespread attention. Compared with graphite materials, the theor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62
CPCH01M4/386H01M4/624H01M4/587H01M4/364Y02E60/10
Inventor 罗列科汤刚罗磊彭青姣王双杨乐之涂飞跃曹景超唐唯佳陈鹏覃事彪
Owner CHANGSHA RES INST OF MINING & METALLURGY