Silicon-based lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of pole piece processing performance, compaction density limitation, affecting cell capacity and energy density, etc. Chemical properties, good application prospects, the effect of maintaining integrity

Active Publication Date: 2020-01-17
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of the cavity structure, the processing performance and compaction density of the material are greatly limited, which seriously affects the capacity and energy density of the battery cell.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Preparation of a silicon-based lithium-ion battery composite material with a silicon-based composite material as the core and a carbon nanomaterial / polymer hybrid coating layer as the outer shell by spray-drying loading method

[0025] Take 500g of silicon-based composite material, 0.5g of polytetrafluoroethylene, 0.5g of carbon nanotubes, and 25g of polymethyl methacrylate with a particle size of 500nm and add them to 500g of deionized water, stir well and spray at a rate of 50g / min Drying, the inlet temperature is 100°C, taking out, grinding and crushing to obtain a silicon-based lithium-ion battery composite material coated with carbon nanotubes and polymethyl methacrylate on the surface.

Embodiment 2

[0026] Example 2: Fluidized bed loading method to prepare silicon-based lithium-ion battery composite material with silicon-based composite material as the core and carbon nanomaterial / polymer mixed coating layer as the outer shell

[0027] A. Take 500g of silicon-based composite material and add it to the fluidized bed cavity;

[0028] B. Get the mixture of 5g styrene-butadiene rubber and sodium carboxymethyl cellulose, the mixture of 50g carbon nanotubes and graphene, and the bis (2,3-cycloglycerol carbonate) carbonate of 1 μm in 200g particle diameter is added to 1000g In deionized water, after stirring evenly, pump it into the fluidized bed at a rate of 80g / min for reaction. Lithium-ion battery composites based on silicon ester) carbonate, carbon nanotubes and graphene.

Embodiment 3

[0029] Example 3: Preparation of a silicon-based lithium-ion battery composite material with a silicon-based composite material as the core, a carbon nanomaterial / polymer hybrid coating layer as the second outer layer, and a polymer coating layer as the outer shell by spray-drying loading method

[0030] A. Take 500g of silicon-based composite material, 0.5g of polytetrafluoroethylene, 1g of carbon nanotubes, and 30g of polymethyl methacrylate with a particle size of 100nm, add it to 500g of deionized water, stir it evenly and proceed at a rate of 100g / min Spray drying, the inlet temperature is 200°C, take out, grind and crush to obtain a composite material coated with carbon nanotubes and polymethyl methacrylate;

[0031] B. the composite material that above-mentioned step A makes is added in the fluidized bed cavity;

[0032] C. Get 25g tetrakis (1,2-cycloglycerol sulfite) pyromellitic acid ester and add in 125g ethylene carbonate, stir until the solid dissolves completely; ...

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PUM

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Abstract

The invention discloses a silicon-based lithium ion battery negative electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The silicon-basedlithium ion battery negative electrode material sequentially comprises a silicon-based composite material and a carbon nano material/polymer mixed coating layer from inside to outside, wherein the mass ratio of the polymer to the silicon-based composite material is (0.05-0.6): 1, and the mass ratio of the carbon nano material to the silicon-based composite material is (0.001-0.1): 1. The composite material is prepared from a silicon-based composite material, a polymer, a carbon nano material, a binder, deionized water and other raw materials by a spray drying loading method or a fluidized bedloading method. The negative electrode material provided by the invention can effectively release the stress generated by volume expansion under the extremely high pole piece compaction density, caneffectively maintain the integrity of a conductive network and an adhesive network, and can improve the electrochemical performance of a battery cell.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a silicon-based lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] As the negative electrode of lithium-ion batteries, the theoretical capacity of silicon-based materials can reach up to 4200mAh / g. It has the advantages of low potential, stable and long platform discharge, and high safety performance. It is considered to be the most promising high-energy density negative electrode in the market. one of the materials. However, silicon-based materials have a large volume expansion and contraction during the charging and discharging process, which leads to particle crushing, destroys the structure and affects the conductive network to reduce the conductivity, resulting in a rapid decline in reversible capacity and poor cycle performance. [0003] Chinese invention patents CN103474667A, CN102394287A, CN103474...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 黄杰王胜彬丁泽鹏张鹏伟张振宇张超
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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