Preparation method and application of silicon carbon cathode material of lithium ion battery

A silicon-carbon composite material and carbon material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as large volume changes, and achieve the effect of ensuring performance and improving capacity.

Inactive Publication Date: 2019-05-14
BEIJING WANYUAN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method and application of a silicon-carbon negative electrode material for a lithium-ion battery in view of the technical problem that the existing silicon negative electrode material has a large volume change during charging and discharging.

Method used

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  • Preparation method and application of silicon carbon cathode material of lithium ion battery
  • Preparation method and application of silicon carbon cathode material of lithium ion battery
  • Preparation method and application of silicon carbon cathode material of lithium ion battery

Examples

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Embodiment 1

[0028] This embodiment provides a method for preparing a silicon-carbon composite material, which includes the following steps in sequence:

[0029] Step 1. Treatment of silicon fume

[0030] Step 1.1 Preparation of silicon metal composite

[0031] Mix silicon powder and metal powder according to the mass ratio of 1:0.05-1:5, and perform ball milling or grinding for 20 to 30 minutes under the protection of an inert gas or a mixed gas of inert gas and hydrogen to form a powder to obtain a silicon-metal composite; step 1 The metal used is one or more of the metals that can form an alloy with silicon, preferably the metal is iron, aluminum, copper, chromium, nickel, tin, antimony, manganese, calcium, magnesium, cobalt, silver, titanium, One or more of germanium. The mass ratio of silicon powder to metal powder is preferably 1:0.3;

[0032] Step 1.2 Heat Treatment

[0033] The silicon-metal composite obtained in step 1.1 is heat-treated under the protection of an inert gas or ...

Embodiment 2

[0053] The silicon powder and the copper powder were ball-milled at 400 rpm for 10 hours under the protection of argon, and the ball-milled mixture was heated at 500° C. for 5 hours under the protection of a mixed gas of argon and hydrogen. After cooling, the powder sample is etched with dilute nitric acid solution to remove the copper component and unreacted copper powder in the copper-silicon alloy, washed with water and then dried as a porous silicon material. The porous silicon material is dispersed in the PVA aqueous solution, spray-dried and granulated. The obtained product is pyrolytically carbonized at high temperature under the protection of argon to obtain a silicon-carbon composite material. The SEM pattern of Si / Cu ball milling heat treatment is as follows figure 1 As shown, the first charge-discharge curve of the silicon-carbon composite material is as follows figure 2 shown.

Embodiment 3

[0055] The silicon powder and the silver powder were ball-milled at 400 rpm for 10 hours under the protection of argon, and the ball-milled mixture was heated at 700°C for 5 hours under the protection of a mixed gas of argon and hydrogen. After cooling, the obtained silicon-metal composite material is mixed with natural graphite in proportion, and the product is mixed evenly with asphalt in proportion. The mixture is pyrolytically carbonized at high temperature under the protection of argon to obtain a silicon-carbon composite material. Cyclic stability curves and Coulombic efficiency of silicon-carbon composites such as image 3 shown.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a silicon carbon cathode material of a lithium ion battery. The preparation method comprises the steps that silicon and metal are compounded through ball milling or grinding, and the material is carbon coated by combining pyrolysis of an organic carbon source. In the steps, the capacity development, charging and discharging efficiency and cycle stability of silicon materials are further improved by introducing acid etching, ball milling or grinding mixed with carbon materials and other means. The invention further relates to a preparation method of a negative electrode of the lithium ion battery. The negative electrode prepared by the preparation method can fully ensure the performance of the silicon carbon negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method and application of a silicon-carbon negative electrode material for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in many fields due to their advantages such as high energy density, high operating voltage, wide temperature range, no memory effect, no pollution, and long cycle life. At present, lithium-ion batteries are commonly used in portable electronic devices, electric toys, and electric tools, and are gradually expanding to fields such as electric bicycles, electric vehicles, and new energy storage. New application fields also put forward new requirements for the performance of lithium-ion batteries, such as higher energy density, better safety performance and rate performance, etc., and these have also become bottlenecks that hinder the large-scale promotion of lithium-ion batt...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCY02E60/10
Inventor 孙利佳安永昕曹炬
Owner BEIJING WANYUAN IND
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