Graphene modified silicon monoxide and carbon composite microsphere, and preparation method and application thereof

A technology of graphene modification and silicon oxide, which is applied in the direction of electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of difficult preparation of electrode materials, poor material rate performance, and low tap density. Good cycle stability, low cost, and the effect of improving conductivity

Active Publication Date: 2017-02-15
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the above-mentioned composite system, the material rate performance is poor, the tap density is low, and the dispersibility after nanometerization is poor, and the specific surface area is large. It is difficult to prepare an electrode material with high cycle efficiency and close cycle stability.

Method used

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  • Graphene modified silicon monoxide and carbon composite microsphere, and preparation method and application thereof
  • Graphene modified silicon monoxide and carbon composite microsphere, and preparation method and application thereof
  • Graphene modified silicon monoxide and carbon composite microsphere, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1) Preparation of silicon oxide dispersion: disperse the raw material of medium temperature pitch and silicon oxide in a mass ratio of 1:1, and the graphene material of 10% (mass fraction) of the above raw material in polydimethylsiloxane In alkane, organic solvent: raw material is 10:1, and the viscosity of the ball mill slurry is 500-1000Pa·s. Use a ball mill for ball milling, use a ball mill for ball milling, add zirconia balls during ball milling, the size of the zirconia balls is 0.1mm, the mass ratio of zirconia balls to pitch, silicon oxide, and graphene is X=30, and X is the mass ratio of zirconia balls The quality of quality / (pitch+silicon oxide+graphene), ball mill rotating speed is 800rpm, and ball milling time is 2h, and ball milling is carried out under inert protective atmosphere;

[0034] Step 2) Add 5 μm flake graphite to the grinding liquid, the amount of flake graphite is 20% of the raw material ratio, and carry out further ball milling, add zirco...

Embodiment 2

[0045] It differs from Example 1 only in that the mass ratio of medium-temperature pitch to silicon oxide in step 1) is 2:1;

[0046] The carbonization temperature of step 5) is 800 DEG C

[0047] The characterization of silicon oxide and carbon composite material is the same as that of Example 1.

[0048] The positive electrode, negative electrode, electrolyte and battery assembly of the battery are the same as in Example 1. The composition of the obtained silicon oxide and carbon electrode materials and the test results of the battery are listed in Table 1 and Table 2.

Embodiment 3

[0050] It differs from Example 1 only in that the mass ratio of medium-temperature pitch to silicon oxide in step 1) is 3:1, and the carbonization temperature in step 5) is 700°C.

[0051] The characterization of silicon oxide and carbon composite material is the same as that of Example 1.

[0052] The positive electrode, negative electrode, electrolyte and battery assembly of the battery are the same as in Example 1. The composition of the obtained silicon oxide and carbon electrode materials and the test results of the battery are listed in Table 1 and Table 2.

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Abstract

The invention provides a graphene modified silicon monoxide and carbon composite microsphere prepared from graphene, asphalt and silicon monoxide, and a preparation method and an application thereof. Asphalt and silicon monoxide bulk are adopted as raw materials, so the cost is low; a high temperature and high pressure reaction is adopted to obtain a silicon monoxide and carbon composite material in a liquid phase, so the technology is simple; and a dispersant can be recycled, so no waste liquid is generated, and no toxic substances are discharged. The above obtained material has a small specific surface area, and is in favor of forming a stable SEI film; a graphene two-dimensional material has an obvious modification effect, effectively connects active substances, and alleviates volume expansion of an electrode, and good dispersion and reasonable cavity of silicon monoxide make the material have excellent cycle performances.

Description

technical field [0001] The invention relates to a graphene modified silicon oxide and carbon composite microsphere negative electrode material, in particular to the application of the graphene modified silicon oxide and carbon composite microsphere negative electrode material as a high specific capacity lithium ion battery negative electrode material. [0002] Background technique: [0003] Lithium-ion batteries have outstanding advantages such as high specific energy, small self-discharge, long service life, green and pollution-free, and have been widely used in portable electronic products and electric vehicles. With the development and progress of society, the further application of lithium-ion batteries urgently needs to increase the energy density, and the development of electrode materials with high specific capacity is one of the effective ways. [0004] Among the negative electrode materials, carbon materials are mainly commercialized at present, but their theoretical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M4/62
CPCH01M4/364H01M4/48H01M4/587H01M4/625H01M2220/20H01M2220/30Y02E60/10
Inventor 郭玉国李金熠徐泉殷雅侠
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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