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Single-layer/double-layer coated silicon oxide composite anode material and preparation method thereof

A negative electrode material, silicon oxide technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low material compaction density and difficult control of silicon source agglomeration, and achieve reduced volume expansion effect, high stability, and improved cyclic effect

Active Publication Date: 2018-04-24
ETRUST POWER ETP GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not easy to control the silicon source agglomeration, and the compacted density of the prepared material is low.

Method used

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  • Single-layer/double-layer coated silicon oxide composite anode material and preparation method thereof
  • Single-layer/double-layer coated silicon oxide composite anode material and preparation method thereof
  • Single-layer/double-layer coated silicon oxide composite anode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0046] see figure 1 , a double-layer coated silicon oxide composite negative electrode material, the double-layer coated silicon oxide composite negative electrode material 100 is a three-layer composite material with a core-shell structure, wherein the inner core is a silicon-oxygen precursor 110, and the middle layer is titanium The lithium oxide layer 120 has a carbon layer 130 coated on the outer surface of the lithium titanate layer 120 as the outermost layer, and the silicon-oxygen precursor 110 is a material formed by uniformly dispersing nano-silicon 111 in silicon dioxide 112 . Preferably, the silicon-oxygen precursor is SiO x , where 0.5<x<1.5. The thickness of the lithium titanate layer is 5-500 nm, and the thickness of the carbon layer is 0.05-10 μm.

[0047] A method for preparing a double-layer coated silicon oxide composite negative electrode material, comprising the following steps:

[0048] 1) Mix 10g of nano-silicon and 21.4g of nano-silicon dioxide (molar...

Embodiment 2

[0053] A method for preparing a double-layer coated silicon oxide composite negative electrode material, comprising the following steps:

[0054] 1) Mix 7.5g of nano-silicon and 21.4g of nano-silicon dioxide and ball mill, ball mill at a speed of 300rpm for 3 hours, mix the materials evenly to obtain a mixture, and roast the mixture at 1500°C for 6 hours under vacuum conditions, cool it, and crush it with a crusher until the particle size is 10-50 μm; and ball milling for 6 hours to obtain the silicon-oxygen precursor, wherein the particle size of the silicon-oxygen precursor is 2-10 μm.

[0055] 2) Put 5g of silicon-oxygen precursor into 50ml of absolute ethanol solution containing 0.5g of tetrabutyl titanate, stir for 6h, then add 5ml of water and stir for 60min; then add 50mL of acetone solution containing 0.11g of lithium oxalate, and finally Add 1g of glacial acetic acid and stir evenly, stop stirring when the sol turns into a gel, then age the resulting gel for 12 hours,...

Embodiment 3

[0059] A method for preparing a double-layer coated silicon oxide composite negative electrode material, comprising the following steps:

[0060] 1) Mix 10g of nano-silicon and 21.4g of nano-silicon dioxide (molar ratio is 1:1) and ball mill, and ball mill at a speed of 300rpm for 3h to mix the materials evenly to obtain a mixture. Under vacuum conditions, bake the mixture at 2000°C for 8h , cooled, and crushed with a crusher to a particle size of 10-50 μm; and then ball milled for 6 hours to obtain a silicon-oxygen precursor, wherein the particle size of the silicon-oxygen precursor is 2-10 μm.

[0061] 2) Put 5g of silicon-oxygen precursor into 50ml of absolute ethanol solution containing 0.25g of tetrabutyl titanate, stir for 6h, then add 5ml of water and stir for 60min; then add 50mL of absolute ethanol containing 0.1g of lithium chloride solution, finally add 1g of glacial acetic acid and stir evenly, stop stirring when the sol turns into a gel, then age the resulting gel...

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Abstract

The invention provides a single-layer / double-layer coated silicon oxide composite anode material and a preparation method thereof. The single-layer coated silicon oxide composite anode material is a two-layer composite material which has a core-shell structure, an inner core is a silica precursor, an outer layer is a lithium titanate layer, and the silica precursor is a material which is formed byuniformly dispersing and distributing silicon on silica. The double-layer coated silicon oxide composite anode material is a three-layer composite material which has a core-shell structure, an innercore is a silica precursor, a middle layer is a lithium titanate layer, and the outermost layer is a carbon layer which coats the outer surface of the lithium titanate layer. The double-layer coated silicon oxide composite anode material has the three-layer structure, the inner core is the silica precursor, the middle layer is the lithium titanate layer, the outermost layer is the carbon layer, the volume effect of silicon oxide can be buffered well, and thus, the double-layer coated silicon oxide composite anode material has high specific capacity and excellent cycle performance.

Description

technical field [0001] The invention relates to the field of battery negative electrode materials, in particular to a single-layer / double-layer coated silicon oxide composite negative electrode material and a preparation method thereof. Background technique [0002] According to the planning of my country's "Energy Saving and New Energy Vehicle Technology Roadmap", by 2020, the target energy density of a single battery for pure electric vehicles in my country will be 300Wh / kg. At present, the main way to achieve this goal is to develop high-energy-density electrode materials, and it is particularly important to actively develop new negative electrode materials to improve the energy density of lithium-ion batteries. Silicon-based anode materials are one of the most researched high-capacity anode materials at present. Although the silicon negative electrode capacity is as high as 4200mAh / g, the silicon negative electrode material is accompanied by a volume expansion of 300% w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62
CPCH01M4/366H01M4/386H01M4/483H01M4/62H01M4/628Y02E60/10
Inventor 柳听前刘灿刘丰邵乐强程君
Owner ETRUST POWER ETP GRP LTD
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