Nanometer silicon and carbon composite negative electrode material and preparation method and lithium ion battery thereof

A technology of negative electrode material and negative electrode active material, which can be used in batteries, battery electrodes, secondary batteries, etc., and can solve the problems of cycle stability, rate performance and unsatisfactory safety performance.

Active Publication Date: 2015-09-30
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, provide a nano-silicon-carbon composite negative electrode material and its preparation method, and solve the technical problems of unsatisfactory cycle stability, rate performance and safety performance of the silicon-carbon composite

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  • Nanometer silicon and carbon composite negative electrode material and preparation method and lithium ion battery thereof
  • Nanometer silicon and carbon composite negative electrode material and preparation method and lithium ion battery thereof
  • Nanometer silicon and carbon composite negative electrode material and preparation method and lithium ion battery thereof

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preparation example Construction

[0034] Correspondingly, the embodiment of the present invention also provides a preparation method of the above-mentioned nano-silicon-carbon composite negative electrode material. The process flow of the nano-silicon-carbon composite negative electrode material preparation method is as follows: figure 2 As shown, it includes the following steps:

[0035] Step S01. Preparation of SiO 2 Coated nano-silicon particles: place the nano-silicon particles in an oxygen-containing atmosphere and calcine and oxidize them at 700-1000°C to obtain SiO 2 Coated nano-silicon particles;

[0036] Step S02. Preparation of embedded nano-SiO 2 Surface Oxide Nano-Si Particles Coated with Organic Carbon Source: Nano-SiO 2 particles, the SiO 2The coated nano-silicon particles, dispersant and organic carbon are dispersed in a solvent, and then spray-dried to obtain nano-SiO 2 Surface oxidized nano-silicon particles coated with an organic carbon source, the surface oxidized nano-silicon particl...

Embodiment 1

[0058] A silicon-carbon composite material and a preparation method thereof. The silicon-carbon composite material preparation method comprises the following specific steps:

[0059] S11: Calcining and oxidizing 3g of nano-silicon powder with a diameter of about 100nm in air at a temperature of 900°C for 3 hours, and cooling to obtain SiO 2 Nano-silica powder coated on the outer layer.

[0060] S12: In this embodiment, the outer-layer-coated nano-silicon powder obtained in step S11 and 1 g of sodium dodecylsulfonate are mixed in an appropriate amount of deionized water, and fully stirred to obtain a stable suspension solution 1. 0.5 g of nano-SiO with a diameter of 15 nm 2 The powder and 22.5g of phenolic resin were evenly dispersed in the ethanol solution to form solution 2. After mixing solution 1 and solution 2 with magnetic stirring and dispersing for 60 minutes, the uniformly dispersed suspension was spray-dried at a high temperature at an inlet temperature of 220° C. ...

Embodiment 2

[0065] A silicon-carbon composite material and a preparation method thereof. The silicon-carbon composite material preparation method comprises the following specific steps:

[0066]S21: Calcining and oxidizing 2g of nano-silicon powder with a diameter of about 100nm in air at a temperature of 900°C for 1 hour, and cooling to obtain SiO 2 Nano-silica powder coated on the outer layer.

[0067] S22: In this embodiment, the outer-coated nano-silicon powder obtained in step S21, 0.02g of coupling agent KH570, and 0.5g of nano-SiO with a diameter of 30nm are selected. 2 The powder and 15g of citric acid were evenly dispersed in the ethanol solution, and after magnetic stirring and dispersion for 60 minutes, the uniformly dispersed suspension was spray-dried at an inlet temperature of 220°C to obtain the precursor of the silicon-carbon composite material.

[0068] S23: Put the precursor of the silicon-carbon composite material in a microwave heating reactor, open the valve of the ...

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Abstract

The invention discloses a nanometer silicon and carbon composite negative electrode material, a preparation method thereof and a lithium ion battery. The nanometer silicon and carbon composite negative electrode material is of a core-shell structure. A gap is formed between the outer wall of a core body and the inner wall of a shell layer, wherein the core body is made of nanometer silicon, and the shell layer is a nanometer porous carbon layer. The preparation method of the nanometer silicon and carbon composite negative electrode material comprises the steps of preparing nanometer silicon particles wrapped by SiO2; preparing nanometer silicon particles, wherein nanometer SiO2 is embedded into the nanometer silicon particles which are wrapped by organic carbon sources, and the surfaces of the nanometer silicon particles are oxidized; performing organic carbon source splitting decomposition on the nanometer silicon particles provided with the embedded nanometer SiO2 and oxidized surfaces and wrapped by the organic carbon sources, performing etching processing on the SiO2 on the nanometer silicon particles provided with the embedded nanometer SiO2 and oxidized surfaces and wrapped by amorphous carbon by adopting HF, and the like. The negative electrode material of the lithium ion battery is the nanometer silicon and carbon composite negative electrode material. The nanometer silicon and carbon composite negative electrode material and the lithium ion battery are excellent in cycling stability, specific capacity, rate capability and safety performance.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a nano-silicon-carbon composite negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] With the extensive development and rapid application of various portable electronic devices and electric vehicles, there is an increasingly urgent demand for high-performance lithium batteries, especially lithium-ion batteries, with high specific capacity, long cycle life and high safety. As one of the key materials of lithium batteries, anode materials play a vital role in improving the performance of lithium batteries. [0003] The current commercialized lithium batteries, such as lithium-ion batteries, still mainly use graphite-based carbon anode materials. It is difficult to meet the requirements of high-performance lithium batteries, which greatly restricts the development and application of lithium batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/38H01M10/0525
CPCH01M4/386H01M4/583H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 符冬菊叶利强陈建军吴微微檀满林马清
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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