SiO/C composite cathode material of lithium ion battery and preparation method of SiO/C composite cathode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle stability and high calcination temperature, achieve high specific capacity, low operating temperature, and facilitate industrial production.

Active Publication Date: 2013-05-29
宁波杉杉硅基材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the disadvantages of poor cycle stability and high calcination temperature of existing SiO / C composite negative electrode materials, and provide a SiO / C composite negative electrode with high specific capacity and good cycle stability for lithium-ion batteries The material and its preparation method, the preparation method has relatively low temperature requirements and is more conducive to industrial production

Method used

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  • SiO/C composite cathode material of lithium ion battery and preparation method of SiO/C composite cathode material
  • SiO/C composite cathode material of lithium ion battery and preparation method of SiO/C composite cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Artificial graphite 36g (purchased from Shanghai Shanshan Technology Co., Ltd., trade name YT7-38, D 50 =26μm) in 1L of ethanol to ultra-fine grinding to the average particle size D 50 to 318nm, add 109g tetraethyl orthosilicate TEOS, 4.4g polyvinylpyrrolidone PVP and 2L water, continue to stir to make the dispersion even; N 2 Under 500 ℃ pyrolysis for 5 hours to obtain black powder 65g; 220g citric acid (C 6 h 8 o 7 .H 2 O) be dissolved in 2L ethanol, add above-mentioned solid wherein and continue ball milling after 1 hour, evaporate solvent at room temperature, in 100%N 2 Perform pyrolysis at 450°C for 3 hours, crush and classify through a 300-mesh sieve to obtain the average particle size D 50 7.5μm SiO / C composite anode material.

[0034] Electrochemical performance test method:

[0035] In order to test the performance of the SiO / C composite negative electrode material for the lithium ion battery prepared in this example, a lithium ion battery was prepared ...

Embodiment 2

[0039] Artificial graphite 36g (purchased from Shanghai Shanshan Technology Co., Ltd., trade name is FSN-1, D 50 =25μm) in 1.2L of ethanol to ultra-fine grinding to the average particle size D 5 To 352nm, add 81g tetraethyl orthosilicate TEOS, 5.9g polyvinylpyrrolidone PVP and 2L water, continue to stir to make the dispersion uniform; N 2 Under 500°C pyrolysis for 6 hours, 60g of black powder was obtained; 186g of citric acid (C 6 h 8 o 7 .H 2 O) be dissolved in 2L ethanol, add above-mentioned solid wherein and continue ball milling after 1 hour, evaporate solvent at room temperature, in 100%N 2 Perform pyrolysis at 450°C for 3 hours, crush and classify through a 300-mesh sieve to obtain the average particle size D 50 8.2μm SiO / C composite anode material. According to the same electrochemical test method as in Example 1, the first discharge specific capacity of the prepared silicon-carbon composite negative electrode material is 591mAh / g, the charge specific capacity is...

Embodiment 3

[0041] Artificial graphite 36g (purchased from Shanghai Shanshan Technology Co., Ltd., trade name is FSN-1, D 50 =25μm) in 1.5L ethanol to ultra-fine grinding to the average particle size D 5 375nm, add 62g tetraethyl orthosilicate TEOS, 4g polyvinylpyrrolidone PVP and 2L water, continue to stir to make the dispersion uniform; 2 Under 550°C pyrolysis for 6 hours, 56g of black powder was obtained; 162g of citric acid (C 6 h 8 o 7 .H 2 O) be dissolved in 1.8L ethanol, add above-mentioned solid wherein and continue ball milling after 1 hour, evaporate off solvent at room temperature, in 100%N 2 Perform pyrolysis at 500°C for 2 hours, and pass through a 300-mesh sieve to obtain the average particle size D 50 8.5μm SiO / C composite anode material.

[0042] According to the same electrochemical test method as in Example 1, the first discharge specific capacity of the prepared silicon-carbon composite negative electrode material is 550mAh / g, the charge specific capacity is 506mA...

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Abstract

The invention discloses a preparation method of a SiO/C composite cathode material of a lithium ion battery. The preparation method comprises the following steps of: mixing graphite with an average particle diameter D50 being 300-500nm, ethyl orthosilicate, polyvinylpyrrolidone, ethanol and water, and stirring to enable the materials to be dispersed uniformly; regulating pH to 8-9 by using a pH regulator, removing the solvent after stirring, and carrying out pyrolysis in inert atmosphere at 500-600 DEG C to obtain black powder; and mixing ethanol solution of citric acid with the black powder, volatilizing the solvent after ball-milling for 1-3 hours, and carrying out pyrolysis, classification or screening in inert atmosphere at 450-550 DEG C. The invention also provides the SiO/C composite cathode material prepared by the preparation method. By improving a formula and the preparation method of the SiO/C composite cathode material, the SiO/C composite cathode material of the lithium ion battery with high specific capacity and good cycling performance is obtained, the reversible capacity of the SiO/C composite cathode material exceeds 500 mAh/g, and the capacity retention ratio of the SiO/C composite cathode material is above 90% after 100 cycles of 0.2 C charge and discharge. Moreover, the preparation method provided by the invention is low in operating temperature, thus being more conducive to industrial production.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a SiO / C composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Due to the development of green energy technology and low-carbon economy, there is an increasing demand for next-generation high-performance lithium-ion batteries. Advances in material technology are the basis for the development of the lithium-ion battery industry. At present, commercial lithium-ion battery anode materials mainly use graphite-based anode materials, whose actual specific capacity is close to the theoretical value of 372mAh / g, and it is difficult to have room for improvement. Finding alternative carbon-based anode materials with high specific capacity has become an important issue. direction of development. [0003] As a negative electrode material for lithium-ion batteries, studies have found that as the oxygen content in s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王洁平乔永民刘萍李辉沈龙董爱想丁晓阳牟国宏
Owner 宁波杉杉硅基材料有限公司
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