Nano-Si or nano-Sn containing composite cathode material for lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of nanomaterials and chemical power sources, can solve problems such as cycle instability, achieve high capacity, low production cost, and ensure uniformity and compactness

Active Publication Date: 2010-11-24
重庆锦添翼新能源科技有限公司 +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery containing nano-silicon or tin negative electrode composite material and its preparation method for the shortcomings of the existing lithium-ion battery silicon-carbon negative electrode material and its preparation method, which has the advantages of low production cost, energy saving and energy saving. It effectively solves the cycle instability of silicon (Si) or tin (Sn) in the process of lithium insertion and delithiation, significantly improves the high capacity and cycle stability of negative electrode materials, and is especially suitable for lithium-ion power for electric vehicles. Battery development requirements and other characteristics

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  • Nano-Si or nano-Sn containing composite cathode material for lithium ion battery and preparation method thereof

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Embodiment 1

[0039] A lithium-ion battery containing nano-silicon or tin composite negative electrode material and its weight percentages are:

[0040] Negative active material 90%

[0041]Nano silicon 5%

[0042] Polymer 5%

[0043] Wherein: the negative electrode active material is a natural graphite carbon material with an average particle size of 23 microns; the average particle size of the nano-silicon is 50 nm, and the purity is 99%; the high molecular polymer is a phenolic resin.

[0044] A kind of preparation method of lithium ion battery containing nano-silicon or tin negative electrode composite material, concrete method step is as follows:

[0045] (1) Prepare mixed solution

[0046] Firstly prepare materials according to the ratio of natural graphite negative electrode active material: nano silicon: phenolic resin macromolecular polymer mass ratio of 90: 5: 5, then mix natural graphite negative electrode active material with nano silicon and half weight of phenolic resin mac...

Embodiment 2

[0057] A lithium-ion battery containing nano-silicon or tin composite negative electrode material and its weight percentages are:

[0058] Negative active material 92%

[0059] Nano silicon 4%

[0060] Polymer 4%

[0061] Wherein: the negative electrode active material is an amorphous carbon material with an average particle size of 20 microns; the average particle size of the nano-silicon is 10 nm, and the purity is 99%; the high molecular polymer is coal tar pitch.

[0062] A kind of concrete steps of the preparation method of lithium-ion battery negative electrode material, with embodiment 1, wherein:

[0063] In the (1) step, the mass ratio of amorphous carbon negative electrode active material: nano-silicon: coal tar pitch polymer is 92: 4: 4, and the coal of amorphous carbon negative electrode active material, nano-silicon and half weight The tar pitch high molecular polymer is added in the toluene solvent, and after stirring evenly, a mixed solution with a concentrat...

Embodiment 3

[0068] A lithium-ion battery containing nano-silicon or tin composite negative electrode material and its weight percentages are:

[0069] Negative active material 92%

[0070] Nano silicon 4%

[0071] Polymer 4%

[0072] Wherein: the negative electrode active material is SiO 2 The silicon-based oxide has an average particle diameter of 10 microns; the average particle diameter of the nano-silicon is 60nm, and the purity is 99%; the high molecular polymer is a phenolic resin.

[0073] A kind of concrete steps of the preparation method of lithium-ion battery negative electrode material, with embodiment 1, wherein:

[0074] In step (1), SiO 2 The mass ratio of negative electrode active material: nano-silicon: phenolic resin polymer is 92:4:4, and SiO 2 Negative electrode active material, nano-silicon and half weight of phenolic resin high molecular polymer are added in the acetone solvent, and after stirring evenly, a mixed solution with a concentration of 5g / ml is made;

...

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Abstract

The invention belongs to the technical field of nano-materials and chemical power sources and particularly provides a nano-Si or nano-Sn containing composite cathode material for a lithium ion battery and a preparation method thereof. The composite cathode material of the invention comprises the following components: cathode active substances, nano-Si or nano-Sn, and macromolecule polymers. The method taking the above components as raw materials comprises the following steps: firstly, preparing mixed solution; then, removing organic solvent; further coating the mixed solution with the macromolecule polymers; then, removing organic solvent; and finally, carrying out carbonization treatment to obtain the finished product. The invention has the advantages of fewer components, low cost, simple process and low energy consumption; and the composite cathode material prepared by the method of the invention has a core-shell structure and has the characteristics of high capacity, high stability and high capability of rapidly charging and discharging. Therefore, the composite cathode material of the invention is widely applicable to lithium ion batteries, super-capacitors and other components based on new energy resources and particularly applicable to lithium ion batteries for electric vehicles.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and chemical power sources, and in particular relates to a composite negative electrode material containing nanometer silicon or tin for a lithium ion battery and a preparation method thereof. Background technique [0002] According to market forecasts in Japan, the United States and Europe, lithium-ion battery packs will be the main vehicle batteries after 2010. According to the development requirements of lithium-ion power batteries, negative electrode materials are objectively required to have high capacity, fast rate charge and discharge, high thermal stability and Features such as low cost. At present, the anode materials that are more practically used are carbon materials, such as natural graphite, graphitized mesocarbon microspheres (MCMB), etc., among which the theoretical capacity of graphite anode materials is 372mAh / g, and the actual capacity is between 320-350mAh / g. , limi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 李新禄宋宏芳王皓杜坤张育新黄佳木
Owner 重庆锦添翼新能源科技有限公司
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