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Three-dimensional porous silicon-based composite negative electrode material of lithium ion cell and preparation method thereof

A lithium-ion battery, three-dimensional porous technology, applied in the direction of battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve the problems of unsatisfactory cycle performance and commercial application, and improve high-rate charge and discharge performance, Improved charge-discharge cycle performance and good electrical conductivity

Active Publication Date: 2012-09-19
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the disadvantages of the battery prepared by the existing silicon negative electrode, such as unsatisfactory discharge specific capacity, initial charge and discharge efficiency, and unsatisfactory cycle performance, and cannot be commercially applied to lithium-ion batteries; provide a low-cost, capable Three-dimensional porous silicon-based composite anode material for commercial application in lithium-ion batteries and its preparation method

Method used

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  • Three-dimensional porous silicon-based composite negative electrode material of lithium ion cell and preparation method thereof
  • Three-dimensional porous silicon-based composite negative electrode material of lithium ion cell and preparation method thereof
  • Three-dimensional porous silicon-based composite negative electrode material of lithium ion cell and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Clean the copper foil mesh or copper wire mesh or foamed copper or foamed nickel with an average pore size of 150 μm and a thickness of 700 μm with acetone, 10% dilute hydrochloric acid, distilled water and absolute ethanol in order to remove impurities such as surface oil and surface oxides . Elemental Si powder (purity is 99.5%, D 50 = 1.5 μm) and carboxymethylcellulose (CMC) were added into water at a mass ratio of 36:1, and stirred thoroughly to obtain a slurry (solid content: 35%). Immerse the copper foil mesh or copper wire mesh or foamed copper or foamed nickel current collector in the slurry, after fully impregnating and lightly scraping off the excess slurry on the surface, a copper foil mesh or copper wire mesh or copper wire mesh impregnated with slurry is formed. Foamed copper or foamed nickel current collector system, then make the copper foil mesh or copper wire mesh or foamed copper or foamed nickel current collector system impregnated with slurry vacuum...

Embodiment 2

[0048] Clean the copper foil mesh or copper wire mesh or foamed copper or foamed nickel with an average pore size of 100 μm and a thickness of 1000 μm with acetone, 10% dilute hydrochloric acid, distilled water and absolute ethanol in order to remove impurities such as surface oil and surface oxides . Elemental Si powder (purity is 99.9%, D 50 =100nm) and polyamide-imide (PAI) were added into N-methylpyrrolidone at a mass ratio of 45:1, and stirred thoroughly to obtain a slurry (solid content: 30%). Immerse the copper foil mesh or copper wire mesh or foamed copper or foamed nickel current collector in the slurry, after fully impregnating and lightly scraping off the excess slurry on the surface, a copper foil mesh or copper wire mesh or copper wire mesh impregnated with slurry is formed. Foamed copper or foamed nickel current collector system, followed by vacuum-drying the copper foil mesh or copper wire mesh or foamed copper or foamed nickel current collector system impregna...

Embodiment 3

[0051] Clean the copper foil mesh or copper wire mesh or foamed copper or foamed nickel with an average pore size of 100 μm and a thickness of 400 μm with acetone, 10% dilute hydrochloric acid, distilled water and absolute ethanol in order to remove impurities such as surface oil and surface oxides . Si-Sn mixed powder (Si purity 99.8%, D 50 =1.5μm; Sn purity is 99.6%, D 50 =100nm; and Si:Sn=1:1) and polyacrylic acid [poly(acrylic acid)] were added in the ethanol aqueous solution according to the mass ratio of 36:1, fully stirred to prepare slurry (solid content: 32%). Immerse the copper foil mesh or copper wire mesh or foamed copper or foamed nickel current collector in the slurry, after fully impregnating and lightly scraping off the excess slurry on the surface, a copper foil mesh or copper wire mesh or copper wire mesh impregnated with slurry is formed. The copper foam or nickel foam current collector system, followed by vacuum drying the copper foil mesh or copper wire ...

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Abstract

The invention discloses a three-dimensional porous silicon-based composite negative electrode material of a lithium ion cell and a preparation method thereof. A collection body material, such as a copper foil net or a copper wire net or foam copper or foam nickel, which has a three-dimensional net structure, enables electrode active substances to be uniformly dispersed in the material and the surface of the material, and has high temperature resistant characteristic and excellent conductivity, is adopted; and a sizing material containing simple substance silicon or a mixture of simple substance silicon and metal M is combined with the copper foil net or copper wire net or foam copper or foam nickel by a dipping method, and then the three-dimensional porous silicon-based composite negative electrode material is formed by a heat treatment (alloying and annealing treatment) manner. According to the invention, based on the three-dimensional porous structure, the forming of silicon metal alloy as well as excellent binding force between the negative electrode material and the three-dimensional porous collection body material, the cell prepared from the porous silicon-based composite negative electrode material has higher discharge specific capacity and first charge-discharge efficiency and excellent cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrode materials, in particular to a lithium-ion battery porous silicon-based composite negative electrode material and a preparation method thereof. Background technique [0002] In the research field of lithium-ion batteries, the research focus is on negative electrode materials. An ideal anode material should meet the following conditions: ① good charge-discharge reversibility and cycle life; ② small irreversible capacity for the first time; ③ good compatibility with electrolyte solvent; ④ high specific capacity; Pollution; ⑥ Abundant resources, low prices, etc. It is difficult for the existing negative electrode materials to meet the above requirements at the same time. At present, the commercial negative electrode materials of lithium-ion batteries are mainly carbon materials (including graphite, hard carbon and soft carbon, etc.), and the volume expansion during the lithium i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/66
CPCY02E60/12Y02E60/122H01M4/808H01M4/661H01M4/1395H01M4/386H01M4/134H01M10/0525Y02E60/10
Inventor 刘萍乔永民李辉吴敏昌丁晓阳谢秋生郑俊军
Owner SHANGHAI SHANSHAN TECH CO LTD
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