Mesoporous carbon/silicon composite anode material and preparation method thereof

A negative electrode material and composite material technology, applied in the field of lithium-ion battery carbon-silicon composite negative electrode materials and its preparation, can solve the problems of not taking into account capacity and cycle performance, and products and performance that do not meet industrial practical applications, and achieve excellent cycle performance, increase capacity, and avoid volume change effects

Inactive Publication Date: 2013-01-09
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the above-mentioned methods can achieve the purpose of improving performance from a certain angle, they cannot take both capacity and cycle performance into consideration, and none of them have obtained products and performances that meet industrial practical applications.

Method used

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  • Mesoporous carbon/silicon composite anode material and preparation method thereof
  • Mesoporous carbon/silicon composite anode material and preparation method thereof
  • Mesoporous carbon/silicon composite anode material and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0040] The preparation method of polyamic acid solution (PAA solution) is as follows:

[0041] Under the protection of an inert gas, after dissolving the diamine monomer in the solvent, slowly add the dianhydride monomer, react at 10-35° C. for 12-24 hours after the addition, and obtain a polyamic acid solution.

[0042] Monomers used: pyromellitic dianhydride (PMDA): Sinopharm Chemical Reagent Co., Ltd.; 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA): SIGMA-ALDRICH China Co., Ltd.; 4 , 4'-diaminodiphenyl ether (ODA): Sinopharm Chemical Reagent Co., Ltd.; p-phenylenediamine (p-PDA): Sinopharm Chemical Reagent Co., Ltd.

[0043] Solvents used: N-methylpyrrolidone (NMP): Sinopharm Chemical Reagent Co., Ltd.; N, N-dimethylformamide (DMF): Sinopharm Chemical Reagent Co., Ltd.

[0044] The preparation method that contains phenolic resin precursor solution (PF solution) is as follows:

[0045] Melt phenol, then add sodium hydroxide solution and stir evenly; add formaldeh...

Embodiment 1

[0056] Synthesis of polymer precursors:

[0057] Under the protection of nitrogen, after dissolving 397.52g ODA in 5800ml DMF, slowly add 652.48gBTDA, after the addition, react at 15°C for 20 hours to obtain a polyamic acid solution (PAA solution) with a solid content of 0.18g / ml.

[0058] Preparation of mesoporous carbon / silicon composite anode materials:

[0059] 1) Disperse 300g of F127 evenly in a mixed solution formed by 150g of 0.1M hydrochloric acid and 1600g of tetrahydrofuran, add 416g of tetraethyl orthosilicate, and stir for 2 hours at 40°C with a magnetic stirrer to obtain solution 1;

[0060] 2) Mix the solution 1 obtained in step 1) with 500g of PAA solution, and continue to react at 45°C for 3 hours to prepare a composite sol;

[0061] 3) Put the composite sol in a container, volatilize at room temperature for 50 hours, and then heat-treat at 100°C for 10 hours to obtain F127 / polymer / silica composite material;

[0062] 4) Place the F127 / polymer / silica composit...

Embodiment 2

[0067] Synthesis of polymer precursors:

[0068] Under the protection of nitrogen, after dissolving 551.8gp-PDA in 8000ml NMP, slowly add 1051.7gPMDA, after the addition, react at 10°C for 24 hours to obtain a polyamic acid solution (PAA solution) with a solid content of 0.20g / ml.

[0069] Preparation of mesoporous carbon / silicon composite anode materials:

[0070] 1) Evenly disperse 150g of F127 in a mixed solution formed by 180g of 0.1M hydrochloric acid and 2000g of toluene, add 660g of tetraethylorthosilicate, and stir for 5 hours at 20°C with a magnetic stirrer to obtain solution 2;

[0071] 2) Mix the solution 2 obtained in step 1) with 400g of PAA solution, and continue to react at 30°C for 1 hour to prepare a composite sol;

[0072] 3) The composite sol was placed in a container, volatilized at room temperature for 240 hours, and then heat-treated at 200°C for 2 hours to obtain F127 / polymer / silica composite material;

[0073] 4) Place the F127 / polymer / silica composit...

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Abstract

The invention discloses a novel mesoporous carbon / silicon composite anode material and a preparation method thereof. The mesoporous carbon / silicon composite anode material is provided with a mesoporous structure, the molar ratio of carbon to silicon in the composite material ranges from 1:99-99:1, and the silicon is one or more of Si or SiOx (0<x<2). The carbon and the silicon in the material are horizontally compounded, ultrahigh theoretical capacity of the silicon is effectively used, and huge volume change of silicon atoms in repeated charge-discharge process is avoided. The capacity of the anode material is increased, and the cycle performance is importantly improved. The material can be used as an electrode material with high capacity and excellent cycle performance for a lithium ion secondary battery, and development of an electric vehicle can be promoted.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a carbon-silicon composite negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Secondary batteries are a new generation of batteries since the 1990s after nickel-metal hydride batteries, represented by lithium-ion batteries, because of their high operating voltage, high energy density, long cycle life, small self-discharge, and no memory effect And other advantages, it has become the preferred chemical power source for high-end electronic consumer products, and has penetrated into aerospace, military and other cutting-edge technology fields. Due to the rapid development and wide application of various portable electronic devices and electric vehicles, the demand for lithium-ion batteries with higher energy and longer cycle life is more urgent. At present, the negative electrode material use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCY02E60/12Y02E60/10
Inventor 杨扬赵超越陈桥吴刚
Owner TORAY FIBER RES INST(CHINA) CO LTD
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