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Method for preparing high-performance silicon-carbon negative electrode composite material of lithium ion battery

A technology of lithium-ion batteries and composite materials, which is applied in the field of preparation of silicon-carbon negative electrode composite materials, can solve the problems of not meeting the needs of industrialization, complicated preparation process, uncontrollable, etc. the effect of

Inactive Publication Date: 2019-05-10
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Although the above-mentioned method structure has improved new ideas for silicon-carbon composites, these methods have difficulties in actual operation, and the preparation process is complicated and uncontrollable, which cannot meet the needs of industrialization

Method used

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  • Method for preparing high-performance silicon-carbon negative electrode composite material of lithium ion battery
  • Method for preparing high-performance silicon-carbon negative electrode composite material of lithium ion battery
  • Method for preparing high-performance silicon-carbon negative electrode composite material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First, a high-quality nano-silicon is prepared by thermal plasma method. 2kg of silicon powder with a particle size of 25μm is gradually fed into the powder feeder, and then the working gas argon is passed into the plasma reaction equipment as a carrier. The flow rate of the gas is 0.5m 3 h -1 , the flow rate of argon as side gas is 5.0m 3 h -1 , the flow rate of the central gas argon is 68m 3 h -1 . Turn on the powder feeder, output the silicon powder at a speed of 2g / min, and transport it to the high temperature zone sent to the reaction center through the carrier gas (argon gas), waiting for the silicon powder to be vaporized or decomposed into gas. Then its gaseous state is sent to the low temperature zone through the central gas (argon gas), at 10m 3 / h Rapid cooling, gaseous atoms nucleate and grow at a suitable temperature to form high-quality nano-silicon spheres, which are collected for use.

[0038] Select 1kg of high-quality sucrose material and put it...

Embodiment 2

[0041] First, a high-quality nano-silicon is prepared by thermal plasma method. 2kg of silicon powder with a particle size of 25μm is gradually fed into the powder feeder, and then the working gas argon is passed into the plasma reaction equipment as a carrier. The flow rate of the gas is 0.5m 3 h -1 , the flow rate of argon as side gas is 5.0m 3 h -1 , the flow rate of the central gas argon is 68m 3 h -1 . Turn on the powder feeder, output the silicon powder at a speed of 2g / min, and transport it to the high temperature zone sent to the reaction center through the carrier gas (argon gas), waiting for the silicon powder to be vaporized or decomposed into gas. Then its gaseous state is sent to the low temperature zone through the central gas (argon gas), at 10m 3 / h Rapid cooling, gaseous atoms nucleate and grow at a suitable temperature to form high-quality nano-silicon spheres, which are collected for use.

[0042] Select 1kg of high-quality sucrose material and put it...

Embodiment 3

[0045] First, a high-quality nano-silicon is prepared by thermal plasma method. 2kg of silicon powder with a particle size of 25μm is gradually fed into the powder feeder, and then the working gas argon is passed into the plasma reaction equipment as a carrier. The flow rate of the gas is 0.5m 3 h -1 , the flow rate of argon as side gas is 5.0m 3 h -1 , the flow rate of the central gas argon is 68m 3 h -1 . Turn on the powder feeder, output the silicon powder at a speed of 2g / min, and transport it to the high temperature zone sent to the reaction center through the carrier gas (argon gas), waiting for the silicon powder to be vaporized or decomposed into gas. Then its gaseous state is sent to the low temperature zone through the central gas (argon gas), at 10m 3 / h Rapid cooling, gaseous atoms nucleate and grow at a suitable temperature to form high-quality nano-silicon spheres, which are collected for use.

[0046] Select 1kg of high-quality sucrose material and put it...

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Abstract

The invention discloses a method for preparing a high-performance silicon-carbon negative electrode composite material of a lithium ion battery, and belongs to the technical field of negative electrodes of the lithium ion batteries. The method comprises the following steps of (1) selecting micron silicon powder as a raw material to prepare nano silicon powder; (2) carrying out high-temperature annealing on carbohydrates under the protection of inert gas to obtain an amorphous carbon material; (3) mixing the nano silicon powder obtained in the step (1) with the amorphous carbon material obtained in the step (2) and then adding into a ball mill to carry out ball milling in order to obtain a binary precursor material; and (4) adding the binary precursor material obtained in the step (3) and graphite into the ball mill to be subjected to ball milling again in order to obtain the silicon-carbon negative electrode composite material. The silicon-carbon negative electrode composite material obtained by the invention has a ternary structure, the volume expansion of silicon particles is buffered, and the pulverization of the material in a lithium de-intercalation process is inhibited; and the specific capacity is improved through multiple compact coating layers, and the first coulombic efficiency and the cycling stability are improved.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and relates to a preparation method of a silicon carbon negative electrode composite material. Background technique [0002] In recent years, my country's energy demand has continued to grow rapidly, especially the massive consumption of oil resources, which not only has a serious impact on the ecological environment, but also brings potential risks to national energy security with the increasing dependence on oil. And the dual impact of national energy security, my country's energy development problems need to be solved urgently. With regard to the sustainable development of energy, with the rapid economic and social development, energy demand and consumption will maintain rapid growth. The total amount of resources and environmental capacity restrict the improvement of energy supply capacity, and the energy structure needs to be optimized urgently. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 王熙刘洋王慧琴杨一君袁方利
Owner BEIJING JIAOTONG UNIV
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