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Method for preparing lithium ion battery porous silicon composite cathode material by industrial silicon waste material

A technology of lithium ion battery and negative electrode material, applied in the field of electrochemistry, can solve the problems of complex process, generation of pollutants, expensive raw materials, etc., and achieve the effects of simple treatment method, reduced pollution and low price

Inactive Publication Date: 2014-06-18
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two issues to be considered in the preparation of composite materials with carbon: one is the way of adding carbon
However, the current methods for preparing porous silicon all have the disadvantages of expensive raw materials, complicated processes, and the generation of pollutants.

Method used

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  • Method for preparing lithium ion battery porous silicon composite cathode material by industrial silicon waste material
  • Method for preparing lithium ion battery porous silicon composite cathode material by industrial silicon waste material
  • Method for preparing lithium ion battery porous silicon composite cathode material by industrial silicon waste material

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Effect test

Embodiment 1

[0027] After the industrial silicon waste is pretreated and sorted by a 500-mesh sieve, the material is added to a 30% sucrose solution, and a stable suspension is obtained after thorough stirring. The suspension is spray-dried to obtain a sucrose-coated material. Then heat treatment at 700°C for 16 hours to obtain a silicon / copper / carbon composite material. Then mix it with acetylene black and polyvinylidene fluoride (PVDF) at a ratio of 8:1:1, add an appropriate amount of N-methylpyrrolidone (NMP), grind to a moderate viscosity, no graininess, and coat it on the copper foil. Bake in an oven at 50°C for 8 hours, and apply a pressure of 2 MPa with a hydraulic machine. Afterwards, they were dried in a vacuum oven at 120°C for 10 hours to form pole pieces and weighed. The thickness of the pole piece is 35~45μm. In the glove box, the lithium sheet is used as the negative electrode, the celgard2400 membrane is used as the diaphragm to assemble the battery, and the electrolyte is...

Embodiment 2

[0029] After the industrial silicon waste is pretreated and sorted by a 200-mesh sieve, the ball mill is milled at 100 rpm for 2 hours, 10% phenolic resin and appropriate amount of ethanol are added, fully stirred and spray-dried, and then heat treated at 800°C for 16 hours to obtain silicon / copper / carbon Composite materials. Then mix it with acetylene black and PVDF in a ratio of 8:1:1, add an appropriate amount of NMP, grind until the viscosity is moderate, without graininess, and coat it on the copper foil. Bake in an oven at 50°C for 8 hours, and apply a pressure of 2 MPa with a hydraulic machine. Afterwards, they were dried in a vacuum oven at 120°C for 10 hours to form pole pieces and weighed. The thickness of the pole piece is 35~45μm. In the glove box, the lithium sheet is used as the negative electrode, the celgard2400 membrane is used as the diaphragm to assemble the battery, the electrolyte is 1MLiPF 6 / EC+DMC. At 0.2mA / cm 2 Under charge and discharge, the reversi...

Embodiment 3

[0031] After the industrial silicon waste is pretreated and sorted by a 200-mesh sieve, 30% ascorbic acid is added, and after uniform grinding, it is heat-treated at 800° C. for 12 hours to obtain a silicon / copper / carbon composite material. Then mix it with acetylene black and PVDF at a ratio of 8:1:1, add an appropriate amount of NMP, grind until the viscosity is moderate, without graininess, and coat it on the copper foil. Bake in an oven at 50°C for 8 hours, and apply a pressure of 2 MPa with a hydraulic machine. Afterwards, they were dried in a vacuum oven at 120°C for 10 hours to form pole pieces and weighed. The thickness of the pole piece is 35~45μm. In the glove box, the lithium sheet is used as the negative electrode, the celgard2400 membrane is used as the diaphragm to assemble the battery, the electrolyte is 1MLiPF 6 / EC+DMC. At 0.2mA / cm 2 Under charge and discharge, the first reversible capacity of the material reaches 1600mAh / g.

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Abstract

The invention belongs to the electrochemistry field, and is in particular to reutilization of lithium ion battery cathode material and siliceous industrial waste material. Silane and trichlorosilane are important raw materials for preparing an organosilicon polymer and polysilicon, and the siliceous industrial waste material output generated during a production process is huge. Usually, the cooper (residual catalyst) in the waste material is recovered, which is imbedded as a soil. The industrial waste material is subjected to the processes of washing, sorting, pretreating, and then carbon cladding is carried out, the obtained porous silicon / carbon / copper composite material is taken as a cathode material of the lithium ion battery. In the material, silicon has abundant pore structure, its porous structure and the coated carbon layer can reduce the volume expansion and contraction of silicon during a lithiation process, copper and the coated carbon layer can increase the conductivity of a silicon-based cathode material, so that the specific capacity and cycle performance of the silicon-based cathode material are increased. The method for preparing the lithium ion battery porous silicon composite cathode material by the industrial silicon waste material can realize the reutilization of the industrial waste material, and provides a cheap and practical new approach for high specific capacity silicon cathode material of the lithium ion battery.

Description

Technical field [0001] The invention relates to the reuse of silicon-containing industrial waste produced in the preparation process of silane and trichlorosilane and the preparation of a porous silicon composite material. The obtained porous silicon composite material is suitable for lithium ion batteries or lithium-sulfur battery anode materials and belongs to the field of electrochemistry. Background technique [0002] Lithium-ion batteries are widely used due to their high specific energy, good cycle life, stable discharge voltage, wide operating temperature range, low self-discharge rate, long storage life, no memory effect and no pollution. With the increasing shortage of traditional fossil energy and the increasing pressure of environmental pollution, the development of green alternative energy has become a worldwide concern. Because of the above-mentioned advantages, lithium-ion batteries have great application prospects in the large-scale energy storage of new energy veh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/134H01M4/362H01M4/366H01M4/625H01M10/0525Y02E60/10
Inventor 杨裕生王维坤邱景义余仲宝李萌苑克国王安邦
Owner NO 63971 TROOPS PLA
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