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Preparation method of silicon-based composite material for lithium ion power battery

A technology of silicon-based composite materials and power batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., to prevent pulverization, avoid high economic costs, and solve the effects of dispersion and stability

Active Publication Date: 2019-05-14
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compounding with carbon matrix needs to solve the dispersion and stability of silicon materials in the matrix, and also needs to consider the economic cost of preparing composite materials

Method used

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  • Preparation method of silicon-based composite material for lithium ion power battery
  • Preparation method of silicon-based composite material for lithium ion power battery
  • Preparation method of silicon-based composite material for lithium ion power battery

Examples

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Effect test

Embodiment 1

[0043] A kind of preparation method of silicon-based composite material for lithium-ion power battery of the present invention, technological process is figure 1 , including the following steps:

[0044] (1) After mixing 1g nano-silicon, 50g plastics (polypropylene, PP), 0.56g nickel chloride and 5g montmorillonite by mechanical grinding, place them in a twin-screw extruder to control the melting conditions, Control the screw speed of the extruder to 30rpm and stir for 6h, control the processing temperature of the extruder to 220°C, extrude and granulate, cool to room temperature and take it out to obtain a nano-silicon / plastic / montmorillonite composite material;

[0045] (2) Dissolve 1.5ml of Triton X2100 and 1.5g of hexadecyltrimethylquaternary ammonium bromide in 100ml of 1mol / L hydrochloric acid solution until all the surfactants are dissolved and the solution becomes clear, then add 0.1mol of nano Silicon / plastic / montmorillonite composite material, control the molar rati...

Embodiment 2

[0050] A method for preparing a silicon-based composite material for a lithium-ion power battery of the present invention comprises the following steps:

[0051] (1) After mixing 1g nano-silicon, 10g plastic (polypropylene, PP), 0.13g nickel sulfate and 2g montmorillonite by mechanical grinding, place them in a twin-screw extruder, control the melting conditions, and control The screw speed of the extruder was 100rpm and stirred for 10h, the processing temperature of the extruder was controlled to be 270°C, extruded and granulated, cooled to room temperature and taken out to obtain a nano-silicon / plastic / montmorillonite composite material;

[0052] (2) Dissolve 1ml of OP-10 and 1g of trialkylammonium chloride in 200ml of 5mol / L hydrochloric acid solution until all the surfactants are dissolved and the solution becomes clear, then add 0.1mol of nano-silicon / plastic / montane under stirring Remove the soil composite material, control the molar ratio of n(HCl) / n(nano-silicon / plasti...

Embodiment 3

[0057] A method for preparing a silicon-based composite material for a lithium-ion power battery of the present invention comprises the following steps:

[0058] (1) After mixing 1g nano-silicon, 25g plastic (polypropylene, PP), 0.29g nickel acetate and 3g montmorillonite by mechanical grinding, place them in a twin-screw extruder, control the melting conditions, and control The screw speed of the extruder was 50 rpm and stirred for 8 hours, the processing temperature of the extruder was controlled to be 250° C., extruded and granulated, cooled to room temperature and taken out to obtain a nano-silicon / plastic / montmorillonite composite material;

[0059] (2) Dissolve 2ml of NP-8.6 and 2g of trialkylmethylammonium chloride in 200ml of 3mol / L hydrochloric acid solution until all surfactants are dissolved and the solution becomes clear, then add 0.15mol of nano silicon / plastic under stirring / montmorillonite composite material, control the molar ratio of n(HCl) / n(nano-silicon / pla...

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Abstract

The invention discloses a preparation method of a silicon-based composite material for a lithium ion power battery, belonging to the field of negative electrode materials for lithium ion batteries. The method comprises the steps of mixing the raw materials for extrusion and granulation under molten conditions by using nano silicon, plastic and montmorillonite as raw materials and adding heavy metal salt as a catalyst to obtain a nano-silicon / plastic / montmorillonite composite material; adding a nonionic surfactant and a cationic surfactant to the hydrochloric acid solution to obtain a mixed solution, adding the nano-silicon / plastic / montmorillonite composite material to the mixed solution to carry out a sol-gel reaction to obtain a nano-silicon / plastic / silica composite material; and obtaining the silicon-based composite material by subjecting the nano-silicon / plastic / silica composite material to carbothermal reduction. The preparation method provided by the invention, by utilizing the characteristics of inducing catalytic plastics and catalytic graphitization in heavy metal salts, realizes low temperature graphitization and graphitized carbon uniformly coating nano silicon particlesby using plastic as a carbon source, thereby improving electrochemical performance of silicon anode materials.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, and relates to a preparation method of a silicon-based composite material for lithium-ion power batteries. Background technique [0002] As one of the most promising electrochemical energy storage and transmission systems, lithium-ion batteries have been widely used in portable electronic devices as well as in the fields of electric vehicles and aviation, and the performance of anode materials is the key factor affecting the life, capacity, safety, etc. of lithium-ion batteries One of the main factors of performance. Today, the most widely used Li-ion anode is graphite material, but its theoretical capacity is only 372mA h g -1 , it is difficult to meet the further development of Li-ion batteries, therefore, exploring alternative anode materials with higher capacity and good cycle stability is very necessary for the development of high power density of Li-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 周昊宸周向清周进辉王鹏
Owner 湖南宸宇富基新能源科技有限公司
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