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Preparation method of porous spherical silicon-based composite negative electrode material

A negative electrode material, porous spherical technology, applied in the field of preparation of porous spherical silicon-based composite negative electrode materials, can solve the problems of reduced material tap density, reduced theoretical capacity of composite materials, etc., to improve conductivity, improve electrochemical performance, change The effect of tightness

Active Publication Date: 2020-02-07
HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the introduction of carbon plays an important role in improving the rate performance and cycle stability of the material, too high carbon content will lead to a decrease in the theoretical capacity of the composite material and a decrease in the tap density of the material.

Method used

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  • Preparation method of porous spherical silicon-based composite negative electrode material
  • Preparation method of porous spherical silicon-based composite negative electrode material
  • Preparation method of porous spherical silicon-based composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare 2 mol / L NiCl 2Aqueous solution, take 200ml of the solution into the reaction bottle, add 3g of glucose, stir to dissolve, then take 14g of aluminum-silicon alloy powder with a silicon content of 20%, add it to the reaction bottle, and pass high-purity gaseous tetrachloride tetrachloride under continuous stirring conditions For silicon, the gas flow rate is controlled at 0.01mol / min, and the ventilation time is 50 minutes. Silicon tetrachloride is hydrolyzed in water to generate HCl and SiO 2 , with the increase of the amount of silicon tetrachloride, a large amount of HCl is generated to gradually dissolve and remove the aluminum in the aluminum-silicon alloy to obtain a porous silicon skeleton, and at the same time, the generated SiO 2 Deposition coating on the surface of porous silicon skeleton to form Si / SiO 2 matrix; add ammonia water dropwise to the above mixture, adjust the pH to 7~8, continue to stir for 10 minutes, then transfer it to a polytetrafluoroe...

Embodiment 2

[0036] Configure 1mol / L FeCl 3 Aqueous solution, take 200ml of the solution into the reaction bottle, add 2.85g of sucrose, stir to dissolve, then take 28g of iron-silicon alloy powder with a silicon content of 30%, add it to the reaction bottle, and feed high-purity gaseous tetrachloride under continuous stirring conditions SiO, the gas flow rate is controlled at 0.02mol / min, the ventilation time is 60 minutes, and silicon tetrachloride is hydrolyzed to generate HCl and SiO 2 , with the increase of the amount of silicon tetrachloride introduced, a large amount of HCl is generated to gradually dissolve and remove the iron in the iron-silicon alloy to obtain a porous silicon skeleton, and at the same time the generated SiO 2 Deposition coating on the surface of porous silicon skeleton to form Si / SiO 2 Matrix; add ammonia water dropwise to the above mixture, adjust the pH to 7~8, continue stirring for 10 minutes, then transfer it to a polytetrafluoroethylene-lined autoclave, ke...

Embodiment 3

[0039] Configure 0.5mol / L TiCl 4 Aqueous solution, take 200ml of the solution into the reaction bottle, add 3.2g of citric acid, stir to dissolve, then take 47g of silicon-magnesium alloy powder with a silicon content of 30%, add it to the reaction bottle, and introduce high-purity gaseous tetrachloride under continuous stirring conditions. Silicon chloride, the gas flow rate is controlled at 0.05mol / min, and the ventilation time is 10 minutes. Silicon tetrachloride is hydrolyzed to generate HCl and SiO 2 , with the increase of the amount of silicon tetrachloride, a large amount of HCl is generated to gradually dissolve and remove the magnesium in the magnesium-silicon alloy to obtain a porous silicon skeleton, and the SiO produced at the same time 2 Deposition coating on the surface of porous silicon skeleton to form Si / SiO 2 Matrix; add ammonia water dropwise to the above mixture, adjust the pH to 7~8, continue stirring for 10 minutes, then transfer it to a polytetrafluoroe...

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Abstract

The invention discloses a preparation method of a porous spherical silicon-based composite negative electrode material. The method comprises steps of (1) introducing a certain amount of high-purity gaseous silicon tetrachloride into mixed solution A containing metal salt, carbon source precursor and metal-based silicon alloy, hydrolyzing silicon tetrachloride to generate hydrogen chloride and silicon dioxide, under the condition of continuous stirring, dissolving and removing the metal in the metal-based silicon alloy by hydrogen chloride to obtain a porous silicon skeleton matrix, depositingsilicon dioxide generated by hydrolyzing silicon tetrachloride to coat on the porous silicon skeleton, then carrying out hydrothermal reaction to obtain silicon / silicon dioxide particles B which aredoped with metal ions in situ and coated with the carbon source precursor; and (2) carrying out high-temperature treatment of the material B in a protective atmosphere to obtain a lithium ion batterysilicon-based composite negative electrode material with high specific capacity, good cycle performance and excellent rate capability. The method is advantaged in that the method is simple, and the prepared silicon-based composite negative electrode material is good in dispersity, uniform in surface coating, high in specific capacity and good in cycle performance.

Description

technical field [0001] The invention relates to a method for preparing a porous spherical silicon-based composite negative electrode material, which belongs to the technical field of new energy and new materials. Background technique [0002] Due to the advantages of high energy density and long cycle life, lithium-ion batteries are currently the most concerned energy storage devices, and have been widely used as power sources for electric vehicles and hybrid vehicles. The performance of the electrode material in the battery is the key to determine the energy density of the lithium-ion battery. Anode materials are an important part of lithium-ion batteries, and their performance directly affects the performance of lithium-ion batteries. However, the theoretical specific capacity of its commercial graphite anode of 372mAh / g is far from meeting the requirements of high energy density anode materials for power batteries. Therefore, it is of great practical significance to deve...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525C01B33/02C01B33/18C01B32/05
CPCC01B32/05C01B33/02C01B33/18C01P2004/03C01P2004/80C01P2006/40H01M4/366H01M4/386H01M4/483H01M4/625H01M4/626H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘湘李荐申昆
Owner HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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