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Negative electrode plate containing silicon-based negative electrode material with high initial Coulombic efficiency and lithium ion battery

A technology of silicon-based negative electrode material and Coulomb efficiency, applied in secondary batteries, negative electrodes, battery electrodes, etc., can solve the problems of reducing Si gram capacity, difficult to remove by-products, reducing negative electrode conductivity, etc., to achieve low raw material cost, Easy industrial application, low conductivity

Inactive Publication Date: 2021-09-07
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But using alloy powder to reduce SiO x Electrochemically inert Si-based compounds, such as Li 4 SiO 4 or Mg 2 SiO 4 , not only reduces the gram capacity of Si, but also the presence of these by-products that are difficult to remove will reduce the conductivity of the negative electrode

Method used

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  • Negative electrode plate containing silicon-based negative electrode material with high initial Coulombic efficiency and lithium ion battery
  • Negative electrode plate containing silicon-based negative electrode material with high initial Coulombic efficiency and lithium ion battery
  • Negative electrode plate containing silicon-based negative electrode material with high initial Coulombic efficiency and lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Carbon coating: SiO x Mix evenly with the carbon source, pass into the protective gas, carry out the vapor phase deposition reaction in the tube furnace, cool to room temperature after the reaction is completed, and obtain SiO with a carbon coating mass percentage of 5wt%. x / C material, coated with SiO x The reversible gram capacity of / C material is 1620mAh / g, where 0<x<2;

[0031] 2) Mixing: Take 200g of carbon-coated SiO x / C material, add 40g reducing agent LiAlH 4 , fully mixed evenly in the ball mill equipment;

[0032] 3) Pyrolysis: Put the uniformly mixed material into a tube furnace, feed nitrogen gas, the gas flow rate is 120mL / min, raise the temperature to 500°C at a rate of 5°C / min and keep it warm for 1 hour, continue feeding nitrogen gas, and calcining Naturally cool after reduction to obtain SiO y / C material, where 0<y<1;

[0033] 4) Water washing: soak the pyrolysis product in 80g of dilute hydrochloric acid for 30 minutes, wash with 400g of d...

Embodiment 2

[0038] 1) Carbon coating: SiO x Mix evenly with the carbon source, pass into the protective gas, carry out the vapor phase deposition reaction in the tube furnace, cool to room temperature after the reaction is completed, and obtain SiO with a carbon coating mass percentage of 5wt%. x / C material, coated with SiO x The reversible gram capacity of / C material is 1620mAh / g, where 0<x<2;

[0039] 2) Mixing: Take 200g of carbon-coated SiO x / C material, add 40g reducing agent LiAlH 4 , fully mixed evenly in the ball mill equipment;

[0040] 3) Pyrolysis: Put the uniformly mixed material into a tube furnace, feed nitrogen gas, the gas flow rate is 120mL / min, raise the temperature to 500°C at a rate of 5°C / min and keep it warm for 1 hour, continue feeding nitrogen gas, and calcining Naturally cool after reduction to obtain SiO y / C material, where 0<y<1;

[0041] 4) Water washing: soak the pyrolysis product in 80g of dilute hydrochloric acid for 30 minutes, wash with 400g of d...

Embodiment 3

[0046] 1) Carbon coating: SiO x Mix evenly with the carbon source, pass into the protective gas, carry out the vapor phase deposition reaction in the tube furnace, cool to room temperature after the reaction is completed, and obtain SiO with a carbon coating mass percentage of 5wt%. x / C material, coated with SiO x The reversible gram capacity of / C material is 1620mAh / g, where 0<x<2;

[0047] 2) Mixing: Take 200g of carbon-coated SiO x / C material, add 40g reducing agent LiAlH 4 , fully mixed evenly in the ball mill equipment;

[0048] 3) Pyrolysis: Put the uniformly mixed material into a tube furnace, feed nitrogen gas, the gas flow rate is 120mL / min, raise the temperature to 500°C at a rate of 5°C / min and keep it warm for 1 hour, continue feeding nitrogen gas, and calcining Naturally cool after reduction to obtain SiO y / C material, where 0<y<1;

[0049] 4) Water washing: soak the pyrolysis product in 80g of dilute hydrochloric acid for 30 minutes, wash with 400g of d...

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Abstract

The invention relates to the technical field of lithium batteries, and discloses a silicon-based negative electrode material with high initial Coulombic efficiency. The preparation process comprises the steps of 1, carbon coating; 2, mixing with LiAlH4; and 3, pyrolyzing, washing and drying to obtain a composite SiOy / C material, namely, the silicon-based negative electrode material with high initial Coulombic efficiency, wherein y is greater than 0 and less than 1. The invention also discloses a negative electrode plate containing the silicon-based negative electrode material with high initial Coulombic efficiency, the negative electrode plate comprises a copper foil, the surface of the copper foil is coated with negative electrode slurry, the negative electrode slurry comprises a negative electrode active substance, a conductive agent and a binder, and the negative electrode active substance is a composite SiOy / C material or a material mixed with graphite. The ratio of Si to O in the SiOx material can be controllably adjusted through the strong reducing agent LiAlH4, the first charge and discharge efficiency of the SiOx material is improved, the raw material cost is low, industrialization is easy to achieve, few electrochemical inert impurities are introduced, and the influence on the conductivity of the silicon-based material is small.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a negative electrode sheet containing a silicon-based negative electrode material with high first-time Coulombic efficiency and a lithium-ion battery. Background technique [0002] In lithium-ion battery anode materials, silicon-based materials are an ideal choice to replace graphite because of their theoretical capacity second only to metal lithium, lower lithium intercalation potential, and lower price. However, there is a serious volume effect problem after lithium intercalation in pure silicon materials, and the cycle life is far inferior to that of graphite materials, which hinders its commercial application. Silicon oxide (SiO x , 0<x<2, close to 1) Not only has a high specific capacity, but also the volume effect is much smaller than that of pure silicon, and has good stability and cycle life. At present, small-scale commercial applications have appear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/131H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M4/628H01M4/131H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 石先兴张小祝许梦清陈军
Owner WANXIANG 123 CO LTD
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