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Negative electrode material with multiple coating structures as well as preparation method and application of negative electrode material

A negative electrode material and coating structure technology, which is applied to negative electrode materials with multiple coating structures, in the field of preparation thereof, can solve the problem that it is difficult to uniformly cover the surface of silicon oxide, and cannot effectively improve the interface stability of the material, the ionic conductivity and the interface phase. There is no obvious improvement in capacitance, etc., to achieve the effect of improving interface strength and ionic conductivity, improving cycle stability, improving binder failure and slurry bubbling problems

Active Publication Date: 2020-04-10
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The silicon oxide coating process in the prior art mainly refers to the carbon coating process in artificial graphite processing (using pitch softening and carbonization), which makes it difficult for a single pitch carbon coating layer to evenly cover the surface of silicon oxide. The interfacial stability of the material cannot be effectively improved; at the same time, the introduction of pure carbon materials does not significantly improve the ionic conductivity of the material itself and the interfacial compatibility between the material and the electrolyte. Negative electrode material with clad structure, its preparation method and use

Method used

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  • Negative electrode material with multiple coating structures as well as preparation method and application of negative electrode material
  • Negative electrode material with multiple coating structures as well as preparation method and application of negative electrode material
  • Negative electrode material with multiple coating structures as well as preparation method and application of negative electrode material

Examples

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Effect test

Embodiment 1

[0064] (1) Heat treatment of 4 μm silicon oxide precursor SiO and lithium hydride at a temperature of 800° C. for 4 hours to obtain lithium-containing silicon oxide with a content of lithium element of 8 wt %;

[0065] (2) Take 10 g of the lithium-containing silicon oxide powder, feed argon (Ar) at a flow rate of 100 sccm / min in a tubular atmosphere furnace, heat up to 300 °C at a rate of 5 °C / min and keep warm at a flow rate of 50 sccm / min flow into carbon dioxide (CO 2 ) gas, after the reaction continued for 20min, the carbon dioxide (CO 2 ) gas to obtain lithium-containing silicon oxide with a lithium salt (lithium carbonate) coating layer;

[0066] (3) Continue to feed argon (Ar), and raise the temperature to 920°C at a rate of 5°C / min, and feed acetylene (C 2 h 2 ) gas, the reaction time continued for 1h, and the acetylene gas was turned off (C 2 h 2 ), continue to feed argon (Ar) to react for 1h, turn off the heating, naturally cool down to room temperature, and tak...

Embodiment 2

[0069] The difference with Example 1 is that the content of lithium element in step (1) lithium-containing silicon oxide is 5wt%, and step (2) controls sulfur dioxide (SO 2 ) gas flow rate is 30 sccm / min, so that in the obtained negative electrode material with multiple coating structure, the content of the lithium sulfate coating layer is 0.1 wt%.

Embodiment 3

[0071] The difference with Example 1 is that the content of lithium element in step (1) lithium-containing silicon oxide is 6.5wt%, and step (2) controls carbon dioxide (CO 2 ) The flow rate of the gas is 30 sccm / min, so that in the obtained negative electrode material with multiple coating structure, the content of the lithium carbonate coating layer is 10wt%.

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Abstract

The invention relates to a negative electrode material with a multi-coating structure as well as a preparation method and application of the negative electrode material. The negative electrode material with the multiple coating structures comprises lithium-containing silicon monoxide as well as a lithium salt coating layer, a carbon coating layer and a polymer coating layer which sequentially coatthe surface of the silicon monoxide. The lithium salt coating layer of the negative electrode material effectively inhibits the volume expansion of the material, improves the ionic conductivity of the surface of the material, improves the cycling stability of an electrode, and reduces the alkalinity of the material; the carbon coating layer of the negative electrode material improves the electronic conductivity of the surface of the material and improves the oxidation-reduction reaction rate of the surface of the material; the polymer coating layer of the negative electrode material improvesthe compatibility between the silicon monoxide and the organic electrolyte, limits the volume expansion of the material to a certain extent, avoids the cracking of the material, and more effectively improves the cycling stability of the electrode.

Description

technical field [0001] The invention belongs to the fields of energy storage materials and electrochemistry, and in particular relates to a negative electrode material with multiple coating structures, its preparation method and application. Background technique [0002] The cruising range is currently the main factor limiting the large-scale application of pure electric vehicles, and increasing the energy density of power batteries is the most effective solution to this problem. Silicon materials, especially silicon oxide, are considered to be the primary choice for negative electrode materials in the chemical system of high energy density power batteries because of their high specific capacity (3 to 5 times that of graphite). However, the current mainstream silicon anode product--silicon oxide anode also has disadvantages such as low first Coulombic efficiency and poor cycle stability, which seriously restrict its large-scale commercial application. [0003] First of all,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/52H01M4/13H01M10/0525
CPCH01M4/62H01M4/625H01M4/523H01M4/13H01M10/0525Y02E60/10
Inventor 张传健唐文刘娇张浩江柯成于清江
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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