Anode material for lithium battery and lithium battery

A negative electrode material, lithium battery technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem of low coulombic efficiency in the first week
CN110690430AActive Publication Date: 2020-01-14LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
Publication Date
2020-01-14

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Abstract

The embodiment of the invention relates to an anode electrode material for a lithium battery and a lithium battery. The anode material is a silicon-carbon composite material with a core-shell structure, wherein the inner core of the anode material is carbon particles, a first coating layer is a coating layer composed of silylene oxide or a composite material of silylene and a buffer material, anda second coating layer is a dot-shaped coated carbon particle layer or a continuously coated carbon coating layer; the mass ratio of the carbon particles of the inner core to the anode material is (0,95%); the mass ratio of the first coating layer to the anode material is [10%, 95%]; the mass ratio of the second coating layer to the anode material is [0, 10%]; in the Raman spectrum of the anode material, the anode material has amorphous bumps at 475+ / -10 cm-1, and / or has crystalline peaks at 510+ / -10 cm-1; and the anode material has characteristic peaks of carbon exist at 1360+ / -20 cm-1 and 1580+ / -20 cm-1.
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Description

technical field

[0001] The invention relates to the technical field of batteries, in particular to a lithium battery negative electrode material and the lithium battery. Background technique

[0002] Carbon-based negative electrode materials have the advantages of good thermal stability, high equilibrium potential, and high first-week Coulombic efficiency. However, the theoretical capacity of carbon-based negative electrode materials is only 372mAh / g, and the application of carbon-based negative electrode materials in lithium-ion batteries is limited. Certain restrictions.

[0003] As the anode material of lithium-ion batteries, silicon has a theoretical reversible capacity of up to 4200mAh / g. However, due to the huge volume effect of silicon materials in the process of deintercalating lithium, the electrode material structure collapses and the solid electrolyte interface (SEI) film is unstable. The battery cycle is greatly reduced. In order to improve silicon-based anode ...

Claims

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