Lithium-ion battery anode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as cracking, pulverization, fading, and no special mention, so as to increase activity and capacity, improve cycle life, Excellent chemical stabilization effect
CN109698327BActive Publication Date: 2021-07-27SUPER ENERGY MATERIALS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SUPER ENERGY MATERIALS
Publication Date
2021-07-27

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Abstract

The invention provides a negative electrode material for a lithium ion battery. The negative electrode material has a silicon nitride structure mainly composed of β-phase silicon nitride, and the silicon nitride contains more than 50 wt% of the β-phase silicon nitride. The β-phase silicon nitride has a layered hexagonal crystal structure. Because of its layered characteristics, it facilitates the insertion and extraction of lithium ions, reduces the lithium dendrite (Lithium Dendrites) structure due to the inability to insert lithium ions smoothly, and Due to the stable structure and size during charging and discharging, it can greatly reduce the decline in capacitance caused by material breakage and disintegration, so as to improve the cycle life. The β-phase silicon nitride disclosed in the present invention has a chemical formula of β-Si3Nx, where 1≦x≦4, and due to the low nitrogen atomic weight percentage, the β-phase silicon nitride (β-Si3Nx) has unstable dangling bonds , unsaturated bonds and other unpaired bonds can improve the activity and capacitance of negative electrode materials.
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Description

technical field

[0001] The invention provides a lithium ion battery negative electrode material, in particular to a β-phase silicon nitride lithium ion battery negative electrode material including unsaturated bonds. Background technique

[0002] Lithium-ion batteries have been widely used in electronic products, but with the development of science and technology, they can no longer meet the needs of high-capacity batteries. Silicon-based negative electrode materials have high capacitance characteristics, up to 4200mAh / g, which is the negative electrode material with the highest capacity today. , but there are shortcomings of the negative electrode material being broken and pulverized after intercalation and intercalation of lithium ions. In order to solve the above problems, many studies have modified and modified silicon-based materials in terms of composition and structure. Among them, the modification of the composition is that silicon and one or more non-silicon atoms a...

Claims

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