Anode material, electrochemical device and electronic device comprising the same
AssigneeNingde Amperex Technology Limited
InventorsDaoyi Jiang, Zhihuan Chen, Hang Cui, Yuansen Xie
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Abstract
An anode material includes a silicon composite substrate. In the X-ray diffraction pattern of the anode material, the highest intensity at 2θ within the range of 28.0° to 29.0° is I2, and the highest intensity at 2θ within the range of 20.5° to 21.5° is I1, wherein 0<I2/I1≤1. The anode material has good cycle performance, and the battery prepared with the anode material has better rate performance and a lower swelling rate.
Claims20
An anode material, comprising a silicon composite substrate, wherein in an X-ray diffraction pattern of the anode material, the highest intensity at 2θ within the range of 28.0° to 29.0° is I2, and the highest intensity at 2θ within the range of 20.5° to 21.5° is I1, wherein 0<I2/I1≤1.
A method for preparing an anode material, comprising:
- mixing silicon dioxide and a metal silicon powder at a molar ratio of 1:5 to 5:1 to obtain a mixed material;
- heating the mixed material at a temperature range of 1100 to 1550° C. under 10−4 to 10−1 kPa for 0.5 to 24 hr to obtain a gas;
- condensing the obtained gas to obtain a solid;
- crushing and screening the solid;
- and
- heat-treating the solid at a temperature range from 400° C. to 1200° C. for 1 to 24 hr, and cooling the heat-treated solid to obtain an anode active material.
An anode, comprising an anode material, the anode material comprises a silicon composite substrate, wherein in an X-ray diffraction pattern of the anode material, the highest intensity at 2θ within the range of 28.0° to 29.0° is I2, and the highest intensity at 2θ within the range of 20.5° to 21.5° is I1, wherein 0<I2/I1≤1.
Dependencies are inferred from the claim text.