Solid electrolyte and preparation method therefor, and lithium-ion battery containing same
AssigneeBYD Company Limited
InventorsGUANGUI YI, Yongjun Ma, Zizhu Guo, Xianghui Wang, Jing Xie
Life of this patent
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Abstract
A solid electrolyte contains an internal component and an external component coated on a surface of the internal component. The internal component is represented by a formula Li1+xMxTi2−x(PO4)3, M is one or more elements selected from a group consisting of Al, La, Cr, Ga, Y, and In, and 0.05≤x≤0.4. The external component has an ionic conductivity of no less than 10−6 S/cm, an electrochemical window of the solid electrolyte is no less than 5V. A method of preparing the solid electrolyte and a lithium ion battery including the solid electrolyte are also provided.
Claims20
A solid electrolyte, comprising:
- an internal component represented by a formula Li1+xMxTi2−x(PO4)3, M being one or more elements selected from the group consisting of Al, La, Cr, Ga, Y, and In, and 0.05≤x≤0.4;
- and
- an external component coated on a surface of the internal component,
- wherein the external component has an ionic conductivity of no less than 10−6 S/cm, and an electrochemical window of the solid electrolyte is no less than 5V.
A method for preparing a solid electrolyte, comprising:
- obtaining an internal component represented by a formula Li1+xMxTi2−x(PO4)3, M being one or more elements selected from a group consisting of Al, La, Cr, Ga, Y, and In, and 0.05≤x≤0.4;
- obtaining and dissolving a lithium source, a phosphate, a fluorine source and a boron source in water to form a raw materials solution of an external component, wherein a molar ratio of elements lithium:
- boron:
- phosphorus:
- fluorine in the raw materials solution of the external component is 0.15˜0.165:
- 0.95:
- (1−y):
- (3y), and 0.01≤y≤0.5;
- obtaining a precursor material by mixing the internal component with the raw materials solution of the external component, and regulating pH value to be 8˜11;
- and
- performing a first calcination to the precursor materials to obtain the solid electrolyte, wherein the solid electrolyte comprises the internal component and the external component coated on a surface of the internal component.
A lithium ion battery comprising:
- a cathode;
- an anode;
- and
- a solid electrolyte disposed between the cathode and the anode, wherein the solid electrolyte comprising:
- an internal component represented by a formula Li1+xMxTi2−x(PO4)3, M being one or more elements selected from the group consisting of Al, La, Cr, Ga, Y, and In, and 0.05≤x≤0.4;
- and
- an external component coated on a surface of the internal component,
- wherein the external component has an ionic conductivity of no less than 10—6 S/cm, and an electrochemical window of the solid electrolyte is no less than 5V.
Dependencies are inferred from the claim text.