Ningde Amperex Technology Limited

Contemporaryamperextechnologyco.,limited

Contemporary Amperex Technology Co., Ltd.

Xiang Hong

Lingyan Jiang

Kaifu Zhong

Jiewei Zhang

The present disclosure provides a positive electrode additive and a preparation method thereof, a positive electrode plate and a lithium-ion secondary battery. The positive electrode additive comprises a modified lithium carbonate. The modified lithium carbonate comprises a lithium carbonate particle and a polymer coating. The polymer coating coats a surface of the lithium carbonate particle and comprises a polymer. The positive electrode additive of the present disclosure has low cost and simple preparation method, when the positive electrode additive is applied in lithium-ion secondary battery, it can significantly improve lithium-ion secondary battery safety performance without affecting electrical performance of the lithium-ion secondary battery.

Positive electrode additive and preparation method therefor, positive electrode plate and secondary lithium ion battery

The present disclosure provides a cell and a preparation method thereof. The cell comprises a positive electrode plate (); a negative electrode plate () and a composite solid electrolyte membrane () positioned between the positive electrode plate () and the negative electrode plate (). The composite solid electrolyte membrane () comprises inorganic solid electrolyte layers () and structure supporting layers () which are alternately laminated along a laminating direction (D), and has abutted surfaces (S) respectively abutting against the positive electrode plate () and the negative electrode plate (), an angle between the laminating direction (D) and the abutted surface (S) is defined as &#x3b1;, and 0&#xb0;&#x2266;&#x3b1;&#x3c;90&#xb0;. The composite solid electrolyte membrane not only plays an advantage of a high lithium ionic conductivity of the inorganic solid electrolyte, but also has an excellent mechanical processing property, thereby significantly improving electrochemical performance and safety performance of the cell.

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Ningde, China

Xiang Hong