Electrochemical device and electronic device
AssigneeDongguan Amperex Technology Limited
InventorsLilan Zhang, Hui Cui, Chao Tang
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Abstract
An electrochemical device includes a negative electrode plate and an electrolyte. The negative electrode plate includes a negative active material. A specific surface area of the negative active material is A m2/g and 0.3≤A≤4. The electrolyte includes fluorocarboxylate and fluorocarbonate. Based on a mass of the electrolyte, a mass percent of the fluorocarboxylate is X % and a mass percent of the fluorocarbonate is Y %, 5≤Y≤70, and the electrochemical device satisfies 50≤X+Y≤85, and 6≤Y/A≤200. The synergy between the negative active material and the electrolyte can effectively improve cycle performance of the electrochemical device under high voltages, and alleviate lithium plating of the negative electrode.
Claims20
An electrochemical device, comprising a negative electrode plate and an electrolyte;
- wherein the negative electrode plate comprises a negative active material, a specific surface area of the negative active material is A m2/g and 0.3≤A≤4;
- the electrolyte comprises fluorocarboxylate and fluorocarbonate;
- and, based on a mass of the electrolyte, a mass percent of the fluorocarboxylate is X % and a mass percent of the fluorocarbonate is Y %, 5≤Y≤70, and 55≤X+Y≤85, and 6≤Y/A≤200.
An electronic device, comprising an electrochemical device, the electrochemical device comprising a negative electrode plate and an electrolyte;
- wherein the negative electrode plate comprises a negative active material, a specific surface area of the negative active material is A m2/g and 0.3≤A≤4;
- the electrolyte comprises fluorocarboxylate and fluorocarbonate;
- and, based on a mass of the electrolyte, a mass percent of the fluorocarboxylate is X % and a mass percent of the fluorocarbonate is Y %, 5≤Y≤70, and 50≤X+Y≤85, and 6≤Y/A≤200.
Dependencies are inferred from the claim text.