Electrochemical device and electronic device
AssigneeNingde Amperex Technology Limited
InventorsJianyu LIU, Chao TANG
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Abstract
An electrochemical device includes a positive electrode, a negative electrode, a separator, and an electrolytic solution. The electrolytic solution includes fluoroethylene carbonate and a trinitrile compound. Based on a mass of the electrolytic solution, a mass percent of the fluoroethylene carbonate is A %, 2≤A≤6, a mass percent of the trinitrile compound is B %, 2≤B≤5, and A and B satisfy: 4≤A×B≤20. A defect rate of the negative electrode is denoted by an Id/Ig ratio, and satisfies: 0.07<Id/Ig≤0.13. The mass percent A % of the fluoroethylene carbonate and the Id/Ig ratio satisfy: 1.5≤A/(10×Id/Ig)≤8.6. This improves the energy density, cycle performance, and safety performance of the electrochemical device.
Claims14
An electrochemical device, comprising a positive electrode, a negative electrode, a separator, and an electrolytic solution;
- wherein
- the electrolytic solution comprises fluoroethylene carbonate and a trinitrile compound;
- based on a mass of the electrolytic solution, a mass percent of the fluoroethylene carbonate is A %, 2≤A≤6, a mass percent of the trinitrile compound is B %, 2≤B≤5, and 4≤A×B≤20;
- a defect rate of the negative electrode is denoted by an Id/Ig ratio, and 0.07<Id/Ig≤0.13;
- and 1.5≤A/(10×Id/Ig)≤8.6.
An electronic device, comprising an electrochemical device, the electrochemical device comprises a positive electrode, a negative electrode, a separator, and an electrolytic solution, wherein
- the electrolytic solution comprises fluoroethylene carbonate and a trinitrile compound, and, based on a mass of the electrolytic solution, a mass percent of the fluoroethylene carbonate is A %, 2≤A≤6, a mass percent of the trinitrile compound is B %, 2≤B≤5, A and B satisfy:
- 4≤A×B≤20, a defect rate of the negative electrode is denoted by an Id/Ig ratio, and satisfies:
- 0.07<Id/Ig≤0.13, and the mass percent A % of the fluoroethylene carbonate and the Id/Ig ratio satisfy:
- 1.5≤A/(10×Id/Ig)≤8.6.
Dependencies are inferred from the claim text.