Ningde Amperex Technology Limited

Hui Cui

Jianming Zheng

Mingming Guan

Xiang Wang

An electrochemical apparatus includes an electrolyte, a positive electrode and a negative electrode, the negative electrode includes a negative active material layer, the negative active material layer includes a negative active material, the electrolyte includes fluoroethylene carbonate, and the electrochemical apparatus satisfies the following relational expressions: 0.5<R/R<1.5 and both Rand Rare less than 35 milliohms, and 0.005≤A/B≤0.1; where Rrepresents a charge transfer resistance under 50% state of charge at 25 degrees Celsius, and Rrepresents a concentration polarization resistance in the 50% state of charge at 25 degrees Celsius; a mass of the fluoroethylene carbonate corresponding to 1 g of the negative active material is A g, and a specific surface area of the negative active material is B m/g. This application aims to improve the fast charging performance of the electrochemical apparatus while maintaining the cycle performance thereof.

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Hui Cui