US 12,230,762 B2
Electrochemical apparatus and electronic apparatus containing same
Hui Cui, Fujian (CN); Jianming Zheng, Fujian (CN); Xiang Wang, Fujian (CN); and Mingming Guan, Fujian (CN)
Assigned to NINGDE AMPEREX TECHNOLOGY LIMITED, Ningde (CN)
Appl. No. 17/281,545
Filed by Ningde Amperex Technology Limited, Fujian (CN)
PCT Filed Mar. 31, 2020, PCT No. PCT/CN2020/082435
§ 371(c)(1), (2) Date Mar. 30, 2021,
PCT Pub. No. WO2021/195965, PCT Pub. Date Oct. 7, 2021.
Prior Publication US 2022/0123365 A1, Apr. 21, 2022
Int. Cl. H01M 10/0569 (2010.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01)
CPC H01M 10/0569 (2013.01) [H01M 10/0525 (2013.01); H01M 2220/30 (2013.01); H01M 2300/0034 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electrochemical apparatus, comprising:
an electrolyte, a positive electrode and a negative electrode;
wherein, the negative electrode comprises a negative active material layer, and the negative active material layer comprises a negative active material;
the electrolyte comprises fluoroethylene carbonate; and
0.5<Rct/Rcp<1.5, and both Rct and Rcp are less than 35 milliohms,
wherein Rot represents a charge transfer resistance under 50% state of charge at 25 degrees Celsius, and Rcp represents a concentration polarization resistance in the 50% state of charge at 25 degrees Celsius; and
0.005≤A/B≤0.1,
wherein 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 m2/g,
wherein the electrolyte contains a compound of formula I:

OG Complex Work Unit Chemistry
wherein R11 is selected from hydrogen, a hydroxy group, a C1-20 alkyl group, a C1-20 alkoxy group, a C2-20 alkenyl group, a C6-30 aryl group, or a C6-30 aryloxy group;
R12 is selected from hydrogen, a C1-20 alkyl group, a C2-20 alkenyl group, or a C6-30 aryl group;
wherein a mass of the compound of formula I corresponding to 1 g of the negative active material is X g, and the value of X ranges from 0.035 to 0.39, and
wherein 0.67≤X/A≤20.