US 12,444,770 B2
Electrolyte and electrochemical device
Chao Tang, Ningde (CN); Junfei Liu, Ningde (CN); Lilan Zhang, Ningde (CN); and Jianming Zheng, Ningde (CN)
Assigned to NINGDE AMPEREX TECHNOLOGY LIMITED, Ningde (CN)
Appl. No. 16/962,777
Filed by NINGDE AMPEREX TECHNOLOGY LIMITED, Ningde (CN)
PCT Filed Dec. 26, 2019, PCT No. PCT/CN2019/128852
§ 371(c)(1), (2) Date Jul. 16, 2020,
PCT Pub. No. WO2021/128206, PCT Pub. Date Jul. 1, 2021.
Prior Publication US 2021/0408595 A1, Dec. 30, 2021
Int. Cl. H01M 10/0567 (2010.01); C07D 327/00 (2006.01); H01M 4/02 (2006.01); H01M 4/133 (2010.01); H01M 4/36 (2006.01); H01M 4/583 (2010.01); H01M 10/0525 (2010.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01)
CPC H01M 10/0567 (2013.01) [C07D 327/00 (2013.01); H01M 4/133 (2013.01); H01M 4/366 (2013.01); H01M 4/583 (2013.01); H01M 10/0525 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electrochemical device comprising a positive electrode, a negative electrode and an electrolyte, wherein
the negative electrode comprises a negative electrode active material layer, comprising a negative electrode active material, wherein the negative electrode active material comprises a silicon-containing compound; and
the negative electrode active material further comprises, on the surface, a protective layer comprising a compound having an S═O bond,
wherein the silicon-containing compound is coated with a layer of MeyOz, wherein 1≤y≤2, 1≤z≤3, and Me is at least one selected from Ti, Al, Zr or Zn, and the layer of MeyOz has a thickness of 5 nm to 100 nm; and
wherein the electrolyte comprises at least one sulfonic anhydride compound of Formula I or Formula II:

OG Complex Work Unit Chemistry
wherein R1 to R18 are each independently selected from hydrogen, halo, substituted or unsubstituted C1-C7 alkyl, substituted or unsubstituted C2-C7 alkenyl, substituted or unsubstituted C2-C7 alkynyl, substituted or unsubstituted C6-C10 aryl, substituted or unsubstituted C1-C7 alkoxy, or substituted or unsubstituted C6-C10 aryloxy; and
wherein when substituted, the substituent is halo or cyano; and
wherein the electrolyte further comprises a fluorinated additive, wherein the fluorinated additive comprises at least one of compound 13, compound 15 or compound 19; and the fluorinated additive accounts for no less than about 5 wt % based on a weight of the electrolyte;

OG Complex Work Unit Chemistry
and
wherein the electrolyte further comprises an additive A, wherein the additive A comprises at least one of vinylene carbonate, vinyl sulfate, butanedinitrile or adiponitrile, and wherein the additive A accounts for 0.1 wt % to 10 wt % based on a weight of the electrolyte.