Electrolyte and electrochemical device

Patent metadata

Field	Value
Publication number	US-2020243907-A1
Application number	US-202016735214-A
Country	US
Kind code	A1
Filing date	Jan 6, 2020
Priority date	Jan 25, 2019
Publication date	Jul 30, 2020
Grant date	—

Abstract

The present application relates to an electrolyte and an electrochemical device. The electrolyte comprises a cesium salt and a nitrile compound. The electrolyte provided in the present application improves rapid charge-discharge performance and cycle performance of a lithium-ion battery while improving the problem of battery gassing during continuous charge.

First claim

What is claimed is:

1 . An electrolyte, comprising a cesium salt and a nitrile compound.

2 . The electrolyte according to claim 1 , wherein the cesium salt comprises one or more of cesium hexafluorophosphate, cesium oxalate, cesium nitrate, cesium trifluoromethanesulfonate, cesium bis(trifluoromethylsulphonyl)imide, cesium tetrafluoroborate and cesium carbonate.

3 . The electrolyte according to claim 1 , wherein the content of the cesium salt is about 0.01 wt % to about 1.5 wt % based on the total weight of the electrolyte.

4 . The electrolyte according to claim 1 , wherein the nitrile compound comprises at least one of the compounds of Formula 1 to Formula 4:

wherein R 11 is selected from a substituted or unsubstituted C 1-12 alkylene group or a substituted or unsubstituted C 1-12 alkyleneoxy group;
wherein R 21 and R 22 are each independently selected from a bond, or a substituted or unsubstituted C 1-12 alkylene group;
wherein R 31 , R 32 , and R 33 are each independently selected from a bond, a substituted or unsubstituted C 1-12 alkylene group or a substituted or unsubstituted C 1-12 alkyleneoxy group; and
wherein R 41 is selected from a substituted or unsubstituted C 1-12 alkylene group, a substituted or unsubstituted C 2-12 alkenylene group, a substituted or unsubstituted C 6-26 arylene group, a substituted or unsubstituted C 6-10 cycloalkylene group or a substituted or unsubstituted C 2-12 heterocyclylene group;
wherein when substituted, the substituent is halogen.

5 . The electrolyte according to claim 1 , wherein the nitrile compound comprises at least one of:

6 . The electrolyte according to claim 1 , wherein the content of the nitrile compound is about 0.5 wt % to about 12 wt % based on the total weight of the electrolyte.

7 . The electrolyte according to claim 1 , further comprising additives, wherein the additives comprise lithium difluorophosphate, 1,3,2-dioxathiolane-2,2-dioxide, catechol sulfate or any combination thereof.

8 . The electrolyte according to claim 7 , wherein the content of the additive is about 0.05 wt % to about 5 wt % based on the total weight of the electrolyte.

9 . An electrochemical device, comprising an electrolyte, wherein the electrolyte comprises a cesium salt and a nitrile compound.

10 . The electrochemical device according to claim 9 , wherein the cesium salt comprises one or more of cesium hexafluorophosphate, cesium oxalate, cesium nitrate, cesium trifluoromethanesulfonate, cesium bis(trifluoromethylsulphonyl)imide, cesium tetrafluoroborate and cesium carbonate.

11 . The electrochemical device according to claim 9 , wherein the content of the cesium salt is about 0.01 wt % to about 1.5 wt % based on the total weight of the electrolyte.

12 . The electrochemical device according to claim 9 , wherein the nitrile compound comprises at least one of the compounds of Formula 1 to Formula 4:

wherein R 11 is selected from a substituted or unsubstituted C 1-12 alkylene group or a substituted or unsubstituted C 1-12 alkyleneoxy group;
wherein R 21 and R 22 are each independently selected from a bond, or a substituted or unsubstituted C 1-12 alkylene group;
wherein R 31 , R 32 , and R 33 are each independently selected from a bond, a substituted or unsubstituted C 1-12 alkylene group or a substituted or unsubstituted C 1-12 alkyleneoxy group; and
wherein R 41 is selected from a substituted or unsubstituted C 1-12 alkylene group, a substituted or unsubstituted C 2-12 alkenylene group, a substituted or unsubstituted C 6-26 arylene group, a substituted or unsubstituted C 6-10 cycloalkylene group or a substituted or unsubstituted C 2-12 heterocyclylene group;
wherein when substituted, the substituent is halogen.

13 . The electrochemical device according to claim 9 , wherein the nitrile compound comprises at least one of:

14 . The electrochemical device according to claim 9 , wherein the content of the nitrile compound is about 0.5 wt % to about 12 wt % based on the total weight of the electrolyte.

15 . The electrochemical device according to claim 9 , wherein the electrolyte further comprises additives, wherein the additives comprise lithium difluorophosphate, 1,3,2-dioxathiolane-2,2-dioxide, catechol sulfate or any combination thereof.

16 . The electrochemical device according to claim 15 , wherein the content of the additive is about 0.05 wt % to about 5 wt % based on the total weight of the electrolyte.

17 . An electronic device, comprising an electrochemical device, wherein the electrochemical device comprises an electrolyte, wherein the electrolyte comprises a cesium salt and a nitrile compound.

18 . The electronic device of claim 17 , wherein the cesium salt comprises one or more of cesium hexafluorophosphate, cesium oxalate, cesium nitrate, cesium trifluoromethanesulfonate, cesium bis(trifluoromethylsulphonyl)imide, cesium tetrafluoroborate and cesium carbonate.

19 . The electronic device of claim 17 , wherein the content of the cesium salt is about 0.01 wt % to about 1.5 wt % based on the total weight of the electrolyte.

20 . The electronic device of claim 17 , wherein the nitrile compound comprises at least one of the compounds of Formula 1 to Formula 4:

wherein R 11 is selected from a substituted or unsubstituted C 1-12 alkylene group or a substituted or unsubstituted C 1-12 alkyleneoxy group;
wherein R 21 and R 22 are each independently selected from a bond, or a substituted or unsubstituted C 1-12 alkylene group;
wherein R 31 , R 32 , and R 33 are each independently selected from a bond, a substituted or unsubstituted C 1-12 alkylene group or a substituted or unsubstituted C 1-12 alkyleneoxy group; and
wherein R 41 is selected from a substituted or unsubstituted C 1-12 alkylene group, a substituted or unsubstituted C 2-12 alkenylene group, a substituted or unsubstituted C 6-26 arylene group, a substituted or unsubstituted C 6-10 cycloalkylene group or a substituted or unsubstituted C 2-12 heterocyclylene group;
wherein when substituted, the substituent is halogen.

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Zhang Shuirong
• Li Wenqiang
• Ma Juan
• Tang Chao

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title