Electrolyte and electrochemical device
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.
1. An electrolyte, comprising a cesium salt and a nitrile compound,
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; and the nitrile compound comprises at least one of the compound represented by Formula III-1 or Formula III-3:
2. The electrolyte according to claim 1 , wherein
the nitrile compound further comprises at least one of the compounds of Formula 2 or Formula 4:
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 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.
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 further comprises the compounds of Formula 1:
NC—R 11 —CN Formula 1
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;
and
wherein when substituted, the substituent is halogen.
5. The electrolyte according to claim 1 , wherein the nitrile compound further 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,
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; and the nitrile compound comprises at least one of the compound represented by Formula III-1 or Formula III-3:
10. 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.
11. The electrochemical device according to claim 9 , wherein the nitrile compound further comprises the compounds of Formula 1:
NC—R 11 —CN Formula 1
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 when substituted, the substituent is halogen.
12. The electrochemical device according to claim 9 , wherein the nitrile compound further comprises at least one of:
13. 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.
14. An electrolyte, comprising a cesium salt and a nitrile compound,
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; and the nitrile compound comprises at least one compound represented by Formula 1, and at least one of Formula III-1 or Formula III-3:
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.
15. The electrolyte according to claim 14 , 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.
16. The electrolyte according to claim 14 , wherein the nitrile compound represented by Formula 1 comprises at least one of:
17. The electrolyte according to claim 14 , wherein the nitrile compound further comprises at least one of:
18. The electrolyte according to claim 14 , wherein the content of the nitrile compound is about 0.5 wt % to about 12 wt % based on the total weight of the electrolyte.
19. The electrolyte according to claim 14 , further comprising additives, wherein the additives comprise lithium difluorophosphate, 1,3,2-dioxathiolane-2,2-dioxide, catechol sulfate or any combination thereof;
wherein the content of the additive is about 0.05 wt % to about 5 wt % based on the total weight of the electrolyte.