Rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-2025038200-A1
Application number	US-202318537222-A
Country	US
Kind code	A1
Filing date	Dec 12, 2023
Priority date	Jul 14, 2023
Publication date	Jan 30, 2025
Grant date	—

Abstract

A rechargeable lithium battery and the rechargeable lithium battery including a positive electrode is provided. The positive electrode includes a positive active material and sulfur, a negative electrode comprising a negative active material and sulfur, and a non-aqueous electrolyte. An amount of sulfur in the positive electrode is at least twice an amount of sulfur in the negative electrode.

First claim

What is claimed is:

1 . A rechargeable lithium battery, comprising:
a positive electrode comprising a positive active material and an amount of sulfur; a negative electrode comprising a negative active material and an amount of sulfur; and a non-aqueous electrolyte, wherein the amount of sulfur comprised in the positive electrode is at least twice the amount of sulfur comprised in the negative electrode.

2 . The rechargeable lithium battery as claimed in claim 1 , wherein the amount of sulfur comprised in the positive electrode is two times to five times the amount of sulfur comprised in the negative electrode.

3 . The rechargeable lithium battery as claimed in claim 1 , wherein the amount of sulfur comprised in the positive electrode is about 0.01 wt % to about 0.7 wt % based on a total 100 wt % of the battery.

4 . The rechargeable lithium battery as claimed in claim 1 , wherein the amount of sulfur comprised in the positive electrode is about 0.03 wt % to about 0.7 wt % based on a total 100 wt % of the battery.

5 . The rechargeable lithium battery as claimed in claim 1 , wherein the amount of sulfur comprised in the negative electrode is more than 0 wt % and at most about 0.7 wt % based on a total 100 wt % of the battery.

6 . The rechargeable lithium battery as claimed in claim 1 , wherein the amount of sulfur comprised in the negative electrode is about 0.01 wt % to about 0.33 wt % based on a total 100 wt % of the battery.

7 . The rechargeable lithium battery as claimed in claim 1 , wherein the positive active material is a compound represented by Chemical Formula 1:

wherein,
0.9≤a1≤1.1, 0.8≤x1≤0.98, 0.01≤y1≤0.19, 0.01≤z1≤0.19, x1+y1+z1=1, and A is Mn or Al.

8 . The rechargeable lithium battery as claimed in claim 1 , wherein the rechargeable lithium battery is a battery subjected to a formation charging and discharging.

9 . The rechargeable lithium battery as claimed in claim 8 , wherein the formation charging and discharging is performed at about 0.1 C to about 0.3 C for one time to three times.

10 . The rechargeable lithium battery as claimed in claim 1 , wherein the positive electrode comprises a positive active material layer that comprises a positive active material layer composition comprising the positive active material, and an additive represented by Chemical Formula 2 or one or more additives represented by one or more selected from among Chemical Formulas 3 to 5:
Chemical Formula 2
and
wherein,
A 1 , A 2 , A 3 and A 4 are each independently selected from among a covalent bond; a substituent-substituted or unsubstituted C1 to C5 alkylene group; a carbonyl group; and a sulfinyl group, provided that A1 and A2 are not concurrently a covalent bond and A 3 and A 4 are not concurrently a covalent bond;
Chemical Formula 3 Chemical Formula 4 Chemical Formula 5

11 . The rechargeable lithium battery as claimed in claim 10 , wherein the additive represented by Chemical Formula 2 is represented by Chemical Formula 2a or Chemical Formula 2b:
Chemical Formula 2a Chemical Formula 2b  and
wherein,
Z 1 , Z 2 , Z 3 , Z 4 , Z 5 , and Z 6 are each independently —C(E 1 )(E 2 )-; a carbonyl group; or a sulfinyl group, and
E 1 and E 2 are each independently selected from among hydrogen; halogen; a halogen-substituted or unsubstituted C1 to C20 alkyl group; a halogen-substituted or unsubstituted C2 to C20 alkenyl group; a halogen-substituted or unsubstituted C2 to C20 alkynyl group; a halogen-substituted or unsubstituted C3 to C20 cycloalkenyl group; a halogen-substituted or unsubstituted C3 to C20 heterocyclic group; a halogen-substituted or unsubstituted C6 to C40 aryl group; and a halogen-substituted or unsubstituted C2 to C40 heteroaryl group.

12 . The rechargeable lithium battery as claimed in claim 10 , wherein the additive represented by Chemical Formula 2 is at least one compound represented by at least one selected from among Chemical Formulas 6 to 9:
Chemical Formula 6 Chemical Formula 7 Chemical Formula 8 Chemical Formula 9

13 . The rechargeable lithium battery as claimed in claim 11 , wherein the additive represented by Chemical Formula 2 is a compound represented by Chemical Formula 6.

14 . The rechargeable lithium battery as claimed in claim 10 , wherein an amount of the additive represented by Chemical Formula 2 or the one or more additives represented by one or more selected from among Chemical Formulas 3 to 5 is about 0.6 wt % to about 1.8 wt % based on a total of 100 wt % of the positive active material layer composition.

15 . The rechargeable lithium battery as claimed in claim 1 , wherein a charge capacity of the battery after storing at 60° C. for 30 days is at least 87% of a charge capacity of the battery before storing.

16 . A method to form a rechargeable lithium battery, the method comprising:
adding an additive represented by Chemical Formula 2 or one or more additives represented by one or more selected from among Chemical Formulas 3 to 5 to form a positive active material layer composition for a positive electrode;
Chemical Formula 2
 and
wherein,
A 1 , A 2 , A 3 and A 4 are each independently selected from a covalent bond; a substituent-substituted or unsubstituted C1 to C5 alkylene group; carbonyl group; or a sulfinyl group, provided that A1 and A2 are not concurrently a covalent bond and A 3 and A 4 are not concurrently a covalent bond;

Chemical Formula 3
Chemical Formula 4
Chemical Formula 5
 and
subjecting the positive electrode in a battery to a formation charging and discharging at about 0.1 C to about 0.3 C for one time to three times to from the rechargeable lithium battery.

17 . The method as claimed in claim 16 , wherein the additive represented by Chemical Formula 2 is represented by Chemical Formula 2a or Chemical Formula 2b:
Chemical Formula 2a Chemical Formula 2b  and
wherein,
Z 1 , Z 2 , Z 3 , Z 4 , Z 5 , and Z 6 are each independently —C(E 1 )(E 2 )-; a carbonyl group; or a sulfinyl group, and
E 1 and E 2 are each independently selected from among hydrogen; halogen; a halogen-substituted or unsubstituted C1 to C20 alkyl group; a halogen-substituted or unsubstituted C2 to C20 alkenyl group; a halogen-substituted or unsubstituted C2 to C20 alkynyl group; a halogen-substituted or unsubstituted C3 to C20 cycloalkenyl group; a halogen-substituted or unsubstituted C3 to C20 heterocyclic group; a halogen-substituted or unsubstituted C6 to C40 aryl group; and a halogen-substituted or unsubstituted C2 to C40 heteroaryl group.

18 . The method as claimed in claim 16 , wherein the additive represented by Chemical Formula 2 is at least one compound represented by at least one selected from among Chemical Formulas 6 to 9:
Chemical Formula 6 Chemical Formula 7 Chemical Formula 8 Chemical Formula 9

19 . The method as claimed in claim 16 , wherein the additive represented by Chemical Formula 2 is a compound represented by Chemical Formula 6.

20 . The method as claimed in claim 16 , wherein an amount of the additive represented by Chemical Formula 2 or the one or more additives represented by one or more selected from among Chemical Formulas 3 to 5 is about 0.6 wt % to about 1.8 wt % based on a total 100 wt % of the positive active material layer composition.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Cho Erang
• Lim Jin-Hyeok
• Seo Jinah
• Koh Sujeong
• Kim Yunhee
• Lee Minju

Classifications

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0567

  characterised by the additives · CPC title