ELECTROLYTE FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

• US 20200136184A1
• Filed: 01/17/2018
• Published: 04/30/2020
• Est. Priority Date: 04/28/2017
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited, Sogang University Research Foundation
• Original Assignee: Samsung SDI Company Limited, Sogang University Research Foundation
• Inventors: KIM, Aeran, MOON, Bongjin, PARK, Myungjun, SHIN, Woo Cheol, SHIN, Jeongmin, JEON, Kayoung, CHOI, Hyunbong
• Granted Patent: US 11,424,483 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Disclosed are an electrolyte for lithium secondary battery, and a lithium secondary battery comprising same, the electrolyte comprising: a non-aqueous organic solvent; lithium salt; and an additive represented by Chemical Formula 1.

Claims

1. An electrolyte for a lithium secondary battery, comprising:

a non-aqueous organic solvent;

a lithium salt; and

an additive represented by Chemical Formula 1;

2. The electrolyte for a lithium secondary battery of claim 1, wherein an amount of the additive is 0.1 wt % to 2 wt % based on a total weight of the electrolyte.

3. The electrolyte for a lithium secondary battery of claim 1, wherein an amount of the additive is 0.5 wt % to 2 wt % based on a total weight of the electrolyte.

4. The electrolyte for a lithium secondary battery of claim 1, wherein R_a, R_b, R_c, and R_d are each independently a substituted or unsubstituted alkyl group.

5. The electrolyte for a lithium secondary battery of claim 1, wherein R_a, R_b, R_c, and R_d are each independently a substituted or unsubstituted alkyl group in which a carbon number of the alkyl group is 1 to 5.

6. A lithium secondary battery comprising:

a negative electrode including a negative active material;

a positive electrode including a positive active material; and

the electrolyte of claim 1.

7. The lithium secondary battery of claim 6, wherein the positive active material includes a compound capable of intercalating and deintercalating lithium.

8. The lithium secondary battery of claim 6, wherein the positive active material is:

Li_aCo_1-bX_bD₂ bin which 0.90≤

a≤

1.8, 0≤

b≤

0.5, X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof, and D is O, F, S, P, or a combination thereof, or

Li_aCo_1-bX_bO_2-cT_c in which 0.90≤

a≤

1.8, 0≤

b≤

0.5, 0≤

c≤

0.05, X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof, and T is F, S, P, or a combination thereof.