Electrolyte for lithium secondary battery and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11024880-B2
Application number	US-201816140824-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	May 29, 2018
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

Disclose are an electrolyte composite for a lithium secondary battery having an improved output; a cathode including a protective film on its surface; and a lithium secondary battery comprising the same.

First claim

What is claimed is:

1. An electrolyte composite for a lithium secondary battery, comprising:
a lithium salt; and
an additive comprising Bis(trimethylsilyl)fumarate or Bis(trimethylsilyl)thiophene-2,5-dicarboxylate,
wherein a content of the additive is within a range of 0.2 wt % to 3 wt % with respect to the total weight of the electrolyte composite, and
wherein the additive further comprises trimethyl(phenyl)silane in an amount of 0.5 wt % to 5 wt % with respect to the total weight of the electrolyte, and
wherein the additive further comprises the vinylene carbonate (VC) in an amount of 0.5 wt %.

2. A lithium secondary battery, comprising:
a positive electrode comprising a positive active material;
a negative electrode comprising a negative active material;
a separation film disposed between the positive electrode and the negative electrode; and
an electrolyte,
wherein the electrolyte comprises:
a lithium salt; and
an additive comprising at least one of bis(trimethylsilyl)fumarate and bis(trimethylsilyl)thiophene-2,5-dicarboxylate,
wherein a content of the additive is within a range of 0.2 wt % to 3 wt % with respect to the total weight of the electrolyte composite, and
wherein the additive further comprises trimethyl(phenyl)silane in an amount of 0.5 wt % to 5 wt % with respect to the total weight of the electrolyte, and
wherein the additive further comprises the vinylene carbonate(VC) in an amount of 0.5 wt %.

3. The lithium secondary battery of claim 2 , wherein the lithium salt is one or more materials selected from the group consisting of LiPF 6 , LiBF 4 , LiClO 4 , LiCl, LiBr, LiI, LiB 10 Cl 10 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, LiN(SO 2 C 2 F 5 ) 2 , Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiB(C 6 H 5 ) 4 , Li(SO 2 F) 2 N(LiFSI) and (CF 3 SO 2 ) 2 NLi.

4. The lithium secondary battery of claim 2 , wherein the electrolyte further comprises a solvent comprising one or more materials selected from a group consisting of ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), propylene carbonate (PC), dipropyl carbonate (DPC), buthylene carbonate (BC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), and ethyl methyl carbonate (EMC).

5. The lithium secondary battery of claim 2 , wherein the positive active material comprises a lithium nickel-manganese-cobalt ternary positive active material comprising nickel (Ni) in an amount of 30 wt % to 100 wt % with respect to the total weight of the positive active material.

6. The lithium secondary battery of claim 2 , wherein the separation film comprises a ceramic coating separation film.

7. A vehicle comprising a lithium secondary battery of claim 2 .

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Lee Yoon Sung
• Koh Kiseok
• Cho Jung Young
• Kim Ikkyu
• Yeo Yeolmae
• Oh Seung-Min
• Kim Sa Heum
• Choi Sungmin

Classifications

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0563 Primary

  Liquid materials, e.g. for Li-SOCl2 cells · CPC title

• H01M50/434

  Ceramics · CPC title

• H01M10/0569

  characterised by the solvents · CPC title