Additive, electrolyte for lithium secondary battery and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11239499-B2
Application number	US-201916705004-A
Country	US
Kind code	B2
Filing date	Dec 5, 2019
Priority date	Dec 13, 2018
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

An additive for a lithium secondary battery includes a compound represented by Formula 1 below, where R1 to R4 are as defined in the disclosure. An electrolyte for a lithium secondary battery includes: a lithium salt; a non-aqueous organic solvent; and the additive. A lithium secondary battery includes: a cathode; an anode; and the electrolyte.

First claim

What is claimed is:

1. An electrolyte for a lithium secondary battery, comprising:
a lithium salt;
a non-aqueous organic solvent; and
an additive comprising a compound represented by Formula 1 below:

wherein, in Formula 1,
R 1 to R 4 are each independently a substituted or unsubstituted C 1 -C 30 alkyl group or a substituted or unsubstituted C 2 -C 30 alkenyl group, and
a substituent of the substituted C 1 -C 30 alkyl group or the substituted C 2 -C 30 alkenyl group comprises at least one selected from a C 1 -C 20 alkyl group, a C 2 -C 20 alkenyl group, a C 2 -C 20 alkynyl group, a C 1 -C 20 alkoxy group, a halogen, a cyano group, a hydroxy group, and a nitro group.

2. The electrolyte of claim 1 , wherein,
a weight of the additive is in a range of about 0.1 wt % to about 10 wt % based on a total weight of the electrolyte.

3. The electrolyte of claim 1 , wherein,
a weight of the additive is in a range of about 0.1 wt % to about 5 wt % based on a total weight of the electrolyte.

4. The electrolyte of claim 1 , wherein,
the lithium salt comprises at least one selected from LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiClO 4 , LiCF 3 SO 3 , Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiAlO 2 , LiAlCl 4 , LiN(C x F 2x+1 SO 2 )(C y F 2y+1 SO 2 ) (0≤x≤20, 0≤y≤20), LiCl, LiI, lithium bis(oxalate) borate (LiBOB), and LiPO 2 F 2 .

5. The electrolyte of claim 1 , wherein,
the non-aqueous organic solvent comprises at least one selected from ethyl methyl carbonate (EMC), methyl propyl carbonate, ethyl propyl carbonate, dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, propylene carbonate (PC), ethylene carbonate (EC), fluoroethylene carbonate (FEC), vinylene carbonate (VC), vinylethylene carbonate (VEC), butylene carbonate, ethyl propionate, ethyl butyrate, dimethyl sulfoxide, dimethyl formamide, dimethylacetamide, gamma-valerolactone, gamma-butyrolactone, and tetrahydrofuran.

6. A lithium secondary battery, comprising:
a cathode;
an anode; and
the electrolyte of claim 1 .

7. The lithium secondary battery of claim 6 , wherein,
the anode comprises at least one selected from a lithium metal, a metal alloyable with lithium, a transition metal oxide, a non-transition metal oxide, and a carbon-based material.

8. The lithium secondary battery of claim 6 , wherein,
the cathode comprises a cathode active material having a layered structure.

9. The lithium secondary battery of claim 8 , wherein,
the cathode active material is represented by Formula 3:
LiNi 1-s M′ s O 2   <Formula 3>

wherein, in Formula 3,
M′ is at least one selected from Co, Mn, Al, Cu, Fe, Mg, Cr, Zn, B, and Ga, and 0<s≤0.99 is satisfied.

10. The lithium secondary battery of claim 8 , wherein,
the cathode active material is represented by Formula 4:
Li t (Ni 1-u-v Co u M″ v )O 2   <Formula 4>

wherein, in Formula 4,
M″ is Mn or Al, and 0.96≤t≤1.05, 0<u≤0.5, and 0<v≤0.5 are satisfied.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lim Jinhyeok
• Shatunov Pavel
• TSAY Olga
• Park Hyejin
• Woo Myungheui
• You Duckjae
• Lee Taejin
• Lee Harim
• Cho Wonseok
• Choi Hyunbong

Classifications

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M10/0525

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