Lithium secondary battery

Patent metadata

Field	Value
Publication number	US-11508990-B2
Application number	US-201916597613-A
Country	US
Kind code	B2
Filing date	Oct 9, 2019
Priority date	Feb 19, 2019
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

A lithium secondary battery includes: a cathode, an anode; and an electrolyte between the cathode and the anode, wherein the cathode includes a cathode active material represented by Formula 1 below, and the electrolyte includes a lithium salt, a non-aqueous solvent, and a compound represented by Formula 2, where x, y, z, M, A, L1, a1, and R1 to R4 are defined as described in the disclosure.

First claim

What is claimed is:

1. A lithium secondary battery, comprising:
a cathode;
an anode; and
an electrolyte between the cathode and the anode,
wherein the cathode comprises a cathode active material represented by Formula 4,
the electrolyte includes a lithium salt, a non-aqueous solvent, and a compound represented by Formula 2, and
wherein a weight of the compound represented by Formula 2 above is 0.05 wt % or more and less than 5 wt % based on a total weight of the electrolyte:
Li x′ Ni y′ Co 1-y′-z′ Mn z′ O 2   Formula 4

wherein, in Formula 4,
0.9≤x′≤1.2, 0.88≤y′≤0.98, 0<z′≤0.015, and 0<1-y′-z′<0.2 are satisfied; and

wherein, in Formula 2,
L 1 is selected from *—N(R 5 )—*′, *—O—*′, *—S—*′, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 2 -C 30 alkynyl group, and a substituted or unsubstituted C 2 -C 30 alkoxyalkyl group,
a1 is an integer 0 to 3, and the L 1 s are the same as or different from each other when a1 is 2 or more,
R 1 to R 4 are each independently a methyl group, R 5 is selected from a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, and a substituted or unsubstituted vinyl group, and
* and *′ indicate a binding site to a neighboring atom.

2. The lithium secondary battery of claim 1 , wherein, in Formula 2, L 1 is selected from a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, and a heptylene group; and
a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, and a heptylene group, each of which is substituted with at least one selected from a methyl group, an ethyl group, a propyl group, a vinyl group, —F, —Cl, —Br, —I, a cyano group, a hydroxy group, and a nitro group.

3. The lithium secondary battery of claim 1 , wherein, in Formula 2, a1 is 1 or 2.

4. The lithium secondary battery of claim 1 , wherein, in Formula 2,
i) a1 is 1, and L 1 is an ethylene group; or
ii) a1 is 2, and L is a methylene group.

5. The lithium secondary battery of claim 1 , wherein,
the compound is Compound 1 below:

6. The lithium secondary battery of claim 1 , wherein,
a weight of the compound represented by Formula 2 is 0.1 wt % to 4 wt % based on a total weight of the electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Cho Wonseok
• Shatunov Pavel
• TSAY Olga
• Kang Younghye
• Kim Aeran
• Park Hyejin
• Shin Jeongmin
• Woo Myungheui
• You Duckjae
• Lee Taejin
• Lee Harim
• Lim Jinhyeok
• Choi Hyunbong

Classifications

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/131 Primary

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

• 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