Rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-11342586-B2
Application number	US-201816113254-A
Country	US
Kind code	B2
Filing date	Aug 27, 2018
Priority date	Sep 5, 2017
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

A rechargeable lithium battery including a negative electrode; a positive electrode including a positive active material; and a non-aqueous electrolyte, wherein the non-aqueous electrolyte includes a non-aqueous organic solvent, a lithium salt, a first additive including a compound represented by one of Chemical Formulae 1 to 4 and a second additive including a compound represented by Chemical Formula 5 or Chemical Formula 6, or a combination thereof, the positive active material includes a compound that includes about 70 mol % or greater of Ni based on the total mole number of all metal elements except for Li,

First claim

What is claimed is:

1. A rechargeable lithium battery, comprising:
a negative electrode;
a positive electrode including a positive active material; and
a non-aqueous electrolyte,
wherein:
the electrolyte includes:
a non-aqueous organic solvent,
a lithium salt,
about 0.5 wt % to about 5 wt % of trimethylsilyl ethane sulfonate, and
about 0.5 wt % to about 7 wt % of lithium difluorobis(oxalato)phosphate, all wt % being based on a total weight of the electrolyte,

the positive active material includes a compound represented by Chemical Formula 7 ,
Li a Ni x Co y M′ z O 2   [Chemical Formula 7]

in Chemical Formula 7,
0.9≤a≤1.1, 0.8≤x≤0.98, 0<y≤0.3, 0<z≤0.3, x+y+z=1, and
M′ is Mn or Al.

2. The rechargeable lithium battery as claimed in claim 1 , wherein:
the electrolyte includes:
1 wt % of trimethylsilyl methane ethane sulfonate, and
1 wt % to 7 wt % of lithium difluorobis(oxalato)phosphate, and

the positive active material includes LiNi 0.84 Co 0.11 Al 0.05 O 2 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Yunhee
• Kim Kyoung Soo
• Kim Taejeong
• Park Dohyung
• You Yongchan
• Cho Erang
• Choi Sun-Joo

Classifications

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0525

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

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title