Electrolyte and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-9935334-B2
Application number	US-201514610912-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Feb 3, 2014
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

An electrolyte for a rechargeable lithium battery includes a lithium salt, a non-aqueous organic solvent, and an additive. The additive is represented by Chemical Formula 1, and is included in an amount of about 0.05 wt % to about 3 wt % based on the total amount of the electrolyte. A rechargeable lithium battery including the same is also disclosed.

Chemical Formula 1 is as described in the present specification.

First claim

What is claimed is:

1. A rechargeable lithium battery comprising
a positive electrode comprising Li a A 1-b R b D 2 (0.90≤a≤1.8 and 0≤b≤0.5, A is Ni, Co, Mn, or a combination thereof; R is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; D is O, F, S, P, or a combination thereof) as a positive active material;
a negative electrode comprising graphite as a negative active material; and
an electrolyte comprising LiPF 6 as a lithium salt, a mixture of carbonates, the carbonate being selected from dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methylpropyl carbonate (MPC), ethylpropyl carbonate (EPC), methylethyl carbonate (MEC), ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC) as a non-aqueous organic solvent, and an additive represented by Chemical Formula 1:

wherein R 1 and R 2 are each independently an unsubstituted C1 to C5 alkylene group,
wherein the additive is in an amount of about 0.1 wt % to about 3 wt % based on the total amount of the electrolyte.

2. The rechargeable lithium battery of claim 1 , wherein the additive is in an amount of about 1 wt % to about 3 wt % based on the total amount of the electrolyte.

3. The rechargeable lithium battery of claim 1 , wherein the lithium salt is in a concentration of about 0.9 M to about 1.5 M.

4. A rechargeable lithium battery comprising:
a positive electrode comprising Li a A 1-b R b D 2 (0.90≤a≤1.8 and 0≤b≤0.5, A is Ni, Co, Mn, or a combination thereof; R is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; D is O, F, S, P, or a combination thereof) as a positive active material;
a negative electrode comprising graphite as a negative active; and
an electrolyte comprising LiPF 6 as a lithium salt, a mixture of carbonates, the carbonate being selected from dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methylpropyl carbonate (MPC), ethylpropyl carbonate (EPC), methylethyl carbonate (MEC), ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC) as a non-aqueous organic solvent, and an additive represented by Chemical Formula 1:

wherein R 1 and R 2 are each independently a C1 to C5 alkylene group substituted with a C1 to C10 alkylsilyl group, a C3 to C30 cycloalkyl group, a C6 to C30 aryl group, a C1 to C30 heteroaryl group, a C1 to C10 alkoxy group, a silane group, an alkylsilane group, an alkoxysilane group, an amine group, an alkylamine group, an arylamine group, or a halogen, and
wherein the additive is in an amount of about 0.1 wt % to about 3 wt % based on the total amount of the electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lim Jin-Hyeok
• Yang Ho-Seok
• Kim Yun-Hee
• Park Young Sam
• Hwang Hee-Yeon
• Kim Hyun-Woo
• Park Se-Jeong
• Lee Min-Young

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title