Electrolyte for rechargeable lithium battery and rechargeable lithium battery comprising same

• US 8,530,098 B2
• Filed: 05/18/2010
• Issued: 09/10/2013
• Est. Priority Date: 10/31/2003
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Kim, Jin-Hee, Kim, Jin-Sung
• Primary Examiner(s): WEINER, LAURA S
• Application Number:
  US12/782,561
• Publication Number:
  US 20100227227A1
• Time in Patent Office: 1,211 Days
• Field of Search: 429/307, 429/327, 429/232, 429/199
• US Class Current: 429/307
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 2300/0025 Organic electrolyte
• CPC Class Codes: H01M 2300/0034 Fluorinated solvents
• CPC Class Codes: H01M 2300/0037 Mixture of solvents
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 6/164 by the solvent
• CPC Class Codes: H01M 6/168 by additives
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Disclosed is an electrolyte for a rechargeable lithium battery including: a first additive having an oxidation potential of 4.1 to 4.6V; a second additive having an oxidation potential of 4.4 to 5.0V; a non-aqueous organic solvent; and a lithium salt.

Claims

1. A rechargeable lithium battery, comprising:

an electrolyte comprising a first additive having an oxidation potential from 4.1 to 4.5V, a second additive having an oxidation potential from 4.5 to 5.0V, a non-aqueous organic solvent, and a lithium salt;

a positive electrode comprising a positive active material capable of reversibly intercalating and deintercalating lithium ions; and

a negative electrode capable of reversibly intercalating and deintercalating lithium ions,

wherein at least one of the positive electrode and the negative electrode comprises a water soluble binder and a water soluble agent for increasing viscosity and wherein the first additive comprises a compound represented by Formula 2;

2. The rechargeable lithium battery according to claim 1, wherein the second additive comprises a compound represented by Formula 5: