Additive for non-aqueous electrolyte and secondary battery using the same

• US 7,666,330 B2
• Filed: 04/19/2006
• Issued: 02/23/2010
• Est. Priority Date: 04/20/2005
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Yu Sin, Cha, Hye Yun, Kim, Hyeong Jin, Lee, Ho Chun
• Primary Examiner(s): MC GINTY, DOUGLAS J
• Application Number:
  US11/406,640
• Publication Number:
  US 20060263696A1
• Time in Patent Office: 1,406 Days
• Field of Search: 252/521.6, 252/519.32, 252/519.3, 252/518.1, 252/519.4, 252/519.21, 252/519.2, 252/521.5
• US Class Current: 252/519.21
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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: Y02E 60/10 Energy storage using batteries

Abstract

Disclosed is a compound represented by the following formula 1:

• • wherein, each of R¹˜R¹³ independently represents —H, —F, —Cl, —Br, —I, —OH, —SH, —COOH, —PO₃H₂, —NH₂, —NO₂, —O(CH₂CH₂O)_nH (wherein, n is an integer of 1˜5), C₁˜C₁₂ alkyl group, C₁˜C₁₂ aminoalkyl group, C₁˜C₁₂ hydroxyalkyl group, C₁˜C₁₂ haloalkyl group, C₂˜C₁₂ alkenyl group, C₁˜C₁₂ alkoxy group, C₁˜C₁₂ alkylamino group, C₁˜C₁₂ dialkylamino group, C₆˜C₁₈ aryl group, C₆˜C₁₈ aminoaryl group, C₆˜C₁₈ hydroxyaryl group, C₆˜C₁₈ haloaryl group, C₇˜C₁₈ benzyl group, C₇˜C₁₈ aminobenzyl group, C₇˜C₁₈ hydroxybenzyl group, C₇˜C₁₈ halobenzyl group, or nitrile group (—CN); and at least one of R⁴˜R¹³ is nitrile group (—CN). A non-aqueous electrolyte comprising: (i) a lithium salt, (ii) a solvent, and (iii) a compound represented by formula 1; and a secondary battery comprising the non-aqueous electrolyte are also disclosed. When the compound represented by formula 1 is added to a non-aqueous electrolyte, it is possible to improve the safety of a secondary battery in an overcharged state.

Claims

1. A non-aqueous electrolyte, which comprises:

(i) a lithium salt selected from the group consisting of LiClO₄, LiCF₃SO₃, LiPF₆, LiBF₄, LiAsF₆, and LiN(CF₃SO₂)₂;

(ii) a solvent selected from the group consisting of a cyclic carbonate, a linear carbonate, and a combination thereof; and

(ii) a compound represented by the following formula 2;

2. The non-aqueous electrolyte according to claim 1, wherein the compound represented by formula 1 is used in an amount of 0.5 wt %˜

10 wt % based on 100 wt % of the non-aqueous electrolyte.

3. The non-aqueous electrolyte according to claim 1, which further comprises cyclohexylbenzene or a derivative thereof.

4. The non-aqueous electrolyte according to claim 1, which further comprises a benzene derivative capable of forming a polymer.

5. The non-aqueous electrolyte according to claim 1, wherein the solvent includes at least one cyclic carbonate selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), and gamma-butyrolactone (GBL);

and at least one linear carbonate selected from the group consisting of diethyl carbonate (DEC), dimethyl carbonate (DMC), ethylmethyl carbonate (EMC), and methyl propyl carbonate (MPC).