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Nonaqueous electrolyte solution and lithium secondary battery using same

A non-aqueous electrolyte, lithium secondary battery technology, used in secondary batteries, circuits, electrical components, etc., to achieve the effect of excellent battery cycle performance

Inactive Publication Date: 2007-03-21
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These literatures suggest improved cycle life

Method used

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  • Nonaqueous electrolyte solution and lithium secondary battery using same
  • Nonaqueous electrolyte solution and lithium secondary battery using same
  • Nonaqueous electrolyte solution and lithium secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] [Preparation of non-aqueous electrolyte solution]

[0128] A non-aqueous solvent of ethylene carbonate (EC): propylene carbonate (PC): ethylmethyl carbonate (MEC) (volume ratio) = 30:5:65 was prepared. By adding LiPF 6Dissolve in this solvent as electrolytic salt to prepare the non-aqueous electrolytic solution that concentration is 1M, then further add 2-butyne-1,4-diol diformate to the non-aqueous electrolytic solution in an amount of 0.1% by weight in the electrolyte.

[0129] [Production of lithium secondary batteries and measurement of battery characteristics]

[0130] 94 wt% LiCoO 2 (positive electrode active material), 3% by weight of acetylene black (conductive material), and 3% by weight of polyvinylidene fluoride (binder) were mixed. 1-Methyl-2-pyrrolidone solvent was added to the mixture and mixed. The resulting mixture was coated on an aluminum foil, which was dried, press-molded, and heated to prepare a positive electrode. Make the spacing (d 002 ) o...

Embodiment 2-4

[0133] In addition to using 2-butyne-1,4-diol formate as an additive in an amount of 0.5% by weight, 1% by weight and 5% by weight of the nonaqueous electrolyte, the nonaqueous electrolyte was prepared in a manner similar to Example 1. Electrolyte, produce 18650 size cylindrical battery and repeat charge and discharge cycle. The results are shown in Table 1.

Embodiment 5-14

[0135] In addition to the use of phenyl formate, biphenyl formate, 4-cyclohexylphenyl formate, pentafluorophenyl formate, ethylene glycol diformate, ethylene glycol acetate formate, 2-butene-1,4- Diol ester, 2,5-dimethyl-3-hexyne-2,5-diol dicarboxylate, 2,4-hexadiyn-1,6-diol dicarboxylate and trimethylol tricarboxylate Except that ethylene was used as an additive in an amount of 1% by weight of each nonaqueous electrolyte, nonaqueous electrolytes were prepared in a manner similar to Example 1, a cylindrical battery of 18650 size was produced, and charge and discharge cycles were repeated. The results are shown in Table 1.

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Abstract

Disclosed is a lithium secondary battery which is excellent in cycle characteristics, battery capacity and battery characteristics such as storage characteristics. A nonaqueous electrolyte solution for lithium secondary batteries wherein an electrolyte salt is dissolved in a nonaqueous solvent is characterized in that a formate compound having a specific structure is contained in the nonaqueous electrolyte solution in an amount of 0.01-10 weight% relative the nonaqueous electrolyte solution. A lithium secondary battery uses such a nonaqueous electrolyte solution.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution and a lithium secondary battery using the nonaqueous electrolytic solution, and more particularly to a nonaqueous lithium secondary battery capable of providing excellent battery characteristics such as battery cycle performance, electric capacity and storage performance. An electrolytic solution, and relates to a lithium secondary battery using the nonaqueous electrolytic solution. Background technique [0002] In recent years, lithium secondary batteries have been widely used as driving power sources for small electronic devices and the like. Such a lithium secondary battery is mainly composed of a positive electrode, a non-aqueous electrolyte, and a negative electrode, and specifically, in which a lithium composite oxide such as LiCoO 2 is used as the positive electrode and carbon material or lithium metal is used as the negative electrode. Non-aqueous electrolytic solutions used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/0525H01M10/0567
CPCY02E60/122Y02E60/10
Inventor 安部浩司三好和弘桑田孝明
Owner UBE IND LTD
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