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Lithium secondary cell and its nonaqueous electrolyte

A lithium secondary battery and non-aqueous electrolyte technology, which is applied in secondary batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of unprocessed cycle characteristics, etc.

Inactive Publication Date: 2008-11-05
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, substantive studies such as cycle characteristics have not been carried out

Method used

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  • Lithium secondary cell and its nonaqueous electrolyte
  • Lithium secondary cell and its nonaqueous electrolyte
  • Lithium secondary cell and its nonaqueous electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] [Preparation of non-aqueous electrolyte]

[0063] Prepare a non-aqueous solvent of propylene carbonate (PC): dimethyl carbonate (DMC) (capacity ratio) = 1:2, and dissolve LiPF as an electrolyte salt in it 6 , and make it reach the concentration of 1M, so as to prepare the non-aqueous electrolytic solution, then add dimethyl oxalate and make it reach 0.5% by weight, add vinylene carbonate (VC) and make it reach the non-aqueous electrolytic solution 2% by weight.

[0064] [Production of Lithium Secondary Battery and Measurement of Battery Characteristics]

[0065] LiCoO 2 (positive electrode active material), acetylene black (conductive agent), and polyvinylidene fluoride (binder) are mixed in proportions of 90% by weight, 5% by weight, and 5% by weight, respectively, and 1-methyl-2 -Pyrrolidone solvent and mixed, and the obtained mixture was coated on an aluminum foil, dried, press-molded, and heat-treated to prepare a positive electrode. Will have a crystal plane (0...

Embodiment 2

[0068] As an additive, with respect to the non-aqueous electrolytic solution, 1% by weight of dimethyl oxalate and 2% by weight of vinylene carbonate were used, except that the non-aqueous electrolytic solution was prepared in the same manner as in Example 1, and a 18650 battery was produced and measured. The characteristics of the battery after 200 cycles were checked, and the discharge capacity retention rate was 85.7%. Table 1 shows the fabrication conditions and battery characteristics of the 18650 battery.

Embodiment 3

[0070] As an additive, with respect to the non-aqueous electrolytic solution, 2 weight % of dimethyl oxalate and 2 weight % of vinylene carbonate were used, except that the non-aqueous electrolytic solution was prepared in the same manner as in Example 1, and a 18650 battery was produced and measured. The characteristics of the battery after 200 cycles were examined, and the discharge capacity retention rate was 86.1%. Table 1 shows the fabrication conditions and battery characteristics of the 18650 battery.

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Abstract

A lithium secondary cell exhibiting excellent long term cell characteristics such as cycle characteristics, electric capacity and storage characteristics, and a nonaqueous electrolyte usable in such a lithium secondary cell. The lithium secondary cell comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte produced by dissolving an electrolytic salt into a nonaqueous solvent is characterized in that the positive electrode is a material containing a lithium composite oxide, the negative electrode is a material containing graphite, and the nonaqueous electrolyte contains a dialkyl oxalate, and a vinylene carbonate and / or 1,3-propane sultone.

Description

technical field [0001] The present invention relates to a lithium secondary battery excellent in battery characteristics such as long-term cycle characteristics, electric capacity, and storage characteristics, and a nonaqueous electrolytic solution usable in the lithium secondary battery. Background technique [0002] In recent years, lithium secondary batteries have been widely used as power sources for driving small electronic devices and the like. Lithium secondary batteries are mainly composed of positive electrode, non-aqueous electrolyte and negative electrode, especially LiCoO 2 A lithium secondary battery in which a lithium composite oxide is used as a positive electrode and a carbon material or lithium metal is used as a negative electrode is suitably used. As the nonaqueous electrolytic solution for the lithium secondary battery, carbonates such as ethylene carbonate (EC) and propylene carbonate (PC) are very suitably used. [0003] However, regarding battery cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M4/58H01M4/02H01M4/587H01M10/0525H01M10/0567H01M10/0569
CPCY02E60/122H01M10/052Y02E60/10
Inventor 安部浩司三好和弘桑田孝明松森保男
Owner UBE IND LTD
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