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Nonaqueous electrolytic secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problem that the high temperature cycle characteristics of nickel-cobalt-manganese composite oxide cannot be fully improved, and achieve excellent high-temperature cycle characteristics and high temperature. The effect of voltage and high capacity

Inactive Publication Date: 2011-04-27
SANYO ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on this situation, the high-temperature cycle characteristics of lithium-containing nickel-cobalt-manganese composite oxides cannot be sufficiently improved only by adjusting the amount of alkali used in the synthesis reaction.

Method used

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Embodiment Construction

[0017] By clarifying various experimental batteries (No. 1 to 28, No. 30 to 32, No. 40 to 43, and No. 50 to 54) including the non-aqueous electrolyte secondary batteries of the present invention and their high temperature cycle retention rates (% ) to describe the mode for implementing the present invention.

[0018] In order to clarify the technical content of the mode for carrying out the present invention, the above-mentioned experimental example batteries Nos. 1 to 28 are divided into a first experimental group, and experimental example batteries No. 30 to 32 are divided into a second experimental group. Experimental example battery No. 40 to 43 were divided into the third experimental group, and experimental example battery Nos. 50 to 54 were divided into the fourth experimental group. In addition, in the first experimental group, the cathode active material [LiNi a Co b Mn c O 2 The relationship between the element composition ratio of ] and the high temperature cycl...

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Abstract

The present invention provides a non-aqueous electrolyte secondary cell that has high voltage, high capacity and excellent high-temperature cycle characteristics at a low cost. The non-aqueous electrolyte secondary cell according to the present invention is characterized by that: the positive electrode active material is LiNiaCobMncO2 (wherein, a+b+c=1, 0.3<=a<=0.6, 0.3<=b<=0.6, 0.1<=c<=0.4) containing 0.4 mass % or less of a water-soluble alkali; the non-aqueous electrolyte contains LiPF6 as a main electrolyte salt and 0.01 mass % or more and 0.5 mass % or less of LiBF4; and the non-aqueous electrolyte further contains 1.5 to 5 mass % of vinylene carbonate.

Description

technical field [0001] The present invention relates to an improvement in a non-aqueous electrolyte secondary battery using a lithium-containing nickel-cobalt-manganese composite oxide capable of intercalating and deintercalating lithium ions as a positive electrode active material. Background technique [0002] Lithium cobaltate capable of intercalating and deintercalating lithium ions is highly useful as a positive electrode active material for non-aqueous electrolyte secondary batteries. However, the reserves of cobalt are very small, and thus there are constraints on resources. [0003] Compared with lithium cobalt oxide, nickel-cobalt-manganese composite oxide containing lithium can reduce the amount of cobalt used, and has the characteristics of high voltage and high capacity, so it is expected to be used as a positive electrode active material that can replace lithium cobalt oxide. [0004] However, the nickel-cobalt-manganese composite oxide containing lithium has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/131H01M10/056H01M4/525H01M4/505
CPCY02E60/122H01M10/0568H01M4/587H01M4/505H01M10/0525H01M10/0569H01M4/525Y02E60/10
Inventor 宫崎晋也千叶毅石田谦太
Owner SANYO ELECTRIC CO LTD
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