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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte storage batteries, secondary batteries, battery electrodes, etc., can solve the problem of deterioration of charging and storage characteristics, and achieve the effect of improving charging and storage characteristics

Inactive Publication Date: 2005-02-09
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is to solve the problem of deterioration of charging and storage characteristics at high temperature which cannot be suppressed in the case of using a conventional positive electrode when γ-butyrolactone is used as a solvent in an amount of 10% by volume or more.

Method used

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Examples

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Embodiment 1

[0034] [Production of positive electrode active material]

[0035] Li 2 CO 3 、Co 3 o 4 with ZrO 2 And MgO is mixed with the ratio of Li: Co: Zr: Mg molar ratio of 1: 0.99: 0.005: 0.005, and then pulverized after heat treatment at 850 ° C for 24 hours in the air atmosphere to obtain a layered structure with an average particle size of 13.5 μ m. Lithium-containing transition metal oxides are used as positive electrode active materials. The positive electrode active material contains the IVB group element zirconium (Zr) and the IIA group element magnesium (Mg) in equimolar amounts. Furthermore, when the total amount of the transition metal, zirconium, and magnesium in the positive electrode active material is taken as 100 mol%, the total amount of zirconium and magnesium is 1 mol%. The positive electrode active material is called "lithium cobaltate containing Zr and Mg". In addition, the BET specific surface area of ​​the positive electrode active material is 0.38m 2 / g. ...

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Abstract

A non-aqueous electrolyte secondary battery has a positive electrode containing a positive electrode active material composed of a lithium-containing transition metal oxide containing lithium and cobalt, a negative electrode, and a non-aqueous electrolyte solution composed of a solute and a solvent. The solvent contains 10 volume % or more of gamma-butyrolactone with respect to the total solvent, and the positive electrode active material contains a Group IVA element and a Group IIA element of the periodic table.Storage performance in a charged state is improved in a non-aqueous electrolyte battery that contains 10 volume % or more of gamma-butyrolactone, which is highly safe and reliable, as a solvent.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery, and in more detail relates to the improvement of the safety and preservation characteristics of the non-aqueous electrolyte battery. Background technique [0002] In recent years, as batteries with high energy density, alloys that can store and release metal lithium or lithium ions, or carbon materials, etc. are used as negative electrode active materials, and the chemical formula: LiMO 2 (M is a transition metal) non-aqueous electrolyte secondary battery containing a lithium transition metal oxide as a positive electrode active material has attracted people's attention. As a solvent constituting the electrolytic solution, cyclic carbonates represented by ethylene carbonate or propylene carbonate, or cyclic esters represented by γ-butyrolactone, or dimethyl carbonate or ethyl methyl carbonate can be used. Esters represent one or a mixture of chain carbonates. In particular,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/525H01M4/62H01M10/05H01M10/052H01M10/0569
CPCY02E60/122H01M10/0569H01M4/525H01M10/052H01M4/131Y02E60/10H01M10/05H01M10/0525
Inventor 小笠原毅柳田胜功柳井敦志喜田佳典能间俊之
Owner SANYO ELECTRIC CO LTD
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