Positive pole active matter for non-aqueous electrolyte secondary cell and non-aqueous electrolyte secondary cell

A positive electrode active material, non-aqueous electrolyte technology, applied in the direction of secondary batteries, secondary battery manufacturing, battery electrodes, etc., can solve the problem that it is impossible to obtain cycle characteristics and initial charge and discharge capacity, secondary batteries cannot meet the load characteristics and average Potential and other issues, to achieve the effect of excellent thermal stability

Active Publication Date: 2007-12-12
NICHIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, it is impossible to obtain sufficient cycle characteristics and initial charge-discharge capacity with such a positive electrode active material.
In addition, recent non-aqueous electrolyte secondary batteries cannot meet the required load characteristics and average potential

Method used

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  • Positive pole active matter for non-aqueous electrolyte secondary cell and non-aqueous electrolyte secondary cell
  • Positive pole active matter for non-aqueous electrolyte secondary cell and non-aqueous electrolyte secondary cell
  • Positive pole active matter for non-aqueous electrolyte secondary cell and non-aqueous electrolyte secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0316]Into the stirred pure water, an aqueous cobalt sulfate solution and an aqueous zirconium oxychloride solution having a predetermined composition ratio were added dropwise. An aqueous solution of zirconium oxychloride was added dropwise so that zirconium would be 0.2 mol% relative to cobalt. Continue to add dropwise sodium hydroxide aqueous solution to make the pH 7-7.5, and rotate at 60° C. at 650 rpm to precipitate cobalt and zirconium to obtain a precipitate. The obtained precipitate was filtered, washed with water, heat-treated, mixed with lithium carbonate, and calcined at 995° C. for 7 hours in the air. In this way, a positive electrode active material was obtained.

Embodiment 1-2

[0318] Into the stirred pure water, an aqueous cobalt sulfate solution and an aqueous zirconium oxychloride solution having a predetermined composition ratio were added dropwise. An aqueous solution of zirconium oxychloride was added dropwise so that zirconium would be 0.04 mol % relative to cobalt. Continue to add dropwise sodium hydroxide aqueous solution to make the pH 7-7.5, and rotate at 60° C. at 650 rpm to precipitate cobalt and zirconium to obtain a precipitate. The obtained precipitate was filtered, washed with water, heat-treated, mixed with lithium carbonate, and calcined at 995° C. for 7 hours in the air. In this way, a positive electrode active material was obtained.

Embodiment 1-3

[0320] Into the stirred pure water, an aqueous solution containing cobalt and nickel in a predetermined composition ratio was added dropwise. Continue to add dropwise sodium hydroxide aqueous solution to make the pH 9, and rotate at 80° C. at 650 rpm to precipitate cobalt and nickel to obtain a precipitate. The obtained precipitate was filtered, washed with water, heat-treated, mixed with zirconium oxide and lithium hydroxide, and calcined at about 750° C. for about 10 hours in an atmosphere of controlled oxygen partial pressure. Zirconia was mixed in an amount of 0.03 mol % in terms of zirconium relative to the precipitate. In this way, a positive electrode active material was obtained.

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Abstract

Disclosed is a positive electrode active material for a nonaqueous electrolyte secondary battery having at least a lithium-transition metal composite oxide of a layer structure, in which an existence ratio of at least one selected from the group consisting of elements which may become tetravalent and magnesium is 20% or more on a surface of the lithium-transition metal composite oxide. By use of this positive electrode active material, a nonaqueous electrolyte secondary battery having excellent battery characteristics, specifically, having excellent high rate characteristics, cycle characteristics, low-temperature characteristics, thermal stability, and the like, under the even more harsh environment for use can be realized.

Description

technical field [0001] The present invention relates to a positive electrode active material for nonaqueous electrolyte secondary batteries such as lithium ion secondary batteries. For example, suitable for mobile phones, personal computers, electric cars. Background technique [0002] Non-aqueous electrolyte secondary batteries have higher operating voltage and higher energy density than conventional nickel-cadmium secondary batteries, and are widely used as power sources for portable electrical appliances such as mobile phones, notebook personal computers, and digital cameras. The positive electrode active material of this non-aqueous electrolyte secondary battery can be exemplified by LiCoO 2 , LiNiO 2 , LiMn 2 o 4 Lithium-transition metal composite oxides are represented, however, among them, mobile electrical appliances have previously used LiCoO 2 , to obtain sufficient battery characteristics. [0003] However, at present, since mobile electric appliances are pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/58H01M4/36H01M10/40H01M4/38C01G51/04C01G53/04H01M4/131H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M10/04H01M10/0525H01M10/0587H01M10/36
CPCH01M10/0431H01M4/505Y02E60/122H01M4/525H01M4/485H01M4/131H01M10/0525H01M4/366H01M10/0587C01G51/04C01G51/42C01G53/42C01P2002/52C01P2002/85Y02E60/10Y02P70/50H01M4/38
Inventor 高桥武志大庭刚藤野贤治得野顺一森崎益弘近藤刚行瀬山淳
Owner NICHIA CORP
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