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Positive electrode composition for non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte battery electrodes, secondary batteries, battery electrodes, etc., can solve the problems of undisclosed positive electrodes and lithium transition metal composite oxides, and achieve output characteristics and cycle Effects of property improvement and viscosity increase suppression

Active Publication Date: 2017-06-30
NICHIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] None of the above-mentioned Patent Documents 5 to 8 discloses a positive electrode containing tungsten and a lithium-transition metal composite oxide.

Method used

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  • Positive electrode composition for non-aqueous electrolyte secondary battery
  • Positive electrode composition for non-aqueous electrolyte secondary battery
  • Positive electrode composition for non-aqueous electrolyte secondary battery

Examples

Experimental program
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Embodiment 1

[0088] Prepare pure water in a stirred state in the reaction tank, and drop each aqueous solution of nickel sulfate, cobalt sulfate, and manganese sulfate at a flow ratio of Ni:Co:Mn=4:3:3 with the molar ratio of nickel, cobalt, and manganese. add. After the dropwise addition, the temperature of the solution was brought to 50° C., and then an aqueous sodium hydroxide solution was added dropwise quantitatively to obtain a nickel-cobalt-manganese composite hydroxide precipitate. Wash the obtained precipitate with water, filter, separate, and mix with lithium carbonate, tungsten oxide (VI) and zirconium oxide (IV), so that Li: (Ni+Co+Mn):W:Zr=1.07:1:0.004: 0.005 (molar ratio), to obtain mixed raw materials. The obtained mixed raw material was fired at 885° C. for 15 hours in an air atmosphere to obtain a sintered body. The obtained sintered body is pulverized and passed through a dry sieve to obtain the composition formula Li 1.07 Ni 0.4 co 0.3 mn 0.3 W 0.004 Zr 0.005 o ...

Embodiment 2

[0091] Except that the lithium transition metal composite oxide and boric acid (orthoboric acid) are mixed in such a manner that the ratio of the boron element to the lithium transition metal composite oxide is 1.0 mol%, the same operation as in Example 1 is performed to obtain Example 2. positive electrode composition.

Embodiment 3

[0093] In addition to mixing the precipitate of nickel-cobalt-manganese composite hydroxide with lithium carbonate, tungsten oxide (VI) and zirconium oxide (IV), Li: (Ni+Co+Mn):W:Zr=1.21:1:0.004: 0.005 (molar ratio), obtain with composition formula Li 1.21 Ni 0.4 co 0.3 mn 0.3 W 0.004 Zr 0.005 o 2 The cathode composition of Example 3 was obtained in the same manner as in Example 1 except for the lithium transition metal composite oxide shown.

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Abstract

The problem to be solved by the present invention is to improve output characteristics and cycle characteristics when a lithium transition metal composite oxide containing little or no cobalt and containing nickel and tungsten is used in the positive electrode composition. The method for solving the problem is: provide a kind of non-aqueous electrolyte secondary battery positive electrode composition, it comprises: with general formula LiaNi1‑x‑yCoxM1yWzM2wO2 (1.0≤a≤1.5, 0≤x≤0.5, 0≤y≤0.5 , 0.002≤z≤0.03, 0≤w≤0.02, 0≤x+y≤0.7, M1 is at least one selected from Mn and Al, and M2 is selected from Zr, Ti, Mg, Ta, Nb and Mo A lithium transition metal composite oxide represented by at least one of) and a boron compound containing at least boron element and oxygen element.

Description

technical field [0001] The present invention relates to a positive electrode composition for nonaqueous electrolyte secondary batteries such as lithium ion secondary batteries. In particular, the present invention relates to a positive electrode composition in which output characteristics of batteries are improved, cycle characteristics and viscosity stability of positive electrode slurry are also improved. Background technique [0002] In recent years, mobile devices such as VTRs, mobile phones, and notebook computers have become increasingly popular and miniaturized, and non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries have been used as power sources. In addition, from the perspective of recent responses to environmental issues, batteries for electric vehicles and the like are also attracting attention. [0003] As a positive electrode active material for lithium secondary batteries, LiCoO is generally widely used. 2 (Lithium cobaltate)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/48H01M4/52C01B35/12C01G53/00
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10H01M4/13H01M4/38H01M10/056H01M4/36H01M4/362
Inventor 下北晃辅河井健太井内清文
Owner NICHIA CORP
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