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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problem of not fully utilizing the lithium-containing olivine-type phosphate output regeneration characteristics, conductive agents and binders The problems of large weight ratio and low content of lithium-containing olivine-type phosphate are achieved to suppress the dissolution of Fe, reduce the increase in internal resistance, and improve the effect of reducing output regeneration characteristics

Inactive Publication Date: 2010-05-12
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the weight ratio of conductive agent and binder in the positive electrode mixture is large, and the content of lithium-containing olivine-type phosphate in the positive-electrode mixture is small, and the output regeneration characteristics of lithium-containing olivine-type phosphate cannot be fully utilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] [Production of positive electrode active material]

[0036] LiFePO as lithium-containing olivine-type phosphate was prepared as follows 4 . First, the initial raw material iron phosphate octahydrate (Fe 3 (PO 4 ) 2 ·8H 2 O) and lithium phosphate (Li 3 PO 4 ), the mixture and the pellets made of stainless steel with a diameter of 1cm are dropped into a stainless steel crucible with a diameter of 10cm, at a radius of revolution: 30cm, number of revolutions: 150rpm, number of rotations: 150rpm, running time: Mixed under the condition of 12 hours.

[0037] Next, the obtained mixture was fired at a temperature of 600° C. for 10 hours in an electric furnace in a non-oxidizing atmosphere, thereby obtaining LiFePO 4 .

[0038] LiZr as a lithium-containing transition metal oxide was prepared as follows 0.005 (Ni 0.4 co 0.3 mn 0.3 ) 0.995 o 2 . Mix Li at a molar ratio of 300:199:3 2 CO 3 , (Ni 0.4 co 0.3 mn 0.3 ) 3 o 4 and ZrO 2 , fired at 900°C for 20 hou...

Embodiment 2

[0049] A test battery A2 was prepared in the same manner as in Example 1, except that the lithium-containing olivine-type phosphate and LiZrNiCoMnO prepared above were mixed in a weight ratio of 4:6. 2 .

Embodiment 3

[0051] A test battery A3 was prepared in the same manner as in Example 1, except that the lithium-containing olivine-type phosphate and LiZrNiCoMnO prepared as above were mixed in a weight ratio of 6:4. 2 .

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Abstract

In a non-aqueous electrolyte secondary battery employing an olivine-type lithium phosphate as a positive electrode active material, power regeneration performance is improved. The non-aqueous electrolyte secondary battery for use as a power source for regenerative charging includes: a positive electrode including a mixture layer containing a positive electrode active material, a binder agent, anda carbon material as a conductive agent; a negative electrode; and a non-aqueous electrolyte. The mixture layer contains, as the positive electrode active material, an olivine-type lithium phosphate represented by the formula LiMPO4, where M is at least one element selected from the group consisting of Co, Ni, Mn, and Fe, and the mixture layer further contains a metal oxide such as a lithium-containing transition metal oxide containing at least Ni or Mn.

Description

technical field [0001] The invention relates to a non-aqueous electrolyte secondary battery which uses lithium-containing olivine-type phosphate as a positive electrode active material. Background technique [0002] Compared with lithium cobalt oxide, which has been used as a positive electrode active material in the past, lithium-containing olivine-type phosphate is attracting attention as an inexpensive positive electrode active material because it uses elements such as Fe, Ni, and Mn, which are abundant in resources. However, since the resistance is high, when charging and discharging with a large current, there is a problem that the resistance overvoltage increases, the voltage of the battery decreases, and sufficient output regeneration characteristics cannot be obtained. [0003] In order to solve such a problem, the use of a composite material of lithium-containing olivine-type phosphate and a carbon material as an active material has been studied (Patent Documents 1 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M4/02H01M4/48H01M4/58H01M4/131H01M4/136H01M4/36H01M4/505H01M4/525H01M4/62H01M10/05
CPCH01M4/505H01M4/5825Y02E60/122H01M2004/028H01M4/625H01M4/525Y02T10/7011H01M10/052H01M2004/021H01M4/364H01M10/0525H01M4/485Y02E60/10A47D13/083A47D15/00A47G9/00A47G9/1027A47G2009/003Y02T10/70
Inventor 白方宏宜北尾英树秋田宏之莲见幸治喜田佳典藤原丰树武田和久中西直哉能见俊之
Owner SANYO ELECTRIC CO LTD
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