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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied in secondary batteries, secondary battery charging/discharging, secondary battery repair/maintenance, etc. It can solve the problems of high cobalt price and low resource existence, and achieve the purpose of suppressing battery life. Increased thickness, suppressed side reactions, and improved capacity retention

Inactive Publication Date: 2014-04-16
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of cobalt is high and its existence as a resource is small

Method used

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  • Nonaqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] [Positive electrode active material]

[0047] Lithium nickel cobalt manganate as a positive electrode active material was obtained as follows. As a starting material, lithium hydroxide (LiOH·H 2 O). Co-precipitated hydroxides of nickel, cobalt, and manganese (Ni 0.33 co 0.34 mn 0.33 (OH) 2 ). These were weighed and mixed so that the molar ratio of lithium and a transition metal (nickel, cobalt, and manganese) might become 1:1. The obtained mixture was calcined at 400° C. for 12 hours in an oxygen atmosphere, crushed with a mortar, and then calcined at 900° C. for 24 hours in an oxygen atmosphere to obtain lithium nickel cobalt manganese oxide. This was pulverized with a mortar to an average particle diameter of 15 μm to prepare the positive electrode active material used in this example. Furthermore, the chemical composition of lithium nickel cobalt manganese oxide was measured by ICP (Inductively Coupled Plasma: Inductively Coupled Plasma Luminescence Analysis)...

Embodiment 2 and 3

[0063] In Examples 2 and 3, a nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that the composition ratio of nickel, cobalt, and manganese in nickel-cobalt lithium manganese oxide was changed.

Embodiment 4～6

[0065] In Examples 4 to 6, a mixture obtained by mixing nickel-cobalt lithium manganese oxide and lithium cobalt oxide used in Example 1 or 2 at a given mixing ratio was used as the positive electrode active material, and, in Example 6 , the MoO 3 A non-aqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that the blending amount of the mixture was changed to 0.01% by mass relative to the positive electrode active material.

[0066] Lithium cobaltate as a positive electrode active material was obtained as follows. As a starting material, lithium carbonate (Li 2 CO 3 ). As the cobalt source, tricobalt tetroxide (Co 3 o 4 ). Weigh them and mix them in a mortar so that the molar ratio of lithium to cobalt is 1:1. The resulting mixture was fired at 850° C. for 20 hours in an air atmosphere to obtain lithium cobaltate. The positive electrode active material was produced by pulverizing this in a mortar to an average particle diameter o...

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PUM

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Abstract

The present invention provides a nonaqueous electrolyte secondary battery which has excellent charge and discharge cycle characteristics at high temperatures even in cases where the charging potential is set high. A nonaqueous electrolyte secondary battery of the present invention is characterized by containing at least 1% by mass of lithium nickel cobalt manganese oxide represented by LiNixCoyMn1-x-yO2 (wherein 0.9 <= a <= 1.1, 0 < x < 1, 0 < y < 1 and 2x >= 1 - y) as a positive electrode active material, and is also characterized in that a positive electrode active material mixture layer contains 0.01-3.0% by mass of molybdenum oxide (MoOz, wherein 2 <= z <= 3) relative to the lithium nickel cobalt manganese oxide.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery, in particular to a nonaqueous electrolyte secondary battery excellent in high-temperature cycle characteristics even if the charging voltage is high, and the nonaqueous electrolyte secondary battery contains nickel as a positive electrode active material Lithium cobalt manganate contains molybdenum oxide in the positive electrode active material mixture. Background technique [0002] Non-aqueous electrolyte secondary batteries typified by lithium ion secondary batteries are widely used as drive power sources for portable electronic devices and as power sources for hybrid electric vehicles (HEV) or electric vehicles (EV). [0003] As the positive electrode active material of these non-aqueous electrolyte secondary batteries, LiMO, which can reversibly store and release lithium ions, is used alone or in combination. 2 (where M is at least one of Co, Ni, and Mn), a lithium trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/36H01M4/505H01M4/525H02J7/0052H01M10/0525H01M4/52H01M4/62H01M10/44Y02T10/7011H01M4/364Y02E60/122H01M4/131H01M4/5835Y02E60/10H02J7/00Y02T10/70
Inventor 山本谕
Owner SANYO ELECTRIC CO LTD
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