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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, batteries, etc., can solve problems such as battery explosion, and achieve the effect of improving high-temperature charging and storage characteristics and excellent safety.

Inactive Publication Date: 2011-07-27
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in non-aqueous electrolyte secondary batteries, when the internal pressure of the battery does not rise much, the battery may explode before the safety valve operates due to the heat generated by the rapid temperature rise.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0051] First, a specific manufacturing method of the non-aqueous secondary battery commonly used in Examples 1 to 6 will be described.

[0052] [Production of positive electrode plate]

[0053] First, carbonate is co-precipitated by adding sodium bicarbonate to an aqueous sulfate solution containing Ni, Co, Mn of various compositions as appropriate. Thereafter, a mixture of oxides as raw materials is obtained by subjecting these co-precipitated carbonates to a thermal decomposition reaction. Second, using lithium carbonate (Li 2 CO 3 ) as the initial raw material of the lithium source, the oxide mixture and lithium carbonate were mixed in a mortar, and the obtained mixture was fired in air to synthesize the specified lithium manganese composite oxide (LiMn 2 o 4 ) and fired bodies of lithium-containing nickel-cobalt-manganese composite oxides of various compositions.

[0054] Thereafter, the synthesized fired body was pulverized to an average particle diameter of 10 μm to...

Embodiment 7 and 8

[0068] The battery of embodiment 7 and 8 uses LiNi identical with embodiment 3 1 / 3 co 1 / 3 mn 1 / 3 o 2 : LiMn 2 o 4 =8:2 As the positive active material, the content of the positive active material in the positive electrode mixture is set to 0.1 mass % (embodiment 7) or 5.0 mass % (embodiment 8), in addition, with embodiment 3 Batteries are similarly operated to make.

Embodiment 9 and 10

[0070] The battery of embodiment 9 and 10 uses LiNi identical with embodiment 3 1 / 3 co 1 / 3 mn 1 / 3 o 2 : LiMn 2 o 4 =8:2 As the positive electrode active material, the content of the positive electrode active material and lithium carbonate in the positive electrode mixture is set to the same content as in Example 3, and the content of lithium phosphate in the positive electrode mixture is set to 0.1% by mass ( Example 9) or 5.0% by mass (Example 10), and the battery of Example 3 was produced in the same manner.

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Abstract

Provided is a nonaqueous electrolyte secondary battery using lithium-manganese composite oxide as positive electrode active material, having superior high-temperature charge storage characteristics and charge-discharge cycling characteristics and enhanced safety in the event of overcharging. A nonaqueous electrolyte secondary battery according to an aspect of the invention includes: a positive electrode plate provided with a positive electrode mixture containing positive electrode active material, a negative electrode plate, a nonaqueous electrolyte, and a pressure-sensitive safety mechanism that is actuated by rise in internal pressure. The positive electrode active material contains lithium-manganese composite oxide containing 10 to 61% by mass of the element manganese. The positive electrode mixture contains lithium carbonate or calcium carbonate, and lithium phosphate. The nonaqueous electrolyte contains an organic additive made of at least one selected from among biphenyl, a cycloalkyl benzene compound, and a compound having quaternary carbon adjacent to a benzene ring.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery, in particular to a material containing lithium-manganese composite oxide as a positive electrode active material, which has excellent high-temperature charge storage characteristics and charge-discharge cycle characteristics, and is safe when overcharged Improved non-aqueous electrolyte secondary battery. Background technique [0002] With the popularization of portable devices in recent years, small, lightweight, and high-energy-density sealed batteries are required as power sources for these portable devices. Among sealed batteries, secondary batteries that can be charged and discharged, such as nickel-metal hydride storage batteries and lithium-ion secondary batteries, are often used from the viewpoint of economical efficiency. In particular, non-aqueous electrolyte secondary batteries typified by lithium ion secondary batteries are widely used because they are lighter in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05H01M4/131H01M4/136H01M10/0568H01M10/0567
CPCY02E60/122H01M4/62H01M10/0567H01M10/4235H01M4/364H01M4/505H01M2220/30H01M2200/20H01M4/131Y02E60/12H01M10/0525Y02E60/10Y02P70/50H01M10/05
Inventor 宫崎晋也白方宏宜
Owner SANYO ELECTRIC CO LTD
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