Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, batteries, etc., can solve the problems of battery safety reduction, thermal instability, battery heating, etc., and achieve the goal of suppressing the increase of internal resistance Effect

Inactive Publication Date: 2015-11-11
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in the overcharged state, excess lithium is extracted from the positive electrode and excessively inserted into the negative electrode, so that both the positive and negative electrodes are thermally destabilized.
As a result, a rapid exothermic reaction between the positive electrode or the negative electrode and the non-aqueous electrolyte occurs, causing the battery to generate heat and lower the safety of the battery.

Method used

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  • Nonaqueous electrolyte secondary battery
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Examples

Experimental program
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experiment example 1

[0021] A specific method of manufacturing the nonaqueous electrolyte secondary battery of Experimental Example 1 of the present invention will be described below.

[0022] 〔Production of positive electrode plate〕

[0023] Li 2 CO 3 and [Ni 0.35 mn 0.30 co 0.35 ](OH) 2 Mixed and then obtained by heating at 900 °C from Li 1.06 Ni 0.33 mn 0.28 co 0.33 o 2 The lithium nickel cobalt manganese composite oxide shown. 1000 g of the lithium-nickel-cobalt-manganese composite oxide particles were poured into 3 liters of pure water and stirred. Next, a solution in which 4.58 g of erbium nitrate pentahydrate was dissolved was added thereto. At this time, an appropriate amount of 10 mass % sodium hydroxide aqueous solution was added to adjust the pH of the solution containing the lithium nickel cobalt manganese composite oxide to 9. Next, after suction filtration and water washing, the powder obtained after heat treatment at 300° C. for 5 hours in the air was dried to obtain a ...

experiment example 2

[0032] In Experimental Example 2, for the nonaqueous electrolytic solution of Experimental Example 1, instead of CHB, 3-phenylpropyl acetate (PPA) was added as an aromatic compound, and the nonaqueous electrolytic solution was produced in the same manner as in Experimental Example 1 except that liquid. In addition, a potential sweep test was performed in the same manner as in Experimental Example 1, and it was confirmed that the oxidation decomposition potential of PPA was about 4.8Vvs.Li / Li + . Moreover, the nonaqueous electrolyte secondary battery of Experimental Example 2 was produced similarly to Experimental Example 1 except having used the said electrolytic solution.

experiment example 3

[0034] In Experimental Example 3, a nonaqueous electrolyte secondary battery of Experimental Example 3 was produced in the same manner as in Experimental Example 1 except that no aromatic compound was added to the nonaqueous electrolyte solution of Experimental Example 1.

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Abstract

A nonaqueous electrolyte secondary battery (10) according to one embodiment of the present invention is provided with: a positive electrode (11) comprising a positive electrode active material which contains a lithium-containing transition metal oxide, and to the surface of which a compound of a rare earth element adheres; a negative electrode (12); and a nonaqueous electrolyte solution. The nonaqueous electrolyte solution contains an aromatic compound that has an oxidative decomposition potential within the range of 4.2-5.0 V vs. Li / Li+. The compound of a rare earth element is preferably a hydroxide of a rare earth element, an oxyhydroxide of a rare earth element or an oxide of a rare earth element.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile devices such as mobile phones including smartphones and notebook computers has rapidly progressed, and power consumption has also increased along with multifunctionalization. Therefore, there are also strong demands for reduction in weight and high capacity of secondary batteries used as power sources for these devices. In addition, in order to solve environmental problems caused by exhaust gas of vehicles, electric vehicles (EVs) that do not use internal combustion engines, and hybrid electric vehicles (HEVs, PHEVs) that use both internal combustion engines and electric motors are being developed. [0003] As a power source for such applications, nickel-hydrogen storage batteries have been widely used conventionally, but the use of non-aqueous electrolyte secondary batteries has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/36H01M4/505H01M4/525
CPCH01M4/366H01M4/505H01M4/525H01M10/052H01M10/0567Y02E60/122Y02T10/7011H01M4/628Y02E60/10H01M10/0525H01M2220/20H01M2220/30Y02T10/70
Inventor 樋口贵俊新名史治西出太祐藤本洋行
Owner SANYO ELECTRIC CO LTD
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