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Lithium secondary battery

A lithium secondary battery and current collector technology, applied in the direction of secondary batteries, lithium storage batteries, battery electrodes, etc., to achieve the effects of small swelling, good charge-discharge cycle characteristics, and high capacity

Inactive Publication Date: 2013-04-10
HITACHI MAXELL ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiCoO 2 It is manufactured using the rare metal cobalt (Co) as a raw material, so it is expected that the shortage of resources will become serious in the future

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] The first lithium secondary battery of the present invention includes a positive electrode, a negative electrode, a nonaqueous electrolytic solution, and a separator. In addition, the above-mentioned positive electrode includes a current collector and a positive electrode mixture layer formed on the above-mentioned current collector, the above-mentioned positive electrode mixture layer contains a positive electrode active material, and the above-mentioned positive electrode active material contains a first lithium-containing composite oxide containing lithium and nickel. The molar ratio of the nickel to the lithium in the entire amount of the first lithium-containing composite oxide is 0.05 to 1.05. Moreover, the said non-aqueous electrolytic solution contains 0.5-20 mass % of the phosphonoacetate compound represented by following general formula (1).

[0035]

[0036] In the above general formula (1), R 1 , R 2 and R 3 Each independently represents an alkyl group...

Embodiment 1－1

[0217]

[0218] Aqueous ammonia whose pH was adjusted to about 12 by the addition of sodium hydroxide was added to the reaction vessel, and while it was vigorously stirred, the 3 / min, 6.6cm 3 The ratio of 2.4mol / dm / min is added dropwise using a quantitative pump 3 , 0.8mol / dm 3 , 0.8mol / dm 3The concentration contains a mixed aqueous solution of nickel sulfate, cobalt sulfate and manganese sulfate, and ammonia water at a concentration of 25% by mass to synthesize a co-precipitation compound (spherical co-precipitation compound) of Ni, Co and Mn. At this time, the temperature of the reaction solution was maintained at 50°C. In addition, in order to maintain the pH of the reaction solution at around 12, a 6.4mol / dm 3 Concentration of sodium hydroxide aqueous solution is added dropwise. In addition, in order to react in an inert atmosphere, 1dm 3 Nitrogen is blown in at a flow rate of / min.

[0219] The above coprecipitated compound was washed with water, filtered and drie...

Embodiment 1－2

[0241] A lithium secondary battery was produced in the same manner as in Example 1-1, except that triethylphosphonoacetate was added to the non-aqueous electrolytic solution in such an amount that the concentration became 0.5% by mass.

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Abstract

The lithium secondary battery of the present invention is provided with a positive electrode, a negative electrode, a nonaqueous electrolyte, and a separator, and is characterized by: the positive electrode including a current collector and a positive electrode mixture layer formed on top of the current collector; the positive electrode mixture layer including a positive electrode active material; the positive electrode active material including a lithium-containing complex oxide containing lithium and nickel; the molar ratio of lithium to nickel in the total volume of the lithium-containing complex oxide being 0.5-1.05%; and the nonaqueous electrolyte including 0.5-20% by weight of a phosphonoacetate compound represented in Formula (1). In Formula (1), R1, R2 and R3 all independently represent C1-12 alkyl groups that can be substituted with halogen atoms, and n represents an integer of 0 to 6.

Description

technical field [0001] The present invention relates to a lithium secondary battery with high capacity and good charge-discharge cycle characteristics and storage characteristics. Background technique [0002] In recent years, with the development of portable electronic devices such as mobile phones and notebook personal computers, and the practical use of electric vehicles, small, lightweight and high-capacity secondary batteries and capacitors have become necessary. [0003] In such a lithium secondary battery, various improvements are continuously being made for the purpose of improving battery characteristics and the like. For example, Patent Document 1 discloses a lithium-ion secondary battery with less gas generation, high capacity, and excellent storage characteristics and charge-discharge cycle characteristics by adding a specific phosphate-based compound to the non-aqueous electrolyte solution. [0004] In addition, conventionally, lithium cobaltate (LiCoO) used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/13H01M4/131H01M4/133H01M4/36H01M4/48H01M4/505H01M4/525H01M4/587H01M10/0567
CPCH01M4/131H01M4/133H01M4/505H01M4/525H01M4/587H01M10/0525H01M10/0567Y02E60/10H01M10/052H01M10/0566
Inventor 上剃春树御书至松尾和贵川端雄介长冈修一河野聪稻叶章山田将之阿部浩史
Owner HITACHI MAXELL ENERGY LTD
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