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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of gas escape, battery performance degradation, acceleration, etc., to achieve impact stability, deformation resistance strength The effect of improving and excellent high temperature cycle characteristics

Inactive Publication Date: 2014-11-26
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a non-aqueous electrolyte secondary battery having a laminated electrode body in which large-area positive electrode plates and negative electrode plates are laminated with separators interposed, gas generated due to decomposition of the electrolytic solution or the like is difficult to escape from the electrodes. The inside of the body escapes to the outside
Therefore, the charge-discharge reaction becomes non-uniform, and there arises a problem of accelerated degradation of battery performance accompanying the charge-discharge cycle.
[0005] In the case of a wound-type electrode body in which the elongated positive electrode plate and negative electrode plate are wound with the separator in between, the electrode body is easily damaged due to the expansion and contraction of the electrode body caused by charge and discharge. Slack or deflection occurs, and the gas generated inside the electrode body easily escapes to the outside of the electrode body

Method used

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Examples

Experimental program
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Embodiment 1

[0039]

[0040] 94% by mass of Li as the positive electrode active material 1.10 (Ni 0.3 co 0.4 mn 0.3 )O 2 , 3% by mass of carbon black as a conductive agent, 3% by mass of polyvinylidene fluoride (PVdF) as a binder, and a solution of N-methyl-2-pyrrolidone (NMP) as a solvent to prepare Positive electrode mixed slurry. This positive electrode mixed slurry was coated on both surfaces of an aluminum foil (thickness: 20 μm) serving as a positive electrode core by a doctor blade method. Then, remove the solvent by heating, compress with a roller to a thickness of 0.2mm, and then, as Figure 2A As shown, cutting was performed so that the width would be L1 = 150 mm, and the height would be L2 = 150 mm, to manufacture a positive electrode plate 2 having positive electrode active material layers 2 a on both surfaces. At this time, the positive electrode core body without the positive electrode active material layer 2a protruding from the end of the positive electrode plate 2 ...

Embodiment 2

[0054] As a non-aqueous electrolyte, LiPF was dissolved at a concentration of 1.2 mol / L in a non-aqueous solvent in which EC and DEC were mixed at a volume ratio of 20:80. 6 , and added a non-aqueous electrolytic solution of 3.0% by mass of VC relative to the non-aqueous solvent, a lithium-ion battery was manufactured in the same manner as in Example 1, as a lithium-ion battery of Example 2.

Embodiment 3

[0056] As a non-aqueous electrolyte, LiPF was dissolved at a concentration of 1.2 mol / L in a non-aqueous solvent in which EC, DEC, and methyl ethyl carbonate (MEC) were mixed at a volume ratio of 30:49:21. 6 , and a non-aqueous electrolytic solution with 3.0% by mass of VC relative to the non-aqueous solvent was added, and a lithium ion battery was manufactured in the same manner as in Example 1, as a lithium ion battery of Example 3.

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Abstract

[Problem] To obtain a high-capacity non-aqueous electrolyte secondary battery having superior high-temperature cycling characteristics. [Solution] The non-aqueous electrolyte secondary battery is provided with: a laminated electrode body resulting from laminating a large-area cathode plate and anode plate with a separator therebetween, and a non-aqueous electrolyte containing a non-aqueous solvent. The cathode plate contains as the cathode active material a lithium transition metal complex oxide represented by Lia(NibCocMnd)MeO2 (where 1.05 <= a <= 1.20, 0.3 <= b <= 0.6, b+c+d = 1, 0 <= e <= 0.05, and M is at least one element selected from the group consisting of Ti, Nb, Mo, Zn, Al, Sn, Mg, Ca, Sr, Zr, and W), the percentage of chain carbonates contained in the non-aqueous solvent is at least 50 vol% of the non-aqueous solvent, and the percentage of diethyl carbonate contained in the chain carbonates is at least 70 vol% of the chain carbonates.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery having a laminated electrode body. Background technique [0002] In recent years, nonaqueous electrolyte secondary batteries typified by lithium ion secondary batteries have been widely used as drive power sources for portable electronic devices such as cellular phones, portable personal computers, and portable music players. Moreover, in the context of rising crude oil prices or rising environmental protection movements, electric vehicles (EV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and electric bicycles using non-aqueous electrolyte secondary batteries The development of electric vehicles is actively underway. In addition, medium and large non-aqueous electrolyte secondary batteries are being developed as secondary batteries used in large-scale power storage systems for storing late-night electric energy or solar-generated electric energy. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M2/02H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0567H01M10/0569H01M50/105H01M50/107
CPCH01M4/525H01M10/0569H01M4/485H01M4/505H01M2300/0037Y02E60/122H01M50/105H01M50/107H01M10/0413H01M10/0525H01M2220/20H01M2300/0028Y02E60/10Y02P70/50H01M4/502H01M4/523
Inventor 宫崎晋也堂上和范谷祐儿
Owner SANYO ELECTRIC CO LTD
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