Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte storage batteries, non-aqueous electrolytes, secondary batteries, etc., can solve the problem of unmentioned low-temperature discharge characteristics, insufficient effect, and undocumented low-temperature discharge characteristics. and other problems, to achieve the effect of good low temperature discharge characteristics

Inactive Publication Date: 2005-12-14
GS YUASA INT LTD
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Problems solved by technology

According to this method, low-temperature discharge characteristics can be improved, but the effect is not sufficient for the higher performance requirements of today's batteries, so it is required to develop a method to further improve low-temperature discharge performance
[0009] In addition, in JP-A-10-189042 and JP-A-11-162511, although a method of adding a cyclic sulfuric acid ester to a non-aqueous electrolyte is described, the preferred addition amount for improving low-temperature discharge characteristics is not described.
Moreover, it is not mentioned that when it is mixed with the quantitative ethylene carbonate derivative, better low-temperature discharge characteristics can be obtained

Method used

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  • Nonaqueous electrolyte secondary battery
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preparation example Construction

[0035] The preparation process of the positive plate includes: mixing 8wt% polyvinylidene fluoride binder, 5wt% acetylene black conductive agent, and 87wt% positive electrode active material lithium-cobalt composite oxide to form a positive electrode paste, adding N -methylpyrrolidone to prepare a paste, and then apply this paste to both sides of a 20 μm thick aluminum foil, and then dry to prepare a positive electrode plate.

[0036] The preparation process of the negative plate includes: adding an appropriate amount of water to 95wt% graphite, 2wt% carboxymethyl cellulose and 3wt% styrene-butadiene rubber to make a paste, and then coating the paste to a thickness of 15 μm Both sides of the copper foil are dried to obtain a negative electrode plate.

[0037] A microporous polyethylene film is used as a separator, and the electrolyte used is to dissolve LiPF in a mixed solvent of ethylene carbonate (EC): ethylmethyl carbonate = (EMC) 3:7 (volume ratio) 6Make the solution of 1...

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Abstract

The non-aqueous secondary battery of the present invention is characterized in that it contains at least one kind of vinylene carbonate derivative with a concentration of 0.25wt% or more and 1wt% or less, and at least one kind of cyclic vinylene carbonate derivative with a concentration of 0.25wt% or more and 2wt% or less. Sulfate non-aqueous electrolyte. According to the present invention, a nonaqueous electrolyte secondary battery having good low-temperature discharge characteristics can be obtained.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery. Background technique [0002] Recently, with the rapid miniaturization, portability and diversification of civilian mobile phones, portable devices, and portable information terminals, it is extremely necessary to develop a secondary battery that is small and light, has high energy density, and can be repeatedly charged and discharged for a long time as its power source. secondary battery. Among them, non-aqueous electrolyte secondary batteries such as lithium ion batteries have advantages of small size, light weight, and high energy density compared with lead batteries and nickel-cadmium batteries using aqueous electrolyte solutions, and research is active. [0003] As the positive electrode active material of the non-aqueous electrolyte secondary battery, it includes titanium disulfide, vanadium pentoxide, molybdenum trioxide, cobalt-lithium composite oxide, lithium-nickel ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M10/05H01B1/12H01M10/0567
CPCH01M10/052H01M10/0567H01M10/0569H01M2300/0025H01M2300/0091Y02E60/10Y10T29/49108Y10T29/4911
Inventor森澄男
OwnerGS YUASA INT LTD