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Manufacturing method of non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, non-aqueous electrolytes, etc., can solve the problems of not forming a good surface film, increasing the internal resistance of the battery, and uneven electrode reaction.

Active Publication Date: 2019-03-12
ENVISION AESC JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the method described in Japanese Patent Application Laid-Open No. 2001-325988, when various additives are present in the electrolyte, there are problems that a good surface film cannot be formed, the reaction in the electrode becomes uneven, and the internal resistance of the battery after long-term storage issues such as rising

Method used

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  • Manufacturing method of non-aqueous electrolyte secondary battery
  • Manufacturing method of non-aqueous electrolyte secondary battery
  • Manufacturing method of non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] (1) Production of positive electrode

[0154] Lithium nickel manganese cobalt oxide (95% by weight) as a positive electrode active material, PVdF (2.5% by weight) as a binder, and carbon black (2.5% by weight) as a conductive aid were mixed. The aforementioned mixture was dispersed in NMP to prepare a slurry. The obtained slurry was coated on both surfaces of an aluminum foil (thickness: 20 μm), and dried to obtain a positive electrode. The thickness of the dried positive electrode active material layer was 80 μm.

[0155] (2) Production of negative electrode

[0156] Using graphite (96% by weight) as the negative electrode active material, SBR (0.5% by weight) and CMC (1.5% by weight) as the binder, and carbon black (2% by weight) as the conductive additive, dispersed in water to prepare into slurry. The obtained slurry was applied to both surfaces of a copper foil (10 μm in thickness), and dried to obtain a negative electrode. The thickness of the dried negative ...

Embodiment 2

[0177] A battery was prepared and evaluated in the same manner as in Example 1, except that the following lithium tetrafluorooxalate phosphate (reduction potential: 1.6 V) was added instead of methylene methanedisulfonate as an electrolyte solution additive.

[0178]

Embodiment 3

[0180] A battery was fabricated and evaluated in the same manner as in Example 1, except that the holding voltage in the first charging step was set to 2.3 V (negative electrode potential vs. lithium metal: 1.3 V).

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Abstract

[Problem] Make the reaction in the electrode uniform and suppress the decrease in durability. [Solution] A method of manufacturing a nonaqueous electrolyte secondary battery, which is a method of manufacturing a nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, and an electrolyte comprising an electrolyte salt, a nonaqueous electrolyte capable of dissolving the aforementioned electrolyte salt solvent, and various additives, at least one of the above-mentioned additives has a reduction potential higher than that of the above-mentioned non-aqueous solvent, and the production method has an initial charging process, and the initial charging process includes the following steps: changing the battery voltage to A first charging process of maintaining a negative electrode potential at which the additive having the highest reduction potential among the aforementioned additives is decomposed and the aforementioned non-aqueous solvent and other additives are not reductively decomposed; and, at least one of the aforementioned non-aqueous solvents is kept by Reductive decomposition and the second charging process in which the potential of the negative electrode reaches a battery voltage of 0.7 V or more with respect to lithium.

Description

technical field [0001] The present invention relates to a method for manufacturing a nonaqueous electrolyte secondary battery. Background technique [0002] Nonaqueous electrolyte secondary batteries, especially lithium ion secondary batteries, are widely used as power sources for mobile devices because of their high energy density, high durability, charge and discharge efficiency, and the like. [0003] In recent years, against the background of the upsurge of the environmental protection movement, the use of lithium-ion secondary batteries as power sources for large-scale systems such as electric vehicles and stationary power storage systems is expanding. Batteries used in these power supply applications require improvements in battery characteristics such as larger batteries and higher energy densities in order to realize high production efficiency of these battery performances economically. [0004] For lithium-ion secondary batteries, when the battery is repeatedly cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/052H01M10/0567H01M10/0569H01M50/414
CPCH01M10/052H01M10/0567H01M10/058H01M10/049H01M10/52H01M2300/0025H01M10/446Y02E60/10Y02P70/50H01M50/414Y02T10/70H01M10/44H01M4/0404H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/505H01M4/525H01M4/622H01M4/623H01M4/625H01M4/661H01M10/0525H01M10/0568H01M10/0569H01M10/0585H01M10/4235H01M2004/027H01M2004/028H01M2220/20H01M2220/30H01M2300/0037
Inventor 草地雄树川村文洋青柳成则萩山康介
Owner ENVISION AESC JAPAN LTD