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Lithium ion secondary battery

A secondary battery, lithium ion technology, applied in the field of non-aqueous electrolyte batteries, can solve the problems of cathode deterioration, attacking lithium-nickel composite oxides, etc., to achieve the effect of preventing deterioration and improving cycle characteristics

Active Publication Date: 2017-01-11
ENVISION AESC JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It is known that if MMDS is used together with a positive electrode active material containing a lithium-nickel composite oxide containing nickel in a high-temperature environment, the MMDS will attack the lithium-nickel composite oxide and may degrade the positive electrode.

Method used

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Embodiment

[0032]

[0033] As the negative electrode active material, a 3.4m 2 / g graphite powder with BET specific surface area. The graphite powder, as a conductive additive, has a 62m 2 Carbon black powder (hereinafter referred to as "CB") with a BET specific surface area of ​​ / g, carboxymethylcellulose (hereinafter referred to as "CMC") as a binder resin, and styrene-butadiene copolymer latex (hereinafter referred to as referred to as "SBR") was mixed at a ratio of solid component mass ratio CB:CMC:SBR=0.3:1.0:2.0. After adding the obtained mixture to ion-exchanged water, it stirred with ion-exchanged water. Thus, a slurry comprising the material uniformly dispersed in water was prepared. The obtained slurry was coated on a copper foil having a thickness of 10 μm as a negative electrode current collector. Next, water was evaporated by heating the electrode at 125°C for 10 minutes. Thus, a negative electrode active material layer was formed. In addition, a negative electrode h...

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Abstract

Provided is a lithium ion secondary battery including: a positive electrode; a negative electrode; a separator; and an electrolyte solution, the electrolyte solution including an additive A containing sulfur, and at least one of a cyclic carbonate additive B which is different from the additive A and which has an unsaturated bond and a cyclic carbonate additive C which is different from the additives A and B and which has a halogen. A molar ratio of the additive A relative to a total molar amount of the additive A, the additive B, and the additive C is smaller than a total of a molar ratio of the additive B and a molar ratio of the additive C relative to the total molar amount.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority of Japanese Patent Application No. 2015-131993 submitted to the Japan Patent Office on June 30, 2015, and therefore the entire content of said Japanese Patent Application is incorporated herein by reference. technical field [0003] The invention relates to a nonaqueous electrolyte battery, in particular to a lithium ion secondary battery. Background technique [0004] Non-aqueous electrolyte batteries have been put into practical use as batteries for automobiles including hybrid cars and electric cars. A lithium ion secondary battery is used as the battery for such an on-vehicle power supply. Lithium-ion secondary batteries are required to combine various characteristics such as output characteristics, energy density, capacity, life, and high-temperature stability. In particular, in order to improve battery life (ie, cycle characteristics), various improvements have been made to ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M4/505H01M4/525H01M10/0413H01M10/4235H01M2300/0025Y02E60/10Y02P70/50H01M4/0404H01M4/043H01M4/0471H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/587H01M4/622H01M4/623H01M4/625H01M4/661H01M10/0568H01M10/0569H01M10/0585H01M10/446H01M2004/021H01M2004/027H01M2004/028H01M2220/20H01M2300/004H01M50/446
Inventor 中川嵩米原清佳
Owner ENVISION AESC JAPAN LTD
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