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Additive for nonaqueous electrolyte solutions, nonaqueous electrolyte solution, and lithium ion secondary battery

A non-aqueous electrolyte and additive technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, non-aqueous electrolytes, etc., can solve the problems of cost increase, low ion conductivity, battery performance deterioration, etc., and improve safety Effect

Pending Publication Date: 2020-11-20
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these materials alone have low ion conductivity and lower battery performance, they need to be used in combination with carbonate-based solvents that are generally used as main solvents in lithium-ion secondary batteries.
These carbonate-based solvents are flammable, so in order to make the non-aqueous electrolyte solution flame-resistant, it is necessary to add a large amount of phosphorus-based materials and ionic liquids. As a result, compared with the case where only carbonate-based solvents are used, battery performance deteriorates. Poor, and the cost also increases

Method used

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  • Additive for nonaqueous electrolyte solutions, nonaqueous electrolyte solution, and lithium ion secondary battery
  • Additive for nonaqueous electrolyte solutions, nonaqueous electrolyte solution, and lithium ion secondary battery
  • Additive for nonaqueous electrolyte solutions, nonaqueous electrolyte solution, and lithium ion secondary battery

Examples

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Effect test

Embodiment 1

[0142] Make LiPF in a carbonate mixed solvent (ethylene carbonate: ethyl methyl carbonate = 1:3 (volume ratio)) 6To the solution obtained by dissolving to 1 mol / L, vinylene carbonate was added to make it 2% by mass and 1-propene-1,3-sultone to be 0.5% by mass, and N-(tert- Butoxycarbonyl)-1,2-phenylenediamine 0.72% by mass to prepare a non-aqueous electrolytic solution.

[0143] The cathode active material (LiCoO 2 , セルシード (registered trademark) C20F, Nippon Chemical Industry Co., Ltd.) 100 parts by mass, conductive agent (acetylene black, DENKA BLACK powder, DENKA Co., Ltd.) 3 parts by mass, binder (polyvinylidene fluoride : PVdF, #7208 (8% NMP solution), 37.5 parts by mass of Kureha) and 13.2 parts by mass of NMP (manufactured by Mitsubishi Chemical Corporation) were mixed to prepare a paste-like positive electrode compound slurry. Next, using a coating device, the positive electrode compound slurry was evenly coated on both sides of a positive electrode current collector ...

Embodiment 2

[0157] Make LiPF in a carbonate mixed solvent (ethylene carbonate: ethyl methyl carbonate = 1:3 (volume ratio)) 6 To the solution obtained by dissolving to 1 mol / L, vinylene carbonate was added to make it 2% by mass and 1-propene-1,3-sultone to be 0.5% by mass, and N-(tert- Butoxycarbonyl)-1,3-phenylenediamine 0.72% by mass to prepare a non-aqueous electrolytic solution.

[0158] The cathode active material (LiCoO 2 , セルシード (registered trademark) C8hV, manufactured by Nippon Chemical Industry Co., Ltd.) 100 parts by mass, conductive agent (acetylene black, DENKA BLACK powder, manufactured by DENKA Co., Ltd.) 3 parts by mass, binder (polyvinylidene fluoride : PVdF, #7208 (8% NMP solution), 37.5 parts by mass of Kureha) and 13.2 parts by mass of NMP (manufactured by Mitsubishi Chemical Corporation) were mixed to prepare a paste-like positive electrode compound slurry. Next, using a coating device, the positive electrode compound slurry was evenly coated on both sides of a posi...

Embodiment 3

[0163] Except having used N-(tert-butoxycarbonyl)-1,4-phenylenediamine as an additive, the sample E for short-circuit tests was produced by the method similar to Example 2.

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Abstract

The present invention provides: an additive for nonaqueous electrolyte solutions, which is composed of a compound that has at least one aromatic ring and no amino group, while having at least one hydrogen atom that is bonded to a carbon atom in an aromatic ring of the compound substituted by a group that is represented by formula (1); and a lithium ion secondary battery which uses this additive for nonaqueous electrolyte solutions. In the formula, Rx represents an optionally substituted monovalent aliphatic hydrocarbon group having 1-60 carbon atoms, an optionally substituted monovalent aromatic hydrocarbon group having 6-60 carbon atoms, or an optionally substituted monovalent heterocyclic ring-containing group having 2-60 carbon atoms; and the broken line represents a bonding hand.

Description

technical field [0001] The present invention relates to an additive for a nonaqueous electrolytic solution, a nonaqueous electrolytic solution and a lithium ion secondary battery. Background technique [0002] In recent years, the development of high-performance batteries and secondary batteries that can be used repeatedly by charging have been actively carried out in response to the demand for smaller, lighter, and more functional portable electronic devices such as smart phones, digital cameras, and portable game consoles. The demand has greatly expanded. Among them, lithium-ion secondary batteries are currently the most intensively developed secondary batteries due to their high energy density, high voltage, and absence of memory effects during charging and discharging. In addition, in response to environmental problems in recent years, development of electric vehicles has been actively carried out, and higher performance has been demanded for secondary batteries serving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/505H01M4/525H01M10/052
CPCH01M10/0567Y02E60/10H01M10/0525H01M4/525H01M2300/0025H01M10/4235C07C271/28H01M4/505H01M10/0569H01M2004/028H01M2300/0037
Inventor 柴野佑纪
Owner NISSAN CHEM IND LTD