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Aqueous electrolyte solution and aqueous lithium ion secondary battery

A water-based electrolyte and secondary battery technology, applied in secondary batteries, non-aqueous electrolytes, aqueous electrolytes, etc., can solve problems such as narrow potential window and active material limitation, and achieve higher battery voltage and larger discharge capacity Effect

Inactive Publication Date: 2019-03-05
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional aqueous electrolyte solution has the problem of a narrow potential window, and there are limitations on active materials that can be used.

Method used

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  • Aqueous electrolyte solution and aqueous lithium ion secondary battery
  • Aqueous electrolyte solution and aqueous lithium ion secondary battery
  • Aqueous electrolyte solution and aqueous lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] 5 mol of LiTFSI was dissolved in 1 kg of pure water to obtain a solution (A1).

[0133] 1 mol of LiTFSI was dissolved in 1 kg of an ionic liquid (butyltrimethylammonium-bis(trifluoromethanesulfonyl)imide, BTMA-TFSI) represented by the following formula (2) to obtain a solution (B1).

[0134] Solution (A1) and solution (B1) were mixed at a volume ratio of 1:1 to obtain the aqueous electrolyte solution involved in Example 1.

[0135] [Chem 2]

[0136]

[0137] Butyltrimethylammonium-bis(trifluoromethanesulfonyl)imide

Embodiment 2

[0139] 10 mol of LiTFSI was dissolved in 1 kg of pure water to obtain a solution (A2).

[0140] 1 mol of LiTFSI was dissolved in 1 kg of the ionic liquid represented by the above formula (2) to obtain a solution (B2).

[0141] Solution (A2) and solution (B2) were mixed at a volume ratio of 1:1 to obtain the aqueous electrolyte solution involved in Example 2.

Embodiment 3

[0143] 21 mol of LiTFSI was dissolved in 1 kg of pure water to obtain a solution (A3).

[0144] 1 mol of LiTFSI was dissolved in 1 kg of the ionic liquid represented by the above formula (2) to obtain a solution (B3).

[0145] Solution (A3) and solution (B3) were mixed at a volume ratio of 1:1 to obtain the aqueous electrolyte solution involved in Example 3.

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PUM

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Abstract

Disclosed is an aqueous electrolyte solution that is difficult to be reduced to be decomposed, and that can improve properties of a lithium ion secondary battery when the solution is applied to the battery. The aqueous electrolyte solution for a lithium ion secondary battery includes: water; a lithium ion; a TFSI anion; and a cation that can form an ionic liquid when the cation forms a salt alongwith the TSFI anion in an atmospheric atmosphere, the cation being at least one selected from the group consisting of an ammonium cation, a piperidinium cation, a phosphonium cation, and an imidazolium cation.

Description

technical field [0001] The invention discloses an aqueous electrolyte solution and the like for a lithium ion secondary battery. Background technique [0002] A lithium ion secondary battery having a flammable non-aqueous electrolyte solution has a large number of parts for safety measures, and as a result, there is a problem that the energy density per unit volume of the battery as a whole is reduced. On the other hand, a lithium ion secondary battery provided with a nonflammable aqueous electrolyte solution does not require the safety measures described above, and therefore has various advantages such as being able to increase the energy density per unit volume (Patent Documents 1, 2, etc.). However, conventional aqueous electrolyte solutions have a problem of narrow potential window, and there are limitations on usable active materials and the like. [0003] As one of the means for solving the above-mentioned problems of the aqueous electrolytic solution, Non-Patent Docu...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M10/38
CPCH01M10/36H01M10/38C25C3/02H01M2300/0045H01M4/485H01M2300/0002H01M4/5825Y02E60/10Y02P70/50H01M50/44H01M50/4295H01M4/505H01M4/621H01M4/661H01M2004/027H01M2004/028
Inventor 中山英树陶山博司
Owner TOYOTA JIDOSHA KK
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