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Method for producing anode active material composite, aqueous lithium ion secondary battery, and method for producing aqueous lithium ion secondary battery

A negative electrode active material, secondary battery technology, applied in the direction of active material electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of narrow potential window, active material limitation, etc.

Active Publication Date: 2019-03-26
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional aqueous electrolytes have problems such as a narrow potential window, and there are limitations in active materials that can be used.

Method used

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  • Method for producing anode active material composite, aqueous lithium ion secondary battery, and method for producing aqueous lithium ion secondary battery
  • Method for producing anode active material composite, aqueous lithium ion secondary battery, and method for producing aqueous lithium ion secondary battery
  • Method for producing anode active material composite, aqueous lithium ion secondary battery, and method for producing aqueous lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] 1. Fabrication of Negative Electrode

[0133] Acetylene black (manufactured by Denka Co., Ltd.) and PTFE dispersion (manufactured by Asahi Glass Co., Ltd. AD911E) as the negative electrode active material were mixed so that the solid content ratio (weight ratio) became 7:3, and a dispersant (Nakalai Tesque Co., Ltd. Triton X-100 manufactured by a company), and a slurry was prepared. The obtained slurry was coated on the surface of a graphite sheet (manufactured by Toyo Tanso Co., Ltd.) as a negative electrode current collector. After natural drying, heating at 360°C above the glass transition temperature of PTFE and below the gasification temperature, thereby forming a negative electrode active material layer formed of a composite of acetylene black and PTFE on the surface of the graphite sheet, to obtain negative electrode.

[0134] 2. Manufacturing of batteries

[0135] The obtained negative electrode was used as a working electrode, an Ag / AgCl electrode (saturated...

Embodiment 2

[0139] The activation step was performed on the battery obtained in the same manner as in Example 1. Specifically, between -2V and 0V relative to the reference electrode (in terms of Li / Li + The reference meter was between 1.244V and 3.244V), and 20 cycles of scanning were repeated at 10 mV / s, and the battery was evaluated in the same manner as in Example 1. It should be noted that this activation process is the same as that of the secondary battery at the rate of Li / Li + It is synonymous to repeat 20 cycles of charge and discharge between the reference meter 1.244V and 3.244V. Show the results of the evaluation in Figure 5 .

Embodiment 3

[0141] Batteries were fabricated and evaluated in the same manner as in Example 2, except that the aqueous electrolyte solution was changed to a saturated solution at 25°C. Show the results of the evaluation in Image 6 . In addition, it is specified that a large amount of salt is thrown into water and stirred to dissolve it, and a "saturated solution" is obtained when the amount of added salt and the amount of precipitated salt are in the same state.

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Abstract

Decomposition of an aqueous electrolyte solution when an aqueous lithium ion secondary battery is charged and discharged is suppressed, and the operating voltage of the battery is improved. The aqueous lithium ion secondary battery includes an anode, a cathode, and an aqueous electrolyte solution, the anode including a composite of an anode active material and polytetrafluoroethylene, wherein peaks of the polytetrafluoroethylene at around 1150 cm <-1> and at around 1210 cm <-1> are observed in FT-IR measurement of the composite, but a peak of the polytetrafluoroethylene at around 729 cm <-1> is not observed in Raman spectroscopy measurement of the composite.

Description

technical field [0001] The present application discloses an aqueous lithium ion secondary battery and the like. Background technique [0002] Lithium ion secondary batteries provided with a flammable non-aqueous electrolyte solution have 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 thus has various advantages such as being able to increase the energy density per unit volume. However, conventional aqueous electrolyte solutions have a problem of a narrow potential window, and there are limitations in 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 Document 1 discloses that lithium bis(trifluor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/38B82Y30/00H01M4/02H01M10/36
CPCH01M4/26H01M4/623H01M10/38B82Y30/00H01M4/362H01M4/587H01M4/628H01M4/0471H01M4/139H01M4/366H01M10/36H01M2300/0002H01M4/663Y02E60/10Y02P70/50H01M4/02H01M10/049H01M4/0447H01M4/13H01M2004/027H01M2004/021
Inventor 当寺盛健志西山博史
Owner TOYOTA JIDOSHA KK
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