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Manufacturing method of negative electrode for aqueous lithium ion secondary battery and manufacturing method of aqueous lithium ion secondary battery

A manufacturing method and secondary battery technology, which are applied in electrode manufacturing, secondary battery, electrochemical treatment of electrodes, etc., can solve the problems of narrow potential window and active material limitation, improve the working voltage, inhibit reduction decomposition, inhibit the The effect of electronic grants

Inactive Publication Date: 2021-07-27
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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  • Manufacturing method of negative electrode for aqueous lithium ion secondary battery and manufacturing method of aqueous lithium ion secondary battery
  • Manufacturing method of negative electrode for aqueous lithium ion secondary battery and manufacturing method of aqueous lithium ion secondary battery
  • Manufacturing method of negative electrode for aqueous lithium ion secondary battery and manufacturing method of aqueous lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0142] 1. Preliminary experiment

[0143] The effect of forming a film on the surface of the negative electrode was confirmed by the following preliminary experiments.

reference example 1

[0145] (manufacture of negative electrode)

[0146] Using graphite sheet as negative electrode 1M LiPF was dissolved in a non-aqueous solvent (EM:DMC:EMC=3:4:3) 6 The resulting nonaqueous electrolyte solution and metal lithium as a counter electrode were used to fabricate a nonaqueous lithium ion secondary battery. Discharge the fabricated battery at 0.1mA to 0.5V at 25°C, and at 0.5V (vs.Li / Li + ) for 10 hours, and then charged to 3 V at 0.1 mA, thereby forming a film on the graphite sheet. The battery is disassembled, the negative electrode is taken out, and the surface of the negative electrode is washed with EMC to remove the residue, and the negative electrode with a film formed on the surface is obtained.

[0147] (Manufacture of aqueous lithium-ion batteries)

[0148] Using the negative electrode with the film formed on the surface as described above, the SUS plate on which gold was vapor-deposited as the counter electrode, the Ag / AgCl electrode as the reference el...

Embodiment 1

[0173] (manufacture of negative electrode)

[0174] The negative electrode slurry comprising negative electrode active material (LTO), conductive additive (carbon black), binding agent (PVdF) in the ratio of 85:10:5 by mass ratio is coated on the negative electrode current collector (the above-mentioned graphite sheet) and dried to obtain a negative electrode. A coating was formed on the obtained negative electrode under the same conditions as in Reference Example 1 to manufacture a negative electrode having a coating on its surface.

[0175] (production of positive electrode)

[0176] The positive electrode active material (LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 ), a conductive additive (carbon black), and a positive electrode slurry of a binder (PVdF) were coated on a positive electrode current collector (Ti foil) and dried to manufacture a positive electrode.

[0177] (Manufacture of water-based lithium-ion secondary batteries)

[0178] Using the negative electrode with the film...

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Abstract

The present invention relates to a method for manufacturing a negative electrode for an aqueous lithium ion secondary battery and a method for manufacturing the aqueous lithium ion secondary battery. Disclosed is a method for producing a negative electrode capable of suppressing decomposition of an aqueous electrolyte when applied to an aqueous lithium ion secondary battery. A method for producing a negative electrode for an aqueous lithium ion secondary battery, comprising a first step of forming a film on the surface of the negative electrode by contacting the negative electrode electrochemically maintained in a reduced state or an oxidized state with a non-aqueous electrolytic solution in which a lithium salt is dissolved , and a second step of washing the above-mentioned negative electrode on which the above-mentioned film is formed on the surface.

Description

technical field [0001] The present application discloses a method for producing a negative electrode for an aqueous lithium ion secondary battery, and the like. 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, lithium ion secondary batteries provided with a nonflammable aqueous electrolyte solution do not require the safety measures described above, and thus have various advantages such as increased energy density per unit volume (Patent Documents 1 to 3, 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-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M10/38H01M4/139H01M4/1391H01M4/485H01M10/36
CPCH01M4/0438H01M10/38H01M4/0452H01M4/485H01M2004/027Y02E60/10Y02P70/50
Inventor 当寺盛健志陶山博司
Owner TOYOTA JIDOSHA KK
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