Sulfide solid electrolyte

A technology of solid electrolytes and sulfides, applied in solid electrolytes, sulfide conductors, non-aqueous electrolytes, etc., can solve the problems of smaller contact area, destruction of active material particles, and insufficient formation of ion paths, etc., and achieve high capacitance maintenance rate Effect

Active Publication Date: 2020-04-10
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when sulfide solid electrolyte particles are pressurized to form a solid electrolyte layer (compression molding), since the particles are difficult to deform, the contact area between the particles becomes small, and the formation of ion paths may be possible. become inadequate
In addition, when forming an electrode layer, the active material particles used may be destroyed when mixed with sulfide solid electrolyte particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0159] Hereinafter, the present invention will be described in more detail based on examples.

[0160] In addition, the evaluation method is as follows.

[0161] (1) Volume reference average particle size (D 50 )

[0162] Measurement was performed using a laser diffraction / scattering particle size distribution measuring device (LA-950V2 model LA-950W2 manufactured by Horiba, Ltd.).

[0163] A mixture of dehydration-treated toluene (manufactured by Wako Pure Chemical Industries, special grade) and t-butanol (manufactured by Wako Pure Chemical Industries, special grade) at a weight ratio of 93.8:6.2 was used as a dispersion medium. After injecting 50 mL of the dispersion medium into the flow cell of the device and circulating it, the object to be measured was added, subjected to ultrasonic treatment, and then the particle size distribution was measured. In addition, the addition amount of the measurement object is based on the measurement screen specified by the device, the r...

manufacture example 1

[0238] (lithium sulfide (Li 2 S) Manufacture)

[0239] Into a 500 mL separable flask equipped with a stirrer, 200 g of anhydrous LiOH (manufactured by Honjo Chemical Co., Ltd.) dried under an inert gas was charged. The temperature was raised under nitrogen flow and the internal temperature was maintained at 200°C. Nitrogen gas was switched to hydrogen sulfide gas (Sumitomo Seika Chemicals), and lithium hydroxide anhydrate (LiOH) was reacted with hydrogen sulfide at a flow rate of 500 mL / min.

[0240] The water produced by the reaction is condensed and recovered by a condenser. 144 ml of water was recovered at the time point after allowing the reaction to proceed for 6 hours. Further, the reaction was continued for 3 hours, but generation of water was not observed.

[0241] The product powder was recovered, and its purity and XRD were measured. As a result, the purity was 98.5%, and Li 2 The peak spectrum of S.

Embodiment 1

[0243] (1) Manufacture of sulfide solid electrolyte (precursor) with argentite-type crystal structure

[0244] Li that will be produced in Production Example 1 2 S, phosphorus pentasulfide (P 2 S5 : FS SPEC, manufactured by Thermphos, with a purity of 99.9% or more) and lithium chloride (LiCl: manufactured by Sigma-Aldrich, with a purity of 99%) in molar ratio (Li 2 S:P 2 S 5 : LiCl) in a ratio of 19:5:16 to prepare a mixture of starting materials (in all examples below, the purity of each starting material is the same). 200 g of the mixture and 1780 g of zirconia balls with a diameter of 20 mm were placed in a SUS container (capacity 6 L). The container was installed in a vibrating mill (Central Chemical Machinery MD-3), and by applying mechanical energy (mechanical grinding treatment), a white-yellow powder glass (intermediate body) was obtained. The treatment conditions of the vibratory mill were set at a temperature of 40° C. at 1500 revolutions / second for 120 hours u...

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Abstract

A purpose of the present invention is to provide a sulfide solid electrolyte with which it is possible to obtain a lithium-ion cell having a high capacity retention rate. The present invention pertains to a sulfide solid electrolyte containing lithium, phosphorus, and sulfur. The sulfide solid electrolyte has, in powder X-ray diffraction in which CuK alpha radiation is used, a diffraction peak A at 2 theta = 25.2 + / - 0.5 deg and a diffraction peak B at 29.7 + / - 0.5 deg. The area ratio, in relation to the total area of a glass-derived peak observed by solid 31P-NMR measurement, of a PS4 3-glass-derived peak is 90-100%, and the area ratio of the glass-derived peak in relation to the total area of all peaks in 60-120 ppm observed by solid 31P-NMR measurement is 1-45%.

Description

technical field [0001] The invention relates to a sulfide solid electrolyte. Background technique [0002] In recent years, with the rapid spread of information-related equipment such as computers, video cameras, and mobile phones, and communication equipment, the development of batteries used as their power sources has also been emphasized. Among batteries, lithium-ion batteries are attracting attention from the viewpoint of high energy density. [0003] Since currently commercially available lithium-ion batteries use electrolyte solutions containing flammable organic solvents, it is necessary to install safety devices that suppress temperature rise during short circuits or to improve structures and materials for preventing short circuits. On the other hand, there is a lithium-ion battery in which the electrolyte is changed to a solid electrolyte and the battery is fully solidified. Since no flammable organic solvent is used in the battery, the safety device can be simplif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562C01B25/14H01B1/06H01B1/10H01M4/13H01M4/62H01M10/052
CPCH01M4/62H01M10/0562C01B25/14H01B1/06H01B1/10H01M10/0525H01M2300/0068C01P2002/74C01P2002/86H01M10/484Y02E60/10H01M10/653H01M4/1315
Inventor 宇都野太津野利章寺井恒太佐藤淳
Owner IDEMITSU KOSAN CO LTD
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