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Solid electrolyte and method for producing same

A technology for solid electrolytes and manufacturing methods, applied in solid electrolytes, batteries with solid electrolytes, non-aqueous electrolytes, etc., can solve problems such as the deterioration of sulfide solid electrolytes, and achieve the effects of suppressing the generation of hydrogen sulfide and high ion conductivity

Pending Publication Date: 2022-03-18
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Sulfide solid electrolytes are known to degrade with moisture in the air

Method used

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  • Solid electrolyte and method for producing same
  • Solid electrolyte and method for producing same
  • Solid electrolyte and method for producing same

Examples

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Effect test

no. 1 approach

[0036] A method for producing a solid electrolyte according to an embodiment of the present invention includes the following mixing step and heating step, and produces a solid electrolyte having an argentite-type crystal structure.

[0037] Mixing step: a step of mixing raw materials so that lithium (Li), phosphorus (P), sulfur (S), oxygen (O) and halogen (X) satisfy the following formulas (11) to (14).

[0038] 4.8≤Li / P≤5.3...(11)

[0039] 3.8≤S / P≤4.4...(12)

[0040] 0

[0041] 1.0

[0042] (Formula (11) is the molar ratio of Li relative to P, formula (12) is the molar ratio of S relative to P, formula (13) is the molar ratio of O relative to P, formula (14) is the relative molar ratio of halogen (X) to the molar ratio of P.)

[0043] Heating step: a step of heating the mixture obtained in the mixing step.

[0044] In the present embodiment, it is presumed that by adjusting the composition of the starting material to formulas (11) to (14), s...

no. 2 approach

[0110] The solid electrolyte of the present embodiment has an argentite-type crystal structure including lithium (Li), phosphorus (P), sulfur (S), oxygen (O) and halogen (X) as constituent elements, and Li in the solid electrolyte 3 PO 4 The ratio of the crystal structure to the total crystals is not less than 0.1% by mass and not more than 3.0% by mass, and the solid electrolyte satisfies the following formulas (21) to (23).

[0111] 4.8≤Li / P≤5.3...(21)

[0112] 3.8≤S / P≤4.4...(22)

[0113] 1.0

[0114] (Formula (21) is the molar ratio of Li relative to P, formula (22) is the molar ratio of S relative to P, and formula (23) is the molar ratio of halogen (X) relative to P.)

[0115] The above formulas (21) to (23) preferably satisfy the following formulas.

[0116] 4.85≤Li / P≤5.25

[0117] 3.9≤S / P≤4.3

[0118] 1.2≤X / P≤1.9

[0119] More preferably, the above formulas (21) to (23) satisfy the following formulas.

[0120] 4.9≤Li / P≤5.2

[0121] 4.0≤S / P≤4.2

...

Embodiment

[0154] Hereinafter, the present invention will be described in more detail based on examples.

[0155] In addition, the evaluation method is as follows.

[0156] (1) Hydrogen sulfide (H 2 S) production volume

[0157] The schematic diagram of the test device is shown in figure 1 shown.

[0158] The main components of the test device 1 are as follows: a flask 10 for humidifying nitrogen; a static mixer 20 for mixing humidified nitrogen and non-humidified nitrogen; a dew point meter 30 (M170 / DMT152 manufactured by VAISALA Corporation) for measuring the mixed nitrogen double reaction tube 40, set the measurement sample; dew point meter 50, measure the moisture content of the nitrogen gas discharged from the double reaction tube 40; hydrogen sulfide meter 60 (model 3000RS manufactured by AMI Corporation), measure The concentration of hydrogen sulfide is determined, and these constituent elements are connected by pipes (not shown). The temperature of the flask 10 was set to 10...

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Abstract

The present invention relates to a method for producing a solid electrolyte having an argyrodite crystal structure, the method comprising: a mixing step for mixing raw materials such that lithium (Li), phosphorus (P), sulfur (S), oxygen (O), and halogen (X) satisfy formulae (11)-(14); and a heating step for heating the mixture obtained in the mixing step. 4.8 < = Li / P < = 5.3 (11) 3.8 < = S / P < = 4.4 (12) 0 < O / P < = 0.8 (13) 1.0 < X / P < = 2.0 (14) (formula (11) is the molar ratio of Li to P, formula (12) is the molar ratio of S to P, formula (13) is the molar ratio of O to P, and formula (14) is the molar ratio of halogen (X) to P).

Description

technical field [0001] The invention relates to a solid electrolyte and a manufacturing method thereof. Background technique [0002] It is known that sulfide solid electrolytes are degraded by moisture in the air. In this regard, for example, Patent Document 1 discloses a solid electrolyte characterized by containing Li 7- a P.S. 6-a Ha a (Ha represents halogen, a is 0.2<a≤1.8) and Li 3 P.S. 4 , in the X-ray diffraction pattern measured by X-ray diffraction (XRD), appears in the 3 P.S. 4 The ratio of the peak intensity at the position of diffraction angle 2θ = 26.0 to 28.8° to the peak intensity at the position of diffraction angle 2θ = 24.9 to 26.3° derived from the argonite type crystal structure is 0.04 to 0.3. Patent Document 2 discloses a sulfide solid electrolyte in which a basic compound is mixed, and the ratio of the molar amount of the alkali metal contained in the basic compound to the molar amount of Li contained in the solid electrolyte is 1 More tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562
CPCH01M10/0562C01B25/14H01B1/10Y02E60/10H01M2300/0068H01M10/052H01B13/00C01P2002/70
Inventor 金原弘成户塚翔太佐藤淳增田直也八百笃史
Owner IDEMITSU KOSAN CO LTD
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