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Sulfide solid electrolyte

A technology of solid electrolytes and sulfides, applied in solid electrolytes, sulfide conductors, non-aqueous electrolytes, etc., can solve problems such as increased reaction resistance and lower battery characteristics

Pending Publication Date: 2021-09-07
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a solid battery including a sulfide solid electrolyte is charged and discharged, the reaction resistance between the active material and the sulfide solid electrolyte increases, and the movement of lithium ions is restricted, resulting in a decrease in battery characteristics. question

Method used

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  • Sulfide solid electrolyte
  • Sulfide solid electrolyte
  • Sulfide solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0059] (1) Manufacture of sulfide solid electrolyte

[0060] to be Li 5.4 P.S. 4.4 Cl 0.8 Br 0.8 Weigh Li by way of composition 2 S powder, P 2 S 5 powder, LiCl powder, and LiBr powder so that the total amount becomes 75 g. These powders were pulverized and mixed using a ball mill to obtain a mixed powder. The mixed powder was fired to obtain a fired product having the above-mentioned composition. Firing was performed using a tubular electric furnace. During firing, hydrogen sulfide gas with a purity of 100% was circulated in the electric furnace at 1.0 L / min. The firing temperature was set to 500° C., and firing was performed for 4 hours. The fired product was pulverized with a mortar and pestle, and then pulverized with a wet bead mill to obtain a sulfide solid electrolyte. Expose the obtained sulfide solid electrolyte to the atmosphere at [dew point -30]°C for 24 hours to generate LiCl·H 2 O and LiBr·H 2 O, the target sulfide solid electrolyte was obtained. In...

Embodiment 7

[0110] to be Li 5.4 P.S. 4.4 Cl 0.8 Br 0.8 Weigh Li by way of composition 2 S powder, P 2 S 5 powder, LiCl powder, and LiBr powder so that the total amount becomes 75 g. These powders were pulverized and mixed using a ball mill to obtain a mixed powder. The mixed powder was fired to obtain a fired product having the above-mentioned composition. Firing was performed using a tubular electric furnace. During firing, hydrogen sulfide gas with a purity of 100% was circulated in the electric furnace at 1.0 L / min. The firing temperature was set to 500° C., and firing was performed for 4 hours. The fired product was pulverized with a mortar and pestle, and then pulverized with a wet bead mill to obtain a sulfide solid electrolyte.

[0111] Combine the obtained sulfide solid electrolyte with LiBr H 2 O was mixed under an Ar atmosphere to obtain the target sulfide solid electrolyte. LiBr H 2 The amount of O added relative to the sulfide solid electrolyte and LiBr·H 2 The t...

Embodiment 8 and comparative example 4 and 5

[0113] In addition to making relative to the sulfide solid electrolyte and LiBr·H 2 Total amount of O LiBr·H 2 A solid battery was fabricated in the same manner as in Example 7 except that the ratio of the amount of O added was as shown in Table 3.

[0114] The XRD measurement results of the sulfide solid electrolytes obtained in Examples 7 and 8 and Comparative Examples 4 and 5 are shown in Figures 2 to 5 . In addition, the 0.1C discharge capacities of the solid batteries obtained in Examples 7 and 8 and Comparative Examples 4 and 5 were measured. Furthermore, the 5C discharge capacity and discharge capacity retention rate of the solid state batteries obtained in Examples 7 and 8 and Comparative Examples 4 and 5 were measured. These results are shown in Table 3. The measurement method is the same as in Example 5 above.

[0115] table 3

[0116]

[0117] From the results shown in Table 3, it can be seen that the solid batteries using the sulfide solid electrolytes ob...

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Abstract

Provided is a sulfide solid electrolyte that has a diffraction peak A in a 2Theta range of 20.0-24.0 degrees inclusive and a diffraction peak B in a 2Theta range of 24.4-26.4 degrees inclusive in X-ray diffractometry using a CuKalfa1 ray, wherein, when the intensity of peak A is represented by IA and the intensity of peak B is represented by IB, then the ratio between IB and IA, i.e., IA / IB is not greater than 2.0. Preferably, the sulfide solid electrolyte contains lithium element, phosphorus element, sulfur element and a halogen element. Preferably, the sulfide solid electrolyte has an argyrodite crystal structure. Preferably, the sulfide solid electrolyte contains a lithium halide hydrate.

Description

technical field [0001] The invention relates to a sulfide solid electrolyte. In addition, the present invention relates to an electrode mixture containing a sulfide solid electrolyte and a solid battery. Background technique [0002] Since the solid battery does not use a flammable organic solvent, it can simplify the safety device, and not only can make the manufacturing cost and productivity excellent, but also has the advantage of stacking in series in the unit battery (cell; cell) to achieve high voltage. a feature. [0003] As one of solid electrolytes for solid batteries, sulfide solid electrolytes have been studied. However, when a solid battery including a sulfide solid electrolyte is charged and discharged, the reaction resistance between the active material and the sulfide solid electrolyte increases, and the movement of lithium ions is restricted, resulting in a decrease in battery characteristics. question. The reason for this is considered to be that since t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M4/62H01M10/0525
CPCH01M10/0562H01M4/628H01M10/0525C01B25/14H01B1/06H01B1/10H01M2300/0068Y02E60/10H01M4/13H01M4/62C01P2002/70C01P2002/72C01P2002/30C01P2002/74C01P2006/40
Inventor 高桥司筑本崇嗣小形曜一郎
Owner MITSUI MINING & SMELTING CO LTD
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