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Sulfide solid electrolyte and preparation method thereof, and all-solid-state battery

A technology of sulfide electrolyte and solid electrolyte, applied in electrolytes, secondary batteries, circuits, etc., can solve the problems of poor ionic conductivity, weak performance of high-voltage-resistant positive electrode materials, and insignificant effects, and achieve excellent electrical performance, high Good ionic conductivity and stability

Active Publication Date: 2019-10-08
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, using Li 2 O, Li 3 PO 4 , P 2 o 5 After waiting for "non-oxidizing" raw materials / additives, the prepared sulfide electrolyte itself is still in a non-oxidizing state. Although the stability of water in dry air has improved, the effect is not obvious. High-voltage resistant positive electrode materials ( especially charging state) performance is still weak
Moreover, when more O replaces S, O tends to spontaneously gather together to form PO 4 3- structure, the ionic conductivity of the unit is extremely poor, which in turn will reduce the ionic conductivity of the sulfide electrolyte

Method used

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  • Sulfide solid electrolyte and preparation method thereof, and all-solid-state battery
  • Sulfide solid electrolyte and preparation method thereof, and all-solid-state battery
  • Sulfide solid electrolyte and preparation method thereof, and all-solid-state battery

Examples

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Effect test

Embodiment 1

[0046] A kind of sulfide solid electrolyte, the component is 4.95Li 2 S-0.05Li 2 o 2 -GeS 2 -P 2 S 5 (i.e. Li 2 o 2 Incorporate Li 10 GeP 2 S 12 Replace part of Li 2 S), its preparation method comprises the following steps:

[0047] 19.3145g of Li 2 S, 0.1948g of Li 2 o 2 , 11.6148g of GeS 2 , 18.8759g of P 2 S 5 The raw materials were mixed, placed in a 500 mL roller mill jar, 400 g of 10 mm yttrium stabilized zirconia grinding beads were added, and ground at 150 rpm for 24 hours until uniformly mixed to obtain a precursor. Take 2g of the precursor and press it into tablets, put ten pieces into a quartz tube with an inner diameter of 25mm and a length of 300mm, seal it, and calcinate it at 680°C for 20min, and grind the calcined block into powder to obtain a sulfide solid electrolyte powder.

Embodiment 2

[0049] A kind of sulfide solid electrolyte, the component is 13.86Li 2 S-0.14Li 2 o 2 -2 GeS 2 -3P 2 S 5 (i.e. Li 2 o 2 Incorporate Li 3.25 Ge 0.25 P 0.75 S 4 replace part L i 2S), its preparation method comprises the following steps:

[0050] 20.1068g of Li 2 S, 0.2028g of Li 2 o 2 , 8.6366g GeS 2 , 21.0538g of P 2 S 5The raw materials were mixed, placed in a 500 mL roller mill jar, 400 g of 10 mm yttrium stabilized zirconia grinding beads were added, and ground at 150 rpm for 24 hours until uniformly mixed to obtain a precursor. Take 2g of the precursor and press it into tablets, put ten pieces in a quartz tube with an inner diameter of 25mm and a length of 300mm, seal it, and calcinate at 520°C for 4h, and grind the calcined block into powder to obtain a sulfide solid electrolyte powder.

Embodiment 3

[0052] A kind of sulfide solid electrolyte, the component is 4.95Li 2 S-0.05Li 2 o 2 -P 2 S 5 -2LiCl (ie Li 2 o 2 Incorporate Li 6 P.S. 5 Cl replaces part of Li 2 S), its preparation method comprises the following steps:

[0053] 21.1849g of Li 2 S, 0.2137g of Li 2 o 2 , 7.8976g of LiCl, 20.7038g of P 2 S 5 The raw materials were mixed, placed in a 500 mL roller mill jar, 400 g of 10 mm yttrium stabilized zirconia grinding beads were added, and ground at 150 rpm for 24 hours until uniformly mixed to obtain a precursor. Take 2g of the precursor and press it into tablets, put ten pieces in a quartz tube with an inner diameter of 25mm and a length of 300mm, seal it, and calcinate at 550°C for 4h, and grind the calcined block into powder to obtain a sulfide solid electrolyte powder.

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Abstract

The invention relates to the technical field of an all-solid-state battery and particularly relates to sulfide solid electrolyte and a preparation method thereof, and the all-solid-state battery. Thesulfide solid electrolyte is mainly made of oxidant and a sulfide electrolyte raw material, wherein the oxidant is one or mixture of both of solid oxidant and gaseous oxidant. The method is advantagedin that through inhibiting decomposition of the sulfide electrolyte or forming a stable [PS3O] unit, stability of the sulfide solid electrolyte to the water at a dew point of -45 DEG C in the dry airis relatively good, performance degradation of the sulfide solid electrolyte is reduced, moreover, excellent ionic conductivity of the sulfide solid electrolyte is ensured, and the stability of the sulfide solid electrolyte to a high voltage positive pole material is improved.

Description

technical field [0001] The invention relates to the technical field of all-solid batteries, in particular to a sulfide solid electrolyte, a preparation method thereof, and an all-solid battery. Background technique [0002] Lithium-ion batteries have the advantages of large specific energy, high working voltage, stable discharge potential, and long life, and are widely used in mobile phones, digital cameras, notebook computers, new energy vehicles and other mobile devices. At present, the traditional liquid electrolyte lithium-ion secondary battery has achieved great commercial success, but it has safety hazards such as leakage and explosion, so the solid electrolyte of lithium-ion battery came into being. [0003] Among them, sulfide solid electrolytes have received extensive attention due to their high ionic conductivity, wide compositional range, and low cost of raw materials. However, generally known sulfide solid electrolytes have poor stability to water in dry air wit...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0585H01M10/0525
CPCH01M10/0562H01M10/0525H01M10/0585H01M2300/0091Y02E60/10Y02P70/50
Inventor 黄晓许晓雄吴林斌
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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