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Surface coating modified lithium lanthanum zirconium oxide solid electrolyte material and preparation method and application thereof

A technology of solid electrolyte, lithium lanthanum zirconium oxide, which is applied in the field of lithium lanthanum zirconium oxide solid electrolyte material and its preparation, can solve the problems of lithium-ion batteries with safety restrictions, increased charging and discharging polarization, and difficult contact interface, etc., to achieve Effects of widening application range, alleviating volume deformation, and improving surface chemical stability

Active Publication Date: 2022-07-26
济宁克莱泰格新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, safety issues have always been a major bottleneck restricting the application of lithium-ion batteries in large-scale energy storage fields such as power batteries and smart grids.
Due to the high hardness and brittleness of LLZTO, it is difficult to form a good contact interface with inorganic cathode materials
During the battery cycle, both the positive electrode material and the metal lithium negative electrode will undergo a large volume change, and the resulting stress will lead to poor interface contact, increased internal resistance of the battery, and increased charge-discharge polarization.

Method used

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  • Surface coating modified lithium lanthanum zirconium oxide solid electrolyte material and preparation method and application thereof
  • Surface coating modified lithium lanthanum zirconium oxide solid electrolyte material and preparation method and application thereof
  • Surface coating modified lithium lanthanum zirconium oxide solid electrolyte material and preparation method and application thereof

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preparation example Construction

[0035] The preparation method of the surface coating modified lithium lanthanum zirconium oxide solid electrolyte material, the method comprises:

[0036] (1) preparing the lithium lanthanum zirconium oxide solid electrolyte (LLZO);

[0037] The preparation method of lithium lanthanum zirconium oxide solid electrolyte (LLZO) is a sol-gel method. The molar ratio is (5+x): 3: x: (2-x) mixing, adding a solvent to dissolve, adding a precipitant to form a sol-gel, heating the solvent and evaporating to dryness to obtain a mixed powder; The lithium lanthanum zirconium oxide solid electrolyte (LLZO) can be obtained by sintering at 250-600° C. for 2-48 hours, after grinding again, and then sintering at 500-1000° C. for 2-48 hours.

[0038] Alternatively, the preparation method of the lithium lanthanum zirconium oxide solid electrolyte (LLZO) is a solid-phase reaction method, and the preparation steps include: preparing the precursors of lithium Li, lanthanum La, zirconium Zr and dopi...

Embodiment 1

[0043] (1) The chemical formula of Li is prepared by the solid-phase reaction method 6.75 La 3 Zr 1.75 Ta 0.25 O 12 The lithium lanthanum zirconium oxide solid electrolyte powder, the preparation steps include: according to the molar ratio of Li, La, Zr and Ta of 6.75:3:1.75:0.25, selecting LiOH, La 2 O 3 , ZrO 2 and Ta 2 O 5 LiOH was used as raw material in excess of 10 wt%, ball-milled in alcohol for 24 hours and then dried; then calcined at 900 °C for 10 hours, with a heating rate of 4 °C / min, after sintering, the powder was pulverized and sieved to obtain Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 Powder (LLZTO).

[0044] (2) The LLZTO powder is pretreated by drying and sieving, and then the pretreated LLZTO powder is placed in a chemical vapor deposition reaction chamber, the reaction chamber is evacuated to 5Pa, and preheated to a coating temperature of 800°C; The coating material is oxide glass solid electrolyte 0.5Li 2 CO 3 ·0.5Li 3 BO 3 (LCBO), heat its precur...

Embodiment 2

[0050] (1) The chemical formula of Li is prepared by the solid-phase reaction method 6.75 La 3 Zr 1.75 Ta 0.25 O 12 The lithium lanthanum zirconium oxide solid electrolyte powder, the preparation steps include: according to the molar ratio of Li, La, Zr and Ta of 6.75:3:1.75:0.25, selecting LiOH, La 2 O 3 , ZrO 2 and Ta 2 O 5 LiOH is used as raw material in excess of 10 wt%, ball-milled in alcohol for 24 hours and then dried; then calcined at 900 °C for 10 hours, with a heating rate of 4 °C / min, after sintering is completed, the powder is pulverized and sieved to obtain Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 Powder (LLZTO), sieve it to obtain LLZTO powder with uniform particle size.

[0051] (2) The LLZTO powder is pretreated by drying and sieving, and then the pretreated LLZTO powder is placed in a chemical vapor deposition reaction chamber, the reaction chamber is evacuated to 5 Pa, and preheated to a coating temperature of 700 °C ; The precursor of the coating mater...

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Abstract

The invention discloses a surface-coated modified lithium lanthanum zirconium oxide solid electrolyte material and a preparation method and application thereof. The electrolyte material comprises an inner core and a coating layer coated on the surface of the inner core, and the inner core is a lithium lanthanum zirconium oxide solid Electrolyte (LLZO), the coating material is at least one of amorphous glass solid electrolyte materials with lithium ion conductivity. The coating layer material involved in the present invention has strong toughness, and the coated modified lithium lanthanum zirconium oxygen can form a good interface contact with the electrode material in the solid-state lithium battery composite electrode, so as to relieve the volume deformation of the composite electrode during the cycle process. In turn, the energy density and cycle stability of the lithium lanthanum zirconium oxide solid-state lithium battery are improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a surface-coated modified lithium lanthanum zirconium oxide solid electrolyte material and a preparation method and application thereof. Background technique [0002] The development of high-efficiency secondary battery energy storage devices has important strategic significance for improving power balance, developing wind and solar sustainable energy, and promoting the development of new energy vehicles. Lithium-ion batteries have the advantages of high specific energy, high specific power, small self-discharge, and no memory effect, and have gradually entered the fields of electric vehicles, rail transit, and large-scale energy storage. However, safety issues have always been a major bottleneck restricting the application of lithium-ion batteries in large-scale energy storage fields such as power batteries and smart grids. Currently widely used lithium-ion batteries use vola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/42H01M10/052H01M10/0525
CPCH01M10/0562H01M10/052H01M10/0525H01M10/4235H01M2300/0068H01M2300/0071Y02E60/10
Inventor 郭向欣郭新赵宁
Owner 济宁克莱泰格新能源科技有限公司
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