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All-solid lithium battery, garnet solid electrolyte and preparation method thereof

A technology of solid electrolyte and garnet, which is applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of large interface contact resistance, achieve good interface contact, increase effective contact area, and facilitate industrialization

Active Publication Date: 2021-02-02
广州博粤新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a kind of interface modified and modified solid-state electrolyte, all-solid-state lithium battery and the preparation method of solid-state electrolyte, aim at solving the problem that garnet solid-state electrolyte is easy to form Li at the interface. 2 CO 3 and LiOH, resulting in the problem of excessive contact resistance at the interface

Method used

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  • All-solid lithium battery, garnet solid electrolyte and preparation method thereof
  • All-solid lithium battery, garnet solid electrolyte and preparation method thereof
  • All-solid lithium battery, garnet solid electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of garnet solid electrolyte (Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 ) matrix

[0032]First, the raw materials lithium hydroxide monohydrate, lanthanum oxide, zirconium oxide, and tantalum oxide were placed in a ball mill tank containing isopropanol according to the stoichiometric ratio at a speed of 400 rpm for 6 hours, and the excess lithium was 15% to supplement the high-temperature sintering of the solid electrolyte. Lithium evaporates during the process. After ball milling, the raw materials were dried in vacuum and then placed in a muffle furnace for sintering at 950° C. for 6 h to obtain the precursor powder. Then, the precursor powder was placed in a ball mill jar and ball milled at a speed of 400 rpm for 12 hours to obtain an active fine powder precursor. After the fine powder precursor was compressed by a tablet press at 200 rpm, it was placed in a muffle furnace for sintering at 1250°C for 50 minutes to obtain a solid electrolyte matrix. The obt...

Embodiment 2

[0040] (1) Preparation of garnet solid electrolyte (Li 6.6 La 3 Zr 1.6 Ta 0.4 o 12 ) matrix

[0041] The Li 6.5 La 3 Zr 1.6 Ta 0.4 o 12 The electrolyte matrix was also synthesized by a solid-phase method. The preparation method is the same as in Example 1.

[0042] (2) Form an interface modification layer on the surface of the substrate

[0043] Place the above solid electrolyte matrix on a clean platform, weigh 0.006g of NbS with a particle size of 38um 2 Place on the surface of the solid electrolyte matrix and grind for 5 minutes, so that a layer of 3um NbS is formed on the surface of the solid electrolyte matrix 2 interface layer to obtain a solid electrolyte (S3) after interface modification.

[0044] (3) Preparation of all-solid lithium pair batteries

[0045] The interface-modified solid electrolyte (S3) prepared above was cold-pressed with two lithium sheets to obtain an all-solid lithium pair battery. The results show that compared with the unmodified al...

Embodiment 3

[0049] (1) Preparation of garnet solid electrolyte (Li 6.7 La 3 Zr 1.7 Nb 0.3 o 12 ) matrix

[0050] The Li 6.7 La 3 Zr 1.7 Nb 0.3 o 12 The electrolyte matrix was also synthesized by a solid-phase method. The preparation method is the same as in Example 1.

[0051] (2) Form an interface modification layer on the surface of the substrate

[0052] Place the above solid electrolyte matrix on a clean platform and weigh 0.008g of MoSe with a particle size of 5um 2 Place on the surface of the solid electrolyte matrix and grind for 3 minutes, so that a layer of 2um MoSe is formed on the surface of the solid electrolyte matrix 2 interface layer to obtain a solid electrolyte (S4) after interface modification.

[0053] (3) Preparation of all-solid lithium pair batteries

[0054] The interface-modified solid electrolyte (S4) prepared above was cold-pressed with two lithium sheets to obtain an all-solid lithium pair battery. After the lithium pair battery test, compared wit...

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Abstract

The invention discloses an all-solid lithium battery, a garnet solid electrolyte and a preparation method thereof, wherein the garnet solid electrolyte includes a matrix, and the matrix is ​​a garnet-type fast ion conductor Li a m b La c Zr d N e o 12 , where M includes one or more of Al, Sr, Sc, Ca, Ba, Y, and N includes one or more of Ta and Nb; a layer of solid lubricant is coated on the surface of the substrate to modify the solid electrolyte interface, the solid lubricant includes WS 2 、WSe 2 , NbSe 2 , NbS 2 、MoSe 2 、TaS 2 、TaSe 2 、TiS 2 、TiTe 2 one or more of them. The solid electrolyte of the present invention is fully contacted by the solid lubricant and the garnet-type fast ion conductor, which helps to improve the interface between the solid electrolyte grains and the electrode / solid electrolyte, thereby obtaining a lower interface impedance and improving the durability of the battery. Performance and cycle performance have been significantly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an all-solid lithium battery, a garnet solid electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, large output power, high voltage, small self-discharge, wide operating temperature range, no memory effect, and environmental friendliness. They have been used in electric vehicles, rail transit, large-scale energy storage, and aerospace. field. At present, commercial lithium-ion batteries use organic liquid electrolytes. The electrolyte and electrode materials are prone to side reactions during charge and discharge, resulting in irreversible decline in battery capacity. Drying, leakage and other phenomena will affect the battery life. On the other hand, traditional lithium-ion batteries cannot use metal lithium with high energy density as the negative electrode materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/058H01M2300/0071Y02E60/10Y02P70/50
Inventor 刘芳洋赖延清孙振吕娜蒋良兴贾明李劼刘业翔
Owner 广州博粤新材料科技有限公司
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