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

A solid electrolyte, garnet technology, 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 reduce contact resistance. Effect

Active Publication Date: 2019-08-02
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-state lithium battery, garnet solid-state electrolyte and preparation method thereof
  • All-solid-state lithium battery, garnet solid-state electrolyte and preparation method thereof
  • All-solid-state lithium battery, garnet solid-state 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-state lithium battery, a garnet solid-state electrolyte and a preparation method thereof. The garnet solid-state electrolyte comprises a matrix, wherein the matrixa garnet-type fast ionic conductor LiaMbLacZrdNeO12, M includes one or more of Al, Sr, Sc, Ca, Ba and Y, and N includes one or more of Ta and Nb; the surface of the matrix is coated with a solid lubricant so as to modify the interface of the solid-state electrolyte, and the solid lubricant includes one or more of WS2, WSe2, NbSe2, NbS2, MoSe2, TaS2, TaSe2, TiS2 and TiTe2. The solid-state electrolyte is in full surface contact with the garnet-type fast ionic conductor via the solid lubricant, thereby being conducive to improving the interface between crystal grains of the solid-state electrolyte and between an electrode and the solid-state electrolyte, thus acquiring low interface impedance, and significantly improving the durability and cycle performance of the battery.

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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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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