Lithium lanthanum titanate (LLTO) composite solid-state lithium ion electrolyte material, preparation method and application thereof

An electrolyte material, lithium lanthanum titanium oxide technology, which is applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of low grain boundary conductivity and low total conductivity, and achieve obvious effects and high grain boundary conductivity. and the effect of increasing the overall conductivity

Inactive Publication Date: 2014-09-17
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0006] In view of this, the first aspect of the embodiment of the present invention provides a lithium lanthanum titanium oxide compound solid lithium ion electrolyte material, which is used to solve the low grain boundary conductivity of the lithium lanthanum titanium oxide compound solid lithium ion electrolyte material in the prior art Problems leading to its low overall conductivity

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  • Lithium lanthanum titanate (LLTO) composite solid-state lithium ion electrolyte material, preparation method and application thereof
  • Lithium lanthanum titanate (LLTO) composite solid-state lithium ion electrolyte material, preparation method and application thereof
  • Lithium lanthanum titanate (LLTO) composite solid-state lithium ion electrolyte material, preparation method and application thereof

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preparation example Construction

[0043] In the second aspect, an embodiment of the present invention provides a method for preparing a lithium lanthanum titanium oxide compound solid lithium ion electrolyte material, comprising the following steps:

[0044] (1) Preparation of lithium lanthanum titanyl oxide compound: Li 3x La 2 / 3-x TiO 3 , 0

[0045] (2) Preparation of Li-La-Zr-O sol: LiNO 3 , La(NO 3 ) 3 ·6H 2 O, ZrO(NO 3 ) 2 2H 2 O and acetylacetone as raw materials, according to Li 7 La 3 Zr 2 o 12 The metering ratio of each element in is carried out proportioning, adds at least one in ethanol, acetone, isopropanol, ethylene glycol, ethylene glycol monomethyl ether, makes Li-La-Zr-O sol;

[0046] (3) Preparation of composite solid lithium ion electrolyte material precursor powder: take the Li prepared in step (1) 3x La 2 / 3-x TiO 3 Add at least one of ethanol, acetone, isopropanol, ethylene glycol, and ethylene glycol monomethyl ether, then add the Li-La-Zr-O sol prepared in step (2)...

Embodiment 1

[0063] A preparation method of a lithium lanthanum titanium oxide compound solid state lithium ion electrolyte material, comprising the following steps:

[0064] (1) Preparation of lithium lanthanum titanium oxide compound: with 0.7962g LiNO 3 (Lithium excess 10%), 7.145gLa(NO 3 ) 3 ·6H 2 Li 0.35 La 0.55 TiO 3 ;

[0065] (2) Li-La-Zr-O sol preparation: with 2.896g LiNO 3 , 7.794g La(NO 3 ) 3 ·6H 2 O, 3.207gZrO(NO 3 ) 2 2H 2 O and 3.604g of acetylacetone as raw materials were dissolved in 40ml of organic solvent ethylene glycol monomethyl ether solution (density 0.9647g / ml) to obtain Li-La-Zr-O sol, which contained 0.042mol of Li elements, La Element 0.018mol, Zr element 0.012mol, O element 0.072mol and Li element, La element and Zr element ratio meet Li 7 La 3 Zr 2 o 12 The molar ratio of each element in the element, and other O elements exist in other forms, so that the total mass of Li-La-Zr-O sol is calculated to be 56.089g, which corresponds to a theoretic...

Embodiment 2

[0070] A preparation method of a lithium lanthanum titanium oxide compound solid state lithium ion electrolyte material, comprising the following steps:

[0071] (1) Preparation of lithium lanthanum titanium oxide compound: with 1.137g LiNO 3 (Lithium excess 10%), 6.495gLa(NO 3 ) 3 ·6H 2 Li 0.5 La 0.5 TiO 3 ;

[0072] (2) Li-La-Zr-O sol preparation: with 2.896g LiNO 3 , 7.794g La(NO 3 ) 3 ·6H 2 O, 3.207gZrO(NO 3 ) 2 2H 2 O and 3.604g of acetylacetone as raw materials were dissolved in 40ml of organic solvent ethylene glycol monomethyl ether solution (density 0.9647g / ml) to obtain Li-La-Zr-O sol, which contained 0.042mol of Li elements, La Element 0.018mol, Zr element 0.012mol, O element 0.072mol and Li element, La element and Zr element ratio meet Li 7 La 3 Zr 2 o 12 The molar ratio of each element in the element, and other O elements exist in other forms, so that the total mass of Li-La-Zr-O sol is calculated to be 56.089g, which corresponds to a theoretical ...

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Abstract

An embodiment of the invention provides a lithium lanthanum titanate (LLTO) composite solid-state lithium ion electrolyte material which is composed of Li<3x>La<2/3-x>TiO3 and zirconium which is enriched in a crystal boundary layer of the Li<3x>La<2/3-x>TiO3, wherein 0<x<0.16. The material is of excellent crystal boundary conductivity and total conductivity and is simple in a preparation technology. The embodiment of the invention also provides a preparation method of the LLTO composite solid-state lithium ion electrolyte material. A precursor powder of the composite solid-state lithium ion electrolyte material is prepared in a manner of coating LLTO by a lithium-lanthanum-zirconium-oxygen sol and then performing a sintering process to obtain the LLTO composite solid-state lithium ion electrolyte material. The LLTO is increased in crystal boundary conductivity and total conductivity. The preparation method is simple. In addition, the embodiment of the invention provides an application of the LLTO composite solid-state lithium ion electrolyte material in a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium lanthanum titanium oxide compound solid lithium ion electrolyte material and a preparation method and application thereof. Background technique [0002] At present, commercial lithium-ion batteries use liquid electrolytes, which have safety hazards such as combustion and explosion, which severely limit the application of lithium-ion batteries in the field of new energy storage power stations and electric vehicles. The all-solid-state lithium-ion battery made of inorganic solid electrolyte replaces the commercial lithium-ion battery made of liquid electrolyte, which fundamentally solves the safety problem of lithium-ion batteries, and further improves the service temperature range and storage of lithium-ion batteries. life. [0003] Inorganic solid-state electrolytes are the core of all-solid-state lithium-ion batteries. First of all, solid electrolyte ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/058
CPCH01M10/0525H01M10/0562H01M2300/002Y02E60/10Y02P70/50
Inventor 陈凯沈洋南策文裴佳宁刘振国
Owner HUAWEI TECH CO LTD
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