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
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[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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