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Lanthanum-doped titanium trioxide coated co-modified lithium zinc titanate composite material and preparation method thereof

A technology of titanium dioxide and composite materials, applied in chemical instruments and methods, titanium oxide/hydroxide, titanate, etc., can solve the problems of complicated steps, pressure resistance requirements of high-pressure reactors, harsh preparation conditions, etc. To achieve the effect of improving ionic conductivity and improving electronic conductivity

Active Publication Date: 2020-08-18
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent uses a hydrothermal method to prepare a lithium-ion battery composite negative electrode material doped with lanthanum titanate. Compared with the solid-phase method, the hydrothermal method has cumbersome steps (such as suction filtration, washing and other steps, which are described in the article). The preparation conditions are harsh (high pressure is generated in the hydrothermal process, there are certain requirements for the pressure resistance of the high-pressure reactor, and there are safety hazards at the same time)

Method used

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  • Lanthanum-doped titanium trioxide coated co-modified lithium zinc titanate composite material and preparation method thereof
  • Lanthanum-doped titanium trioxide coated co-modified lithium zinc titanate composite material and preparation method thereof
  • Lanthanum-doped titanium trioxide coated co-modified lithium zinc titanate composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0052]A lithium-zinc titanate composite material coated with co-modified lanthanum-doped titanium oxide, the molecular formula of the composite material is Li 1.95 La 0.05 ZnTi 3 o 8 @Ti 2 o 3 , from lithium salt, lanthanum source, zinc source and titanium source according to the amount of substance n Li :n La :n Zn :n Ti =2.15:0.05:1:3 mixed and sintered, the lithium salt is Li 2 CO 3 , the lanthanum source is La(NO 3 ) 3 ·6H 2 O, zinc source is ZnO, titanium source is rutile TiO 2 .

[0053] The preparation method of above-mentioned composite material, comprises the steps:

[0054] Step A: Li 2 CO 3 , La(NO 3 ) 3 ·6H 2 O, ZnO and rutile TiO 2 Precursors were obtained by ball milling in absolute ethanol for 5 h, where n Li :n La :n Zn :n Ti =2.15︰0.05:1︰3; the ratio of absolute ethanol to lithium salt is: 3mL:0.2 g;

[0055] Step B: Dry the precursor obtained in step A in an oven for 1 h at a drying temperature of 80 °C;

[0056] Step C: Grinding the...

Embodiment 2

[0065] A lithium-zinc titanate composite material coated and co-modified with lanthanum-doped titanium oxide, the molecular formula of the negative electrode material is Li 1.97 La 0.03 ZnTi 3 o 8 @Ti 2 o 3 , from lithium salt, lanthanum source, zinc source and titanium source according to the amount of substance n Li :n La :n Zn :n Ti =2.17:0.03:1:3 mixed and sintered, the lithium salt is Li 2 CO 3 , the lanthanum source is La(NO 3 ) 3 ·6H 2 O, zinc source is ZnO, titanium source is rutile TiO 2 .

[0066] The preparation method of above-mentioned composite material, comprises the steps:

[0067] Step A: Li 2 CO 3 , La(NO 3 ) 3 ·6H 2 O, ZnO and rutile TiO 2 Precursors were obtained by ball milling in absolute ethanol for 6 h, where n Li :n La :n Zn :n Ti =2.17︰0.03:1︰3; the ratio of absolute ethanol to lithium salt is: 3mL:0.2g;

[0068] Step B: drying the precursor obtained in Step A in an oven for 2 h, and the temperature of the oven is 60°C;

[00...

Embodiment 3

[0076] A lithium-zinc titanate composite material coated and co-modified with lanthanum-doped titanium oxide, the molecular formula of the negative electrode material is Li 1.96 La 0.04 ZnTi 3 o 8 @Ti 2 o 3 , from lithium salt, lanthanum source, zinc source and titanium source according to the amount of substance n Li :n La :n Zn :n Ti =2.06:0.04:1:3 mixed and sintered, the lithium salt is CH 3 COOLi·2H 2O, the lanthanum source is La(NO 3 ) 3 ·6H 2 O, the zinc source is Zn(CH 3 COO) 2 2H 2 O, titanium source is anatase TiO 2 .

[0077] The preparation method of above-mentioned composite material, comprises the steps:

[0078] Step A: Change the CH 3 COOLi·2H 2 O, La(NO 3 ) 3 ·6H 2 O, Zn(CH 3 COO) 2 2H 2 O and anatase TiO 2 Precursors were obtained by ball milling in absolute ethanol for 4 h, where n Li :n La :n Zn :n Ti =2.06:0.04:1:3; the ratio of absolute ethanol to lithium salt is: 1.5 mL: 0.6 g;

[0079] Step B: drying the precursor obtained ...

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Abstract

The invention discloses a lanthanum-doped titanium trioxide coated co-modified lithium zinc titanate composite material and a preparation method thereof. The molecular formula of the composite material is Li(2-x)LaxZnTi3O8@Ti2O3, wherein x is 0.03-0.05; and the composite material is formed by mixing and sintering lithium salt, a lanthanum source, a zinc source and a titanium source according to the mass ratio: nLi:nLa:nZn:nTi=(2-2.3)-x:x:1:3. The composite material disclosed by the invention is high in specific discharge capacity and good in cycle and rate performance, and the preparation method is simple, convenient, rapid, low in energy consumption, low in cost and environment-friendly; and the prepared composite material can be widely applied to lithium ion batteries and lithium ion capacitor negative electrode materials, and has a relatively good application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a lithium-zinc titanate composite material coated and co-modified with lanthanum-doped dititanium oxide and a preparation method thereof. Background technique [0002] Lithium-ion batteries and supercapacitors are the most common energy storage devices in the past few decades. However, the cycle life of lithium-ion batteries is not ideal and the power density is low. Supercapacitors can be divided into electric double layer capacitors according to the way they store charge. Like Faraday quasicapacitors, supercapacitors have low energy density. Lithium ion capacitor is a new type of energy storage device between lithium ion battery and electric double layer capacitor. It has higher power density than lithium ion battery and higher energy density than electric double layer capacitor, while being able to maintain Good cycle performance, more and more widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525H01G11/24H01G11/26H01G11/46H01G11/50C01G23/00C01G23/04
CPCH01M4/366H01M4/485H01M4/628H01M10/0525H01G11/24H01G11/26H01G11/46H01G11/50C01G23/003C01G23/04C01P2002/72C01P2004/03C01P2004/04C01P2006/40H01M2004/021H01M2004/027Y02E60/10Y02E60/13
Inventor 王利娟张重学荀瑞沈紫烨冯莲晶
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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