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Full-solid-state lithium battery negative electrode material, preparation method and all-solid-state lithium battery

A negative electrode material, lithium battery technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems that the modification method cannot be effectively controlled, and the performance of the battery is affected, so as to achieve improved electrochemical performance, excellent matching, and good performance. The effect of conductivity and stability

Active Publication Date: 2018-12-11
湖南恩捷前沿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

[0007] The main purpose of the present invention is to provide an all-solid-state lithium battery negative electrode material, a preparation method and an all-solid-state lithium battery, aiming to solve the current problem of TiO 2 The modification method of the negative electrode material cannot effectively control the electrode structure, and the performance of the prepared battery is affected.

Method used

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  • Full-solid-state lithium battery negative electrode material, preparation method and all-solid-state lithium battery

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preparation example Construction

[0039] The preparation step of described titanium dioxide white powder comprises:

[0040] S1: Evenly mix butyl titanate and absolute ethanol at a volume ratio of 1:2-3;

[0041] S2: adding deionized water dropwise to the mixed solution to prepare a gel;

[0042] S3: After aging for a period of time, the gel is dried in an oven, dried and ground to obtain a white titanium dioxide powder.

[0043] Preferably, the volume ratio of the deionized water to the mixed solution is 0.1-0.6:1. If the amount of deionized water added is too small, it cannot ensure that the butyl titanate in the mixed solution cannot be completely hydrolyzed, which will affect the production of TiO 2 quality. If too much deionized water is added, the gel cannot be formed.

[0044] Preferably, the aging time in the step S3 is 20-36h. The aging time determines the progress of the reaction and the particle size of the reaction product. If the time is too short, the reaction cannot be completely carried ou...

Embodiment 1

[0051] Choose LiCoO 2 As a positive electrode material coated into a pole piece, garnet-type Li 7 La 3 Zr 2 o 12 Pressed into 13mm sheets as electrolyte. Mix butyl titanate and absolute ethanol uniformly at a ratio of 1:2 to obtain 300ml of a mixed solution, and add 90ml of deionized water dropwise to the mixed solution to prepare a gel. After aging for 30 hours, it was dried and ground at 90°C to obtain a white powder. The resulting white powder contained 2% H 2 Calcined in Ar mixed gas for 20s, the final black product was obtained. figure 1 For the XRD pattern of the prepared product, as shown in the figure, the prepared material is titanium dioxide. figure 2 For the high-resolution TEM image of the prepared product, as shown in the figure, the prepared material has an obvious layered core-shell structure, in which TiO 2 The core size is 300nm, oxygen-deficient TiO 2 The shell thickness is 30 nm.

[0052] The material prepared in this example was coated into a pol...

Embodiment 2

[0054] Choose LiFeO 4 As the positive electrode material coated into a pole sheet, Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Pressed into 13mm sheets as electrolyte. Mix butyl titanate and absolute ethanol uniformly at a ratio of 1:3 to obtain 200ml of a mixed solution, and add 100ml of deionized water dropwise to the mixed solution to prepare a gel. After aging for 24 hours, it was dried and ground at 80°C to obtain a white powder. The resulting white powder contained 3% H 2 Calcined in Ar mixed gas for 10s, the final black product is obtained, in which TiO 2 The core size is 500nm, and oxygen-deficient TiO 2 The shell thickness is 70 nm.

[0055] After the materials prepared in this example were coated into pole pieces, they were assembled into coin cells in the order of positive electrode-electrolyte-negative electrode for testing. When performing constant current charge and discharge at 5C rate of the positive electrode material at 70°C, the specific capacity can still be m...

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Abstract

The invention discloses an all-solid-state lithium battery negative electrode material, a preparation method and an all-solid-state lithium battery, wherein, the negative electrode material is TiO2 with a core-shell structure; The nucleus is oxygen-free titanium dioxide, and the particle size of the nucleus is 200- 1000nm; The shell is oxygen-defective titanium dioxide, and the thickness of the shell is 20- 200nm. The all-solid-state lithium battery negative electrode material prepared by the invention has higher lithium ion conductivity compared with the pure titanium dioxide electrode, and has better conductivity and stability compared with the pure oxygen-defective titanium dioxide. The method for preparing all-solid-state lithium battery negative electrode material has the advantages of high repeatability, simple process and large-scale production.

Description

technical field [0001] The invention relates to the technical field of all-solid-state lithium batteries, in particular to an all-solid-state lithium battery negative electrode material, a preparation method and an all-solid-state lithium battery. Background technique [0002] Energy is the main material basis for developing the national economy and improving people's living standards, and it is also an important factor that directly affects economic development. Since the beginning of the 21st century, problems such as resource shortage, environmental pollution, and greenhouse effect caused by traditional energy utilization methods have become increasingly prominent. Improving the energy structure and developing efficient and clean new energy sources has become a global consensus. Lithium-ion batteries are favored by people because of their superior properties such as safety, environmental protection, high specific energy and good electrochemical performance. However, comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M10/0525
CPCH01M4/366H01M4/48H01M4/485H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘芳洋王麒羽汪齐蒋良兴贾明赖延清李劼刘业翔
Owner 湖南恩捷前沿新材料科技有限公司
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