An all-solid-state lithium battery and a preparation method thereof

A lithium battery, all-solid-state technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of poor cycle stability, inability to effectively control the electrode structure, low battery energy density, etc., to achieve poor electronic conductivity, Good ion conductivity, the effect of weakening the formation of space charge layer

Active Publication Date: 2018-12-21
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

[0008] The main purpose of the present invention is to provide an all-solid-state lithium battery and its preparation method, which aims to solve the problems that the existing methods cannot effectively control the electrode structure, the energy density of the prepared battery is low, and the cycle stability is poor.

Method used

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  • An all-solid-state lithium battery and a preparation method thereof
  • An all-solid-state lithium battery and a preparation method thereof
  • An all-solid-state lithium battery and a preparation method thereof

Examples

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Embodiment 1

[0036] Choose LiNi 0.8 co 0.1 mn 0.1 o 2 As a positive electrode material coated into a pole piece, garnet-type Li 7 La 3 Zr 2 o 12 As the electrolyte, it is pressed into a 13mm sheet, and metal lithium is used as the negative electrode. Weigh 30 g of melamine in a crucible, raise the temperature to 550° C., and keep it warm for 6 hours to obtain a yellow powder. Then weigh 5g yellow powder and 2g NaNO 3 To mix, add 120 mL concentrated H 2 SO 4 Place in an ice bath and stir. Add 10g KMnO after reacting for 40min 4 , and then moved into a warm water bath at 40°C to continue the reaction. After 30 minutes, deionized water was slowly added, and the reaction temperature was kept at 98°C. After stirring for 5 minutes, an appropriate amount of H was added. 2 o 2 Filter until no bubbles are generated, wash the filter residue until it is neutral, then dry it, and then ultrasonically disperse it in DMF. The dispersion liquid was added dropwise on the solid electrolyte lay...

Embodiment 2

[0039] Choose LiCoO 2 As a positive electrode material coated into a pole piece, garnet-type Li 7 La 3 Zr 2 o 12 As the electrolyte, it is pressed into a 13mm sheet, and metal lithium is used as the negative electrode. Weigh 50 g of dicyandiamide into a crucible, heat up to 550° C., and keep it warm for 12 hours to obtain a yellow powder. Then weigh 3g yellow powder and 2g NaNO 3 To mix, add 180 mL concentrated H 2 SO 4 Place in an ice bath and stir. Add 10g KMnO after reacting for 40min 4 , and then moved into a warm water bath at 40°C to continue the reaction. After 20 minutes, deionized water was slowly added, and the reaction temperature was kept at 90°C. After stirring for 8 minutes, an appropriate amount of H was added. 2 o 2 Filter until no bubbles are generated, wash the filter residue until it is neutral, then dry it, and then ultrasonically disperse it in DMF. The dispersion liquid was added dropwise on the positive electrode, spin-coated and dried, and th...

Embodiment 3

[0042] Choose LiFeO 4 As the positive electrode material coated into pole pieces, sulfide Li 2 S-P 2 S 5 As the electrolyte, it is pressed into a 13mm sheet, and metal lithium is used as the negative electrode. Weigh 80 g of dicyandiamide into a crucible, heat up to 550° C., and keep it warm for 2 hours to obtain a yellow powder. Then weigh 6g yellow powder and 2g NaNO 3 To mix, add 120 mL concentrated H 2 SO 4 Place in an ice bath and stir. Add 10g KMnO after reacting for 40min 4 , and then moved into a warm water bath at 40°C to continue the reaction. After 60 minutes, deionized water was slowly added, and the reaction temperature was kept at 98°C. After stirring for 5 minutes, an appropriate amount of H was added. 2 o 2 Filter until no air bubbles are generated, wash the filter residue until it is neutral, then dry it, and then ultrasonically disperse it in NMP. The dispersion liquid was added dropwise on the solid electrolyte layer, spin-coated and dried, and the...

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Abstract

The invention discloses an all-solid-state lithium battery using g-C3N4 as a cathode modification layer and a preparation method thereof; The method comprises that the g-C3N4 is peeled off by graphene-like treatment to obtain a two-dimensional lamellar structure; as a modified layer, the contact area between the cathode active material and the electrolyte is increased and the contact impedance isdecreased. The modified layer can form good electrode / electrolyte interface and lithium ion transport channel between the electrode and the electrolyte, effectively weaken the formation of space charge layer, at the same time, can restrain the interface reaction and element diffusion between the cathode material and solid electrolyte, effectively reduce the interface impedance, improve the capacity of lithium ion battery in the charge and discharge process, and greatly improve the cycle stability.

Description

technical field [0001] The invention relates to the technical field of all-solid lithium batteries, in particular to an all-solid lithium battery and a preparation method thereof. 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, commercial lithium-ion batteries containing liquid organic solvents, due...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525H01M10/058
CPCH01M4/62H01M4/628H01M10/0525H01M10/058Y02E60/10Y02P70/50
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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