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Negative electrode for solid-state battery as well as preparation method and application of negative electrode

A solid-state battery and negative electrode technology, which is applied in the field of solid-state battery negative electrodes and its preparation, can solve the problems of battery short circuit and uninhibited lithium dendrite growth, and achieve prevention of battery short circuit, improvement of energy density and safety, and high production efficiency Effect

Active Publication Date: 2021-06-25
SVOLT ENERGY TECH (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this document, the current collector is directly used as the site of lithium deposition, resulting in uninhibited growth of lithium dendrites, which can easily cause short circuit of the battery.

Method used

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  • Negative electrode for solid-state battery as well as preparation method and application of negative electrode
  • Negative electrode for solid-state battery as well as preparation method and application of negative electrode
  • Negative electrode for solid-state battery as well as preparation method and application of negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] This embodiment provides a negative electrode for a solid-state battery, such as figure 1 As shown, the negative electrode includes a stacked current collector 1 and a lithium storage layer 2, and the lithium storage layer 2 includes a lithium storage space layer and a polymer electrolyte layer 6 coated on the surface of the lithium storage space layer. The lithium space layer includes an electronic conductor skeleton 4, a lithium-friendly site 3 located in the gap of the electronic conductor skeleton, and an electrolyte 5 filled in the gap of the electronic conductor skeleton;

[0063] Wherein, the material of the current collector 1 is stainless steel, the thickness of the lithium storage space layer is 30 μm, the lithium-philic site 3 is formed of Ag, and the electrolyte 5 is composed of 1,3-dioxolane (DOL) and LiTFSI (bis Lithium trifluoromethanesulfonyl imide C 2 f 6 LiNO 4 S 2 ) mixed with 1 mol / L solution, the polymer electrolyte layer 6 has a thickness of 15...

Embodiment 2

[0071] This embodiment provides a negative electrode for a solid-state battery, the negative electrode includes a stacked current collector and a lithium storage layer, and the lithium storage layer includes a lithium storage space layer and a polymer electrolyte layer coated on the surface of the lithium storage space layer , the lithium storage space layer includes an electron conductor skeleton, a lithium-philic site located in the gap of the electron conductor skeleton, and an electrolyte filled in the gap of the electron conductor skeleton;

[0072] Wherein, the material of the current collector is stainless steel, the thickness of the lithium storage space layer is 20 μm, the lithium-friendly sites are formed by CuO, and the electrolyte is made of propylene carbonate and LiPF 6 (Lithium hexafluorophosphate) mixed 1mol / L solution, the thickness of the polymer electrolyte layer is 5 μm, made of polyacrylonitrile and LiPF 6 Mix to form.

[0073] The preparation method of t...

Embodiment 3

[0078] This embodiment provides a negative electrode for a solid-state battery, the negative electrode includes a stacked current collector and a lithium storage layer, and the lithium storage layer includes a lithium storage space layer and a polymer electrolyte layer coated on the surface of the lithium storage space layer , the lithium storage space layer includes an electron conductor skeleton, a lithium-philic site located in the gap of the electron conductor skeleton, and an electrolyte filled in the gap of the electron conductor skeleton;

[0079] Wherein, the material of the current collector is stainless steel, the thickness of the lithium storage space layer is 50 μm, and the lithium-friendly sites are composed of Co 3 o 4 Formed, the electrolyte is a 1mol / L solution mixed with ethyl methyl carbonate and LiTFSI, the thickness of the polymer electrolyte layer is 30 μm, and it is formed by mixing polyethylene oxide copolymer and LiTFSI.

[0080]The preparation method ...

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Abstract

The invention provides a negative electrode for a solid-state battery as well as a preparation method and application of the negative electrode. The negative electrode comprises a current collector and a lithium storage layer which are arranged in a stacked mode, wherein the lithium storage layer comprises a lithium storage space layer and a polymer electrolyte layer wrapping the surface of the lithium storage space layer, and the lithium storage space layer comprises an electronic conductor framework, lithium-loving sites located in gaps of the electronic conductor framework and electrolyte filled in the gaps of the electronic conductor framework. The lithium storage space for depositing lithium is constructed on the surface of the negative electrode current collector, lithium is induced to be deposited and stored at an expected position through a lithium-loving site, battery short circuit caused by disordered growth of lithium dendrites is further prevented, deposited lithium can be isolated from the solid electrolyte layer through the coated polymer electrolyte layer, therefore, mechanical damage to the solid electrolyte layer due to volume change caused by deposition and stripping of lithium is avoided.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and relates to a negative electrode for solid-state batteries and a preparation method and application thereof. Background technique [0002] With the rapid development of consumer electronics and electric vehicles, the demand for energy density, safety, reliability and service life of batteries continues to soar. Lithium metal has a very high theoretical specific capacity (3860mAh / Kg) and the lowest potential (-3.04V), so lithium metal secondary batteries are the preferred system for the next generation of high energy density energy storage devices. Solid-state batteries have attracted extensive attention from researchers due to their advantages such as high energy density and no memory effect. [0003] It is a direction for the development of anode-free lithium metal solid-state batteries to directly deposit lithium on the anode side to form metallic lithium without using active ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M4/62H01M10/052
CPCH01M4/13H01M4/139H01M4/0404H01M4/621H01M4/625H01M10/052H01M2004/027Y02E60/10
Inventor 李瑞杰王磊黄海强周龙捷陈少杰
Owner SVOLT ENERGY TECH (WUXI) CO LTD