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High-safety dendrite-free lithium metal battery as well as preparation method and application thereof

A lithium battery, lithium ion battery technology, applied in the direction of lithium battery, electrolyte battery manufacturing, battery electrodes, etc., can solve the problems of high chemical reaction activity, poor rechargeable battery life, aggravated dendrite growth, etc., to improve transmission efficiency, eliminate Stress, simple process effect

Pending Publication Date: 2021-05-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium dendrites usually form an unstable solid electrolyte interface, which leads to low Coulombic efficiency due to its high chemical reactivity, and even penetrates the separator or solid electrolyte, causing serious safety hazards.
An unstable solid-electrolyte interface further exacerbates dendrite growth, ultimately leading to poor battery life in rechargeable batteries

Method used

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  • High-safety dendrite-free lithium metal battery as well as preparation method and application thereof
  • High-safety dendrite-free lithium metal battery as well as preparation method and application thereof
  • High-safety dendrite-free lithium metal battery as well as preparation method and application thereof

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preparation example Construction

[0038] In one embodiment of the present invention, a method for preparing the above-mentioned all-solid-state lithium-ion battery is provided, comprising the following steps: coating gallium salt on metal lithium, using the metal lithium coated with gallium salt as a negative electrode, and In an inert atmosphere, the negative electrode and the required components of the lithium battery are jointly assembled into an all-solid-state battery to obtain;

[0039] In some typical embodiments, the inert atmosphere includes any one of argon, helium, hydrogen-argon mixed gas, etc., the moisture content of which is less than 1 ppm, and the oxygen content is less than 1 ppm.

[0040] In one embodiment of the present invention, an application of the negative electrode of the above-mentioned lithium dendrite-inhibiting lithium battery or the above-mentioned all-solid-state lithium-ion battery in the field of new energy industry is provided.

[0041] In the present invention, metal lithium...

Embodiment 1

[0044] A kind of preparation of the lithium battery that utilizes gallium salt to suppress lithium dendrite growth, comprises the steps:

[0045] (1) Use a small spoon to coat a layer of gallium nitrate on the lithium sheet, and the loading of gallium salt is 0.2mg / cm 2 ,Such as figure 1 shown.

[0046] (2) Cut the obtained lithium sheet into a disc with a diameter of 1 cm, and then use NMC811 (LiNi 0.8 mn 0.1 co 0.1 o 2 ) as the positive electrode, using PEO-LiTFSI (molar ratio EO: Li+ =10:1) As a solid electrolyte, it is assembled into a 2032-type button battery under an argon atmosphere, including a positive electrode case (stainless steel), a negative electrode case (stainless steel), a gasket (stainless steel), a solid electrolyte, a positive electrode sheet, and gallium-coated Lithium flakes of salt.

Embodiment 2

[0048] A kind of preparation of the lithium battery that utilizes gallium salt to suppress lithium dendrite growth, comprises the steps:

[0049] (1) Use a small spoon to coat a layer of gallium chloride on the lithium sheet, and the loading of gallium salt is 0.2mg / cm 2 ,Such as figure 1 shown.

[0050] (2) Cut the obtained lithium sheet into a disc with a diameter of 1 cm, and then use NMC811 (LiNi 0.8 mn 0.1 co 0.1 o 2 ) as the positive electrode, using PEO-LiTFSI (molar ratio EO: Li + =10: 1) As a solid electrolyte, the 2032-type coin cell shown in Example 1 was assembled under an argon atmosphere.

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Abstract

The invention belongs to the technical field of lithium batteries and relates to a high-safety dendrite-free lithium metal battery as well as a preparation method and application thereof. The negative electrode of the lithium battery capable of inhibiting lithium dendrites comprises metal lithium and gallium salt coating the metal lithium; the metal lithium is selected from any one of a lithium foil, a lithium sheet, a lithium block, lithium powder and a lithium alloy; the gallium salt is selected from any one of Ga (NO3) 3, GaCl3, Ga2 (CO3) 3, GaI3, GaF3, GaBr3 and GaN; the loading capacity of the gallium salt on the metal lithium is 1*10 <-5>-5*10 <-5> mol; the all-solid-state lithium ion battery comprises the negative electrode, a positive electrode and a solid-state lithium ion battery electrolyte, the positive electrode comprises a positive electrode active material, a current collector, a conductive agent and a binder; and the solid-state lithium ion battery electrolyte comprises a solid-state electrolyte and a lithium salt. The gallium salt coating can inhibit the generation of lithium dendrites and induce uniform lithium deposition, and is beneficial to improving the coulombic efficiency of the battery, stabilizing the interface between the battery and the solid electrolyte, prolonging the cycle life of the battery and reducing the safety problem induced by the lithium dendrites.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-safety dendrite-free lithium metal battery and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In recent years, batteries using graphite anodes have been used in smart mobile devices, large and small power tools and electric vehicles. However, due to the theoretical specific capacity of the graphite negative electrode is only 372mAh g -1 , this factor has greatly limited the development of current rechargeable lithium-ion batteries, and has become one of the biggest shackles in the development of rechargeable devices. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M10/052H01M10/0525H01M10/058
CPCH01M4/134H01M4/628H01M10/052H01M10/0525H01M10/058H01M2004/021H01M2004/027Y02P70/50Y02E60/10
Inventor 冯金奎武样
Owner SHANDONG UNIV