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Surface modification method and application of garnet type solid electrolyte

A solid-state electrolyte, garnet-type technology, used in the manufacture of solid electrolytes, non-aqueous electrolytes, electrolyte batteries, etc., can solve the problems that the performance of the passivation layer cannot be completely eliminated, the environmental conditions are high, and the requirements cannot be met. The effect of forming, low environmental atmosphere requirements, and easy to control

Pending Publication Date: 2021-11-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, mechanical polishing and high temperature treatment are used to remove Li 2 CO 3 The surface layer, however, mechanical polishing is not suitable for garnet powder samples and the use of mechanical polishing requires a higher atmosphere (inert atmosphere), and high temperature treatment methods may lead to the loss of lithium and the generation of impurity phases
The existing methods for improving the chemical stability of garnet-type solid electrolytes and making them used in solid-state batteries have high requirements for environmental conditions, high costs, complicated processes, and inability to completely eliminate Li 2 CO 3 Passivation layer and the problem that the performance cannot meet the requirements

Method used

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  • Surface modification method and application of garnet type solid electrolyte
  • Surface modification method and application of garnet type solid electrolyte
  • Surface modification method and application of garnet type solid electrolyte

Examples

Experimental program
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Embodiment 1

[0080] The garnet-type solid electrolyte is specifically Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 (LLZT) solid electrolyte, in Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 The surface modification of (LLZT) solid-state electrolyte includes the following steps: immerse nano LLZT powder (LLZT-N) in 5ml of 0.5M LiPF dissolved in DMC 6 electrolyte solution, sealed in an aluminum-plastic bag, and then heated in an oven at 80°C for 6 hours. The samples were then removed, rinsed with DMC and dried. figure 1 is the transmission electron microscope image of the processed LLZT solid electrolyte, from figure 1 The presence of a protective layer on the surface of the LLZT garnet-type solid electrolyte can be clearly seen in the figure.

[0081] Based on the processed LLZT electrolyte (LLZT-T), a solid-state battery is assembled, including the following steps:

[0082] Step S1, preparation of negative electrode material: the negative electrode material is lithium metal;

[0083] Step S2, preparation ...

Embodiment 2

[0090] The garnet-type solid electrolyte is specifically Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 (LLZT) solid electrolyte ceramic sheet, in Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 The surface modification of (LLZT) solid-state electrolyte ceramic sheet includes the following steps: immerse the LLZT ceramic sheet in 5ml of 0.5M LiPF dissolved in DMC 6 electrolyte solution, sealed in an aluminum-plastic bag, and then heated in an oven at 80°C for 3 hours. Samples were removed, rinsed with DMC and dried.

[0091] A solid-state battery is assembled based on the processed LLZT ceramic solid-state electrolyte, including the following steps:

[0092] Step S1, preparation of negative electrode material: the negative electrode material is lithium metal;

[0093] Step S2, preparation of positive electrode material: LiFePO4 active material, carbon black and PVDF (the weight ratio of LiFePO4 active material, carbon black and PVDF is 75:10:15) is mixed, then the mixture is dispersed in N-methylpy...

Embodiment 3

[0097] A surface modification method and application based on a garnet-type solid electrolyte. The steps not specifically described in the specific steps are the same as the preparation method of Example 1, except that:

[0098] The nano-LLZT powder was immersed in 5ml of 0.5M LiTFSI electrolyte dissolved in DMC, sealed in an aluminum-plastic bag, and then heated in an oven at 80°C for 1 hour. The samples were then removed, rinsed with DMC and dried.

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Abstract

The invention relates to a surface modification method and application of a garnet type solid electrolyte. The method comprises the following steps: preparing a chemical solution containing a lithium salt with a certain concentration; and placing the garnet type solid electrolyte in the chemical solution, heating the garnet type solid electrolyte in a drying oven for a certain time, then taking out the garnet type solid electrolyte, and drying the garnet type solid electrolyte to obtain the treated garnet type solid electrolyte. According to the method, impurities such as lithium carbonate (Li2CO3) and lithium hydroxide (LiOH) on the surface and the interface of the garnet type solid electrolyte can be effectively removed, and a surface layer capable of effectively improving the stability of the garnet type solid electrolyte and reducing the interface impedance of the garnet type solid electrolyte is formed on the surface of the garnet type solid electrolyte. The treated garnet type solid electrolyte is applied to a solid lithium battery and shows stable electrochemical performance. The preparation method is simple, has low requirements on equipment and process conditions, and is beneficial to popularization and application.

Description

technical field [0001] The invention relates to the technical field of secondary battery energy storage, in particular to a surface modification method and application of a garnet-type solid electrolyte. Background technique [0002] In recent years, with the increasing popularity of lithium-ion batteries in electric vehicles, the need to develop high-energy-density lithium-ion batteries is more urgent than ever. However, lithium-ion batteries suffer from severe safety concerns due to the use of flammable organic liquid electrolytes and highly reactive electrodes. Although the use of flame-retardant electrolyte additives can reduce the flammability of electrolytes to some extent, it cannot fundamentally solve the safety problem. It turns out that replacing the liquid electrolyte with a nonflammable solid electrolyte to create a solid-state lithium-ion battery is a potential solution to essentially eliminating the danger of battery fires. [0003] Various solid-state Li-ion...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525H01M10/058
CPCH01M10/056H01M10/0525H01M10/058H01M2300/0065H01M2220/20Y02P70/50Y02E60/10
Inventor 王文莉郭炳焜周晶晶
Owner SHANGHAI UNIV