Solid electrolyte composite membrane and preparation method thereof

A technology of solid electrolyte and composite membrane, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolytes, and non-aqueous electrolyte batteries. Strength, improvement of ionic conductivity and stability, improvement of safety and service life

Pending Publication Date: 2022-02-25
ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, harsh conditions such as high temperature and high pressure are required to form a dense solid electrolyte, which will not only increase the cost, but also may cause other adverse reactions
Moreover, the gaps left between these solid electrolyte particles will also reduce the effective passage of lithium ions, and it is difficult to maintain good contact with the positive and negative electrodes. All of the above are also problems to be solved for solid-state batteries
Furthermore, these solid-state electrolytes are structurally brittle or have insufficient mechanical strength, which affects the large-scale mass production of themselves or the assembled solid-state batteries.

Method used

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  • Solid electrolyte composite membrane and preparation method thereof
  • Solid electrolyte composite membrane and preparation method thereof
  • Solid electrolyte composite membrane and preparation method thereof

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preparation example Construction

[0049] Please refer to image 3 Another specific embodiment of the present invention describes a method for preparing the above-mentioned solid electrolyte composite membrane, comprising: a layered structure forming step (S1), a prepolymer filling step (S2), and a prepolymer in-situ polymerization step ( S3).

[0050] Layered structure forming step (S1): forming an inorganic solid electrolyte into a layered structure with internal pores.

[0051] Specifically, the raw materials of the inorganic solid electrolyte can be calcined to form a layered structure of the inorganic solid electrolyte. This method can be the same as the prior art, and is known to those skilled in the art, and will not be repeated here.

[0052] Prepolymer filling step (S2): filling a prepolymer into the internal pores of the layered structure of the inorganic solid electrolyte.

[0053] Specifically, the prepolymer is a unit of a subsequent organic polymer, such as a monomer or a copolymer, and in order...

Embodiment 1

[0064] Choose LiOH·H 2 O as lithium source, La(OH) 3 As a source of lanthanum, ZrO 2 As a source of zirconium, Ta 2 o 5 as a source of tantalum. Weigh an appropriate amount of LiOH·H according to the stoichiometric ratio (15% excess lithium source) 2 O, La(OH) 3 , ZrO 2 and Ta 2 o 5 . After the above four raw materials were moved into the zirconia ball mill jar, zirconia balls with a diameter of 3 mm were added (the weight ratio of the ball to material was 10:1), and the speed was set at 400 rpm, and the ball milled for 12 hours. Transfer the mixed mixture powder to a corundum crucible, put it into a box-type muffle furnace for calcination, and calcine at a temperature of 950°C for 12 hours. After natural cooling, take out the LLZTO powder. The LLZO powder is subjected to secondary ball milling, and the setting of the weight ratio of the ball to material, the milling speed and the time is consistent with the aforementioned mixing ball milling. After ball milling, t...

Embodiment 2

[0068] The preparation process of the LLZTO powder and the green body is the same as in Example 1, and the secondary calcination temperature of the green body is 1100° C., and the temperature is kept for 12 hours. Finally, the LLZTO diaphragm was obtained by natural cooling, and the density of the diaphragm was measured to be 90% by the Archimedes drainage method.

[0069] The preparation process of the polymer prepolymer solution is the same as in Example 1.

[0070] The above-mentioned LLZTO membrane was quickly placed in the polymer prepolymer solution and soaked for several minutes to fully wet and penetrate into the internal pores. After wiping off a large amount of solution remaining on the surface, let it stand at room temperature for 24 hours to obtain a solid electrolyte composite membrane. The room temperature lithium ion conductivity of this solid electrolyte composite membrane is 5.7×10 -4 S cm -1 .

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Abstract

The invention provides a solid electrolyte composite membrane, which comprises an inorganic solid electrolyte and an organic solid electrolyte, wherein the inorganic solid electrolyte forms a layered structure with internal pores, the organic solid electrolyte is filled in the internal pores of the layered structure of the inorganic solid electrolyte, the organic solid electrolyte comprises an organic polymer, and the organic polymer is formed through in-situ polymerization reaction in internal pores of the layered structure of the inorganic solid electrolyte. According to the solid electrolyte composite membrane, gaps of a layered structure of the inorganic solid electrolyte can be fully filled, so that the compactness is improved, the generation of lithium dendrites is prevented, the safety of a solid-state battery is improved, and the service life of the solid-state battery is prolonged.

Description

technical field [0001] The invention relates to the technical field related to solid-state batteries, and in particular to a solid-state electrolyte composite membrane and a preparation method thereof. Background technique [0002] Semi-solid batteries and all-solid batteries are considered to be the next-generation energy storage devices that are most likely to achieve energy storage goals such as high energy density, high power, and high safety. Semi-solid electrolytes and solid electrolytes are the key components to realize semi-solid batteries and all-solid batteries. [0003] Solid-state electrolytes can be divided into three categories: sulfides, oxides, and organic polymers. Oxide electrolytes such as lithium lanthanum zirconium oxide (LLZO) and lithium aluminum titanate phosphate (LATP) and sulfide electrolytes such as LiPSCl are currently the most widely studied solid-state electrolytes. However, these solid-state electrolytes still cannot effectively prevent the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0562H01M10/058H01M10/05
CPCH01M10/0565H01M10/0562H01M10/058H01M10/05H01M2300/0017Y02E60/10Y02P70/50
Inventor 庄志吴惠康潘星星刘倩倩程跃
Owner ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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