Solid electrolyte and preparation method thereof and lithium ion battery

A solid electrolyte and electrolyte technology, which is applied in the direction of electrolyte immobilization/gelation, secondary batteries, circuits, etc., can solve the problem of inability to effectively form lithium-ion conductive pathways, limited improvement of ionic conductivity of composite electrolytes, and improvement of mechanical strength of composite electrolytes limited and other issues, to achieve the effect of easy large-scale application, excellent lithium ion conductivity and mechanical strength, and good cycle performance

Active Publication Date: 2020-11-06
ZHUHAI COSMX POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the obtained composite electrolyte, since the oxide or sulfide powder is distributed in the polymer in a discrete state, the oxide electrolyte and the sulfide electrolyte with high ion conductivity cannot effectively form a lithium ion conductive path, so the obtained composite electrolyte Limited improvement in ionic conductivity
In addition, discretely distributed oxide or sulfide powders have very limited improvement in the mechanical strength of composite electrolytes.

Method used

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  • Solid electrolyte and preparation method thereof and lithium ion battery
  • Solid electrolyte and preparation method thereof and lithium ion battery
  • Solid electrolyte and preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0045] The present invention does not limit the preparation method of the inorganic electrolyte tube body. In one embodiment, the inorganic electrolyte tube body can be obtained by a method including the following processes:

[0046] 1) 5-30 parts by mass of the nano inorganic electrolyte powder A, 1-30 parts by mass of the polymer B, and 40-96 parts by mass of the solvent C1 are prepared into a mixed solution R. The mixed solution R is used as the outer tube solution, the inner tube is ventilated with air or solvent C2, and coaxial electrospinning is performed on the electrospinning equipment to obtain a composite hollow tube D. The parameters of coaxial electrospinning are: outer tube diameter 50~4000nm; inner tube diameter 10~2000nm; voltage 1~100kV; receiving distance 1~100cm.

[0047] 2) The composite hollow tube D is calcined at 300-1200°C for 0.5-12h to remove polymer and sintered, and the tube length is shortened to the required tube length by mechanical shearing equipment ...

Embodiment 1

[0076] The inorganic electrolyte tube body of this embodiment is prepared by the following method:

[0077] 1) Add 5 parts by mass of nano inorganic electrolyte powder A (Li 3 PS 4 , An average particle size of 10nm), 1 part by mass of polymer B (polyethylene oxide, average molecular weight of 10 million), and 94 parts by mass of solvent C1 (acetonitrile) were prepared into a mixed solution R. Using the mixed solution R as the outer tube solution, and the inner tube through the solvent C2 (acetonitrile), the coaxial electrospinning was performed on the YFSP-GIII electrospinning equipment of Tianjin Yunfan Technology Co., Ltd. to obtain the composite hollow tube D. Spinning parameters: outer tube diameter 150nm; inner tube diameter 100nm; voltage 50kV; receiving distance 60cm.

[0078] 2) The hollow tube D was calcined at 300° C. for 12 hours to remove the polymer and sintered, and the tube length was shortened to 1 μm by a high-speed shearing machine to obtain the inorganic electro...

Embodiment 2- Embodiment 8

[0080] The preparation method of E2-E8 of the inorganic electrolyte tube body of Example 2 to Example 8 is basically the same as the method in Example 1, and the specific preparation parameters of each example are shown in Table 1.

[0081] Table 1

[0082]

[0083]

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Abstract

The invention provides a solid electrolyte and a preparation method thereof and a lithium ion battery. The solid electrolyte comprises the following components in percentage by mass: 0.1-80% of an inorganic electrolyte tube body and the balance of a polymer electrolyte. The solid electrolyte provided by the invention has more excellent lithium ion conductivity and mechanical strength.

Description

Technical field [0001] The invention relates to a solid electrolyte, in particular to a solid electrolyte and a preparation method thereof and a lithium ion battery, belonging to the technical field of secondary batteries. Background technique [0002] The solid-state lithium-ion battery uses a solid electrolyte to replace the liquid electrolyte of a traditional lithium-ion battery, and thus has the characteristics of high safety and high energy density. In recent years, solid-state lithium-ion batteries have been widely concerned and studied, and are considered to be one of the most promising next-generation batteries. [0003] However, at present, solid-state lithium-ion batteries are still far from commercial use, because the overall performance of solid-state lithium-ion batteries still has some shortcomings, for example, there is a gap with conventional liquid batteries in terms of cycle performance and low-temperature performance. The performance of solid-state lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02P70/50
Inventor 赵伟李素丽李俊义徐延铭
Owner ZHUHAI COSMX POWER SUPPLY CO LTD
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