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Composite gel polymer electrolyte applying polymer nanofiller, preparation method and solid-state lithium battery using electrolyte

A composite gel and polymer technology, used in non-aqueous electrolyte batteries, electrolyte immobilization/gelation, lithium batteries, etc.

Active Publication Date: 2020-10-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fillers reported so far are all inorganic. Although these inorganic fillers can mechanically block lithium dendrites to a certain extent, they cannot fundamentally solve the problem of non-uniform deposition of lithium ions at the electrode / electrolyte interface.

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  • Composite gel polymer electrolyte applying polymer nanofiller, preparation method and solid-state lithium battery using electrolyte
  • Composite gel polymer electrolyte applying polymer nanofiller, preparation method and solid-state lithium battery using electrolyte
  • Composite gel polymer electrolyte applying polymer nanofiller, preparation method and solid-state lithium battery using electrolyte

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Embodiment Construction

[0054] The invention proposes a composite gel polymer electrolyte, which is prepared from lithium electrolyte salt, polyurethane polymer and polyquinone nano sheet filler. After compounding with the above materials, an electrolyte material applied to a solid-state lithium battery can be prepared. In the technical solution of the present invention, polyquinone polymer is used as filler and thermoplastic polyurethane is used as polymer electrolyte matrix to prepare a gel polymer electrolyte containing polymer filler. The new conceptual design of gel polymer electrolytes containing polymer fillers is expected to provide many advantages, such as: (1) high ionic conductivity and strong mechanical strength; the polymer matrix used is polyurethane polymer, because its macromolecular chain contains Rich functional groups such as ether group, ester group, urea group, amide group, etc., so hydrogen bonds are easily formed between macromolecules, making it have good toughness; at the sam...

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Abstract

The invention discloses a composite gel polymer electrolyte applying polymer nanofiller, a preparation method and a solid-state lithium battery using the electrolyte. The composite gel polymer electrolyte comprises a polyurethane polymer, a polyquinone nanosheet filler and a lithium electrolyte salt. The polymer nanofiller provided by the invention has lithium affinity, so that the composite gel polymer electrolyte not only has flexibility, high room-temperature ionic conductance and good electrochemical and interface stability, but also can significantly inhibit the formation of lithium dendrites. When the electrolyte is used as the electrolyte of the lithium battery, the problems of liquid leakage and solvent volatilization of the traditional liquid electrolyte can be solved, and the lithium dendrites can be prevented from piercing the diaphragm to cause internal short circuit.

Description

technical field [0001] The invention belongs to the category of gel polymer electrolyte preparation, and the preparation of a composite gel polymer electrolyte mainly composed of a mixture of a polymer matrix and an organic polymer nanofiller (that is, a thermoplastic polyurethane polymer and polyquinone nanosheets) And applied to solid-state lithium batteries. Background technique [0002] Lithium metal is considered as a promising battery anode material because of its ultra-high theoretical specific capacity and extremely low redox potential. However, lithium dendrites are easily formed on the surface of lithium metal during the charge-discharge cycle to pierce the separator, which poses a major safety hazard to traditional liquid lithium batteries. Therefore, the practical application of metal lithium anodes faces a huge technical bottleneck. [0003] Compared with liquid electrolytes, gel polymer electrolytes are considered to be the most promising alternatives to liqu...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/052H01M10/0525
CPCH01M10/0565H01M10/052H01M10/0525H01M2300/0082H01M2300/0085Y02E60/10
Inventor 廖开明叶飞周嵬邵宗平
Owner NANJING UNIV OF TECH
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