Flexible lithium metal negative electrode framework material as well as preparation method and application thereof

A lithium metal negative electrode and skeleton material technology, which is applied to the flexible lithium metal negative electrode skeleton material and its preparation. The application field of the flexible lithium metal negative electrode skeleton material in the lithium metal battery negative electrode field can solve the problems of battery cycle performance degradation and thermal failure. , to achieve the effect of low material cost and simple preparation process
CN110993892AActive Publication Date: 2020-04-10CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2020-04-10

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Abstract

The invention discloses a flexible lithium metal negative electrode framework material as well as a preparation method and application thereof. The invention belongs to the field of lithium metal battery materials. The framework material is a three-dimensional nanofiber framework modified by lithium fluoride, the diameter of the three-dimensional nanofibers in the framework is 50-900 nm, the lithium fluoride particles are uniformly anchored in the three-dimensional nanofibers, the interiors of three-dimensional nanofiber frameworks are communicated and are three-dimensional and porous, the three-dimensional nanofiber frameworks have good flexibility and can be bent within 0-180 degrees, and the framework material is prepared from a high polymer mixed with the lithium fluoride particles through electrostatic spinning and heat treatment. The composite lithium metal negative electrode obtained by plating a flexible frameworkwith lithium shows good cycling stability during cycling, and ismatched with lithium iron phosphate to form a whole battery, under the condition of 5C, the capacity retention ratio can be 89% after 1600 circles, and the lithium metal battery obtained by using theframework can obtain high coulombic efficiency and long cycle life.
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Description

technical field

[0001] The invention belongs to the field of lithium metal battery materials, and relates to a flexible lithium metal negative electrode framework material and its preparation method and application, in particular to the application of a flexible lithium metal negative electrode framework material in the field of lithium metal battery negative electrodes. Background technique

[0002] Lithium metal anode because of its extremely high theoretical energy density (3680mAhg -1 ), and has a low electrochemical potential (-3.04V), has become the most potential next-generation lithium battery anode material. However, lithium metal batteries have not been industrialized for a long time. That is because lithium metal is active in nature, and it is easy to contact with the electrolyte to form a fragile SEI film. During the cycle, this SEI film is easy to break, which will lead to new lithium and electrolyte The liquid reaction produces defects, these defects lead to t...

Claims

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