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

Active Publication Date: 2020-04-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of lithium dendrites existing in lithium metal as the negative electrode of batteries, infinite volume expansion, degradation of battery cycle performance, short circuit, thermal failure and series of safety problems caused by uneven deposition, the purpose of the present invention is to provide a flexible lithium metal negative electrode framework Materials and their preparation methods and applications

Method used

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

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Embodiment 1

[0037] The invention provides a method for preparing a flexible lithium metal negative electrode framework material, comprising the following steps:

[0038] (1) Mix 1g of lithium fluoride particles with 20ml of alcohol and then perform high-performance ball milling. During the ball milling process: use large ball milling beads with a diameter of 9mm and small ball milling beads with a diameter of 4mm, and the ratio of the numbers is 1:12. The ball milling beads are made of stainless steel balls, the milling medium is alcohol, the ball-to-material ratio is 30:1, and the milling time is 3 hours;

[0039] Then crush the ball-milled lithium fluoride particles with a cell disruptor for 30 minutes, and then dry them in a blast drying oven at 60°C for 12 hours to obtain the processed lithium fluoride particles;

[0040] (2) Dissolve 0.1 g of the above-mentioned treated lithium fluoride particles and 0.8 g of polyacrylonitrile (PAN, Mw=130,000) in 10 mL of DMF, and rotate and stir at...

example 1

[0042] The high-resolution figure of the material that example 1 makes is as figure 1 As shown, the fiber diameter of lithium fluoride-modified oxidized polyacrylonitrile nanofiber framework (OPAN-LiF) is about 300 nm, and the internal three-dimensional crosslinking. The XPS F 1s spectrum of the material that embodiment 1 makes is as figure 2 shown.

Embodiment 2

[0049] In order to test the inhibitory effect of the OPAN-LiF framework material on the growth of lithium dendrites and the improvement of the Coulombic efficiency, a lithium-copper half-cell was assembled for testing. Place the obtained OPAN-LiF pole piece on the top of the copper foil, use metal lithium as the counter electrode, and the electrolyte solution is 1M lithium bistrifluoromethanesulfonylimide (LiTFSI) dissolved in 2% LiNO 3 1,3-dioxolane (DOL) / ethylene glycol dimethyl ether (DME) (1:1w / w).

[0050] The assembled half-cells were tested at a current density of 1 mA cm -2 , surface capacity 1mAh cm-2 Under the condition of , its cycle number-coulombic efficiency curve see image 3 .

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/052D01F6/54D01F6/50D01F1/10
CPCD01F1/10D01F6/50D01F6/54H01M4/134H01M4/1395H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 潘安强周双
Owner CENT SOUTH UNIV
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