Metal lithium composite negative electrode material and preparation method and application thereof

A negative electrode material, metal lithium technology, applied in the field of metal lithium composite negative electrode materials and its preparation, can solve the problems of short life, serious side reactions, low Coulombic efficiency, etc., achieve high mechanical strength, high production controllability, and promote migration Effect

Active Publication Date: 2020-04-24
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the prior art above, the present invention provides a metal lithium composite negative electrode material and its preparation method and application, so as to solve the problems caused by the metal lithium negative electrode material in the battery cycle process. Serious side reactions, low Coulombic efficiency and short lifespan caused by lithium dendrite growth

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  • Metal lithium composite negative electrode material and preparation method and application thereof
  • Metal lithium composite negative electrode material and preparation method and application thereof
  • Metal lithium composite negative electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A metal lithium composite negative electrode material, which is prepared through the following steps:

[0030] S1: Heat metal lithium to 200-1200°C to make the metal lithium into a molten state, add elemental silicon (Si) to the molten metal lithium, keep it warm for 5-60 minutes, mix evenly, form a molten lithium-silicon alloy, and let stand , cooled to room temperature to obtain a lithium-silicon alloy material, wherein the molar ratio of silicon (Si) to lithium metal is 1:30;

[0031] S2: Take 1g of polymethyl methacrylate (PMMA) in a 20mL glass bottle, add 10mL of dimethylformamide (DMF), stir and dissolve to obtain a polymer solution;

[0032] S3: After the polymethyl methacrylate is completely dissolved, add 0.178g of lithium bistrifluoromethylsulfonimide (LiTFSI) to it, and mechanically stir to obtain a uniformly dispersed polymer electrolyte solution; the polymethyl methacrylate in the polymer electrolyte solution The mixing molar ratio of methyl acrylate and l...

Embodiment 2

[0035] A metal lithium composite negative electrode material, which is prepared through the following steps:

[0036] S1: Add 10g of ethylene vinyl alcohol copolymer (ethylene=38%) and 100mL of dimethylformamide (DMF) to the round bottom flask, stir at a constant speed and maintain the temperature at 90°C to dissolve; when the ethylene vinyl alcohol copolymer is completely dissolved, stop Heat it, let it cool to 40° C., then add 0.1 g of sodium hydroxide thereto, continue stirring, then add 24.7 mL of acrylonitrile dropwise, and carry out stirring at about 40° C. for 5 hours to carry out contact of ethylene vinyl alcohol and acrylonitrile Branch reaction;

[0037] S2: Take 10 mL of the ethylene vinyl alcohol graft mixture solution obtained in S1 in a 20 mL glass bottle, add 0.252 g of lithium bistrifluoromethanesulfonimide (LiTFSI) to it and stir overnight to obtain a polymer electrolyte solution; The mixing molar ratio of the graft copolymer in the polymer electrolyte soluti...

Embodiment 3

[0040] A metal lithium composite negative electrode material, which is prepared through the following steps:

[0041] S1: Heat metallic lithium to 200-800°C to make the metallic lithium a molten state, add metallic copper (Cu) to the molten metallic lithium, keep it warm for 5-60 minutes, mix evenly, form a molten alloy, let stand, and cool To room temperature, obtain lithium-copper alloy material, wherein, the mol ratio of copper (Cu) and metal lithium is 1:60;

[0042] S2: Take 0.5g polyvinylidene fluoride: (PVDF) in a 20mL glass bottle, add 10mL dimethylformamide (DMF), stir and dissolve to obtain a polymer solution;

[0043] S3: After polyvinylidene fluoride is completely dissolved, add 5 mg of aluminum oxide (Al 2 o 3 ), ultrasonic until uniformly dispersed, then add 0.062g lithium perchlorate (LiClO 4 ), mechanical stirring to obtain a uniformly dispersed polymer electrolyte solution;

[0044] S4: Take a certain amount of polymer electrolyte solution and coat it on m...

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Abstract

The invention discloses a metal lithium composite negative electrode material and a preparation method and application thereof, and belongs to the field of lithium metal secondary batteries. The metallithium composite negative electrode material is composed of a metal lithium-containing substrate and a polymer electrolyte protective film coating the metal lithium-containing material. During preparation, the surface of a substrate containing metal lithium is coated with a polymer electrolyte solution, and a polymer electrolyte protective film is formed on the surface of the substrate containing metal lithium after the solvent is completely volatilized. The preparation method of the composite material is simple, the raw materials are safe and easy to obtain, the cost is low, and large-scaleproduction is easy. When the obtained metal lithium composite negative electrode material is applied to a metal secondary battery, generation of lithium dendrites can be inhibited, the coulombic efficiency of the battery can be effectively improved, and the cycle life of the battery can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a lithium metal composite negative electrode material and a preparation method and application thereof. Background technique [0002] With the rapid consumption of non-renewable fossil fuels and the continuous deterioration of the environment, replacing fossil fuels with green new energy has become a major research direction. Due to its high energy density, lithium batteries can not only provide ideal energy for portable electronic products such as mobile phones and computers, but also meet the needs of high safety, high energy density and high rate of new energy electric vehicles in the future. Advantages are playing an increasingly important role in people's lives. Therefore, research on a new generation of electrode materials with high energy storage density is imminent. Lithium metal has attracted extensive research attention due to its ultra-high capa...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M10/052
CPCH01M4/134H01M4/1395H01M10/052Y02E60/10
Inventor 李晶泽姚泽宇李坤艳贾维尚
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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