Composite lithium metal negative electrode and preparation method thereof

A metal negative electrode and composite lithium technology, applied in negative electrodes, battery electrodes, lithium batteries, etc., can solve the problems of affecting the service life of lithium metal batteries, difficult Li uniform deposition, high nucleation overpotential, etc., to reduce lithium nucleation Effects of overpotential, increased cycle stability, and increased service life

Active Publication Date: 2021-01-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the three-dimensional skeleton materials, such as nickel foam, copper foam and carbon fiber, have poor lithium affinity, high Li nucleation overpotential, and are not easy to uniformly deposit Li, which will affect the service life of lithium metal batteries.

Method used

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  • Composite lithium metal negative electrode and preparation method thereof
  • Composite lithium metal negative electrode and preparation method thereof
  • Composite lithium metal negative electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Put 100mg of graphene oxide and 100mg of 1-butyl-3-methylimidazolium chloride (BMIMCl) into a 25mL round-bottomed flask, stir well, and ultrasonicate at room temperature for 1h; then add 20mg of silver nitrate to it, Continue to sonicate for 0.5h to obtain a brown mixture;

[0031] (2) Add 0.2 g of sodium citrate to the mixture obtained in step (1), stir evenly, transfer it to a 25 mL polytetrafluoroethylene reactor, and place it in a thermostat at 180° C. for 20 hours to obtain a gel-state mixture . After washing the gel-state mixture with deionized water, place it in a freeze dryer for 48 hours to obtain a metal heterogeneous particle / reduced graphene oxide composite material;

[0032](3) Cut single-layer nickel foam with a direct slicer, a 10mm diameter disc, take a piece and put it into the mold; it is also called the foam that 1.5mg of metal heterogeneous particles / reduced graphene oxide composite material is evenly sprinkled in the mold On nickel, a lithium-...

Embodiment 2

[0036] (1) 100mg graphene oxide and 100mg 1-butyl-3-methylimidazolium bisulfate (BMIMHSO 4 ) into a 25mL round-bottomed flask, stirred evenly, and ultrasonicated at room temperature for 1 hour; then added 100 mg of silver nitrate to it, and continued ultrasonication for 0.5 hour to obtain a brown mixture;

[0037] (2) Add 0.2 g of sodium citrate to the mixture obtained in step (1), stir evenly, transfer it to a 25 mL polytetrafluoroethylene reactor, and place it in a thermostat at 180° C. for 20 hours to obtain a gel-state mixture . After washing the gel-state mixture with deionized water, place it in a freeze dryer for 48 hours to obtain a metal heterogeneous particle / reduced graphene oxide composite material;

[0038] (3) Cut single-layer nickel foam with a direct slicer, a 10mm diameter disc, take a piece and put it into the mold; it is also called the foam that 6.67mg of metal heterogeneous particles / reduced graphene oxide composite material is evenly sprinkled in the mol...

Embodiment 3

[0041] (1) 100mg graphene oxide and 100mg 1-methyl-3-ethylimidazole dihydrogen phosphate (EMIMH 2 PO 4 ) into a 25mL round-bottomed flask, stirred evenly, and ultrasonicated at room temperature for 1 hour; then added 10 mg of chloroauric acid, and continued ultrasonication for 0.5 hour to obtain a brown mixture;

[0042] (2) Add 0.2 g of sodium citrate to the mixture obtained in step (1), stir evenly, transfer to a 25 mL polytetrafluoroethylene reactor, and place it in a thermostat at 150° C. for 20 hours to obtain a gel-state mixture . After washing the gel-state mixture with deionized water, place it in a freeze dryer for 48 hours to obtain a metal heterogeneous particle / reduced graphene oxide composite material;

[0043] (3) Cut single-layer nickel foam with a direct slicer, a 10mm diameter disc, take a piece and put it into the mold; it is also called the foam that 6.67mg of metal heterogeneous particles / reduced graphene oxide composite material is evenly sprinkled in th...

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Abstract

The invention provides a composite lithium metal negative electrode and a preparation method thereof, and belongs to the technical field of lithium metal batteries. The composite lithium metal negative electrode comprises metal lithium and a lithium-philic composite framework material; wherein the lithium-philic composite framework material comprises a metal framework material, metal heterogeneousparticles and a reduced graphene oxide material. According to the method, the graphene oxide is reduced through ionothermal, the interlayer spacing of the reduced graphene oxide is enlarged, and thespace for accommodating lithium is increased; after a metal precursor and a reducing agent are added, the metal heterogeneous particles grow on the reduced graphene oxide layer in situ, so that the lithium nucleation overpotential is reduced; and lithium is uniformly deposited on the lithium-philic composite framework material through an electrochemical deposition method to form a composite lithium metal negative electrode. The obtained composite lithium metal negative electrode is simple in preparation process and can effectively inhibit growth of lithium dendrites, so that the service life of a lithium metal negative electrode battery is greatly prolonged, and the cycling stability of the lithium metal negative electrode battery is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and in particular relates to a composite lithium metal negative electrode and a preparation method thereof. Background technique [0002] With the rapid development of portable electronic devices, drones, electric vehicles and other fields, the commercialized lithium-ion secondary batteries can no longer meet the urgent needs of today's market. Finding anode materials with high specific capacity and high energy density has become the key to solving current problems. The commercialized lithium-ion anode material is graphene-based material. This type of material has low price, good cycle stability, and low density, but its theoretical capacity is low, only 372mAh g -1 , it is difficult to meet the demand for high energy density and high specific volume in today's market. Among the many known electrode materials, metal lithium has the smallest density (0.534g cm -3 ), high theore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/052
CPCH01M4/134H01M4/1395H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 颜洋张颖李培权
Owner DALIAN UNIV OF TECH
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