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Nitrogen-doped composite planar metal lithium anode, preparation and application of nitrogen-doped composite planar metal lithium anode in lithium metal battery

A composite plane, metal lithium technology, used in lithium batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of low Coulomb efficiency and large volume effect, achieve long cycle life, relieve dendrites, and relieve expansion and contraction.

Active Publication Date: 2020-03-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of dendrites, low coulombic efficiency, and large volume effect in existing lithium metal anodes, the present invention aims to provide a nitrogen-doped composite planar metal lithium anode, which aims to improve the obtained lithium metal anode by setting the electrode material. Electrical properties of the anode

Method used

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  • Nitrogen-doped composite planar metal lithium anode, preparation and application of nitrogen-doped composite planar metal lithium anode in lithium metal battery
  • Nitrogen-doped composite planar metal lithium anode, preparation and application of nitrogen-doped composite planar metal lithium anode in lithium metal battery
  • Nitrogen-doped composite planar metal lithium anode, preparation and application of nitrogen-doped composite planar metal lithium anode in lithium metal battery

Examples

Experimental program
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Effect test

Embodiment 1

[0057] Carbon nanocages with internal chambers (with a specific surface area of ​​104.7 m 2 / g, the carbon wall thickness is 6nm, and the size of the inner cavity accounts for 92% of the total volume)( figure 1 ) placed in an argon atmosphere containing ammonia (ammonia content 50vol.%), after heat treatment at 800° C. for 3 h, nitrogen-doped carbon nanocages (nitrogen doping amount is 2.2 at.%). Then mixed with polyvinylidene chloride according to the mass ratio of 90% (nitrogen-doped carbon nanocages / polyvinylidene chloride is 90%), and then coated on copper foil (8μm) to prepare double-sided nitrogen-doped carbon nanocages Modified copper foil electrodes (30 μm coating thickness). This electrode is used as the working electrode, and the metal lithium sheet is used as the counter electrode, and 1 MLiTFSI / DOL: DME (volume ratio = 1: 1) contains 1wt.% LiNO 3 Carry out pouch battery assembly for the electrolyte, at 3mA / cm 2 Under the current density, the charge-discharge cyc...

Embodiment 2

[0067] Example 1 full battery case:

[0068] The copper foil electrode modified by the nitrogen-doped carbon nano-cage prepared in Example 1 is used as a working electrode, and then at 1mA / cm 2 At a current density of 5mAh / cm 2 On the copper foil electrode modified by nitrogen-doped carbon nanocages to prepare a composite negative electrode material, and then form a soft-packed lithium-sulfur battery with a mesoporous carbon positive electrode rich in S, in 1M LiTFSI / DOL:DME (volume ratio=1:1) Contains 1wt.% LiNO 3 In the electrolyte solution, the charge-discharge cycle test was carried out at 1C. The relevant results of the tests are shown in Table 2.

Embodiment 3

[0078] Carbon nanocages with internal cavities (with a specific surface area of ​​232.7m 2 / g, the carbon wall thickness is 7nm, and the internal cavity size accounts for 94% of the total volume) is placed in the argon atmosphere (nitrogen content 40vol.%) containing nitrogen, after 800 ℃ of heat treatment 5h, the nitrogen-doped carbon nanocage ( Nitrogen doping amount is 2.2 at.%). Then mixed with polyvinylidene chloride according to the mass ratio of 90%, and then coated on copper foil, titanium foil, nickel foil, iron foil, cobalt foil (20μm) to prepare double-sided nitrogen-doped carbon nanocage modified copper Foil, titanium foil, nickel foil, iron foil, cobalt foil electrode (coating layer thickness is 60μm). These electrodes are used as working electrodes, and metal lithium sheets are used as counter electrodes, with 1M LiTFSI / DOL:DME (volume ratio=1:1) containing 1wt.% LiNO 3 Carry out pouch battery assembly for the electrolyte, at 4mA / em 2 Under the current density...

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Abstract

The invention discloses preparation and application of a nitrogen-doped composite planar metal lithium anode. The nitrogen-doped composite planar metal lithium anode is composed of a flat plate current collector, nitrogen-doped hollow carbon nanocages, adhesive active layers and metal lithium, wherein the nitrogen-doped hollow carbon nanocages and the adhesive active layers uniformly cover two sides of the planar metal current collector, and metal lithium exists in the nitrogen-doped hollow carbon nanocages. The nitrogen-doped composite planar metal lithium anode has the advantages that the existence of the hollow carbon nanocages with high specific surface area effectively reduces the overpotential in during the nucleation and deposition of lithium metal, and the doping of nitrogen atomsprovides uniform nucleation and deposition sites, so that the lithium metal intends to grow into the hollow carbon nanocages, thereby achieving uniform deposition and dissolution in the continuous cycle process of the lithium metal. In addition, the ultrathin carbon wall effectively prevents the interface reaction from happening, and the cycle life of the lithium metal battery is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to the field of electrode materials for metal lithium batteries. Background technique [0002] Commercial lithium-ion batteries have been widely used in 3C electronic products. However, limited by the theoretical specific capacity (372mAh / g) of graphite negative electrodes, it is difficult for lithium batteries composed of graphite negative electrodes to break through the bottleneck of energy density of 250Wh / kg. Therefore, its application in smart grid, electric vehicle and other fields is greatly restricted. Therefore, it is imminent to develop lithium batteries with higher energy density. [0003] Lithium metal has attracted much attention because of its high theoretical specific capacity of 3860mAh / g. Lithium-sulfur batteries and lithium-air batteries composed of metallic lithium can exhibit ultra-high energy densities of 2600 Wh / kg and 3500 Wh / kg, respective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/0404H01M4/0452H01M4/134H01M4/1395H01M4/362H01M4/382H01M4/62H01M4/628H01M10/052Y02E60/10
Inventor 赖延清洪波范海林向前张治安张凯
Owner CENT SOUTH UNIV
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