Pyritoides additive used in anode of lithium-sulfur battery

A lithium-sulfur battery and additive technology, applied in the field of electrochemistry, can solve the problems of complex synthesis, unfavorable battery capacity and rate performance, and low conductivity, and achieve the effects of convenient preparation, accelerated electrochemical reaction rate, and low price

Active Publication Date: 2015-12-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of these matrix materials is complex, and the conductivity is low, which is not good for the capacity and rate performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Natural pyrite FeS 2 Grinding to millimeter-sized particles, mixed into sulfur / mesoporous carbon composites by co-grinding as cathode materials, in which FeS 2 The mass fraction is 5%. At the same time, a metal lithium sheet is used as the negative electrode, a polyethylene film is used as the diaphragm, and 1,3-dioxolane and ethylene glycol dimethyl ether solution of lithium bis(trifluoromethylsulfonyl)imide are used as the electrolyte to produce lithium sulfur Battery. At a charge-discharge rate of 0.05C, the addition of FeS 2 The initial capacity of the positive electrode reaches 1328mAh / g, and the decay rate of the first 100 cycles is about 0.06%. If FeS 2 Replaced by mesoporous carbon with equal mass, the initial capacity is only 1045mAh / g, and the capacity decay rate is higher (about 0.25%).

Embodiment 2

[0020] Synthesis of CoS on graphene oxide sheets by hydrothermal method 2 , to get the mutually combined CoS 2 - Graphene oxide composite, and then compounded with sulfur to form a positive electrode material, in which CoS 2 The mass fraction is 15%. At the same time, a metal lithium sheet is used as a negative electrode, a polypropylene film is used as a diaphragm, and an ethylene glycol dimethyl ether solution of lithium bis(trifluoromethylsulfonyl)imide and lithium nitrate is used as an electrolyte to manufacture a lithium-sulfur battery. At a charge-discharge rate of 0.5C, the introduction of CoS 2 The initial capacity of the positive electrode reaches 1285mAh / g, and the decay rate of the first 1000 cycles is about 0.04%. If the CoS 2 Replaced by graphene oxide with equal mass, the initial capacity is only 956mAh / g, and the capacity decay rate is higher (about 0.5%).

Embodiment 3

[0022] NiS obtained by co-heating nano-sized nickel and sulfur 2 , co-dispersed with carbon nanotubes in a solvent, assembled by suction filtration, and then compounded with sulfur to obtain a positive electrode, in which NiS 2 The quality score is 50%. At the same time, a lithium-boron alloy is used as the negative electrode, a polypropylene-polyethylene-polypropylene multilayer film is used as the diaphragm, and dimethyl carbonate and diethyl carbonate solutions of lithium hexafluorophosphate are used as the electrolyte to produce a lithium-sulfur battery. At a charge-discharge rate of 2.0C, the addition of NiS 2 The initial capacity of the positive electrode reaches 1054mAh / g, and the decay rate of the first 2000 cycles is about 0.03%. If NiS 2 Replaced by equal mass carbon nanotubes, the initial capacity is only 876mAh / g, and the capacity decay rate is higher (about 0.1%).

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PUM

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Abstract

The invention discloses a pyritoides additive used in the anode of a lithium-sulfur battery. The pyritoides additive is doped in an anode material framework through mechanical grinding or liquid-phase filtration, or anchored onto the anode material framework under the chemical action. The pyritoides additive comprises disulphide of VIII-group metal, diselenide of VIII-group metal, ditelluride of VIII-group metal, FexCo1-xS2 and CoyNi1-yS2, wherein 0<x<1, and 0<y<1. By means of the surface polarity and half-metallicity of pyritoides substances, the redox reaction rate of polysulfide intermediate products is increased in the anode of the lithium-sulfur battery, and then the capacity and stability of the anode are improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a pyrite additive used in the positive electrode of a lithium-sulfur battery. Background technique [0002] The development of mobile electronic devices, electric vehicles, and large-scale energy storage places higher requirements on the energy density of energy storage systems, while common commercial secondary batteries (lead-acid batteries, lithium-ion batteries, etc.) have lower energy Density (less than 200Wh / kg) can no longer meet this demand. In recent years, lithium-sulfur batteries have attracted extensive attention due to their high energy density of 2600 Wh / kg. As a positive electrode active material, sulfur has a high theoretical capacity of 1672mAh / g, and has the advantages of being cheap, easy to obtain, and environmentally friendly. [0003] Due to the insulating properties of sulfur itself, it has become an important method to introduce nano...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/39
CPCH01M4/62H01M10/39Y02E60/10
Inventor 张强元喆彭翃杰黄佳琦
Owner TSINGHUA UNIV
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