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Cathode material used for lithium-sulfur secondary battery

A lithium-sulfur secondary battery and cathode material technology, which is applied in the field of electrochemical energy storage, can solve the problems of complex methods and inability to achieve cathode performance, and achieves the effects of easy preparation, low price, and easy acquisition.

Inactive Publication Date: 2016-09-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods of physical coating and chemical adsorption are relatively complicated, and it is still impossible to achieve a positive electrode performance close to practical use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Adding titanium nitride particles with a particle size of 1 nanometer into the mesoporous carbon / sulfur composite material, and blending the coating film with the binder and the conductive agent to form the cathode material. The mass fraction of titanium nitride in the cathode material is 0.05%. At the same time, lithium metal sheet is used as the negative electrode, polyethylene film is used as the diaphragm, and 1,3-dioxolane and glycol dimethyl ether solution of lithium bis(trifluoromethylsulfonyl)imide are used as the electrolyte to make lithium-sulfur batteries. . The addition of titanium nitride particles improves the adsorption of polysulfides and the oxidation-reduction catalytic activity of the positive electrode, thereby improving the capacity and stability of the positive electrode. At a charge-discharge rate of 0.01C, the specific capacity of the cathode material can reach 1229mAh / g, and the single-turn decay rate in the first 100 cycles is about ...

Embodiment 2

[0017] Embodiment 2: adding vanadium nitride particles with a particle size of 2 nanometers into a microporous carbon / sulfur composite material, and blending the coating film with a binder and a conductive agent to form a positive electrode material. The mass fraction of vanadium nitride in the cathode material is 0.02%. At the same time, lithium metal sheet is used as the negative electrode, polyethylene film is used as the diaphragm, and 1,3-dioxolane and glycol dimethyl ether solution of lithium bis(trifluoromethylsulfonyl)imide are used as the electrolyte to make lithium-sulfur batteries. . The addition of vanadium nitride particles improves the positive electrode's polysulfide adsorption and redox catalytic activity, thereby improving the positive electrode capacity and stability. At a charge-discharge rate of 0.5C, the specific capacity of the cathode material can reach 1080mAh / g, and the single-turn decay rate in the first 100 cycles is about 0.06%. Without the additio...

Embodiment 3

[0018] Embodiment 3: Adding iron nitride particles with a particle size of 5 nanometers into the graphene / sulfur composite material, and blending the coating film with the binder and the conductive agent to form the positive electrode material. The mass fraction of iron nitride in the cathode material is 0.20%. At the same time, lithium metal sheet is used as the negative electrode, polyethylene film is used as the diaphragm, and 1,3-dioxolane and glycol dimethyl ether solution of lithium bis(trifluoromethylsulfonyl)imide are used as the electrolyte to make lithium-sulfur batteries. . The addition of iron nitride particles improves the absorption of polysulfides and the oxidation-reduction catalytic activity of the positive electrode, thereby improving the capacity and stability of the positive electrode. At a charge-discharge rate of 1C, the specific capacity of the cathode material can reach 980mAh / g, and the single-turn decay rate in the first 100 cycles is about 0.07%. Wi...

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Abstract

The invention relates to a cathode material used for a lithium-sulfur secondary battery. The cathode material is characterized in that transition metal nitrides are contained in the cathode material. The transition metal nitrides are anchored on the surface of a carbon substrate well to form a conductive network together by using higher conductivity of the transition metal nitrides and affinity with the carbon substrate; moreover, the redox liquid phase conversion reaction speed of a polysulfide intermediate product is strengthened in the cathode reaction process of the lithium-sulfur battery by using the polarity characteristics of the metal nitrides, the utilization rate of the sulfur active material in the lithium-sulfur battery is improved, and the cathode material is beneficial for promoting the practicability of sulfur in the lithium-sulfur secondary battery.

Description

Invention field [0001] The invention relates to the field of electrochemical energy storage, in particular to a positive electrode material for lithium-sulfur secondary batteries. Background technique [0002] With the development of modern industry, gradually using sustainable energy to replace existing fossil energy has become the only way for the sustainable development of future energy and environment. At the same time, the development of the modern electronics industry has also increased people's demand for the performance of electronic equipment. Both types of equipment will require secondary batteries with higher energy density as energy storage and conversion media in the future. After years of development, the energy density of the traditional lithium-ion battery system has approached its theoretical value. It is difficult to make a major breakthrough. It is urgent to develop a battery system with higher energy density to replace the existing lithium-ion secondary batte...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/052
CPCH01M4/364H01M4/5815H01M10/052Y02E60/10
Inventor 张强黄佳琦彭翃杰
Owner TSINGHUA UNIV
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