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Cathode material for lithium-sulfur battery and preparation and application

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as lithium ion transmission inhibition

Active Publication Date: 2016-01-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to better reduce the dissolution of polysulfides, it is often necessary to have a thicker coating of carbon materials. Although better conductivity is ensured, the transmission of lithium ions is significantly inhibited.

Method used

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  • Cathode material for lithium-sulfur battery and preparation and application
  • Cathode material for lithium-sulfur battery and preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 0.05molS simple substance, 0.05molNa 2 S. Put 0.01mol of PVP into 50ml of deionized water, ultrasonically disperse for 2 hours, control the pH value to 7, then slowly add 0.05mol of zinc acetate, and react at 30°C for 10 hours. After the reactant was naturally cooled, it was alternately washed with ethanol and deionized water three times, filtered with suction, and then dried at a constant temperature at 50°C for 24 hours to obtain the target product. Battery 0.05C charge and discharge cycle performance see figure 1 , the capacity of the battery still reaches 500mAh / g after 450 cycles, and the capacity retention rate is 62.5%.

Embodiment 2

[0031] 0.05molS simple substance, 0.05mol / LNa 2 S. Put 0.05mol Nafion into 50ml deionized water, ultrasonically disperse for 2 hours, control the pH value to 6, then add 0.1mol zinc acetate, move the mixture into a high-pressure reactor and seal it, and react at 60°C for 10 hours. After the reactant was naturally cooled, it was alternately washed with ethanol and deionized water three times, filtered with suction, and then dried at a constant temperature at 50°C for 24 hours to obtain the target product. Battery 0.05C charge and discharge cycle performance see figure 2 , the capacity of the battery still reaches 400mAh / g after 300 cycles, and the capacity retention rate is 58%.

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Abstract

The invention relates to a cathode material for a lithium-sulfur battery and preparation and an application of the cathode material. The cathode material comprises elemental sulfur particles and metal sulfides, wherein one or more than two metal sulfides coat the surfaces of the elemental sulfur particles; and the metal of the metal sulfides is one or more than two of Zn, Fe, Cd, Pb, Cu or Ag. The metal sulfides have semiconductor properties, so that certain electron conductivity can be provided; the metal sulfides have good lithium ion transmission capabilities; lithium ion transmission in a tight coating condition is ensured; coating of the metal sulfides on the elemental sulfur surface can be achieved in a mild chemical environment; and the method is simple and feasible.

Description

technical field [0001] The invention relates to the field of lithium-sulfur secondary battery materials and preparation thereof, in particular to a lithium-sulfur battery cathode material and a preparation method. Background technique [0002] With the increasing demand of portable electronic products, high energy density rechargeable batteries have gradually become the focus of research. Lithium-ion battery is the secondary battery with the best comprehensive performance at present, and has been widely used in portable electronic products such as mobile phones, digital cameras, notebook computers and electric tools. With the rapid development of various scales of energy storage power stations, electric vehicles, and smart grids, the requirements for the energy density and power density of lithium-ion batteries are also getting higher and higher. However, limited by the theoretical lithium storage capacity of the battery system and electrode materials, the specific energy o...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/10
Inventor 王倩张华民张洪章王美日曲超
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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