A positive electrode material for lithium-sulfur battery positive electrode and its preparation and application

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of sulfur electrochemical inertness and poor cycle stability, reduced battery charge and discharge efficiency, and low electrode capacity utilization, etc. The effect of cycle stability, good selectivity, good catalytic activity

Active Publication Date: 2017-09-26
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

[0004] However, its practical application is limited due to the electrochemical inertness and poor cycle stability of sulfur.
The reduction of elemental sulfur to lithium sulfide is a multi-step reaction such as Figure 4 Shown, S 8 Restore to go through S 6 - , S 4 - , S 2 - , S 2- Intermediate state, from S 8 Direct conversion to lithium sulfide reaction has a higher energy barrier and the reaction is more difficult
Moreover, the intermediate product of the electrochemical reaction with sulfur is easily soluble in the electrolyte, causing a large loss of active substances, reducing the electrode capacity, increasing the viscosity of the electrolyte, decreasing the ion conductivity, and deteriorating the electrode performance.
The "Shuttle" effect of soluble polysulfides leads to a decrease in battery charge and discharge efficiency and low electrode capacity utilization, while insoluble lithium sulfide deposits and agglomerates on the electrode surface, destroying the electrode structure and reducing the cycle performance of the battery

Method used

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  • A positive electrode material for lithium-sulfur battery positive electrode and its preparation and application
  • A positive electrode material for lithium-sulfur battery positive electrode and its preparation and application
  • A positive electrode material for lithium-sulfur battery positive electrode and its preparation and application

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Experimental program
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Effect test

Embodiment 1

[0039] Take 0.83ml of ammonium molybdate aqueous solution with a concentration of 133.6mgMo / ml, add appropriate amount of water and isopropanol and ultrasonically mix it evenly (the mass percentage of ammonium molybdate is 5%), add conductive carbon Ketjen black, Ketjen black The mass percentage is 50%, stirred for half an hour to mix evenly, and soaked for 12 hours. The above mixture was slowly evaporated on a water bath at 90°C until the surface was dry, and then dried in a vacuum oven at 120°C for 2 hours; then the sample was moved into a tube furnace for sintering and nitriding. The roasting condition is N 2 In the atmosphere, the temperature was raised to 500°C at a constant temperature of 5°C / min for 2 hours, and then lowered to room temperature. Then pass 60ml / min of NH 3 Raise the temperature from room temperature to 623K at 5K / min; then raise the temperature from 623K to 723K at a speed of 0.5K / min, then raise the temperature from 723K to 973K at 2.5K / min, keep the ...

Embodiment 2

[0044] Take 0.25ml of ammonium metatungstate aqueous solution with a concentration of 441.216mgW / ml, add appropriate amount of water and isopropanol and ultrasonically mix it evenly (ammonium metatungstate mass percentage is 60%), add carbon nanotubes, carbon nanotubes The mass percentage is 10%, stirred for half an hour to mix evenly, and soaked for 12 hours. The above mixture was slowly evaporated on a water bath at 90°C until the surface was dry, and then dried in a vacuum oven at 120°C for 12 hours; then the sample was moved into a tube furnace for sintering and nitriding. The roasting condition is N 2 In the atmosphere, the temperature was raised to 500°C at a constant temperature of 5°C / min for 2 hours, and then lowered to room temperature. Then pass 60ml / min of NH 3 Raise the temperature from room temperature to 623K at 5K / min; then raise the temperature from 623K to 723K at a speed of 0.5K / min, then raise the temperature from 723K to 1025K at 2.5K / min, keep the tempe...

Embodiment 3

[0046] The precursor oxide of supported cobalt molybdenum nitride is impregnated: 0.59ml of Co(NO with a concentration of 134.4mgCo / ml 3 ) 2 ·6H 2 O aqueous solution was slowly added to 0.96ml of ammonium molybdate aqueous solution with a concentration of 133.6mgMo / ml, and the mixed solution was immersed in 0.5g of carbon nanofibers, stirred for half an hour to mix evenly, and then immersed for 12h. The above mixture was slowly evaporated on a water bath at 90°C until the surface was dry, and then dried in a vacuum oven at 120°C for 12 hours; then the sample was moved into a tube furnace for sintering and nitriding. The roasting condition is N 2 In the atmosphere, the temperature was raised to 500°C at a constant temperature of 5°C / min for 2 hours, and then lowered to room temperature. Then pass 60ml / min of NH 3 Raise the temperature from room temperature to 623K at 10K / min; then raise the temperature from 623K to 723K at a speed of 0.5K / min, then raise the temperature fro...

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Abstract

The invention relates to a positive electrode material used for the positive electrode of a lithium-sulfur battery and its preparation and application. It uses carbide or nitride of one or more than two metal elements in transition metals as the catalytic component; elemental sulfur as the active component; the catalytic component is first loaded on the carrier, and then the active component is loaded again On the carrier loaded with catalytic components; the content of catalytic components is 2-30% of the total weight of the positive electrode material, the content of sulfur is 30-80% of the total weight of the positive electrode material, and the balance is the carrier. When this positive electrode material is used as the positive electrode of lithium-sulfur batteries, it shows good selectivity for the reduction of elemental sulfur; it reduces the reaction energy barrier required for sulfur reduction, reduces the reaction polarization, and improves the discharge voltage platform. This type of catalyst is environmentally friendly, low in cost and abundant in resources.

Description

technical field [0001] The invention relates to a positive pole of a lithium-sulfur battery, in particular to a positive pole material and its preparation and application. Background technique [0002] In recent years, with the continuous advancement of science and technology and the rapid development of various electronic products, the chemical power sources used are required to have the characteristics of light weight, small size, and large capacity. In order to meet the needs of society and greatly increase the energy density of batteries, the development of new materials and new systems is necessary. [0003] The lithium-sulfur secondary lithium battery is one of the battery systems with a relatively high theoretical discharge capacity among known lithium-ion batteries. Among the cathode materials for batteries, elemental sulfur is abundant, cheap and environmentally friendly. The density of elemental sulfur is 1.96g / cm 3 , with a theoretical specific capacity of 1675...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/58
CPCY02E60/10Y02E60/50
Inventor 王美日张华民张洪章马艺文
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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