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Positive electrode material of lithium-sulfur battery, preparation method of positive electrode material and lithium-sulfur battery

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, electrode manufacturing, etc., can solve the problems of active material loss, battery kinetic performance deterioration, internal resistance increase, etc.

Active Publication Date: 2020-07-17
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, under the action of electric field and concentration gradient in the long-chain lithium polysulfide, it will migrate back and forth between the positive and negative electrodes, and the long-chain LiS x Migration into the electrolyte will increase the viscosity of the electrolyte and reduce the ion conductivity; long-chain LiS x Migration to the separator will cause the membrane to block pores, increase internal resistance, and deteriorate battery kinetics; long-chain LiS x With extremely strong reactivity, migrating to the negative electrode will destroy the solid electrolyte interface film (SEI film) of the negative electrode. In addition, the long-chain LiS x It will also directly react with metal lithium to deactivate metal lithium and pulverize it.
In summary, the shuttle effect (Shuttle effect), known as polysulfide, leads to the loss of active materials and the waste of electrical energy

Method used

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  • Positive electrode material of lithium-sulfur battery, preparation method of positive electrode material and lithium-sulfur battery
  • Positive electrode material of lithium-sulfur battery, preparation method of positive electrode material and lithium-sulfur battery
  • Positive electrode material of lithium-sulfur battery, preparation method of positive electrode material and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 10g of activated carbon-sulfur cathode material and disperse it in a cobalt nitrate hexahydrate solution with a concentration of 2g / L, disperse it by ultrasonic for 20min, impregnate with magnetic stirring for 10h, and then centrifuge to obtain a sulfur-carbon cathode with cobalt nitrate adsorbed, hereinafter referred to as cathode material 1 .

[0030] The activated carbon-sulfur cathode material is obtained by mixing commercial activated carbon and sublimed sulfur at a ratio of 30:70, and then treating it at 155°C for 12h in an argon atmosphere.

Embodiment 2

[0032]Take 15g of the S-C positive electrode with core-shell structure and disperse it in the nickel nitrate hexahydrate solution with a concentration of 3g / L, ultrasonically disperse for 40min, and centrifuge after immersing in magnetic stirring for 16h to obtain a sulfur-carbon positive electrode with nickel nitrate adsorbed on the carbon layer of the outer shell. Called positive electrode material 2.

[0033] The core-shell structured S-C positive electrode is prepared as follows: after mixing hollow carbon spheres and sublimed sulfur at a ratio of 30:70, it is obtained by treating at 155°C for 12h under an argon atmosphere.

[0034] The preparation method of hollow carbon spheres is as follows: SiO 2 The template spheres were uniformly dispersed in a Tris solution with a pH value of 8.5, and after adding dopamine hydrochloride, the magnetic stirring reaction was continued for 12 hours, and the SiO 2 The molar ratio of template to dopamine hydrochloride is 1:1, the mixed d...

Embodiment 3

[0036] Take 15g of S-C positive electrode with core-shell structure and disperse in Tris buffer solution with pH value of 8.5, ultrasonically disperse for 40min, add 1g of dopamine hydrochloride, and react for 22h under magnetic stirring. After centrifuging and washing the reaction solution, the polydopamine-coated core-shell structure S-C positive electrode was dispersed in a copper sulfate solution with a concentration of 3g / L and magnetically stirred for 10h, centrifuged, washed, and dried to obtain polydopamine-Cu 2+ The coated S-C positive electrode with a core-shell structure is referred to as the positive electrode material 3 below.

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Abstract

The invention discloses a positive electrode material of a lithium-sulfur battery. The positive electrode material comprises a sulfur-containing positive electrode material and a transition metal compound. The transition metal compound can generate a transition metal sulfide when the lithium-sulfur battery performs discharging, and the transition metal sulfide is poorly soluble in an electrolyte.According to the positive electrode material, the transition metal compound and the polysulfide ions in a discharge product can form the transition metal sulfide in the lithium-sulfur battery system.The transition metal sulfide is insoluble in an electrolyte so that the transition metal sulfide plays a role in fixing the polysulfide ions of the positive electrode, and shuttling of the polysulfideis blocked fundamentally.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and in particular relates to a positive electrode material of a lithium-sulfur battery, a preparation method thereof and a lithium-sulfur battery containing the positive electrode material. Background technique [0002] The theoretical capacity and specific energy of lithium-sulfur batteries reach 1675mAh / g and 2600Wh / kg, which are much higher than the energy density (<300wAh / kg) of iron-lithium or ternary batteries widely used in commerce, and elemental sulfur is abundant in the earth , has the characteristics of low price and environmental friendliness. Therefore, lithium-sulfur batteries are widely considered to be the development direction of next-generation high-energy-density batteries, and they are also a research hotspot for high-energy-density batteries. [0003] However, elemental sulfur reacts with lithium ions during the electrochemical reaction to form lithium polysulfide (L...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/04H01M10/052
CPCH01M4/38H01M4/628H01M4/04H01M10/052Y02E60/10
Inventor 闫银贤彭祖铃王淑慧刘可禄牛从酥
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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