Preparation method of lithium sulfur secondary battery cathode material

A lithium-sulfur secondary battery and cathode material technology, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of poor conductivity of elemental sulfur, easy loss of active materials, and difficulty in controlling the particle size of elemental sulfur particles. The effect of loss, improving electron mobility, and improving electrochemical cycle performance

Active Publication Date: 2015-10-21
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN103840143A prepares elemental sulfur through chemical reaction, and then combines with mesoporous TiO 2 S / TiO obtained by heat treatment 2 Composite materials, in which the particle size of elemental sulfur particles obtained by chemical reaction is difficult to control
In summary, the existing technology cannot effectively solve the technical problems of poor conductivity of elemental sulfur or sublimed sulfur and easy loss of active materials during charge and discharge cycles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method for a lithium-sulfur secondary battery cathode material, comprising the following steps:

[0026] 1) In an argon atmosphere, add elemental sulfur and porous activated carbon to a ball mill at a weight ratio of 2:1 and diethyl ether for rough grinding for 2 hours to obtain precursor slurry I. The amount of diethyl ether added during rough grinding requires that the slurry The solid content in it is 20wt.%;

[0027] 2) Dry the precursor slurry I at 80°C, and then add ether and PVDF into a sand mill for fine grinding for 5 hours to obtain precursor slurry II; wherein, the amount of ether added during fine grinding It is required that the solid content in the slurry is 30wt.%, and the addition of PVDF is 3% of the dry precursor slurry I and ether mass sum;

[0028] 3) Use a centrifugal atomizing disc spray dryer to dry the precursor slurry II; the conditions are: an inert atmosphere Ar is introduced, the inlet temperature is adjusted to 250°C, and the ...

Embodiment 2

[0031] A preparation method for a lithium-sulfur secondary battery cathode material, comprising the following steps:

[0032] 1) In an argon atmosphere, add elemental sulfur and single-walled carbon nanotubes to a ball mill with acetone at a weight ratio of 3:1 for rough grinding for 3 hours to obtain precursor slurry I. The amount of acetone added during rough grinding is required Make the solid content in the slurry be 30wt.%;

[0033] 2) Dry the precursor slurry I at 90°C, and then add acetone and PTFE into a sand mill for fine grinding for 7 hours to obtain the precursor slurry II; wherein, the amount of acetone added during fine grinding It is required that the solid content in the slurry is 40wt.%, and the addition of PTFE is 2% of the precursor slurry I and acetone quality sum of drying;

[0034] 3) Use a centrifugal atomizing disc spray dryer to dry the precursor slurry II; the conditions are: an inert atmosphere Ar is introduced, the inlet temperature is adjusted to ...

Embodiment 3

[0037] A preparation method for a lithium-sulfur secondary battery cathode material, comprising the following steps:

[0038] 1) In a nitrogen atmosphere, elemental sulfur and porous SnO 2 Be 5:1 with acetone and add in the ball mill and grind roughly 5 hours together, obtain precursor slurry I, the addition requirement of acetone makes the solid content in the slurry be 50wt.% during rough grinding;

[0039] 2) Dry the precursor slurry I at 90°C, and then add it to a sand mill together with acetone and PVDF for fine grinding for 10 hours to obtain the precursor slurry II; wherein, the amount of acetone added during fine grinding It is required that the solid content in the slurry is 60wt.%, and the addition of PVDF is 1% of the dry precursor slurry I and acetone mass sum;

[0040] 3) Dry the precursor slurry II with an ultra-fine atomizing nozzle spray dryer; the conditions are: feed inert atmosphere nitrogen, adjust the inlet temperature to 330°C, and the outlet temperature...

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Abstract

The invention discloses a preparation method of a lithium sulfur secondary battery cathode material. The method includes the steps of: 1) in an inert atmosphere, adding elemental sulfur, a coating material and a solvent I into a ball mill together to conduct coarse grinding to obtain a precursor slurry I; 2) drying the precursor slurry I, then adding the dried precursor slurry I, a solvent II and an adhesive into a sand mill to perform fine grinding, thus obtaining a precursor slurry II; 3) drying the precursor slurry II with a spray dryer to obtain coated precursor powder; and 4) heating the coated precursor powder in the inert atmosphere till carbonization of the adhesive, thus obtaining the lithium sulfur secondary battery cathode material. The product prepared by the method has uniform particle size and two coating layers, can improve the electron conduction between particles, and also can inhibit the loss of sulfur active substances in a circulation process.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion secondary battery electrode materials, in particular to a preparation method of a lithium-sulfur secondary battery positive electrode material. Background technique [0002] Spray drying technology originated from people trying to control the shape and particle size distribution of particles, and has been widely used in the fields of pharmaceuticals, catalysis, coatings, sensors, photoelectric materials and the preparation of positive and negative materials for lithium-ion secondary batteries. In the field of preparation of positive and negative materials for lithium-ion secondary batteries, spray drying technology has achieved industrial-scale preparation of lithium iron phosphate and lithium titanate; and for ternary materials, lithium manganate, high-nickel materials, graphite negative materials and silicon The laboratory-scale preparation of base and negative electrode materials has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/36
CPCH01M4/366H01M10/0525Y02E60/10
Inventor 徐宁靳佳吴孟涛杨晓亮
Owner TIANJIN B&M SCI & TECH
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