A high-performance lithium-sulfur battery cathode material and a preparation method thereof

A lithium-sulfur battery and cathode material technology, which is applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc. Effects of redox processes, improved conductivity and reaction kinetics, high yield and industrial viability

Inactive Publication Date: 2019-01-25
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although lithium-sulfur batteries have obvious advantages in secondary batteries, there are still some key problems in the practical application of lithium-sulfur batteries: 1) The conductivity of sulfur itself is extremely poor, and its conductivity at 25°C is only 5×10 -30 S cm -1， It is a typical electronic and ion insulator, and the discharge product lithium sulfide is also an insulator, and lithium sulfide cannot be completely reversibly converted into sulfur, and it is easy to lose electrochemical activity.
2) Polysulfide, an intermediate product generated by elemental sulfur during charge and discharge, is easily dissolved in the electrolyte currently used, resulting in the loss of some electrode active materials; at the same time, the large amount of polysulfide dissolved will also cause electrolyte viscosity. increase, the migration resistance of lithium ions in the electrolyte increases, and the ionic conductivity of the electrolyte deteriorates, which affects the electrode kinetics of the sulfur electrode
Repeated changes in the volume of the positive and negative electrode materials will destroy the physical structure of the electrode to a certain extent, produce micro-cracks, and eventually may cause powdering to cause electrode failure

Method used

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  • A high-performance lithium-sulfur battery cathode material and a preparation method thereof
  • A high-performance lithium-sulfur battery cathode material and a preparation method thereof
  • A high-performance lithium-sulfur battery cathode material and a preparation method thereof

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Embodiment 1

[0026] The high-performance lithium-sulfur battery cathode material is a porous flower-like CoP / C@S composite material.

[0027] The preparation method of the high-performance lithium-sulfur battery cathode material comprises the following steps:

[0028] (1) Preparation of flower-like cobalt chloride bismethanol nanosheet precursor:

[0029] 0.5~1gCoCl 2 ·6H 2 O was dissolved in a mixture of 30mL methanol and 10mL N,N-dimethylformamide to form a transparent solution; then, under continuous stirring, 5mmoL urea was added to the transparent solution to form a homogeneous system; then the obtained homogeneous system was transferred Put it into a 50mL polytetrafluoroethylene-lined stainless steel autoclave, seal it and keep it heated at 150°C for 12h, then cool to room temperature; after centrifugal precipitation, wash the powdery precipitate with distilled water and ethanol; finally wash the powdery precipitate Dry in an oven at 60°C for 6 hours;

[0030] (2) Preparation of ...

Embodiment 2

[0038] The preparation method of the high-performance lithium-sulfur battery cathode material comprises the following steps:

[0039] (1) Preparation of flower-like cobalt chloride bismethanol nanosheet precursor:

[0040] 1gCoCl 2 ·6H 2 O was dissolved in a mixture of 30mL methanol and 10mL N,N-dimethylformamide to form a transparent solution; then, under continuous stirring, 10mmoL urea was added to the transparent solution to form a homogeneous system; then the obtained homogeneous system was transferred Put it into a 50mL polytetrafluoroethylene-lined stainless steel autoclave, seal it and keep it heated at 150°C for 12h, then cool to room temperature; after centrifugal precipitation, wash the powdery precipitate with distilled water and ethanol; finally wash the powdery precipitate Dry in an oven at 60°C for 6 hours;

[0041] (2) Preparation of porous flower-like CoP / C nanosheets:

[0042] Put 0.15g of the precursor obtained in step (1) and 3.0g of sodium hypophosphit...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, in particular to a high-performance lithium-sulfur battery cathode material and a preparation method thereof. The material isporous flower-shaped CoP/C @ S composite. Using cobalt chloride dimethanol as precursor, Porous flower-like CoP/C @ S composites were synthesized by low temperature phosphating process, the porous structure of the composite can effectively coat sulfur, The porosity and nanometer size of CoP/C @ S composites endow them with superionic conductivity and larger electrode/electrolyte interface, which improves the conductivity and promotes the transport of electrons and ions. The results show that CoP/C @ S composites possess the characteristics of high porosity and nanometer size, which can inhibitthe dissolution of polysulfides and improve the utilization of active substances.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a high-performance lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Hybrid electric vehicles and pure electric vehicles are popular due to their environmental protection and pollution-free. Mobile electronics and digital devices have also become popular. Coupled with the rapid development of power grid systems and space technology, people's demand for new high-performance secondary batteries is increasingly urgent. However, none of the widely used cathode materials for lithium-ion batteries can meet the requirements of high specific capacity and high specific energy. This is because the theoretical specific capacity itself is low, and the possibility of further improving its comprehensive electrochemical performance is limited. Therefore, research and The development of new high-specific capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/583H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/5805H01M4/583H01M10/052H01M2004/021Y02E60/10
Inventor 王新崔国梁
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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