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Lithium-rich manganese-based layered material with sulfur-doped surface and lithium sulfate protective layer

A technology rich in lithium manganese and lithium sulfate, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of capacity and stability to be further improved, high concentration of sulfur vapor, complex process operation, etc., to improve the rate performance and Discharge capacity, increased ion transport, and the effects of alleviating side reactions

Pending Publication Date: 2022-06-07
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration of sulfur vapor is high, the process operation is too complicated, and the requirements for equipment are high; the capacity and stability of the final material still need to be further improved

Method used

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  • Lithium-rich manganese-based layered material with sulfur-doped surface and lithium sulfate protective layer
  • Lithium-rich manganese-based layered material with sulfur-doped surface and lithium sulfate protective layer
  • Lithium-rich manganese-based layered material with sulfur-doped surface and lithium sulfate protective layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Grind the elemental sulfur powder in anhydrous ethanol and disperse it uniformly, and then add the lithium-rich manganese-based layered material Li 1.2 Mn 0.6 Ni 0.2 O 2 , after ultrasonically dispersing uniformly, heating to 70 °C with stirring to evaporate to dryness, and vacuum drying at 80 °C for 12 h to obtain an intermediate product; wherein, the molar ratio of elemental sulfur powder to lithium-rich manganese-based cathode material is 0.03:1;

[0039] (2) Under the oxygen atmosphere in the tube furnace, the oxygen flow rate is 80mL / min, and the intermediate product is calcined at 270°C for 8h, and the heating rate is 10°C / min to obtain a surface sulfur-doped and protected by lithium sulfate layer of Li-rich manganese-based layered material.

[0040] The XRD test results of the material are as follows figure 1 As shown, the characteristic peak positions of the material are similar to those of LiNiO 2 and Li 2 MnO 3 The characteristic peaks are consisten...

Embodiment 2

[0046] (1) Grind the elemental sulfur powder in anhydrous ethanol and disperse it uniformly, and then add the lithium-rich manganese-based layered material Li 1.2 Mn 0.6 Ni0.2 O 2 , after ultrasonically dispersing uniformly, heating to 70 °C with stirring to evaporate to dryness, and vacuum drying at 80 °C for 12 h to obtain an intermediate product; wherein, the molar ratio of elemental sulfur powder to lithium-rich manganese-based cathode material is 0.03:1;

[0047] (2) Under the oxygen atmosphere in the tube furnace, the oxygen flow rate is 100mL / min, and the intermediate product is calcined at 270°C for 6h, and the heating rate is 7°C / min to obtain a surface doped with sulfur and protected by lithium sulfate. layer of Li-rich manganese-based layered material.

[0048] The XRD test results of the material are as follows figure 1 As shown, the characteristic peak positions of the material are similar to those of LiNiO 2 and Li 2 MnO 3 The characteristic peaks are consi...

Embodiment 3

[0055] (1) Grind the elemental sulfur powder in anhydrous ethanol and disperse it uniformly, and then add the lithium-rich manganese-based layered material Li 1.2 Mn 0.6 Ni 0.2 O 2 , after ultrasonically dispersing uniformly, heating to 70 °C with stirring to evaporate to dryness, and vacuum drying at 80 °C for 12 h to obtain an intermediate product; wherein, the molar ratio of elemental sulfur powder to lithium-rich manganese-based cathode material is 0.03:1;

[0056] (2) Under the oxygen atmosphere in the tube furnace, the oxygen flow rate is 80mL / min, and the intermediate product is calcined at 270°C for 8h, and the heating rate is 10°C / min to obtain a surface sulfur-doped and protected by lithium sulfate layer of Li-rich manganese-based layered material.

[0057] The XRD test results of the material are as follows figure 1 As shown, the characteristic peak positions of the material are similar to those of LiNiO 2 and Li 2 MnO 3 The characteristic peaks are consisten...

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Abstract

The invention relates to a surface sulfur-doped lithium-rich manganese-based layered material with a lithium sulfate protective layer, and belongs to the technical field of lithium ion batteries. According to the material, a lithium-rich manganese-based layered material serves as a matrix, the surface of the matrix is doped with sulfur and coated with lithium sulfate, elemental sulfur and the lithium-rich manganese-based layered material are mixed and then calcined in the oxygen atmosphere, and by controlling the oxygen flow, the heating rate, the calcination temperature and the calcination time, on one hand, sulfur enters the matrix and is doped on the surface layer of the matrix, and on the other hand, sulfur is doped on the surface layer of the matrix; on the other hand, sulfur reacts with oxygen to generate sulfur dioxide, and the sulfur dioxide reacts with residual alkali on the surface of the lithium-rich manganese-based layered material to generate a lithium sulfate coating layer in situ. The material has good electrochemical performance.

Description

technical field [0001] The invention relates to a lithium-rich manganese-based layered material with surface sulfur doping and a lithium sulfate protective layer, belonging to the technical field of lithium ion batteries. Background technique [0002] In lithium-ion batteries, Li-rich manganese-based layered materials stand out due to their ultra-high discharge specific capacity (>250mAh / g), and have become a research hotspot for cathode materials. However, due to the serious irreversible oxygen release of Li-rich manganese-based layered materials, which will cause structural transformation and discharge platform attenuation, in practical use, the material needs to be modified to reduce oxygen loss and phase transition. [0003] The most commonly used modification method is element doping. S element is a common dopant because of its similar characteristics to O. For example, in the preparation method of a sulfur-anion-doped lithium-rich cathode material disclosed in Chin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/62
CPCH01M4/366H01M4/485H01M4/505H01M4/628Y02E60/10
Inventor 陈来苏岳锋赵佳雨李宁董锦洋郝佳男李文博卢赟曹端云黄擎吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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