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Lithium-rich manganese-based positive electrode material with aluminum-doped surface and titanium-aluminum-lithium phosphate-coated surface and preparation thereof

A lithium aluminum titanium phosphate and lithium-rich manganese-based technology, which is applied in the fields of energy storage materials and electrochemistry, can solve the problems of complicated operation, increased impedance, difficult industrialized production, etc., and achieves low preparation cost, inhibited phase transition, and easy industrialized production. Effect

Active Publication Date: 2020-11-24
北京理工大学重庆创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional coating method is mainly to improve the cycle performance of the material by inhibiting the direct contact between the electrolyte and the positive electrode material, but at the same time it will also increase the impedance and generate redundant energy consumption; at the same time, the traditional bulk doping experiment is complicated and difficult to perform. Industrial production

Method used

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  • Lithium-rich manganese-based positive electrode material with aluminum-doped surface and titanium-aluminum-lithium phosphate-coated surface and preparation thereof
  • Lithium-rich manganese-based positive electrode material with aluminum-doped surface and titanium-aluminum-lithium phosphate-coated surface and preparation thereof
  • Lithium-rich manganese-based positive electrode material with aluminum-doped surface and titanium-aluminum-lithium phosphate-coated surface and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The two-step method of this embodiment synthesizes surface-coated Li 1.3 Al0.3 Ti 1.7 (PO 4 ) 3 and surface-doped modified Al Li 1.2 Ni 0.2 mn 0.6 o 2 , the specific preparation process is as follows:

[0037] 1. Add 0.0701gAl(NO 3 ) 3 9H 2 O was dissolved in 15ml of absolute ethanol, stirred until dissolved and 0.5g of bulk Li was added 1.2 Ni 0.2 mn 0.6 o 2 , ultrasonicated for half an hour, then placed on a magnetic stirrer, set the heating temperature to 70°C, and the stirring rate to 350r / min, evaporated the above solution to dryness, and then dried it in an oven at 80°C for 12h to obtain Al(NO 3 ) 3 9H 2 O-coated Li 1.2 Ni 0.2 mn 0.6 o 2 ;

[0038] 2. Place the dried powder in a muffle furnace, heat it to 600°C at a heating rate of 5°C / min and keep it for 5 hours to obtain a Li surface doped with Al. 1.2 Ni 0.2 mn 0.6 o 2 ;

[0039] 3. Add 15ml of absolute ethanol to the calcined powder, stir for half an hour, mix well, add dropwise absolu...

Embodiment 2

[0047] This embodiment synthesizes surface-coated Li by one-step method 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 and surface-doped modified Al Li 1.2 Ni 0.2 mn 0.6 o 2 , the specific preparation process is as follows:

[0048] 1. Add 0.0701gAl(NO 3 ) 3 9H 2 O was dissolved in 15ml of absolute ethanol, stirred until dissolved and 0.5g of bulk Li was added 1.2 Ni 0.2 mn 0.6 o 2 , ultrasonicated for half an hour, then placed on a magnetic stirrer, set the heating temperature to 70°C, and the stirring rate to 350r / min, evaporated the above solution to dryness, and then dried it in an oven at 80°C for 2h to obtain Al(NO 3 ) 3 9H 2 O-coated Li 1.2 Ni 0.2 mn 0.6 o 2 ;

[0049] 2. Add 15ml of absolute ethanol to the dried powder, stir for half an hour, mix thoroughly and add dropwise absolute ethanol in which 0.01g of tetrabutyl titanate is dissolved (tetrabutyl titanate is completely dissolved in absolute ethanol) , and then stirred for half an hour;

[0050] 3. Add 0.0009g...

Embodiment 3

[0057] This embodiment synthesizes surface-coated Li by one-step method 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 and surface layer doped modified Al Li 1.2 Ni 0.2 mn 0.6 o 2 , the specific preparation process is as follows:

[0058] 1. Add 0.0701gAl(NO 3 ) 3 9H 2 O was dissolved in 15ml of absolute ethanol, stirred until dissolved and 0.5g of bulk Li was added 1.2 Ni 0.2 mn0.6 o 2 , ultrasonicated for half an hour, then placed on a magnetic stirrer, set the heating temperature to 70°C, and the stirring rate to 350r / min, evaporated the above solution to dryness, and then dried it in an oven at 80°C for 2h to obtain Al(NO 3 ) 3 9H 2 O-coated Li 1.2 Ni 0.2 mn 0.6 o 2 ;

[0059] 2. Add 15ml of absolute ethanol to the dried powder, stir for half an hour, mix well, add dropwise absolute ethanol dissolved in 0.01g of tetrabutyl titanate, and then stir for half an hour;

[0060] 3. Add 0.0009gLiOH·H 2 O and 0.0053gNH 4 h 2 PO 4 Dissolve it with 5ml of ethanol and add it to...

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Abstract

The invention provides a lithium-rich manganese-based positive electrode material with an aluminum-doped surface and a titanium-aluminum-lithium phosphate-coated surface and preparation thereof, and belongs to the technical field of energy storage materials and electrochemistry. The lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrodematerial and a coating layer lithium titanium aluminum phosphate coating the lithium-rich manganese-based positive electrode material, and Al is doped on the surface of the lithium-rich manganese-based positive electrode material; the chemical formula of the lithium-rich manganese-based positive electrode material is xLi2MnO3.(1-x)LiMO2, M is at least one of transition metals Ni and Mn, and x ismore than 0 and less than 1. The invention further provides the preparation method of the lithium-rich manganese-based positive electrode material with the aluminum-doped surface and the titanium-aluminum-lithium phosphate-coated surface. According to the positive electrode material, direct contact between an electrolyte solution and the positive electrode material is prevented through the coatinglayer, and meanwhile, a fast ion conductor is beneficial to Li<+> transmission to improve the rate capability; the coating layer is formed through a one-step method, Al is doped on the surface, the effect of stabilizing lattice oxygen is achieved, and the cycle performance of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials and electrochemistry, and specifically relates to a lithium-rich manganese-based positive electrode material with aluminum doping on the surface and lithium titanium aluminum phosphate coating and its preparation. Background technique [0002] With the increasing use of electronic products and electric vehicles, the application of high energy density batteries has received much attention. Among the cathode materials for lithium-ion batteries, lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate have all been commercially applied due to their respective advantages, but their common disadvantage of low specific capacity limits their further development. [0003] Lithium-rich manganese-based cathode materials are considered to be the most promising cathode materials for next-generation lithium-ion batteries due to their high energy density and low cost. However,...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/58H01M10/0525
CPCH01M4/366H01M4/485H01M4/5825H01M4/505H01M10/0525Y02E60/10
Inventor 苏岳锋赵佳雨陈来包丽颖卢赟董锦洋陈实吴锋
Owner 北京理工大学重庆创新中心
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