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 sa

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
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Effect test

Example Embodiment

[0035] Example 1

[0036] Synthesis Example-step method of the present embodiment the surface-coated Li 1.3 Al0.3 Ti 1.7 (Po 4 ) 3 And LI for surface-doped modified Al 1.2 Ni 0.2 Mn 0.6 O 2 The specific preparation process is as follows:

[0037] 1, 0.0701GAL (NO 3 ) 3 · 9h 2 O Soluble in 15 ml of anhydrous ethanol, stir until 0.5g of body Li 1.2 Ni 0.2 Mn 0.6 O 2 Ultrasound half an hour, then placed on a magnetic stirrer, a heating temperature of 70 ° C, a stirring rate of 350 r / min, dried the solution, then dried in an oven at 80 ° C for 12 h, resulting in Al (NO 3 ) 3 · 9h 2 O Covered LI 1.2 Ni 0.2 Mn 0.6 O 2 ;

[0038] 2. Place the dried powder in the muffle furnace, the temperature increase of 5 ° C / min is heated to 600 ° C for 5 hours to obtain Li of the surface-doped Al 1.2 Ni 0.2 Mn 0.6 O 2 ;

[0039] 3, add 15 ml of anhydrous ethanol, stirred for half an hour, stirred with stirring, and then dripped with anhydrous ethanol having 0.01 g of titanate titanate, and then s...

Example Embodiment

[0046] Example 2

[0047] This example is a step of synthesis of surface coating Li 1.3 Al 0.3 Ti 1.7 (Po 4 ) 3 And LI for surface-doped modified Al 1.2 Ni 0.2 Mn 0.6 O 2 The specific preparation process is as follows:

[0048] 1, 0.0701GAL (NO 3 ) 3 · 9h 2 O Soluble in 15 ml of anhydrous ethanol, stir until 0.5g of body Li 1.2 Ni 0.2 Mn 0.6 O 2 Ultrasound half an hour, then placed on a magnetic stirrer, a heating temperature of 70 ° C, a stirring rate of 350 r / min, and the solution was evaporated, then dried in an oven at 80 ° C for 2 h to give Al (NO 3 ) 3 · 9h 2 O Covered LI 1.2 Ni 0.2 Mn 0.6 O 2 ;

[0049] 2, the dried powder was added 15 ml of anhydrous ethanol, stirred for half an hour, and mixed with 0.01 g of titanate titanium titanate (titanate tetrabutyrate in anhydrous ethanol in anhydrous ethanol) , Then stir for half an hour;

[0050] 3, will 0.0009glioh · h 2 O and 0.0053Gnh 4 Hide 2 PO 4 The mixture was dissolved with 5 ml of ethanol and then added to the mixing l...

Example Embodiment

[0056] Example 3

[0057] This example is a step of synthesis of surface coating Li 1.3 Al 0.3 Ti 1.7 (Po 4 ) 3 And LI of the surface-doped modified Al 1.2 Ni 0.2 Mn 0.6 O 2 The specific preparation process is as follows:

[0058] 1, 0.0701GAL (NO 3 ) 3 · 9h 2 O Soluble in 15 ml of anhydrous ethanol, stir until 0.5g of body Li 1.2 Ni 0.2 Mn0.6 O 2 Ultrasound half an hour, then placed on a magnetic stirrer, a heating temperature of 70 ° C, a stirring rate of 350 r / min, and the solution was evaporated, then dried in an oven at 80 ° C for 2 h to give Al (NO 3 ) 3 · 9h 2 O Covered LI 1.2 Ni 0.2 Mn 0.6 O 2 ;

[0059] 2, the dried powder was added to 15ml of absolute ethanol, stirred for half an hour, a solution of 0.01g of tetrabutyl titanate dissolved in absolute ethanol thoroughly mixed, and then stirred for half an hour;

[0060] 3, will 0.0009glioh · h 2 O and 0.0053Gnh 4 Hide 2 PO 4 Then added with 5ml of ethanol was dissolved mixture in Step 2, followed by stirring IH; then pla...

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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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