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Lithium-rich manganese-based positive electrode material and its preparation with aluminum doping on the surface and lithium titanium aluminum phosphate coating

A lithium aluminum titanium phosphate, lithium-rich manganese-based technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of complex operation, difficult industrial production, increased impedance, etc., to achieve low preparation cost, inhibit phase transition, The effect of simple modification methods

Active Publication Date: 2022-06-24
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 and its preparation with aluminum doping on the surface and lithium titanium aluminum phosphate coating
  • Lithium-rich manganese-based positive electrode material and its preparation with aluminum doping on the surface and lithium titanium aluminum phosphate coating
  • Lithium-rich manganese-based positive electrode material and its preparation with aluminum doping on the surface and lithium titanium aluminum phosphate coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, two-step method to synthesize surface-coated Li 1.3 Al0.3 Ti 1.7 (PO 4 ) 3 and surface doping 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 then added 0.5g of bulk Li 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 350 r / min, evaporate the above solution to dryness, and then dry it in an oven at 80 °C for 12 h to obtain Al(NO 3 ) 3 ·9H 2 O-coated Li 1.2 Ni 0.2 Mn 0.6 O 2 ;

[0038] 2. Put the dried powder in a muffle furnace, and heat it to 600°C at a heating rate of 5°C / min for 5 hours to obtain Li doped with Al on the surface. 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, and after thorough mixing, add dr...

Embodiment 2

[0047] One-step synthesis of surface-coated Li in this example 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 and surface doping 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 then added 0.5g of bulk Li 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 350 r / min, evaporate the above solution to dryness, and then dry it in an oven at 80 °C for 2 h 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 anhydrous ethanol to the dried powder, stir for half an hour, and then add dropwise anhydrous ethanol in which 0.01g of tetrabutyl titanate is dissolved (tetrabutyl titanate is completely dissolved in anhydrous ethanol) , and then stir for half an hour;

[0050] 3. Add 0.0009g LiOH·H 2 O a...

Embodiment 3

[0057] One-step synthesis of surface-coated Li in this example 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 and surface doping 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 then added 0.5g of bulk Li 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 350 r / min, evaporate the above solution to dryness, and then dry it in an oven at 80 °C for 2 h 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 anhydrous ethanol to the dried powder, stir for half an hour, and after thorough mixing, add dropwise anhydrous ethanol in which 0.01g of tetrabutyl titanate is dissolved, and then stir for half an hour;

[0060] 3. Add 0.0009g LiOH·H 2 O and 0.0053gNH 4 H 2 PO 4 Dissolve it with 5ml of et...

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Abstract

The invention provides a lithium-rich manganese-based positive electrode material doped with aluminum on the surface and coated with lithium titanium aluminum phosphate and its preparation, belonging to the technical field of energy storage materials and electrochemistry. It includes a lithium-rich manganese-based positive electrode material and a coating layer lithium titanium aluminum phosphate wrapped outside the lithium-rich manganese-based positive electrode material, the surface of the lithium-rich manganese-based positive electrode material is doped with Al; the chemical formula of the lithium-rich manganese-based positive electrode material is for xLi 2 MnO 3 ·(1-x)LiMO 2 , M is at least one of transition metals Ni and Mn, 0<x<1. The invention also provides a preparation method of the lithium-rich manganese-based positive electrode material whose surface is doped with aluminum and coated with lithium titanium aluminum phosphate. The positive electrode material of the present invention prevents the direct contact between the electrolyte and the positive electrode material through the coating layer, and at the same time, the fast ion conductor is beneficial to Li + The transmission improves the rate performance; the cladding layer is formed and the surface is doped with Al in one step to stabilize the lattice oxygen, which improves the cycle performance of the material.

Description

technical field [0001] The invention belongs to the technical fields of energy storage materials and electrochemistry, in particular to a lithium-rich manganese-based positive electrode material with surface aluminum doping and titanium aluminum lithium phosphate coating and preparation thereof. Background technique [0002] With the increasing use of electronic products and electric vehicles, the application of high energy density batteries has received extensive attention. Among the cathode materials for lithium-ion batteries, lithium cobalt oxide, lithium manganate, and lithium iron phosphate have all been commercialized with their respective advantages, but their common disadvantage of low specific capacity limits their further development. [0003] Li-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, when the cut-off voltage i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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