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High-voltage lithium nickel-cobalt manganate cathode material and preparation method thereof

A technology of nickel cobalt lithium manganate and cathode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of rapid cycle decay, particle pulverization, poor stability, etc., to improve compaction density, realize industrialized production, The effect of improving cycle life

Active Publication Date: 2019-05-21
HEFEI RONGJIE ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-voltage nickel-cobalt lithium manganese oxide positive electrode material and its preparation method to solve the problems of poor stability, fast cycle attenuation and particle pulverization of the nickel-cobalt lithium manganese oxide positive electrode material in the prior art under high voltage. question

Method used

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  • High-voltage lithium nickel-cobalt manganate cathode material and preparation method thereof
  • High-voltage lithium nickel-cobalt manganate cathode material and preparation method thereof
  • High-voltage lithium nickel-cobalt manganate cathode material and preparation method thereof

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Effect test

Embodiment 1

[0031] A method for preparing a high-voltage nickel-cobalt lithium manganese oxide positive electrode material comprises the following steps.

[0032] Step (1): Weigh Ni by molar ratio 1:0.0004:0.0025:0.53 0.5 co 0.2 mn 0.3 (OH) 2 , La 2 o 3 , LiF and Li 2 CO 3 Place in a ball mill, and ball mill for 3 hours at a speed of 300r / min to obtain the mixed material A;

[0033] Step (2): Put the mixed material A obtained in step (1) in a muffle furnace to raise the temperature to 940°C at a heating rate of 5°C / min, calcinate in an air atmosphere for 10h, then cool naturally to room temperature, grind, crush and sieve , the nickel-cobalt-lithium-manganese-oxide dopant is prepared, and the chemical formula of the nickel-cobalt-lithium-manganate dopant is LiNi 0.5 co 0.1992 mn 0.3 La 0.0008 o 1.995 f 0.0025 ;

[0034] Step (3): Mix aluminum phosphate, diammonium hydrogen phosphate solution, and nickel-cobalt lithium manganate dopant in a mass ratio of 1:0.003:0.015, then b...

Embodiment 2

[0054] A method for preparing a high-voltage nickel-cobalt lithium manganese oxide positive electrode material comprises the following steps.

[0055] Step (1): Weigh Ni by molar ratio 1:0.001:0.0025:0.55 0.5 co 0.2 mn 0.3 (OH) 2 , La 2 o 3 , LiF and Li 2 CO 3 Place in a ball mill, and ball mill for 3 hours at a speed of 300r / min to obtain the mixed material A;

[0056] Step (2): Put the mixed material A obtained in step (1) in a muffle furnace to raise the temperature to 940°C at a heating rate of 5°C / min, calcinate in an air atmosphere for 12h, then cool naturally to room temperature, grind, crush and sieve , to prepare nickel-cobalt-lithium-manganese-oxide dopant; the chemical formula of the nickel-cobalt-lithium-manganate dopant is LiNi 0.5 co 0.198 mn 0.3 La 0.002 o 1.995 f 0.0025 ;

[0057] Step (3): Mix aluminum phosphate, diammonium hydrogen phosphate aqueous solution, and nickel-cobalt lithium manganese oxide dopant in a mass ratio of 1:0.001:0.006 and t...

Embodiment 3

[0061] A method for preparing a high-voltage nickel-cobalt lithium manganese oxide positive electrode material comprises the following steps.

[0062] Step (1): Weigh Ni by molar ratio 1:0.001:0.0025:1.12 0.5 co 0.2 mn 0.3 CO 3 , La 2 o 3 , LiF, LiOH·H 2 O is placed in a ball mill, and ball milled for 3 hours at a speed of 300r / min to obtain a mixture A;

[0063] Step (2): The mixed material A obtained in step (1) is placed in a muffle furnace to raise the temperature to 980°C at a heating rate of 5°C / min, calcined in an air atmosphere for 15h, and then naturally cooled to room temperature, ground and crushed. Sieve to prepare nickel-cobalt lithium manganate dopant material; gained nickel-cobalt lithium manganate dopant chemical formula is LiNi 0.5 co 0.198 mn 0.3 La 0.002 o 1.995 f 0.0025 ;

[0064] Step (3): Mix aluminum phosphate, diammonium hydrogen phosphate aqueous solution, and nickel-cobalt lithium manganese oxide dopant in a mass ratio of 1:0.001:0.006 an...

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Abstract

The invention discloses a high-voltage lithium nickel-cobalt manganate cathode material and a preparation method thereof. The lithium nickel-cobalt manganate cathode material is lithium nickel-cobaltmanganate doping material coated with the phosphate, the lithium nickel-cobalt manganate doping material means that the lithium nickel-cobalt manganate doping material is doped with a lanthanum element and a fluorine element; the phosphate is prepared by mixing the aluminum phosphate and diammonium phosphate aqueous solution. The doping of the lanthanum element and the fluorine element can increase the interplanar spacing so as to promote the lithium ion migration and improving the structure stability; the material surface has good lithium ion conductivity feature and a certain electronic conductivity feature by coating the phosphate on the surface, so that the material has higher lithium-removing state stability under high voltage; the residual lithium quantity of the material surface isreduced, the surface side reaction is inhibited, and the structure stability and the cycle performance of the material under high voltage are obviously improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-voltage nickel-cobalt lithium manganese oxide positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery, as a green secondary storage energy, has the advantages of portability, mobility, high energy, and environmental protection. The demand for lithium batteries in electric vehicles has increased, and higher requirements have been placed on the comprehensive performance of batteries such as energy density, cycle times, and safety performance. [0003] In lithium-ion batteries, the cathode material is one of the most critical components, and its performance determines the performance of lithium-ion batteries to a large extent. At present, as the market has higher and higher requirements for high energy density battery systems, the specific capacity of cathode materials has become one of the main limiting factors res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCY02E60/10
Inventor 徐从胜王广进胡刚刚倪国华朱二涛戴首吴金林
Owner HEFEI RONGJIE ENERGY MATERIALS CO LTD
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