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Co-doped modified lithium ion battery ternary positive electrode material and preparation method thereof

A positive electrode material and co-doping technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problem of not being able to completely compensate for the defects of ternary positive electrode materials, and achieve the purpose of reducing the degree of cation mixing, small specific surface area, and improving Effects of Cyclic Stability

Pending Publication Date: 2021-07-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single doping strategy cannot fully compensate for the defects of ternary cathode materials.

Method used

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  • Co-doped modified lithium ion battery ternary positive electrode material and preparation method thereof
  • Co-doped modified lithium ion battery ternary positive electrode material and preparation method thereof
  • Co-doped modified lithium ion battery ternary positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Lithium nitrate, nickel nitrate, cobalt nitrate and manganese nitrate are weighed according to the molar ratio of 1.05:0.5:0.2:0.3, respectively dissolved and mixed, and then weighed citric acid equivalent to the sum of the moles of metal salts , after dissolving, add the above mixed solution;

[0034] (2) Using ammonia water, adjust the pH of the mixed solution to 7.5, place the mixed solution in a water bath at 85°C, stir and evaporate until a purple sol is formed;

[0035] (3) drying the purple sol obtained in step (2) in a blast oven at 100°C for 12 hours to obtain a precursor;

[0036] (4) Transfer the precursor to a muffle furnace, raise the temperature to 500°C at a heating rate of 5°C / min for pre-sintering for 6 hours, cool to room temperature and grind for 1 hour to obtain the precursor;

[0037] (5) Put the precursor in a muffle furnace, raise the temperature to 850°C at a heating rate of 6°C / min, perform high-temperature calcination in an air atmosphere ...

Embodiment 2

[0041] (1) After lithium nitrate, nickel nitrate, cobalt nitrate, manganese nitrate, aluminum nitrate and ammonium fluoride are weighed according to the molar ratio of 1.06:0.49:0.196:0.294:0.01:0.02, dissolve and mix respectively, then weigh and mix with The citric acid equal to the sum of metal salt moles is added to the above-mentioned mixed solution after dissolving;

[0042] (2) Using ammonia water, adjust the pH of the mixed solution to 7.5, place the mixed solution in a water bath at 85°C, stir and evaporate until a purple sol is formed;

[0043] (3) drying the purple sol obtained in step (2) in a blast oven at 100°C for 12 hours to obtain a precursor;

[0044] (4) Transfer the precursor to a muffle furnace, raise the temperature to 500°C at a heating rate of 4°C / min for pre-sintering for 6 hours, cool to room temperature and grind for 1 hour to obtain the precursor;

[0045] (5) Put the precursor in a muffle furnace, raise the temperature to 850°C at a heating rate of...

Embodiment 3

[0049] (1) After lithium nitrate, nickel nitrate, cobalt nitrate, manganese nitrate, aluminum nitrate and lithium fluoride are weighed according to the molar ratio of 1.03:0.48:0.192:0.288:0.02:0.04, dissolve and mix respectively, then weigh and The citric acid equal to the sum of metal salt moles is added to the above-mentioned mixed solution after dissolving;

[0050] (2) Using ammonia water, adjust the pH of the mixed solution to 7.5, place the mixed solution in a water bath at 85°C, stir and evaporate until a purple sol is formed;

[0051] (3) drying the purple sol obtained in step (2) in a blast oven at 100°C for 12 hours to obtain a precursor;

[0052] (4) Transfer the precursor to a muffle furnace, raise the temperature to 500°C at a heating rate of 5°C / min for pre-sintering for 6 hours, cool to room temperature and grind for 1 hour to obtain the precursor;

[0053] (5) Put the precursor in a muffle furnace, raise the temperature to 850°C at a heating rate of 6°C / min, ...

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Abstract

The invention discloses a co-doped modified lithium ion battery ternary positive electrode material and a preparation method thereof, wherein the chemical general formula of the prepared material is Li(Ni0.5Co0.2Mn0.3)1-xAlx / 2Lix / 2O2-xFx, and x is 0-0.06. The preparation method is characterized by comprising the following steps: weighing a lithium salt, a nickel salt, a cobalt salt, a manganese salt, an aluminum salt and a non-metal villiaumite according to a molar ratio, then weighing citric acid, dissolving, adding into a mixed solution, stirring and evaporating to form sol, drying, presintering to obtain a precursor, and finally calcining at a high temperature to obtain the doping material. According to the invention, the preparation method is simple and convenient, and the obtained Al, Li and F co-doped positive electrode material is uniform in particle, moderate in particle size, high in crystallization degree and excellent in cycle performance at high temperature and high voltage, can be practically applied to the field of power batteries and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a co-doped modified lithium-ion battery ternary cathode material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] In recent years, with the rapid update of electronic equipment and the rapid development of the new energy vehicle market, the requirements for the performance of lithium-ion batteries have become higher and higher, and cathode materials have always been the key to restricting the development of lithium-ion batteries. The currently widely used positive electrode materials mainly include lithium cobaltate, lithium manganate, lithium iron phosphate and various ternary materials, among which the nickel-cobalt-manganese system is the majority of the ternary materials. Nickel-cobalt-manganese ternary material (LiNi x co y mn z o 2 ) has high specific capacity, good safety performance and low cost, etc., and is considered to be the most likely t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张海朗王小满
Owner JIANGNAN UNIV
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