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Positive electrode material and preparation method and use thereof

A positive electrode material and gas technology, applied in the field of positive electrode material and its preparation, can solve the problems of easy water absorption and high alkalinity, and achieve the effects of uniform distribution, improved coating uniformity, and improved ionic conductivity and rate performance.

Active Publication Date: 2019-04-16
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a positive electrode material and its preparation method and application, the positive electrode material is a ternary positive electrode material co-modified with titanium dioxide and lithium fluoride, the total mass of titanium dioxide and lithium fluoride in the positive electrode material is 100% The content is 0.17-3.4%, which solves the problem that the surface of the ternary positive electrode material is easy to absorb water to form lithium hydroxide and lithium carbonate, resulting in too high alkalinity through the modification of the ternary positive electrode material by titanium dioxide and lithium fluoride, making it The safety performance and cycle performance are significantly improved, the rate performance 10C / 1C ratio is 0.85-0.91, the specific capacity is 174-184mAh / g under the charge-discharge condition with a current density of 0.2C, and the capacity retention rate after 50 cycles is ≥97.8 %

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Preparation method of cathode material:

[0058] (1) Use dry argon gas with a temperature of 270°C to clean the high-temperature generator, fluidized bed reaction device, cyclone separator and cooling recovery device;

[0059] (2) TiF 4 Put it into a high-temperature generator, heat and volatilize at 320°C to obtain TiF 4 gas;

[0060] (3) The TiF obtained in step (2) is decomposed by dry nitrogen at a temperature of 284° C. 4 The gas is fed into the gas distributor and then into the fluidized bed reactor, TiF 4 LiNi in Gas and Fluidized Bed Reactor 0.7 co 0.15 mn 0.15 o 2 The reaction generates the positive electrode material, the pressure of the dry nitrogen is 0.5MPa, the flow rate of the dry nitrogen is 60m / s, and the TiF 4 Gas and LiNi 0.7 co 0.15 mn 0.15 o 2 The average reaction residence time in the fluidized bed reactor is 4s;

[0061] (4) sending the gas-solid phase mixture containing the reaction product obtained in step (3) into a cyclone separat...

Embodiment 2

[0065] Preparation method of cathode material:

[0066] (1) Use dry oxygen at a temperature of 330°C to clean the high-temperature generator, fluidized bed reaction device, cyclone separator and cooling recovery device;

[0067] (2) TiF 4 Put it into a high-temperature generator, heat and volatilize at 290°C to obtain TiF 4 gas;

[0068] (3) The TiF obtained in step (2) is decomposed by dry nitrogen at a temperature of 290° C. 4 The gas is fed into the gas distributor and then into the fluidized bed reactor, TiF 4 LiNi in Gas and Fluidized Bed Reactor 0.7 co 0.15 mn 0.15 o 2 The reaction generates the positive electrode material, the pressure of the dry nitrogen is 0.4MPa, the gas flow rate of the dry nitrogen is 70m / s, and the TiF 4 Gas and LiNi 0.7 co 0.15 mn 0.15 o 2 The reaction residence time in the fluidized bed reactor is 2s;

[0069] (4) sending the gas-solid phase mixture containing the reaction product obtained in step (3) into a cyclone separator for ga...

Embodiment 3

[0073] Preparation method of cathode material:

[0074] (1) Use dry nitrogen with a temperature of 120°C to clean the high-temperature generator, fluidized bed reaction device, cyclone separator and cooling recovery device;

[0075] (2) TiF 4 Put it into a high-temperature generator, heat and volatilize at 310°C to obtain TiF 4 gas;

[0076] (3) The TiF obtained in step (2) is decomposed by dry nitrogen at a temperature of 295° C. 4 The gas is fed into the gas distributor and then into the fluidized bed reactor, TiF 4 LiNi in Gas and Fluidized Bed Reactor 0.7 co 0.15 mn 0.15 o 2 The reaction generates the positive electrode material, the pressure of the dry nitrogen is 0.6MPa, the gas flow rate of the dry nitrogen is 40m / s, and the TiF 4 Gas and LiNi 0.7 co 0.15 mn 0.15 o 2 The reaction residence time in the fluidized bed reactor is 5s;

[0077] (4) sending the gas-solid phase mixture containing the reaction product obtained in step (3) into a cyclone separator fo...

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Abstract

The invention relates to a positive electrode material and a preparation method and use thereof. The positive electrode material is a ternary positive electrode material jointly modified by titanium dioxide and lithium fluoride. The total mass percentage of the titanium dioxide and the lithium fluoride in the positive electrode material is 0.17 to 3.4%. The modification of the ternary positive electrode material by the titanium dioxide and the lithium fluoride solves the problem that the surface of the ternary positive electrode material is likely to absorb water to form lithium hydroxide andlithium carbonate and thus cause excessive alkalinity. The ternary positive electrode material is obviously improved in safety performance and cycle performance, has a rate capability 10C / 1C ratio of0.85 to 0.91, a specific capacity of 174 to 184mAh / g under a charge-discharge condition of 0.2C current density, and a capacity retention rate greater than or equal to 97.8% after 50 cycles.

Description

technical field [0001] The invention relates to battery positive electrode materials, in particular to a positive electrode material and its preparation method and application. Background technique [0002] Affected by policies, the power lithium battery cathode material industry has developed rapidly. Electric vehicles require batteries to have characteristics such as high specific energy, high specific power, low self-discharge, long service life, low price and good safety. [0003] Ternary materials can meet the requirements of high specific energy, high specific power, and low price, but the main problem at present is that the surface alkali content is too high, and the surface of the material is easy to deoxidize, resulting in capacity loss. The general means of improving ternary materials include coating, doping and surface modification, such as oxide coating, carbon material coating, fluorine doping, organic coating, lithium-containing coating, etc. [0004] CN108682...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/582H01M10/052Y02E60/10
Inventor 谭强强王鹏飞
Owner LANGFANG GREEN IND TECH CENT
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