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Preparation method for aluminum-fluoride-coated lithium nickel cobalt manganate positive electrode material

A technology of nickel cobalt lithium manganate and cathode material, which is applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of high rate performance, poor cycle stability, poor safety, etc. The effect of short time and low energy consumption

Inactive Publication Date: 2016-09-21
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high rate performance and cycle stability of lithium nickel cobalt manganese oxide are poorer than lithium cobalt oxide with a high market share, and the safety is poorer than lithium iron phosphate

Method used

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  • Preparation method for aluminum-fluoride-coated lithium nickel cobalt manganate positive electrode material
  • Preparation method for aluminum-fluoride-coated lithium nickel cobalt manganate positive electrode material
  • Preparation method for aluminum-fluoride-coated lithium nickel cobalt manganate positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 0.0161g Al(OH) 3 Add to 60ml deionized water to make aluminum hydroxide suspension, then 20.0gLiNi 0.5 co 0.2 mn 0.3 o 2 Disperse in the solution; slowly add 20ml of ammonium bifluoride solution (containing 0.0365g of ammonium bifluoride) dropwise into the solution under constant stirring in a water bath at 85°C, evaporate until the solution is evaporated to dryness, and stand at 70°C for 2 Hours; Finally, put the product in an oven at 100°C for 1 hour; crush the sample through a 400-mesh sieve to obtain a solid powder; put the solid powder into a tube furnace, and raise the temperature to 500°C at a rate of 1°C / min under a nitrogen atmosphere Calcined for 2 hours and cooled naturally to room temperature to obtain aluminum fluoride-coated nickel-cobalt lithium manganese oxide LiNi 0.5 co 0.2 mn 0.3 o 2 . For comparison of the structure before and after coating, see figure 1 ;Comparison of discharge specific capacity cycle stability of 3.0V-4.3V under 1C rate ...

Embodiment 2

[0023] 0.0161g Al(OH) 3 Add to 60ml deionized water to make aluminum hydroxide suspension, then 20.0gLiNi 0.5 co 0.2 mn 0.3 o 2 Disperse in the solution; slowly add 20ml of ammonium bifluoride solution (containing 0.1095g of ammonium bifluoride) dropwise into the solution under constant stirring in a water bath at 90°C, evaporate until the solution is evaporated to dryness, and stand at 70°C for 2 Hours; Finally, put the product in an oven at 100°C for 1 hour; crush the sample through a 400-mesh sieve to obtain a solid powder; put the solid powder into a tube furnace, and raise the temperature to 650°C at a heating rate of 1°C / min under a nitrogen atmosphere Calcined for 1 hour and cooled naturally to room temperature to obtain aluminum fluoride-coated nickel-cobalt lithium manganese oxide LiNi 0.5 co 0.2 mn 0.3 o 2 .

Embodiment 3

[0025] 0.0161g Al(OH) 3 Add to 60ml deionized water to make aluminum hydroxide suspension, then 20.0gLiNi 0.5 co 0.2 mn 0.3 o 2 Disperse in the solution; slowly add 20ml of ammonium bifluoride solution (containing 0.0730g of ammonium bifluoride) dropwise into the solution under constant stirring in a water bath at 95°C, evaporate until the solution is evaporated to dryness, and stand at 70°C for 2 Hours; Finally, put the product in an oven at 100°C for 1 hour; crush the sample through a 400-mesh sieve to obtain a solid powder; put the solid powder into a tube furnace, and raise the temperature to 650°C at a heating rate of 5°C / min under a nitrogen atmosphere Calcined for 1 hour and cooled naturally to room temperature to obtain aluminum fluoride-coated nickel-cobalt lithium manganese oxide LiNi 0.5 co 0.2 mn 0.3 o 2 .

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Abstract

The invention relates to the technical field of the positive electrode material of a lithium ion battery, and particularly to a preparation method for an aluminum-fluoride-coated lithium nickel cobalt manganate positive electrode material. The preparation method for the aluminum-fluoride-coated lithium nickel cobalt manganate positive electrode material comprises the following steps of (1) adding the lithium nickel cobalt manganate positive electrode material into a prepared aluminium salt compound solution to be stirred at a uniform speed; (2) adding a fluorine source compound solution to the mixed solution in a dropwise manner, evaporating the solution after the dropwise adding is finished until the solution is in an evaporated state, then allowing the solution to age and drying the solution; and crushing the sample and sieving the sample by a 400-mesh screen to obtain solid powder; and (3) putting the solid powder obtained in the step (2) in a tubular furnace, roasting the solid powder under a nitrogen atmosphere, and naturally cooling to the room temperature to obtain the aluminum-fluoride-coated lithium nickel cobalt manganate positive electrode material. By adoption of the preparation method, the cycling stability and the rate capability of lithium nickel cobalt manganate are improved; the preparation method is simple in process; and compared with the common coating process, the preparation method provided by the invention is environment-friendly and less in time consumption, low in energy consumption and low in cost, and industrialized production is facilitated.

Description

(1) Technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a preparation method of an aluminum fluoride-coated nickel-cobalt lithium manganese oxide cathode material. (2) Background technology [0002] The current commercial lithium-ion battery cathode materials mainly include layered lithium cobalt oxide (LiCoO 2 ), lithium manganese oxide with spinel structure (LiMn 2 o 4 ), lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ), lithium iron phosphate (LiFePO 4 ) and nickel-cobalt lithium manganese oxide (LiNi 0.5 co 0.2 mn 0.3 o 2 ). Among them, the cost of lithium cobaltate is high, and there are potential safety hazards during overcharging; the structural stability of layered lithium manganate is poor, and the specific capacity of spinel lithium manganate is low, and the structural stability at high temperatures needs to be improved. Lithium nickel manganese oxide requires an electrolyte ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 乔文灿宋春华王瑛王文阁赵成龙薛嘉渔黄振法赵秀萍
Owner SHANDONG YUHUANG NEW ENERGY TECH
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