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High-voltage cathode material Li delta Co(1-x)MgxO2@AlF3 of lithium ion battery and preparation method of high-voltage cathode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor electrochemical performance, and achieve the effects of improving electrical conductivity, good intercalation and deintercalation, and enhanced stability

Active Publication Date: 2016-11-09
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to aim at the layered LiCoO of lithium-ion battery high-voltage cathode material 2 The shortcomings of poor electrochemical performance at high potentials provide a layered cathode material Li with a combination of bulk phase doping modification and surface coating δ co 1-x Mg x o 2 @AlF 3 and its preparation method, wherein 1≤δ≤1.05, 0

Method used

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  • High-voltage cathode material Li delta Co(1-x)MgxO2@AlF3 of lithium ion battery and preparation method of high-voltage cathode material
  • High-voltage cathode material Li delta Co(1-x)MgxO2@AlF3 of lithium ion battery and preparation method of high-voltage cathode material
  • High-voltage cathode material Li delta Co(1-x)MgxO2@AlF3 of lithium ion battery and preparation method of high-voltage cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 0.0525mol (3.8792g) of lithium carbonate, 0.0323mol (7.7858g) of cobalt tetroxide, 0.0030mol (0.7692g) of magnesium nitrate hexahydrate and 15mL of absolute ethanol into a ball mill jar to obtain a mixed solution A;

[0035] After mixing the mixed solution A with 100g ball milling beads, they were ball milled together for 12 hours to obtain the mixed solution B; the mixed solution B was dried at 105°C for 24 hours to obtain a black powder; the obtained black powder was placed in a muffle furnace, The heating rate is 3°C / min, and it is kept at 750°C for 10 hours. After the heat preservation is over, it is cooled with the furnace. After the cooling is completed, take it out and grind it to obtain the intermediate product of pre-sintered material; put the intermediate product of pre-sintered material in the muffle furnace , the heating rate is still 3°C / min, and keep warm for 12 hours after reaching 920°C, and then cool with the furnace. 1.05 co 0.97 Mg 0.03 o 2 ;...

Embodiment 2

[0039] Weigh 0.1050mol (7.7584g) of lithium carbonate, 0.0646mol (15.5717g) of cobalt tetroxide, 0.0060mol (1.5384g) of magnesium nitrate hexahydrate and 25mL of absolute ethanol into a ball mill jar to obtain a mixed solution A;

[0040] After mixing the mixed solution A with 150g ball milling beads, they were ball milled together for 12 hours to obtain the mixed solution B; the mixed solution B was dried at 105°C for 24 hours to obtain a black powder; the obtained black powder was placed in a muffle furnace, The heating rate is 3°C / min, and it is kept at 750°C for 12 hours. After the heat preservation is over, it is cooled with the furnace. After the cooling is completed, it is taken out and ground to obtain the intermediate product of the calcined material; the intermediate product of the calcined material is placed in the muffle furnace , the heating rate is 2°C / min, and the temperature is kept at 950°C for 12 hours. After the heat preservation is completed, it is cooled wi...

Embodiment 3

[0043] Weigh 0.0525mol (3.8792g) of lithium carbonate, 0.0323mol (7.7858g) of cobalt tetroxide, 0.0030mol (0.7692g) of magnesium nitrate hexahydrate and 15mL of absolute ethanol into a ball mill jar to obtain a mixed solution A;

[0044] After mixing the mixed solution A with 100g ball milling beads, they were ball milled together for 12 hours to obtain the mixed solution B; the mixed solution B was dried at 105°C for 24 hours to obtain a black powder; the obtained black powder was placed in a muffle furnace, The heating rate is 3°C / min, and it is kept at 750°C for 10 hours. After the heat preservation is over, it is cooled with the furnace. After the cooling is completed, take it out and grind it to obtain the intermediate product of pre-sintered material; put the intermediate product of pre-sintered material in the muffle furnace , the heating rate is still 3°C / min, keep warm for 12 hours after reaching 1000°C, and then cool with the furnace. 1.05 co 0.97 Mg 0.03 o2 .

[...

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Abstract

The invention belongs to the field of lithium ion batteries, and provides a cathode material Li delta Co(1-x)MgxO2@AlF3 of a lithium ion battery and a preparation method of the cathode material. According to the cathode material Li delta Co(1-x)MgxO2@AlF3, delta is larger than or equal to 1 and smaller than or equal to 1.05, x is larger than 0 and smaller than or equal to 0.05, and the defect of poor electrochemical performance of laminar LiCoO2 under high potential is overcome. The bulk-phase doping modification and surface coating combined laminar cathode material Li delta Co(1-x)MgxO2@AlF3 has higher specific discharge capacity and very stable circulation performance; at the room temperature, at 0.5 C rate and within the charge-discharge voltage range of 2.75-4.4 V (vs.Li / Li<+>), the first specific discharge capacity can reach 187.6 mAh / g, the 3.8V platform capacity approaches 100%, the capacity can reach 180 mAh / g after 30 times of circulation, and the capacity retention ratio is 96%. Besides, the provided material preparation method adopts a simple preparation process, the preparation cost is low, and large-scale industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a lithium ion battery positive electrode material Li δ co 1-x Mg x o 2 @AlF 3 And the preparation method thereof, wherein 1≤δ≤1.05, 0<x≤0.05. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices such as mobile phones, notebook computers, and digital cameras because of their high potential, high energy density, long cycle life, and no memory. In recent years, lithium-ion batteries have been widely used in electric vehicles. applications are also maturing. There are many systems of cathode materials for lithium-ion batteries in research at present, but the commercial products produced on a large scale are mainly lithium cobalt oxide (LiCoO 2 ) cathode material; and LiMn 2 o 4 Compared with LiCoO 2 In terms of price, i...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/62
CPCH01M4/505H01M4/628Y02E60/10
Inventor 刘兴泉谭铭刘珊珊蔡宇王震伟赵红远
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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