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Ternary positive electrode material of high-capacity lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems that the increase in material capacity is difficult to meet the demand, the particle size deviation is large, and the mixing of raw materials is uneven, etc., to achieve Eliminate large amounts of wastewater discharge, reduce loss, and facilitate industrial production

Active Publication Date: 2014-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process, uneven mixing of the three raw materials is likely to occur, the particle size deviation is large, and there is also obvious agglomeration phenomenon, and the increase in the capacity of the material is difficult to meet the demand.

Method used

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  • Ternary positive electrode material of high-capacity lithium ion battery and preparation method thereof
  • Ternary positive electrode material of high-capacity lithium ion battery and preparation method thereof
  • Ternary positive electrode material of high-capacity lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Add the stoichiometric ratio of nickel nitrate, cobalt nitrate and manganese nitrate (the molar ratio of nickel salt: cobalt salt: manganese salt is 3:3:14) into deionized water to dissolve, and prepare a solution with a concentration of 0.5 mol / L , And add maltodextrin to it (additional amount is 50% of the mass of LiOH used) to obtain solution c; meanwhile, weigh an appropriate amount of oxalic acid to prepare solution b with a concentration of 0.5 mol / L, and weigh the chemical solution under continuous stirring. The metered ratio of lithium hydroxide (5% excess) was added to solution b, and solution b was slowly added to solution c under stirring to obtain a slurry of nickel, cobalt, manganese and lithium. Continue stirring for 24 hours at room temperature, and then Spray drying in a spray dryer, the inlet temperature and outlet temperature of the spray dryer are 180°C and 70°C, respectively, to obtain the precursor powder. Then the precursor powder was calcined in a ...

Embodiment 2

[0036] Add the stoichiometric ratio of nickel nitrate, cobalt nitrate and manganese nitrate to deionized water to dissolve, prepare a solution a with a concentration of 5 mol / L, and add polyethylene glycol to it (additional amount is 10% of the mass of lithium compound ) To obtain solution c, and at the same time, weigh an appropriate amount of ammonium carbonate and prepare solution b with a concentration of 5 mol / L. Under continuous stirring, slowly add solution b to solution c, weigh the stoichiometric ratio of lithium hydroxide (5% excess) to prepare a small amount of solution, and add it to the above solution to obtain a slurry, and let it stand at room temperature After aging for 24 hours, the slurry is spray-dried to obtain precursor powder. The inlet air temperature of the spray dryer is 200°C and the outlet temperature is 80°C. Then, the precursor powder is calcined in a muffle furnace at 700°C for 5 hours, cooled naturally to room temperature, and finally ground to ob...

Embodiment 3

[0038] Add stoichiometric ratio of nickel acetate, cobalt acetate, and manganese nitrate to deionized water to dissolve, prepare solution a with a concentration of 0.5 mol / L, and add polyethylene glycol to it (additional amount is 25% of the mass of lithium compound ) To obtain solution c. At the same time, weigh an appropriate amount of ammonium carbonate to prepare a solution with a concentration of 0.5 mol / L. After stirring to dissolve, add stoichiometric lithium hydroxide (5% excess) to obtain solution b. Under continuous stirring, the solution b is slowly added to the solution c to obtain a slurry containing nickel, manganese, cobalt and lithium, and stirring is continued for 24 hours at room temperature, and then spray-dried to obtain a precursor powder. Then the precursor powder is calcined in a muffle furnace at 950℃ for 24 h, cooled naturally to room temperature, and finally ground to obtain the cathode material Li 1.5 Ni 0.25 Co 0.25 Mn 0.5 O 2 (The XRD spectrum and sc...

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Abstract

The invention relates to a ternary positive electrode material of a high-capacity lithium ion battery and a preparation method thereof. The ternary positive electrode material contains lithium, manganese, cobalt, nickel and other elements. The preparation method comprises the steps of preparing mixed salt solution of manganese salt, cobalt salt and nickel salt and adding polymer organic matters into the mixed salt solution, adding a precipitate complexing agent and a lithium compound into the solution to prepare a precursor sizing agent, stirring the sizing agent uniformly, preparing precursor particles through a spraying drying method, and roasting in air to obtain the high-capacity positive electrode material, namely LixNiyCozMn(1-y-z)O2, wherein x is more than or equal to 1.2 and less than 1.5, y is more than 0 and less than or equal to 0.5, z is more than 0 and less than or equal to 0.5, and y plus Z is less than 1. The LixNiyCozMn(1-y-z)O2 ternary positive electrode material has high capacity, stable electrochemical performance and simple technique process, is easy to operate, is environmentally friendly, and is suitable for large-scale industrial production and application.

Description

Technical field [0001] The invention relates to a high-capacity lithium ion battery ternary anode material and a preparation method thereof, and belongs to the technical field of new energy material preparation. Background technique [0002] With the global energy problem and the increasingly serious environmental problems caused by the burning of fossil fuels, the development of electric vehicles that do not rely on fossil fuels and are environmentally friendly has become an important development theme in countries around the world. Lithium-ion battery is regarded as a secondary battery that is most likely to be applied to electric vehicles on a large scale due to its many unique advantages. Research on new-type lithium-ion batteries has become one of the most important research topics in related fields. One. Among the many components that affect the performance of lithium-ion batteries, the positive electrode material constituting the battery is the most critical factor that a...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M4/62
CPCH01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 廖世军肖冠宋慧宇舒婷任婉郭文杰曾建皇
Owner SOUTH CHINA UNIV OF TECH
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