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Quaternary-core and ternary-shell anode material and preparation method thereof, and application thereof

A technology of positive electrode material and core-shell structure, which is applied in the field of quaternary core-ternary shell positive electrode material precursor, which can solve the problems of poor cycle performance and electrochemical stability, high production cost of lithium cobalt oxide, and low battery specific energy, etc. problems, to avoid the impact of particle shape and performance, to eliminate oxygen defects, and to achieve the effect of high crystallinity

Inactive Publication Date: 2019-04-19
LIONANOCHINAINC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode materials of ion batteries that we are familiar with mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, ternary materials, and lithium iron phosphate, etc. However, due to the lack of cobalt resources and high toxicity, the production cost of lithium cobalt oxide is high. However, its cycle performance is poor, which limits its industrial application; lithium manganese oxide has It has the advantages of rich resources, low cost, no pollution, good safety, and good rate performance, but its cycle performance and electrochemical stability are poor, which greatly limits its industrialization; the safety and cycle life of lithium iron phosphate materials are both It has obvious advantages, but the compaction density of the material itself is too low, resulting in low specific energy of the battery, which limits the room for improvement in the cruising range of the vehicle; the cost of ternary materials is low, equivalent to 1 / 4 of lithium cobalt oxide And it is more green and environmentally friendly. Compared with several other materials, the energy density of the battery has been improved, but its safety is not high enough at present.

Method used

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  • Quaternary-core and ternary-shell anode material and preparation method thereof, and application thereof
  • Quaternary-core and ternary-shell anode material and preparation method thereof, and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] A positive electrode material precursor, the positive electrode material precursor is a core-shell structure, and the core-shell molar ratio is 0.7:0.3

[0062] The material chemical formula of the core is Ni 0.815 co 0.15 Al 0.0175 mn 0.0175 CO 3 , the material chemical formula of the shell is Ni 0.50 co 0.20 Al 0.3 (OH) 2 , its preparation method is:

[0063] Step (a), precursor nucleus Ni 0.815 co 0.15 Al 0.0175 mn 0.0175 CO 3 preparation of

[0064] Calculate and weigh soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt according to the molar ratio of each element Ni: Co: Al: Mn = 0.815:0.15: 0.0175: 0.0175; add them together to deionized water for mixing Prepare the first solution A of 1mol / L;

[0065] Mix the first solution A, ammonia water, and sodium carbonate solution, control PH=7, and react at a constant temperature at 60°C for 3h, cool to 30°C, filter, wash, and dry the precipitate to obtain the precursor...

Embodiment 2

[0068] A positive electrode material precursor, the positive electrode material precursor is a core-shell structure, and the core-shell molar ratio is 0.8:0.2

[0069] The material chemical formula of the core is Ni 0.815 co 0.15 Al 0.014 mn 0.021 CO 3 , the material chemical formula of the shell is Ni 0.60 co 0.15 Al 0.25 (OH) 2 , its preparation method is:

[0070] Step (a), precursor nucleus Ni 0.815 co 0.15 Al 0.014 mn 0.021 CO 3 preparation of

[0071] Calculate and weigh soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt according to the molar ratio of each element Ni: Co: Al: Mn = 0.815:0.15: 0.014: 0.021; add them together to deionized water for mixing Prepare the first solution A of 1mol / L;

[0072] Mix the first solution A, ammonia water, and sodium carbonate solution, control PH=7, and react at a constant temperature at 60°C for 3h, cool to 30°C, filter, wash, and dry the precipitate to obtain the precursor core...

Embodiment 3

[0075] A positive electrode material precursor, the positive electrode material precursor is a core-shell structure, the core-shell molar ratio is 0.9:0.1, and the material chemical formula of the core is Ni 0.90 co 0.05 Al 0.03 mn 0.02 CO 3 , the material chemical formula of the shell is Ni 0.60 co 0.20 Al 0.20 (OH) 2 , its preparation method is:

[0076] Step (a), precursor nucleus Ni 0.90 co 0.05 Al 0.03 mn 0.02 CO 3 preparation of

[0077] According to the molar ratio of each element Ni:Co:Al:Mn=0.90:0.05:0.03:0.02

[0078] Calculate and weigh soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt; add them together to deionized water and mix to prepare the first solution A of 1mol / L;

[0079] Mix the first solution A, ammonia water, and sodium carbonate solution, control PH=7, and react at a constant temperature at 60°C for 3h, cool to 30°C, filter, wash, and dry the precipitate to obtain the precursor core Ni 0.90 co 0....

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Abstract

The present invention provides an anode material precursor. The anode material precursor comprises a core-shell structure, the material chemical formula of the core is Ni1-x-y-zCoxAlyMnzCO3, the material chemical formula of the shell is Ni1-r-sCorAls(OH)2, (1-x-y-z) is a value in the range of 0.80- 0.96, x is greater than 0, y is a value in the range of 0.01-0.10, z is a value in the range of 0.01-0.10, (1-r-s) is a value in the range of 0.34- 0.70, r is larger than 0, and s is a value in a range of 0.20-0.40. The anode material is stable in structure, high in safety, long in cycle life and good in thermal stability.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a quaternary core-ternary shell positive electrode material precursor, positive electrode material, preparation method and use. Background technique [0002] As a new type of green energy, lithium-ion batteries have the advantages of high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and no environmental pollution, so they are widely used in mobile phones, notebook computers, digital cameras, etc. At the same time, lithium-ion batteries are also power sources for electric vehicles and energy storage power sources for solar renewable energy. The positive electrode materials of ion batteries that we are familiar with mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, ternary materials, and lithium iron phosphate, etc. However, due to the lack of cobalt resources and high toxicity, the producti...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/058
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 任东于英超沈赟方艳
Owner LIONANOCHINAINC
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