NCMA core-NCM shell cathode material, preparation method and purpose

A technology of positive electrode material and core-shell structure, which is applied in the field of NCMA core-NCM shell positive electrode material precursor, can solve the problems of poor cycle performance and electrochemical stability, high production cost of lithium cobalt oxide, and low specific energy of the battery. Achieve the effects of avoiding the influence of particle shape and performance, eliminating oxygen defects, and high crystallinity

Inactive Publication Date: 2019-03-29
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

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  • NCMA core-NCM shell cathode material, preparation method and purpose
  • NCMA core-NCM shell cathode material, preparation method and purpose

Examples

Experimental program
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Embodiment 1

[0056] A positive electrode material precursor, the positive electrode material precursor

[0057] It is a core-shell structure, and the core-shell molar ratio is 0.8:0.2

[0058] The material chemical formula of the core is Ni 0.815 co 0.15 al 0.0175 mn 0.0175 (OH) 2 , the material chemical formula of the shell is Ni 0.50 co 0.20 mn 0.3 CO 3 , its preparation method is:

[0059] Step (a), precursor nucleus Ni 0.815 co 0.15 al 0.0175 mn 0.0175 (OH) 2 preparation of

[0060] 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;

[0061] Mix the first solution A, ammonia water, and sodium hydroxide solution, control the pH=7, and react at a constant temperature at 60°C for 3h, cool to 30°C, filter, wash, and dry the precipitate to o...

Embodiment 2

[0064] A positive electrode material precursor, the positive electrode material precursor

[0065] It is a core-shell structure with a core-shell molar ratio of 0.7:0.3

[0066] The material chemical formula of the core is Ni 0.815 co 0.15 al 0.014 mn 0.021 (OH) 2 , the material chemical formula of the shell is Ni 0.60 co 0.15 mn 0.25 CO 3 , its preparation method is:

[0067] Step (a), precursor nucleus Ni 0.815 co 0.15 al 0.014 mn 0.021 CO 3 preparation of

[0068] 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;

[0069] Mix the first solution A, ammonia water, and sodium hydroxide solution, control the 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...

Embodiment 3

[0072] 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 mn 0.20 (OH) 2 , its preparation method is:

[0073] Step (a), precursor nucleus Ni 0.90 co 0.05 al 0.03 mn 0.02 CO 3 preparation of

[0074] According to the molar ratio of each element Ni:Co:Al:Mn=0.90:0.05:0.03:0.02

[0075] 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;

[0076] 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 invention provides a cathode material precursor which is of a core-shell structure. The material chemical formula of the core is Ni<1-x-y-z>Co<x>Al<y>Mn<z>(OH)2, and the material chemical formulaof the shell is Ni<1-r-s>Co<r>Mn<s>CO3, wherein 1-x-y-z is a value in the range of 0.80 to 0.96, x is greater than 0, y is a value in the range of 0.01 to 0.10, z is a value in the range of 0.01 to 0.10, 1-r-s is a value in the range of 0.34 to 0.70, r is greater than 0, and s is a value in the range of 0.20 to 0.40. The cathode material of the invention has a stable structure, high safety performance, long cycle life and good thermal stability.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to an NCMA core-NCM shell positive electrode material precursor, positive electrode material, preparation method and application. 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 productio...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 任东于英超沈赟方艳
Owner LIONANOCHINAINC
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