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
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[0060] Example 1
[0061] A cathode material precursor, the cathode 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 core Ni 0.815 Co 0.15 Al 0.0175 Mn 0.0175 CO 3 Preparation
[0064] Calculate and weigh the 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 in deionized water for mixing Prepare the first solution A of 1mol / L;
[0065] Mix the first solution A, ammonia, and sodium carbonate solution, control PH=7, and react at 60°C for 3h at a constant temperature, then cool to 30°C, filter, wash, and dry the precipitate to obtain the precursor core Ni 0.815 Co 0.15 Al 0.0175 Mn 0...
Example Embodiment
[0067] Example 2
[0068] A cathode material precursor, the cathode 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 core Ni 0.815 Co 0.15 Al 0.014 Mn 0.021 CO 3 Preparation
[0071] Calculate and weigh the 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 in deionized water for mixing Prepare the first solution A of 1mol / L;
[0072] Mix the first solution A, ammonia, and sodium carbonate solution, control PH=7, and react at 60°C for 3h at a constant temperature, then cool to 30°C, filter, wash, and dry the precipitate to obtain the precursor core Ni 0.815 Co 0.15 Al 0.014 Mn 0.021 C...
Example Embodiment
[0074] Example 3
[0075] A cathode material precursor, the cathode material precursor is a core-shell structure, the core-shell molar ratio is 0.9:0.1, and the chemical formula of the core material 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 core Ni 0.90 Co 0.05 Al 0.03 Mn 0.02 CO 3 Preparation
[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 the soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt; add them together in deionized water and mix to prepare the first solution A of 1mol / L;
[0079] Mix the first solution A, ammonia, and sodium carbonate solution, control PH=7, and react at 60°C for 3h at a constant temperature, then cool to 30°C, filter, wash, and dry the precipitate to obtain the precursor core Ni 0.90 Co 0.05 Al 0.03 Mn 0.02 CO 3 ;
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