High-nickel cathode material rich in rock salt phase on the surface, and a preparation method and application thereof
A positive electrode material, high-nickel technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of comprehensive performance of ternary materials, unstable surface chemical properties of materials, poor effect of ternary materials, etc. , to achieve significant cycle performance, great theoretical and practical significance, and broad prospects for commercial application
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[0043] Example 1
[0044] Embodiment 1 of the present invention provides a method for preparing a high-nickel ternary cathode material for lithium ion batteries doped with high-valence transition metal ions and rich in rock salt phase on the surface. The specific steps are as follows:
[0045] (1) Take 300g Ni 0.88 Co 0.09 Al 0.03 (OH) 2 Precursor and 3.16g MnO 2 The particles are uniformly mixed (weighed according to 1% coating amount), and then mixed at high speed in a mechanical fusion machine with a linear speed of 13m / s and a mixing time of 5min to obtain a uniform coating of MnO 2 Ni 0.88 Co 0.09 Al 0.03 (OH) 2 Precursor, uniformly coated with MnO 2 Ni 0.88 Co 0.09 Al 0.03 (OH) 2 See the scanning electron micrograph of the precursor figure 1 ;
[0046] (2) Li: (Ni+Co+Al)=1.03:1 by mole ratio, the lithium hydroxide and step (1) are coated with MnO 2 Ni 0.88 Co 0.09 Al 0.03 (OH) 2 The precursors are mixed and calcined in an oxygen atmosphere at a temperature of 740°C for 20 hours ...
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[0051] Example 2
[0052] Embodiment 2 of the present invention provides a method for preparing a high-nickel ternary positive electrode material for lithium ion batteries doped with high-valence transition metal ions and rich in rock salt phase on the surface. The specific steps are as follows:
[0053] (1) Take 300g Ni 0.88 Co 0.09 Al 0.03 (OH) 2 Precursor and 6.32g MnO 2 The particles are uniformly mixed (weighed according to 2% coating amount), and then mixed at high speed in a mechanical fusion machine with a linear speed of 13m / s and a mixing time of 5min to obtain a uniform surface coating of MnO 2 Ni 0.88 Co 0.09 Al 0.03 (OH) 2 Precursor, uniformly coated with MnO 2 Ni 0.88 Co 0.09 Al 0.03 (OH) 2 See the scanning electron micrograph of the precursor Figure 4 ;
[0054] (2) The molar ratio Li: (Ni+Co+Al) = 1.03:1 Lithium hydroxide and step (1) are coated with MnO 2 Ni 0.88 Co 0.09 Al 0.03 (OH) 2 The precursors are mixed and calcined in an oxygen atmosphere at a temperature of ...
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