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High-nickel cobalt-free quaternary positive electrode material and preparation method thereof

A positive electrode material, high nickel technology, applied in positive electrodes, electrical components, battery electrodes, etc., can solve the problems of decreased specific capacity and cycle performance, difficult to industrialize, etc.

Inactive Publication Date: 2020-10-23
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, some scholars have studied the positive electrode materials of binary systems such as lithium nickel manganese oxide, lithium nickel magnesium oxide, and lithium nickel aluminum oxide. However, compared with ternary positive electrode materials, the specific capacity and cycle performance of this binary positive electrode material are different. The degree of decline, so it is difficult to industrialize

Method used

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  • High-nickel cobalt-free quaternary positive electrode material and preparation method thereof
  • High-nickel cobalt-free quaternary positive electrode material and preparation method thereof
  • High-nickel cobalt-free quaternary positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Add nickel sulfate and manganese sulfate into deionized water according to the metal ion molar ratio Ni:Mn=0.95:0.03 to obtain a mixed salt solution, in which the total concentration of metal ions is 2.0mol / L; configure 4.0mol / L NaOH solution. While stirring, the mixed salt solution is added to the reaction kettle filled with 30% bottom liquid, and the drop rate of the NaOH solution is adjusted so that the pH of the solution in the reaction kettle is stable at 11.3, and the reaction temperature is set at 50°C. Oxidation, the whole reaction process continuously feeds N into the solution 2 . After reacting for 20 h, the solution was centrifuged, and the precipitate was washed several times with deionized water, and Ni was obtained after drying. 0.95 mn 0.03 (OH) 1.96 Precursor. Weigh an appropriate amount of the precursor, Al(OH) 3 , Mg(OH) 2 and LiOH, wherein the molar ratio of metal elements is Ni:Mn:Al:Mg:Li=0.95:0.03:0.01:0.01:1.05, the four are uniformly mixed,...

Embodiment 2

[0029] Add nickel sulfate, manganese sulfate, and magnesium sulfate into deionized water according to the molar ratio of metal ions Ni:Mn:Mg=0.9:0.08:0.01 to obtain a mixed salt solution, in which the total concentration of metal ions is 5.0mol / L; configure 10.0mol / L of KOH solution. While stirring, add the mixed salt solution into the reaction kettle filled with 10% bottom liquid, adjust the drop rate of the KOH solution, so that the pH of the solution in the reaction kettle is stable at 12.0, and the reaction temperature is set at 40°C. Oxidation, throughout the reaction, continuously feed Ar into the solution. After reacting for 40 h, the solution was centrifuged, and the precipitate was washed several times with deionized water, and Ni was obtained after drying. 0.9 mn 0.08 Mg 0.01 (OH) 1.98 Precursor. Weigh an appropriate amount of the precursor, ZrO 2 and LiNO 3 , wherein the molar ratio of metal elements is Ni:Mn:Mg:Zr:Li=0.9:0.08:0.01:0.01:1.08, the three are e...

Embodiment 3

[0031]Add nickel sulfate and manganese sulfate into deionized water according to the metal ion molar ratio Ni:Mn=0.8:0.18 to obtain a mixed salt solution, in which the total concentration of metal ions is 1mol / L; configure 2.0mol / L NaOH solution. While stirring, the mixed salt solution is added to the reaction kettle filled with 20% bottom liquid, and the drop rate of the NaOH solution is adjusted so that the pH of the solution in the reaction kettle is stable at 11, and the reaction temperature is set at 60°C. Oxidation, the whole reaction process continuously feeds N into the solution 2 . After reacting for 10 h, the solution was centrifuged, and the precipitate was washed several times with deionized water, and Ni was obtained after drying. 0.8 mn 0.18 (OH) 1.96 Precursor. Weigh an appropriate amount of the precursor, TiO 2 、WO 3 and Li 2 CO 3 , wherein the molar ratio of metal elements is Ni:Mn:Ti:W:Li=0.8:0.18:0.01:0.01:1.1, the four are evenly mixed, placed in a ...

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Abstract

The invention discloses a high-nickel cobalt-free quaternary positive electrode material and a preparation method thereof. The chemical formula of the positive electrode material is LiNixMnyMzN(1-x-y-z)O2, wherein x is greater than or equal to 0.8 and less than 1, y is greater than 0 and less than 0.2, z is greater than 0 and less than 0.2, and M and N are combinations of any two of Al, Mg, Zr, Ti, Cr, W, V, Ce, Fe, Cu, Zn and Nb. The method has the main advantages that an expensive cobalt element is not used, an ammonia water complexing agent is not used in the precursor preparation process,the alkali content of the surface of the high-nickel cobalt-free quaternary positive electrode material obtained through primary sintering is low, and the washing and secondary sintering processes ofthe material are not involved, so the preparation cost is greatly reduced; and besides, the high-nickel cobalt-free quaternary positive electrode material has excellent rate capability, the specific capacity at 1 C rate reaches 200 mAh / g or above, the cycling stability is excellent, and the capacity retention ratio exceeds 95% after 500 cycles.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a high-nickel and cobalt-free ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have high energy density and long life, making them an ideal energy source for electric vehicles and other power tools. Among the layered transition metal oxide cathode materials, nickel-cobalt lithium manganese oxide has a high specific capacity, so it has attracted many people's research. [0003] In the nickel-cobalt lithium manganate cathode material, nickel mainly plays the role of participating in the redox reaction and providing capacity, cobalt has the function of stabilizing the structure, inhibiting lithium-nickel mixing and phase transition, and manganese mainly improves thermal stability and safety. Sexuality. The synergistic effect among nickel, cobalt and manganese makes nickel-cobalt-lithium mang...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 高剑谭铁宁刘洋王铭
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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