Lanthanum and magnesium doped high-nickel ternary lithium battery positive electrode material and preparation method

A ternary lithium battery and cathode material technology, applied in the field of lithium ion materials, to achieve the effects of stable material structure, low cost, and increased ratio

Inactive Publication Date: 2018-09-18
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the existing doping modification scheme does not disclose a scheme that can induce the synthesis of positive electrode materials to preferentially grow into a layered structure, so that the layered structure of the material is more stable and complete. Growth, making the layered structure of the material more stable and complete is of great significance for improving the cycle stability of traditional high-nickel ternary lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh magnesium nitrate, nickel fluoride, cobalt fluoride, manganese fluoride, and lanthanum nitrate powder according to the stoichiometric ratio of 0.02:0.79:0.1:0.1:0.01, and mix magnesium salt, nickel salt, cobalt salt, Add manganese salt and lanthanum salt into the mixer, set the stirring speed to 200-800rpm, stir at high speed, mix evenly, and obtain mixed powder;

[0034] (2) According to the stoichiometric ratio of 1:0.2:0.15, weigh the composition of lithium carbonate, chelating agent ammonia water, ammonium carbonate, ammonium bicarbonate, precipitating agent sodium carbonate, deionized water, mix the chelating agent and deionized water, Stir evenly to obtain a chelating agent solution;

[0035](3) Add the mixed powder to the chelating agent solution according to the stoichiometric ratio of 1.05:1 to obtain a mixed solution of magnesium, nickel, cobalt, manganese, and lanthanum, add a precipitant to the mixed solution, stir evenly, and adjust PH=12, the ch...

Embodiment 2

[0040] (1) Weigh the hydrated magnesium nitrate crystal, nickel nitrate, cobalt nitric acid, manganese nitrate, and hydrated lanthanum nitrate crystal powder according to the stoichiometric ratio of 0.02:0.78:0.1:0.1:0.02, and mix the magnesium salt, nickel salt, and cobalt salt , manganese salt, and lanthanum salt are added to the mixer, and the stirring speed is set to 200-800rpm, stirred at a high speed, mixed evenly, and mixed powder is obtained;

[0041] (2) According to the stoichiometric ratio of 1:0.5:0.15, weigh the mixture of lithium carbonate, ammonia water, and ammonium carbonate as a chelating agent, a precipitating agent, sodium carbonate, and an appropriate amount of deionized water, mix the chelating agent and deionized water, and stir evenly to obtain Chelating agent solution;

[0042] (3) Add the mixed powder to the chelating agent solution according to the stoichiometric ratio of 1.05:1 to obtain a mixed solution of magnesium, nickel, cobalt, manganese, and ...

Embodiment 3

[0047] (1) Weigh magnesium nitrate, nickel hydroxide, cobalt chloride, manganese oxide, and lanthanum nitrate crystal powder according to the stoichiometric ratio of 0.03:0.57:0.2:0.2:0.03, and mix magnesium salt, nickel salt, cobalt salt, Add manganese salt and lanthanum salt into the mixer, set the stirring speed to 200-800rpm, stir at high speed, mix evenly, and obtain mixed powder;

[0048] (2) Weigh lithium hydroxide, chelating agent ammonium bicarbonate, precipitating agent sodium hydroxide, and deionized water according to the stoichiometric ratio of 1:0.6:0.05, mix the chelating agent and deionized water, and stir evenly to obtain the chelating agent solution;

[0049] (3) Add the mixed powder to the chelating agent solution according to the stoichiometric ratio of 1.05:1 to obtain a mixed solution of magnesium, nickel, cobalt, manganese, and lanthanum, add a precipitant to the mixed solution, stir evenly, and adjust PH=12, the chelated alkaline solution is obtained; ...

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Abstract

The invention provides a lanthanum and magnesium doped high-nickel ternary lithium battery positive electrode material and a preparation method. A nickel source, a cobalt source and a manganese sourceare mixed with a lanthanum source and a magnesium source uniformly, then a precipitating agent and a chelating agent are added so as to prepare an NCM precursor paste, and the lanthanum doped high-nickel ternary cathode material Li<1.05-x>Mg<x>Ni<1-2y-z>Co<y>Mn<y>La<z>O<2> is synthesized through pre-sintering and sintering, wherein x is greater than 0 and is less than 0.05, y is greater than 0 and is less than or equal to 0.1, and z is greater than 0 and is less than or equal to 0.05. Through adoption of the high-nickel ternary lithium battery positive electrode material, the defect of low cycle stability of the traditional high-nickel ternary positive electrode material is overcome; lanthanum replaces cobalt and is doped in the lattice, and magnesium replaces lithium and is doped in thelattice, so that the doped lanthanum ions can effectively shorten the length of an axis c in the lattice and improve the ratio of an axis a to the axis c; the positive electrode material is synthesized and is guided to grow a better laminated structure, so that the material structure is more stable; and the doped magnesium impurity prevents cations from being arranged disorderly, so that the electrochemical performance of the positive electrode material is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion materials, in particular to a lanthanum-magnesium co-doped high-nickel ternary lithium battery positive electrode material and a preparation method. Background technique [0002] With the development of electric vehicles, lithium-ion batteries have become the main source of power for electric vehicles. There are various types, each with its own characteristics, and it will be difficult to be replaced by other power sources for a long time in the future. [0003] At present, the main research object of cathode materials for lithium-ion batteries is high-nickel ternary cathodes, whose main advantages lie in high capacity and stable low-temperature performance. However, as the content of nickel ions increases, the instability of the material increases. This is because during the synthesis of the positive electrode material, the content of Mn / Al ions as a skeleton support is less, and the overall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525H01M2220/20Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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