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Core-shell structure nickel-cobalt-manganese ternary cathode material precursor and preparation method thereof

A technology of cathode material and core-shell structure, which is applied in the field of core-shell structure nickel-cobalt-manganese ternary cathode material precursor and its preparation, can solve the problems of cumbersome preparation process, poor rate performance, and low capacity, and achieve simple process and low cost. The effect of low and shortened diffusion channels

Active Publication Date: 2019-07-16
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although high-density nickel-cobalt-lithium manganese oxide can be obtained by controlling the nucleation structure, particle size and distribution of the precursor, the capacity of the material is low even if it is used as a full battery for performance testing, only 150mAh / m at 0.5C. g
[0007] Therefore, in the actual application process, the high-nickel ternary materials prepared by the existing technology still have problems such as poor cycle performance, poor rate performance, cumbersome preparation process, and high cost.

Method used

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  • Core-shell structure nickel-cobalt-manganese ternary cathode material precursor and preparation method thereof
  • Core-shell structure nickel-cobalt-manganese ternary cathode material precursor and preparation method thereof
  • Core-shell structure nickel-cobalt-manganese ternary cathode material precursor and preparation method thereof

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Embodiment 1

[0054] The precursor of the ternary positive electrode material is a core-shell structure particle with an average particle diameter of 10 μm, wherein the average diameter of the inner core is 8 μm, the average thickness of the shell layer is 2 μm, and the shell layer has micropores with a pore size of 0.2-0.5 μm; wherein, The chemical formula of the core is Ni 0.9 co 0.1 (OH) 2 ; The chemical formula of the shell is Ni 0.7 co 0.1 mn 0.2 CO 3 .

[0055] Example 1 of the preparation method of the precursor of the core-shell structure nickel-cobalt-manganese ternary positive electrode material

[0056] (1) Mix 2L nickel-cobalt solution with high nickel content (a mixed solution of nickel sulfate and cobalt sulfate, wherein the molar percentages of Ni and Co in the total metal ions are 90% and 10% respectively, and the metal ion concentration is 2mol / L) with The feeding rate is 80mL / h, pump into the reaction kettle with 2L ammonia solution with a molar concentration of 0.4...

Embodiment 2

[0066] The precursor of the ternary cathode material is a core-shell structure particle with an average particle diameter of 10 μm, wherein the average diameter of the inner core is 6 μm, the average thickness of the shell layer is 4 μm, and the shell layer has micropores with a pore size of 0.1-0.4 μm; wherein, The chemical formula of the core is Ni 0.8 co 0.1 mn 0.1 (OH) 2 ; The chemical formula of the shell is Ni 0.4 co 0.2 mn 0.4 CO 3 .

[0067] Example 2 of the preparation method of the precursor of the core-shell structure nickel-cobalt-manganese ternary positive electrode material

[0068] (1) Mix 2L nickel-cobalt-manganese solution with high nickel content (a mixed solution of nickel nitrate, cobalt nitrate and manganese nitrate, wherein the molar percentages of Ni, Co, and Mn in the total metal ions are 80%, 10%, and 10%, respectively, The metal ion concentration is 2.5mol / L) at a feed rate of 60mL / h, pump 1.8L of ammonia solution with a molar concentration of...

Embodiment 3

[0078] The precursor of the ternary cathode material is a core-shell structure particle with an average particle diameter of 11 μm, wherein the average diameter of the inner core is 8 μm, the average thickness of the shell layer is 3 μm, and the shell layer has micropores with a pore size of 0.1-0.5 μm; wherein, The chemical formula of the core is Ni 0.85 co 0.15 (OH) 2 ; The chemical formula of the shell is Ni 0.55 co 0.15 mn 0.3 CO 3 .

[0079] Example 3 of the preparation method of the precursor of the core-shell structure nickel-cobalt-manganese ternary positive electrode material

[0080] (1) Mix 2L high-nickel-content nickel-cobalt-manganese solution (a mixed solution of nickel chloride and cobalt chloride, wherein the molar percentages of Ni and Co in the total metal ions are 85% and 15% respectively, and the metal ion concentration is 1.5mol / L) At a feed rate of 100mL / h, pump 2.2L of ammonia solution with a molar concentration of 0.40mol / L into a 5L reaction ke...

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Abstract

The invention discloses a core-shell structure nickel-cobalt-manganese ternary positive electrode material precursor and a preparation method thereof. The ternary positive electrode material precursoris a core-shell structure particle with an average particle diameter of 5-12 [mu]m. The chemical formula of a core is Ni<x>Co<y>Mn<1-x-y>(OH)<2>, wherein <x> is greater than or equal to 0.6 and is less than or equal to 0.9, <y> is greater than or equal to 0.1 and is less than or equal to 0.4, and <1-x-y> is greater than or equal to 0. The chemical formula of a shell is Ni<x>Co<y>Mn<1-x-y>CO<3>, wherein <x> is greater than or equal to 0.4 and is less than or equal to 0.7, <y> is greater than or equal to 0.1 and is less than or equal to 0.4, and <1-x-y> is greater than 0. A ternary positive electrode material made by lithium mixing and sintering of the core-shell structure nickel-cobalt-manganese ternary positive electrode material precursor is assembled into a battery, and excellent electrochemical performance is exhibited. The preparation method is simple in process, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a nickel-cobalt-manganese ternary cathode material precursor and a preparation method thereof, in particular to a core-shell structure nickel-cobalt-manganese ternary cathode material precursor and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, lithium-ion batteries are widely used as new energy storage batteries due to their many advantages. During the development of lithium-ion batteries, nickel-cobalt-manganese ternary materials are considered to be one of the most promising cathode materials for lithium-ion batteries due to their high voltage, high specific capacity, low cost, and excellent cycle and rate performance. [0003] At present, in order to increase the energy density of ternary materials, two methods are mainly used: one is to prepare dense spherical particles, and the spherical shape of lithium-ion battery ternary materials has good processing pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 童汇王旭姚赢赢周其杰喻万景
Owner ZHUJI PAWA NEW ENERGY
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