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Preparation method of NCM ternary positive electrode material doped with Y<3+> on surface

A cathode material and surface layer technology, which is applied in the field of preparation of NCM ternary cathode materials, can solve problems such as unstable rate performance, and achieve the effects of improving structural stability and reversible discharge capacity, easy process and technology, and low price.

Inactive Publication Date: 2018-06-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the surface layer structure of NCM ternary positive electrode material is unstable during cycling and the rate performance is poor, the object of the present invention is to provide a surface layer doped Y 3+ The preparation method of NCM ternary positive electrode material, this method is to carry out in the process that the precursor of NCM ternary positive electrode material and lithium salt are mixed Y 3+ doped, doped Y 3+ Enter the transition metal layer on the surface and occupy Ni 2+ position, which can stabilize the structural framework, inhibit the phase transition of the surface structure, and inhibit the Li + / Ni 2+ The role of mixing; in addition, doping Y with larger ionic radius 3+ , can increase the Li + transmission rate, thereby improving the rate performance of NCM ternary cathode materials, especially the electrochemical performance of high voltage and high rate

Method used

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  • Preparation method of NCM ternary positive electrode material doped with Y&lt;3+&gt; on surface
  • Preparation method of NCM ternary positive electrode material doped with Y&lt;3+&gt; on surface
  • Preparation method of NCM ternary positive electrode material doped with Y&lt;3+&gt; on surface

Examples

Experimental program
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Embodiment 1

[0035] LiOH·H 2 O was added to the mortar, and after dry grinding for 15 min, it was mixed with Ni 0.8 co 0.1 mn 0.1 (OH) 2 and Y(NO 3 ) 3 ·6H 2 O was ultrasonicated in ethanol for 1.5h, and then the ultrasonicated mixture was transferred to a mortar, dry-milled for 25min, then added with ethanol and continued to be milled for 25min, then the wet-milled mixture was placed in an oxygen atmosphere, and heated to 450 ℃ and keep it for 6 hours, then raise the temperature to 750 ℃ ​​and keep it for 12 hours, then cool with the furnace to get the surface doped Y 3+ The NCM ternary cathode material Li[Ni 0.79 co 0.1 mn 0.1 Y 0.01 ]O 2 , abbreviated as Y-NCM811; among them, LiOH·H 2 O and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of Y(NO 3 ) 3 ·6H 2 O and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of nickel ions in the medium is 1:79.

[0036] The Y-NCM811 prepared in Example 1 was used as the positive electrode material to assemble a CR2025 button battery, ...

Embodiment 2

[0047] LiOH·H 2 O was added to the mortar, and after dry grinding for 15 min, it was mixed with Ni 0.8 co 0.1 mn 0.1 (OH) 2 and Y(NO 3 ) 3 ·6H 2 O was sonicated in ethanol for 2 hours, and then the sonicated mixture was transferred to a mortar, dry-milled for 25 minutes, then added with ethanol and continued to grind for 25 minutes, then the wet-milled mixture was placed in an oxygen atmosphere, and heated to 450 °C And keep it warm for 6 hours, then raise the temperature to 750°C and keep it warm for 12 hours, and cool down with the furnace to get the surface doped Y 3+ The NCM ternary cathode material Li[Ni 0.795 co 0.1 mn 0.1 Y 0.005 ]O 2 , abbreviated as Y-NCM811; among them, LiOH·H 2 O and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of Y(NO 3 ) 3 with you 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of nickel ions in the medium is 1:159.

[0048] Y-NCM811 prepared by embodiment 2 is assembled into CR2025 button cell as positive electrode material and ca...

Embodiment 3

[0050] LiOH·H 2 O was added to the mortar, and after dry grinding for 15 min, it was mixed with Ni 0.8 co 0.1 mn 0.1 (OH) 2 and Y(NO 3 ) 3 ·6H 2 O was sonicated in ethanol for 2 hours, then the sonicated mixture was transferred to a mortar, dry-milled for 25 minutes, then added with ethanol and continued to grind for 25 minutes, then the wet-milled mixture was placed in an oxygen atmosphere, and heated to 450°C And keep it warm for 6 hours, then raise the temperature to 750°C and keep it warm for 12 hours, and cool down with the furnace to get the surface doped Y 3+ The NCM ternary cathode material Li[Ni 0.785 co 0.1 mn 0.1 Y 0.015 ]O 2 , abbreviated as Y-NCM811; among them, LiOH·H 2 O and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of Y(NO 3 ) 3 ·6H 2 O and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of nickel ions in the medium is 1:52.3.

[0051] Y-NCM811 prepared by embodiment 3 is assembled into CR2025 button cell as positive electrode material and...

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Abstract

Belonging to the field of chemical energy storage batteries, the invention relates to a preparation method of an NCM ternary positive electrode material doped with Y<3+> on the surface. According to the method, Y<3+> doping is carried out in the mixing process of a nickel cobalt manganese hydroxide precursor and a lithium salt, the doped Y<3+> enters a transition metal layer on the surface, occupies the position of Ni<2+>, and can play the role of supporting the framework, inhibiting the surface structural phase transition and inhibiting Li<+> / Ni<2+> mixing. In addition, Y<3+> has a large ionradius, and after being doped into the transition metal layer, is conducive to broadening the insertion and deinsertion channel of Li<+> and improving the Li<+> transmission rate, and can significantly improve the electrochemical properties of the NCM ternary positive electrode material under high voltage and high rate (4.5V, greater than or equal to 1C).

Description

technical field [0001] The invention relates to a surface doped Y 3+ The preparation method of the NCM ternary cathode material belongs to the field of chemical energy storage batteries. Background technique [0002] At present, fossil energy sources such as coal, oil, and natural gas are increasingly depleted. In addition, environmental pollution has gradually become a key issue of concern to all countries. The development of pure electric vehicles and gasoline-gas hybrid vehicles has attracted more and more attention. This requires the rapid development of lithium secondary batteries to meet people's urgent needs for the practical application of new energy batteries. In the family of lithium secondary batteries, lithium cobalt oxide, lithium iron phosphate and ternary materials play an important role in the market in turn. Lithium cobalt oxide is mostly used in small portable electronic devices, while lithium iron phosphate is gradually being replaced by ternary materia...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/052
CPCH01M4/505H01M4/525H01M10/052Y02E60/10
Inventor 李晴苏岳锋吴锋卢赟陈来包丽颖陈实王敬刘娜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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