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A kind of anode material of aluminum-containing nickel-cobalt-manganese core-shell structure and preparation method thereof

A core-shell structure, nickel-cobalt-manganese technology, applied to structural parts, battery electrodes, batteries, etc., can solve the problems of ternary NCM material structure stability and cycle performance degradation, and achieve low cost, good cycle performance, and battery capacity high effect

Active Publication Date: 2020-12-25
宁波纳微新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as cation / anion doping, coating, design of concentration gradient, etc. However, the actual capacity of the improved ternary NCM precursor material is still below 200mAh / g, and the structural stability and cycle stability of the improved ternary NCM material Performance is also greatly reduced

Method used

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  • A kind of anode material of aluminum-containing nickel-cobalt-manganese core-shell structure and preparation method thereof
  • A kind of anode material of aluminum-containing nickel-cobalt-manganese core-shell structure and preparation method thereof
  • A kind of anode material of aluminum-containing nickel-cobalt-manganese core-shell structure and preparation method thereof

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preparation example Construction

[0028] The invention provides a method for preparing a ternary precursor of an aluminum-containing nickel-cobalt-manganese core-shell structure, comprising the following steps:

[0029] A) The mixed solution of nickel source and cobalt source is fed together with the manganese source solution, and mixed with a precipitating agent and a complexing agent, and coprecipitation occurs;

[0030] B) Stop feeding the manganese source solution in step A), feed the aluminum source solution together with the mixed solution of the nickel source and the cobalt source, and coprecipitate reaction occurs;

[0031] Steps A) and B) are repeated 0-4 times to obtain a ternary precursor of nickel-cobalt-manganese core-shell structure containing aluminum.

[0032] The preparation method of the aluminum-containing nickel-cobalt-manganese core-shell structure ternary precursor provided by the present invention first prepares a mixed solution of nickel source and cobalt source, a manganese source solu...

Embodiment 1

[0064] A method for preparing a ternary precursor of an aluminum-containing nickel-cobalt-manganese core-shell structure, comprising the steps of:

[0065] (1) The soluble salt mixed solution of preparation nickel, cobalt, concentration is 1mol / L, and nickel, cobalt atomic ratio are 8; The soluble salt solution of manganese, concentration is 0.5mol / L; The soluble salt solution of aluminum, concentration is 0.5mol / L;

[0066] (2) The soluble mixed salt solution of nickel and cobalt and the soluble salt solution of manganese are fed simultaneously, and sodium hydroxide and ammoniacal liquor are added, the pH value of the control reaction is between 12, the coprecipitation reaction is completed, and the reaction is 15 hours;

[0067] (3) stop the feeding of manganese salt in (2), start to feed aluminum salt, the soluble mixed salt solution of both nickel and cobalt and the soluble salt solution of aluminum feed simultaneously, and add sodium hydroxide and ammoniacal liquor, cont...

Embodiment 2

[0072] A method for preparing a ternary precursor of an aluminum-containing nickel-cobalt-manganese core-shell structure, comprising the steps of:

[0073] (1) the soluble salt mixed solution of preparation nickel, cobalt, concentration is 2mol / L, and nickel, cobalt atomic ratio are 8; The soluble salt solution of manganese, concentration is 0.25mol / L; The soluble salt solution of aluminum, concentration is 0.25mol / L;

[0074] (2) The soluble mixed salt solution of nickel and cobalt and the soluble salt solution of manganese are fed simultaneously, and sodium hydroxide and ammoniacal liquor are added, the pH value of the control reaction is at 11.5, and the coprecipitation reaction is completed, and the reaction is 20 hours;

[0075] (3) stop the feeding of manganese salt in (2), start to feed aluminum salt, the soluble mixed salt solution of both nickel and cobalt and the soluble salt solution of aluminum feed simultaneously, and add sodium hydroxide and ammoniacal liquor, c...

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Abstract

The invention provides a preparation method of a positive pole material of a Ni-Co-Mn core-shell structure including aluminum. The preparation method comprises the following steps of mixing a ternaryprecursor of the Ni-Co-Mn core-shell structure including aluminum prepared by the preparation method disclosed by the technical scheme with a lithium source, and calcining to acquire the positive polematerial. The preparation method of the ternary precursor of the Ni-Co-Mn core-shell structure including aluminum comprising the following steps of A, jointly feeding the mixed liquid of a nickel source and a cobalt source and manganese source solution, and mixing with a precipitator and a complexing agent to perform a coprecipitation reaction; and B, stopping feeding the manganese source solution in the step A, jointly feeding aluminum source solution with the mixed liquid of the nickel source and the cobalt source to perform the coprecipitation reaction; and repeating the steps A and B for0-4 times to acquire the ternary precursor of the Ni-Co-Mn core-shell structure including aluminum. According to the method provided by the invention, the manganese and aluminum are alternatively doped via the coprecipitation method, thus giving full play to the effect of the stable structure of the doping element, and the finally prepared positive pole material battery is high in capacity and good in cycle performance. The cost is low, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an anode material with an aluminum-containing nickel-cobalt-manganese core-shell structure and a preparation method thereof. Background technique [0002] Portable electronics and electric vehicles mainly use lithium-ion batteries as energy storage devices. With the continuous improvement of their endurance requirements, lithium-ion batteries also need higher capacity, better safety, and longer life. Among all the components of lithium-ion batteries, especially after the invention of ultra-concentrated electrolytes, electrode materials have become the main bottleneck in improving their energy density. A promising ternary cathode material: LiNi 1-2x co x mn x o 2 (NCM), when the voltage is in the range of 3.0-4.3V, the specific capacitance is only 130-150mAh / g, and it has a long period and cycle life. And it is reported that when the battery capacity of the mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 周明炯肖婷赵伟倩
Owner 宁波纳微新能源科技有限公司