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Ternary cathode material and preparation method of the material and its precursor

A cathode material and precursor technology, applied in the field of battery materials, can solve problems such as no solutions, and achieve the effects of excellent cycle rate performance, high activity, and reduced surface nickel content

Active Publication Date: 2019-05-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For the technical problems existing in the above prior art description, no effective solution has been proposed yet

Method used

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  • Ternary cathode material and preparation method of the material and its precursor
  • Ternary cathode material and preparation method of the material and its precursor
  • Ternary cathode material and preparation method of the material and its precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A LiNi with a special structure 0.8 co 0.1 mn 0.1 o 2 Ternary positive electrode material, its preparation method comprises the following steps:

[0054] Preparation of Ternary Oxide Precursor by S1 Spray Pyrolysis

[0055] NiCl 2 , CoCl 2 and MnCl 2 According to the ratio (molar ratio) of 8:1:1, a solution with a total metal ion concentration of 0.5mol / L was formulated. After the solution was ultrasonically atomized, it was loaded into the pyrolysis furnace by an oxygen carrier gas, and the flow rate of oxygen was 4L / min. , pyrolyzed at 750 °C to obtain Ni 0.8 co 0.1 mn 0.1 o x After the precursor, it is collected by upper nickel mesh filtration;

[0056] S2 Prepare co-precipitation reaction seed crystals

[0057] 2g Ni 0.8 co 0.1 mn 0.1 o x The oxide precursor was added to the bottom of the co-precipitation reactor as a seed crystal; 500ml of 3mol / L ammonia water was configured, and 300mL was poured into the coprecipitation reactor as the bottom liquid...

Embodiment 2

[0068] A LiNi with a special structure 0.85 co 0.075 mn 0.075 o 2 Ternary positive electrode material, its preparation method comprises the following steps:

[0069] Preparation of Ternary Oxide Precursor by S1 Spray Pyrolysis

[0070] NiCl 2 , CoCl 2 and MnCl 2 According to the ratio (molar ratio) of 34:15:15, a solution with a total metal ion concentration of 0.5mol / L was formulated. After the solution was ultrasonically atomized, it was loaded into the pyrolysis furnace by oxygen, and the flow rate of oxygen was 4L / min. Ni obtained at 780°C 0.85 co 0.075mn 0.075 o x After the precursor, it is collected by upper nickel mesh filtration;

[0071] S2 Prepare co-precipitation reaction seed crystals

[0072] 1.8g Ni 0.85 co 0.075 mn 0.075 o x The oxide precursor was added to the bottom of the co-precipitation reactor as a seed crystal; 500ml of 3mol / L ammonia water was configured, and 200mL was poured into the coprecipitation reactor as the bottom liquid, and slow...

Embodiment 3

[0083] A ternary cathode material LiNi with a special structure 0.5 co 0.25 mn 0.25 o 2 @LiNi 0.9 co 0.05 mn 0.05 o 2 , its preparation method comprises the following steps:

[0084] Preparation of Ternary Oxide Precursor by S1 Spray Pyrolysis

[0085] NiCl 2 ·6H 2 O, CoCl 2 ·6H 2 O, MnCl 2 4H 2 O is dissolved in water at 18:1:1 (molar ratio) to make a solution with a total metal ion concentration of 0.6mol / L. After the solution is ultrasonically atomized, it is loaded into the pyrolysis furnace by oxygen, and the flow rate of oxygen is 6L / L. min, Ni obtained by pyrolysis at 750°C 0.9 co 0.05 mn 0.05 o x After the precursor, it is collected by upper nickel mesh filtration;

[0086] S2 Prepare co-precipitation reaction seed crystals

[0087] 2g Ni 0.9 co 0.05 mn 0.05 o x The oxide precursor was added to the bottom of the co-precipitation reactor as a seed crystal; 500ml of 2mol / L ammonia water was configured, and 300mL was poured into the coprecipitation ...

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Abstract

The invention provides a ternary precursor with a composite hetero-structure. The molecular formula of the ternary precursor is Ni<1-a-b>CoM(OH)2@Ni<1-x-y>Co<x>M<y>O<z>, wherein 0<a<1, 0<b<1, 0<a+b<1, 0<x<1, ,0<y<1, 0<x+y<1, 1<z<1.5, and M represents Mn or Al. The ternary precursor comprises a ternary oxide precursor and a ternary hydroxide precursor. The ternary hydroxide precursor is coated on the surface of the ternary oxide precursor. The molecular formula of the ternary oxide precursor is Ni<1-x-y>Co<x>M<y>O<z>, and the molecular formula of the ternary hydroxide precursor is Ni<1-a-b>CoM(OH)2. The invention further provides a preparation method of the ternary precursor. According to the preparation method, a spray pyrolysis method and a co-precipitation method are combined, the ternary oxide precursor obtained by spray pyrolysis is taken as the seed crystal, then a layer of ternary hydroxide precursor is coated on the surface of the ternary oxide precursor through theco-precipitation method to obtain the ternary precursor, and the ternary precursor and lithium salts are mixed and sintered to prepare the ternary cathode material. The ternary cathode material has the advantages of good layered structure, high initial efficiency, high specific capacity, and excellent circulating ratio performance.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a ternary positive electrode material, a precursor thereof, and a method for preparing the material and the precursor. Background technique [0002] With the popularization of 3C electronic products and the development of portable electronic products in the direction of ultra-thin, fine and multi-functional, lithium-ion batteries have high specific energy, long cycle life, high working voltage, small self-discharge, no memory effect, volume It occupies a dominant position because of its small size, light weight, and environmental friendliness. As one of the key materials of lithium-ion batteries, cathode materials largely determine the energy density, power density and cycle life of lithium-ion batteries. The layered nickel-cobalt lithium manganese oxide ternary positive electrode material combines the excellent cycle performance of lithium cobalt oxide, the high capacity charac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 王接喜李艳王志兴李新海郭华军李滔胡启阳彭文杰
Owner CENT SOUTH UNIV
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