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Preparation method of nickel-cobalt lithium manganese oxide, lithium-ion secondary battery cathode material

A technology of nickel-cobalt lithium manganese oxide and secondary batteries, which is applied in the field of preparation of positive electrode materials for lithium electronic secondary batteries, can solve problems such as the inevitable reduction of output characteristics, and achieve the effects of excellent productivity and excellent pressurized density

Active Publication Date: 2015-12-02
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, there is also LixNi1-y-zCoyMnzO 2 In such a substance, the proportion of Co is reduced, the cost is reduced, and the proportion of Ni is increased, the discharge capacity is improved. However, in general, the proportion of Co is decreased, and the output characteristics are inevitably reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of preparation method of nickel-cobalt lithium manganate lithium ion secondary battery cathode material, comprises the following steps:

[0030] a) Mix nickel cobalt manganese hydroxide or nickel oxyhydroxide cobalt manganese powder and lithium carbonate powder in a dry mixer at a molar ratio of Li / (Ni+Co+Mn) of 1.0, and the mixed powder is filled in ceramic In a square open container;

[0031] b) Calcining the mixture obtained in step a) at 250°C at a heating rate of 4°C / min or less, then heating at 3°C / min or less, and then calcining at 850°C, the calcination time For 8 hours, calcined in an oxygen-containing atmosphere at 850°C for 5 hours. The sintered product is a homogeneous product. Use a laser scattering particle size distribution measuring device with water as the dispersion medium to measure the cobalt acid in the primary particles obtained by crushing the calcined product. As a result of the particle size distribution of the lithium powder, the averag...

Embodiment 2

[0039] A kind of preparation method of nickel-cobalt lithium manganate lithium ion secondary battery cathode material, comprises the following steps:

[0040] b) Mix nickel cobalt manganese hydroxide or nickel oxyhydroxide cobalt manganese powder and lithium carbonate powder in a dry mixer at a molar ratio of Li / (Ni+Co+Mn) of 1.03, and the mixed powder is filled in ceramic In a square open container;

[0041] b) The mixture obtained in step a) is calcined at 500°C at a heating rate below 2°C / min, then heated at a temperature below 2°C / min, and then calcined at 900°C, the calcination time For 20 hours, the calcined sintered product is a homogeneous product in an oxygen-containing atmosphere at 900 ° C.

[0042] c) naturally cooling the calcined product to room temperature, and then pulverizing it to become a semi-finished product;

[0043] d) Then carry out the surface of the semi-finished nickel-cobalt lithium manganese oxide: 1) Mixing and stirring: wherein, the coating com...

Embodiment 3

[0049] A kind of preparation method of nickel-cobalt lithium manganate lithium ion secondary battery cathode material, comprises the following steps:

[0050] c) Mix nickel cobalt manganese hydroxide or nickel oxyhydroxide cobalt manganese powder and lithium carbonate powder in a dry mixer at a molar ratio of Li / (Ni+Co+Mn) of 1.2, and the mixed powder is filled in ceramic In a square open container;

[0051] b) Calcining the mixture obtained in step a) at 1100°C at a heating rate of 2°C / min or less, then heating at 3°C / min or less, and then calcining at 1100°C, the calcination time for 55 hours,

[0052] c) naturally cooling the calcined product to room temperature, and then pulverizing it to become a semi-finished product;

[0053] d) Then carry out the surface of the semi-finished nickel-cobalt lithium manganese oxide: 1) Mixing and stirring: wherein, the coating component is Mg, and the molar ratio of the coating component to the nickel-cobalt-manganese in nickel-cobalt-l...

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PUM

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Abstract

The invention discloses a preparation method for a positive electrode material-lithium nickel manganese cobalt of a lithium ion secondary battery. The preparation method comprises the following steps of a) mixing nickel cobalt manganese hydroxide or nickel cobalt manganese oxyhydroxide powder and lithium carbonate powder according to a molar ratio of Li / (Ni+Co+Mn) being 1.0-1.2; b) roasting the mixture obtained by the step a) for 5-55 hours at the temperature of 850-1,100 DEG C in an oxygen-containing atmosphere; c) cooling the roasted material to the room temperature naturally and then smashing the roasted material; and d) carrying out a coating component treatment process on the surface of a semi-finished product of lithium nickel manganese cobalt by an apparatus with a high-speed shearing force. The positive electrode being used as the lithium ion secondary battery has excellent characteristics in aspects such as volume capacity density, security, charge-discharge cycle endurance, pressure density, predictability, etc.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion secondary battery, in particular to a preparation method of nickel cobalt lithium manganese oxide, a positive electrode material of a lithium ion secondary battery. Background technique [0002] In recent years, with the popularization and miniaturization of portable devices such as mobile phones and notebook computers, non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries have gradually been used as their power sources. Moreover, from the perspective of coping with recent environmental problems, it is also attracting attention as a power battery for electric vehicles and the like. [0003] Generally, LiCoO is widely used as a positive electrode active material for lithium secondary batteries. 2 (Lithium cobaltate) as a substance that can constitute a 4V-class secondary battery. Using LiCoO 2 When used as a positive electrode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 张新龙陈亮王梁梁刘奇朱祥
Owner NANTONG RESHINE NEW MATERIAL