Nickel cobalt lithium manganate positive electrode material and preparation method therefor

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the field of positive electrode materials and its preparation, can solve the problems of difficult uniform mixing, low stability of structure, composition, electrochemical performance, and slow solid phase diffusion speed, etc., and achieve excellent The effect of rate and cycle performance, good crystallization and uniform distribution

Active Publication Date: 2016-03-23
GUANGDONG BRUNP RECYCLING TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference between the physical properties of the lithium source and the physical properties of the nickel-cobalt-manganese hydroxide, it is difficult to mix uniformly, and the solid phase diffusion rate is slow, so there are large differences in the structure and composition of the product, which leads to its electrochemical performance. low stability

Method used

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  • Nickel cobalt lithium manganate positive electrode material and preparation method therefor
  • Nickel cobalt lithium manganate positive electrode material and preparation method therefor
  • Nickel cobalt lithium manganate positive electrode material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Prepare nickel cobalt lithium manganese oxide cathode material according to the following steps:

[0035] (1) Weigh 2kg of nickel-cobalt-manganese hydroxide, 1.1kg of lithium hydroxide monohydrate, and 3kg of deionized water into a 10L autoclave;

[0036] (2) Turn on the stirring, keep the stirring speed at 60 rpm, and the reaction temperature is 50°C, at 10m 3 Ozone with a concentration of 60mg / L is introduced at a flow rate of / h to cause the nickel-cobalt-manganese hydroxide to undergo an oxidation reaction, and the reaction time is 2h;

[0037] (3) Raise the reaction temperature of the autoclave to 200°C, control the pressure inside the autoclave at 3.0MPa, react for 1h, and form nickel-cobalt-lithium manganate precipitate, and cool to 40-50°C;

[0038] (4) Pour the nickel-cobalt-lithium-manganese oxide precipitate into a centrifuge for filtration, put the filtered material into a muffle furnace for sintering, the sintering temperature is 800°C, the sintering time ...

Embodiment 2

[0048] Prepare nickel cobalt lithium manganese oxide cathode material according to the following steps:

[0049] (1) Weigh 2kg of nickel-cobalt-manganese hydroxide, 1.1kg of lithium hydroxide monohydrate, and 3kg of deionized water into a 10L autoclave;

[0050] (2) Turn on the stirring, keep the stirring speed at 60 rpm, and the reaction temperature is 50°C, at 10m 3 Ozone with a concentration of 80mg / L is introduced at a flow rate of / h to make the nickel-cobalt-manganese hydroxide oxidize, and the reaction time is 2h;

[0051] (3) Raise the reaction temperature of the autoclave to 250 °C, control the pressure inside the autoclave at 5.0 MPa, react for 1 hour, and form nickel-cobalt lithium manganate precipitate, and cool to 40-50 °C;

[0052] (4) Pour the nickel-cobalt-lithium-manganese-oxide precipitation into a centrifuge to filter, put the filtered material into a muffle furnace for sintering, the sintering temperature is 850°C, the sintering time is 8h, and the sintere...

Embodiment 3

[0076] Prepare nickel cobalt lithium manganese oxide cathode material according to the following steps:

[0077] (1) Weigh 2kg of nickel-cobalt-manganese hydroxide, 0.5kg of lithium hydroxide monohydrate, and 2kg of deionized water into a 10L autoclave;

[0078] (2) Turn on the stirring, keep the stirring speed at 60 rpm, and the reaction temperature is 40°C, 3 Ozone with a concentration of 100mg / L is introduced at a flow rate of / h to cause the nickel-cobalt-manganese hydroxide to undergo an oxidation reaction, and the reaction time is 10h;

[0079] (3) Raise the reaction temperature of the autoclave to 150°C, control the pressure inside the autoclave at 0.2MPa, react for 5h, and form nickel-cobalt-lithium-manganate precipitate, and cool to 40-50°C;

[0080] (4) Pour the nickel-cobalt-lithium-manganese-oxide precipitate into a centrifuge for filtration, put the filtered material into a muffle furnace for sintering, the sintering temperature is 600°C, the sintering time is 15...

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Abstract

The invention discloses a nickel cobalt lithium manganate positive electrode material and a preparation method therefor. The preparation method specifically comprises: adding nickel cobalt manganese hydroxide, a lithium source and water into a reaction kettle; introducing ozone; performing heating for enabling ozone to produce an oxidation reaction; then performing heating and pressurization; performing a reaction to generate nickel cobalt lithium manganate deposits; and performing filtering, sintering and screening to obtain nickel cobalt lithium manganate. According to the preparation method, the nickel cobalt lithium manganate positive electrode material is synthesized with a hydrothermal method, nickel cobalt manganese hydroxide is taken as a raw material, and nickel, cobalt and manganese have been uniformly distributed before reaction and can be uniformly mixed with the lithium source; and with the ozone oxidation process, lithium can be quickly fused with nickel, cobalt and manganese, so that the product performance is improved. The nickel cobalt lithium manganate synthesized with the method has perfecter crystal shape and is moderate in particle size distribution and good in crystallization; and a produced battery has excellent rate and cycle performances, is high in capacity, and has wide market prospects in the field of new energy vehicles.

Description

technical field [0001] The invention relates to a positive electrode material and a preparation method thereof, in particular to a nickel cobalt lithium manganese oxide positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a kind of secondary battery, which mainly relies on the movement of lithium ions between the positive and negative electrodes to work; lithium-ion batteries have the advantages of high energy density, high discharge platform, long cycle life, and no memory effect, and have been widely used Used in mobile phones, cameras, notebook computers, power tools, electric vehicles and other fields. [0003] At present, lithium-ion batteries mainly have three structures of positive electrode materials, which are olivine structure, spinel structure and layered structure. Lithium cobalt oxide, lithium nickel oxide, lithium nickel cobalt oxide, and lithium nickel cobalt manganese oxide with a layered structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘更好李长东周汉章陆全寿黄春山
Owner GUANGDONG BRUNP RECYCLING TECH
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