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Lithium ion battery cathode material, preparation method and lithium ion battery

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of easily broken material particles, long production process, particle breakage, etc., to achieve uniform distribution of elements and improve storage performance. Effect

Active Publication Date: 2018-03-20
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the common industrial co-precipitation method or controlled crystallization method can prepare LiNi x co y mn 1-x-y o 2 However, the production process of this type of method is long, the production cycle is long, and the cost is high, and the precursor and sintered body are generally formed into regular spherical or spherical polycrystalline polymers, and such material particles are easily broken , when the material is used in the positive electrode of lithium-ion batteries, it is easy to break up the particles during long-term cycle use or charge storage

Method used

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  • Lithium ion battery cathode material, preparation method and lithium ion battery
  • Lithium ion battery cathode material, preparation method and lithium ion battery
  • Lithium ion battery cathode material, preparation method and lithium ion battery

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preparation example Construction

[0035] The present invention provides a kind of preparation method of lithium ion battery cathode material, comprises the following steps:

[0036] (1) Dissolving nickel salt, cobalt salt and manganese salt in a solvent to make solution A;

[0037] (2) Add the precipitant to solution A to obtain solution B;

[0038] (3) Transfer solution B to a reaction kettle for autoclave crystallization at a temperature ranging from 70 to 240°C to obtain a co-precipitate;

[0039] (4) Separating the co-precipitate from solid to liquid to obtain the precursor;

[0040] (5) Mix the precursor with the lithium salt and perform a solid-state reaction to obtain a lithium-ion battery cathode material containing nickel, cobalt, and manganese.

[0041] The invention provides a medium-temperature pressure-cooking crystal preparation method at 70-240°C, which is beneficial to the formation and control of special morphology. At the same time, the reaction system is carried out in a closed reaction k...

Embodiment 1

[0071] Add 6mmol of nickel acetate, 2mmol of cobalt acetate, and 2mmol of manganese acetate into a mixture of 30ml of deionized water and 70ml of ethylene glycol in the ratio of Ni:Co:Mn=0.6:0.2:0.2 and stir to dissolve, and then add 2mmol of PEG400 , to obtain solution A. At room temperature, add 10 mmol dimethyl oxalate to solution A while stirring, and then add 1 g of PVP to dissolve completely to obtain solution B. Solution B was transferred to the reactor, the reaction temperature was 200°C, the reaction pressure was 3MPa, and the reaction time was 24h. After cooling down naturally, the reaction product was suction filtered and washed with deionized water and ethanol respectively. The filtered product was dried in vacuum at 80° C. to obtain an oxalate precursor. The above-mentioned oxalate precursor is placed in a muffle furnace and heated to 500° C. for pre-calcination to obtain an oxide precursor. The oxide precursor and lithium carbonate were fully mixed in a molar r...

Embodiment 2

[0073] Add 6.8mmol of nickel acetate, 1.5mmol of cobalt acetate, and 1.7mmol of manganese acetate into a mixture of 30ml of deionized water and 70ml of ethylene glycol in the ratio of Ni:Co:Mn=0.68:0.15:0.17 and stir to dissolve. 1.5 mmol of PEG400 to obtain solution A. At room temperature, add 10 mmol dimethyl oxalate to solution A while stirring, and obtain solution B after complete dissolution. Solution B is transferred in the reactor, and reaction temperature is 180 ℃, and reaction pressure is 6MPa, and reaction time is 12h, and after natural cooling, reaction product is sucked and washed with deionized water and ethanol respectively. The filtered product was dried in vacuum at 80° C. to obtain an oxalate precursor. The above-mentioned dried product was placed in a muffle furnace and the temperature was raised to 500° C. for pre-calcination to obtain an oxide precursor. The oxide precursor and lithium hydroxide were fully mixed in a molar ratio of 1:1.02, solid-state sin...

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Abstract

The invention provides a preparation method of a lithium ion battery cathode material. The prepared lithium ion battery cathode material has good pseudo-single crystal form by utilizing pressure-boiling crystal at certain temperature. The preparation method is simple in technology and easy in control. The general formula of the lithium ion battery cathode material prepared by the preparation method is expressed as Li (NixCo1-x-yMny) O2, wherein x is more than or equal to 0.34 and is less than or equal to 0.68, y is more than or equal to 0.15 and is less than or equal to 0.31, x +y is more than 0 and is less than 1. The invention also provides a lithium ion battery containing the lithium ion battery cathode material.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion batteries, in particular to a preparation method of a cathode material of a lithium ion battery, an anode material and a lithium ion battery. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental protection. They are currently the secondary chemical power sources with the best comprehensive performance. In recent years, the application fields of lithium-ion batteries have become more and more extensive. With the development of electric vehicles (EV) and hybrid electric vehicles (HEV), high specific energy and high power have become an important direction for the research and development of lithium-ion batteries in the future. As a key part of lithium-ion batteries, the research and development of cathode materials is particularly urgent. [0003] Since Ohzu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/505H01M4/525H01M10/0525
CPCH01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 魏国祯杨金洪郑超
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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