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Modified lithium nickel cobalt aluminate cathode material and preparation method and application thereof

A technology of nickel-cobalt lithium aluminate and positive electrode materials, which is applied in the field of lithium-ion batteries, can solve the problems of low surface residual Li, high surface residual Li, poor cycle stability and thermal stability, etc., so as to improve coating uniformity and prolong The effect of covering time and increasing capacity

Active Publication Date: 2020-05-19
BEIJING EASPRING MATERIAL TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a doped, coated and modified nickel-cobalt-aluminate in order to overcome the problems of poor cycle stability and thermal stability of high-nickel materials for batteries and high residual Li on the surface in the prior art. Lithium positive electrode material and its preparation method and application, the nickel cobalt lithium aluminate positive electrode material has high cycle rate performance and low surface residual Li, and the battery made from it has good cycle stability, thermal stability and safety performance

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  • Modified lithium nickel cobalt aluminate cathode material and preparation method and application thereof
  • Modified lithium nickel cobalt aluminate cathode material and preparation method and application thereof
  • Modified lithium nickel cobalt aluminate cathode material and preparation method and application thereof

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preparation example Construction

[0043] The second aspect of the present invention provides a method for preparing a modified nickel-cobalt lithium aluminate positive electrode material, wherein the method includes the following steps:

[0044] (1) Nickel salt, cobalt salt and optional aluminum salt are configured as a mixed salt solution in a molar ratio x:y:z; a compound containing a doping element M, an alkali and a complexing agent are respectively configured as a solution; The mixed salt solution, lye, complexing agent solution, and compound solution containing the doping element M are respectively passed into the reaction kettle to perform the first reaction, and the obtained slurry is separated, washed, dried and screened to obtain the positive electrode material Precursor;

[0045] (2) Mix the positive electrode material precursor obtained in step (1), the lithium source, the compound containing the doping element G and an optional aluminum compound, and in an oxygen atmosphere, carry out the first si...

Embodiment 1

[0136] S1, nickel sulfate, cobalt sulfate are dissolved to obtain 2mol / L mixed salt solution according to the ratio of metal molar ratio 0.95:0.05, magnesium nitrate is dissolved into the magnesium nitrate solution that concentration is 0.1mol / L, calcium nitrate is dissolved into concentration 0.1mol / L calcium nitrate solution, dissolve sodium hydroxide into an alkali solution with a concentration of 8mol / L, and dissolve ammonia water into a complexing agent solution with a concentration of 6mol / L.

[0137]S2. Add the mixed salt solution, magnesium nitrate solution, calcium nitrate solution, alkali solution, and complexing agent solution together into the reactor for reaction. The mixed salt solution inlet flow rate is 400mL / h. The solution inlet flow rate is 16mL / h, the reaction pH is controlled to be 11.5-11.7, the reaction temperature is 60°C, and the concentration of ammonia in the reaction system is controlled to be 8-11g / L. The temperature and stirring speed remain uncha...

Embodiment 2

[0143] Prepare the positive electrode material according to the same method as in Example 1, except that in the S1 step, nickel sulfate, cobalt sulfate, and aluminum sulfate are dissolved according to the metal molar ratio of 0.92:0.05:0.03 to obtain a 2mol / L mixed salt solution, and finally to get spherical Ni 0.9163 co 0.0498 al 0.0299 Mg 0.0020 Ca 0.0020 Oxide precursor.

[0144] In the S3 step lithium hydroxide and Ni 0.9163 co 0.0498 al 0.0299 Mg 0.0020 Ca 0.0020 The O precursor was mixed uniformly in a high mixer according to the molar ratio of 1.05:1, and finally Li 1.05 Ni 0.9163 co 0.0498 al 0.0299 Mg 0.0020 Ca 0.0020 o 2 .

[0145] Other steps are consistent with embodiment 1, finally obtain positive electrode material A2: Li 1.035 Ni 0.9027 co 0.0589 al 0.029 4 m n0.0049 Mg 0.0020 Ca 0.0020 o 2 .

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a modified lithium nickel cobalt aluminate cathode material and a preparation method and application thereof. The cathode material has a composition as shown in a general formula I which is described in the specification, li1+[alpha]NixCoyAlzMdGePf2, wherein 0<=[alpha]<=0.1, 0.80<=x<=0.99, 0.01<=y<=0.20, 0.01<=z<=0.06, 0<=d<=0.005, 0<=e<=0.004, 0<=f<=0.04, and M is selected from at least one of Ca, Sr, Ba, Zr, Y, Ce, Mg, Ti and Mn, G is selected from at least one of Ca, Sr, Ba, Zr, Y, La, Ce, Mg, Ti, B and W,P is selected from at least one of Ni, Co, Al, Nb, W and Mn, and d, e and f are not zero at the same time. The cathode material has the high cycle rate performance and low surface residual Li, and thebattery prepared from the cathode material has good cycle stability, thermal stability and safety performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a modified nickel-cobalt-lithium-aluminate cathode material and a preparation method and application thereof. Background technique [0002] Lithium-ion battery is a kind of green and recyclable energy, which has the advantages of high voltage, high energy density, good cycle performance, high safety, low self-discharge, no memory effect, etc. It is widely used in 3C electronic equipment, space power supply, portable electric At the same time, lithium-ion batteries have also been widely used in energy storage equipment, electric vehicles, electric buses and other fields. [0003] In recent years, with the rapid rise and promotion of Tesla electric vehicles, various brands of electric vehicles have begun to partially replace fuel vehicles. my country's 2016~2020 plan proposes that the energy density of lithium-ion batteries for vehicles must reach 300Wh / kg. Japan, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/42H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/624H01M4/628H01M10/0525H01M10/4235Y02E60/10
Inventor 王亚奇李文慧张航张民张学全刘亚飞陈彦彬关志波
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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