Spherical nickel cobalt aluminum precursor and preparation method therefor

A spherical nickel-cobalt-aluminum precursor technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problem of affecting the electrochemical performance of nickel-cobalt-aluminum materials, unfavorable electrolyte full contact, and uneven primary particle morphology And other issues

Active Publication Date: 2018-03-13
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
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AI Technical Summary

Problems solved by technology

At present, the secondary particle morphology of ternary cathode materials (such as NCA, NCM) is mostly spherical, but the primary particle shape is not uniform. The specific surface area of ​​the morphology is small, which is not conducive to the full contact of the electrolyte, thus affecting the electrochemical performance of the nickel-cobalt-aluminum material

Method used

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  • Spherical nickel cobalt aluminum precursor and preparation method therefor
  • Spherical nickel cobalt aluminum precursor and preparation method therefor
  • Spherical nickel cobalt aluminum precursor and preparation method therefor

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[0024] The present invention also provides a method for preparing the spherical nickel-cobalt-aluminum precursor described in the above technical solution, comprising the following steps:

[0025] (1) Adding the nickel-cobalt salt mixed solution and the ammonium oxalate solution into water synchronously to obtain a spherical oxalate precursor solution, and adjusting the pH value of the reaction system to 8.0-8.5 with concentrated ammonia water;

[0026] (2) adding the aluminum salt solution and the strong alkali solution into the spherical oxalate precursor solution obtained in the step (1), and reacting to obtain a spherical nickel-cobalt-aluminum precursor.

[0027] The present invention preferably provides nickel-cobalt salt solution, aluminum salt solution, strong alkali solution and ammonium oxalate solution respectively. In the present invention, the total concentration of nickel-cobalt ions in the nickel-cobalt salt mixed solution is preferably 1.0-2.0 mol / L, more prefe...

Embodiment 1

[0061] Weigh nickel sulfate, cobalt sulfate, and aluminum nitrate crystals sequentially with a molar ratio of 81.5:15:3.5, and dissolve nickel sulfate and cobalt sulfate in deionized water to obtain a uniform nickel-cobalt salt mixed solution with a volume of 100ml. The concentration is 1M, aluminum nitrate crystals are dissolved in 20ml of deionized water to obtain a 0.0175M solution, and the molar ratio of ammonium oxalate to metal is 1:1, and ammonium oxalate crystals are weighed to prepare a 0.3M solution.

[0062]Measure 1.4L of deionized water into a 3L reaction vessel, then raise the reaction temperature to 60°C, and add 1M nickel and cobalt salt mixed solution and 0.3M ammonium oxalate solution in parallel under constant temperature and continuous stirring. The feeding speed was 0.5ml / min and 1.5ml / min in turn, and during the whole feeding process, the pH value of the system was maintained at 8.0 by using concentrated ammonia water.

[0063] After the ammonium oxalate ...

Embodiment 2

[0066] Weigh nickel sulfate, cobalt sulfate, and aluminum nitrate crystals sequentially with a molar ratio of 81.5:15:3.5, and dissolve nickel sulfate and cobalt sulfate in deionized water to obtain a uniform nickel and cobalt salt mixed solution with a volume of 50ml. The concentration of aluminum nitrate is 2M, aluminum nitrate crystals are dissolved in 20ml of deionized water to obtain a 0.0175M solution, and the molar ratio of ammonium oxalate to metal is 1:1, and ammonium oxalate crystals are weighed to prepare a 0.3M solution.

[0067] Measure 1L of deionized water into a 3L reaction vessel, then raise the temperature of the reaction conditions to 60°C, add 2M mixed solution of nickel and cobalt salts and 0.3M ammonium oxalate solution in parallel under constant temperature and continuous stirring conditions, and proceed The feeding speed was 1.0ml / min and 3.0ml / min in turn, and during the whole feeding process, the pH value of the system was maintained at 8.0 by using co...

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Abstract

The invention provides a spherical nickel cobalt aluminum precursor, and belongs to the field of a positive electrode material of a lithium ion battery. The spherical nickel cobalt aluminum precursoris formed by radially grown prisms and has a radial pattern spherical appearance; the spherical nickel cobalt aluminum precursor has the chemical components of [a(Ni<x>Co<y>C<2>O<4>)].bAl(OH)<3>, wherein x is greater than or equal to 0 and less than or equal to 1, y is greater than or equal to 0 and less than or equal to 1; a x is greater than 0 and less than or equal to 1; b x is greater than orequal to 0 and less than 1; a+b is equal to 1; the spherical nickel cobalt aluminum precursor is 8-50 [mu]m in grain diameter; and the prism main phase is nickel cobalt oxalate and the surface is loaded with aluminium hydroxide granules. The scanning electron microscope analysis proves that the spherical nickel cobalt aluminum precursor provided by the invention has the radial pattern spherical appearance and is formed by the radially grown prism, with uniform dimension and appearance distribution and regular and tidy spherical structure; and the specific capacity of a nickel cobalt aluminum positive electrode material prepared from the spherical nickel cobalt aluminum precursor provided by the invention can reach 160 mAh.g<-1> and has relatively high cycle performance.

Description

technical field [0001] The invention relates to the field of preparation of cathode materials for lithium ion batteries, in particular to a spherical nickel-cobalt-aluminum precursor and a preparation method thereof. Background technique [0002] In a diversified society, people's living standards and needs are gradually improving. Due to problems such as lack of resources and environmental pollution, traditional energy is gradually replaced by new energy. In new energy, lithium-ion batteries play an important role. Due to their small size and high energy density, they are widely used in mobile phones, computers and other electronic equipment, electric bicycles and electric vehicles. The performance of the lithium-ion battery is mainly determined by the positive electrode material and the negative electrode material. Compared with the negative electrode material, the capacity of the positive electrode material is relatively low, which becomes a bottleneck for further improvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M10/0525
CPCH01M4/36H01M4/52H01M10/0525Y02E60/10
Inventor 陈召勇曹凯峰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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