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Modified nickel-cobalt lithium aluminate positive electrode material and preparation method thereof

A technology of lithium nickel cobalt aluminate and positive electrode materials, which is applied to battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor electrical properties of products, poor uniformity of electrical properties of products, and numerous processes, etc., and achieve reduction The degree of mixing and the effect of improving electrochemical performance

Active Publication Date: 2014-08-06
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, coprecipitation requires a long preparation cycle, numerous procedures, and poor uniformity of electrical properties of the product; although the solid-phase method is simple in process operation, the contact area between solid reactants is much smaller than its specific surface area, and it is difficult to control the uniformity of element distribution. and shape uniformity, the electrical properties of the product deteriorate

Method used

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  • Modified nickel-cobalt lithium aluminate positive electrode material and preparation method thereof
  • Modified nickel-cobalt lithium aluminate positive electrode material and preparation method thereof
  • Modified nickel-cobalt lithium aluminate positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Prepare a mixed aqueous solution of nickel nitrate, cobalt nitrate and aluminum nitrate nonahydrate with a total metal concentration of 1mol / L at a molar ratio of Ni:Co:Al of 0.8:0.15:0.05; prepare a mixture of NaOH and ammonia water with a total concentration of 10mol / L Solution, wherein the molar ratio of NaOH and ammonia water is 1:1.

[0033] Add the above two solutions into the reactor at a certain speed at the same time, control the pH value of the reaction to 12, and the reaction temperature to 50°C, react for 6 hours and then age for 8 hours. After filtering, washing and drying, nickel-cobalt lithium aluminate is obtained. Cathode material precursor.

[0034] The above nickel-cobalt-lithium-aluminate cathode material precursor was calcined at 500° C. for 5 hours in an oxygen atmosphere.

[0035] After the above-mentioned roasted nickel-cobalt-lithium-aluminate cathode material precursor and lithium carbonate are uniformly mixed according to the ratio of Li:(Ni+...

Embodiment 2

[0039] Prepare a mixed aqueous solution of nickel nitrate, cobalt nitrate and aluminum nitrate nonahydrate with a total metal concentration of 1mol / L at a molar ratio of Ni:Co:Al of 0.7:0.2:0.1; prepare a mixture of NaOH and ammonia water with a total concentration of 10mol / L Solution, wherein the molar ratio of NaOH and ammonia water is 1:1.

[0040] Add the above two solutions into the reactor at a certain speed at the same time, control the pH value of the reaction to 12, and the reaction temperature to 50°C, react for 6 hours and then age for 8 hours. After filtering, washing and drying, nickel-cobalt lithium aluminate is obtained. Cathode material precursor.

[0041] The above nickel-cobalt-lithium-aluminate cathode material precursor was calcined at 500° C. for 5 hours in an oxygen atmosphere.

[0042] After the above-mentioned roasted nickel-cobalt-lithium-aluminate cathode material precursor and lithium carbonate are uniformly mixed according to the ratio of Li:(Ni+Co...

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Abstract

The invention relates to a modified nickel-cobalt lithium aluminate positive electrode material and a preparation method of the material. The chemical general formula of the material is LiNi(1-a-b)CoaAlbO2 / TiO2, wherein a is greater than 0.1 and less than 0.3; b is greater than 0.01 and less than 0.2; 1-a-b is greater than 0 and less than 1; the TiO2 layer is a coating layer; the preparation method of the material comprises the following steps: preparing soluble metal nickel salt, cobalt salt and aluminium salt into a mixed salt solution, preparing the mixed salt solution, NaOH and ammonia water into a mixed alkali solution for reacting, filtering, washing, drying and then roasting the mixed alkali solution for 5-10 hours at the temperature of 400-600 DEG C in the oxygen atmosphere, then carrying out ball milling and uniformly mixing with lithium salt, roasting the mixed alkali solution for 6-16 hours at the high temperature of 800-1000 DEG C in the oxygen atmosphere, coating the mixed alkali solution by titanium dioxide to prepare the modified nickel-cobalt lithium aluminate positive electrode material. The prepared modified ternary positive electrode material of the lithium ion battery is good in electrochemical performance; the dry coating process is free of waste liquid and high-temperature sintering, so that the energy consumption and the cost are reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode materials, in particular to a modified nickel-cobalt lithium aluminate cathode material and a preparation method thereof. Background technique [0002] Compared with other traditional secondary batteries, the new green high-energy lithium-ion battery has many advantages such as good voltage platform, good cycle performance, large specific capacity and high energy density, so it is widely used in 3C electronic products. The cathode material is an important part of lithium-ion batteries, and it is also a bottleneck restricting the development of lithium-ion batteries. It determines the performance, cost and development of lithium-ion batteries. Therefore, the development of high-performance cathode materials is imminent. [0003] In recent years, nickel-cobalt-lithium manganese oxide ternary materials have developed rapidly. Due to the synergistic effect of nickel-cobalt-manganes...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCY02E60/122H01M4/366H01M4/525H01M10/0525Y02E60/10
Inventor 毛玉琴韩珽
Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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