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Aluminum oxide coated nickel-cobalt-manganese ternary positive electrode material, preparation method and application thereof

A positive electrode material and ternary material technology, which is applied in the field of alumina-coated nickel-cobalt-manganese ternary positive electrode materials and its preparation, can solve the problems of uneven surface reaction, poor thermal stability, and increased residual alkali on the surface. Good cycle performance and safety performance, preventing dissolution and reducing the effect of residual alkali

Inactive Publication Date: 2019-04-05
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Li[Ni,Co,Mn]O 2 The series of materials are referred to as ternary materials, which combine LiCoO 2 Good cycle performance, LiNiO 2 The high specific capacity and LiMnO 2 With its high safety performance and low cost, it has become the successor to LiFePO 4 and LiCoO 2 Another mainstream positive electrode material; at present, with the continuous improvement of new energy vehicles' requirements for battery energy density, high-nickel ternary materials have become a research hotspot, but with the increase of nickel content, a series of problems will also occur, such as : Poor cycle performance, increased residual alkali on the surface, poor thermal stability, uneven surface reaction, etc., hindering its application in power batteries

Method used

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  • Aluminum oxide coated nickel-cobalt-manganese ternary positive electrode material, preparation method and application thereof
  • Aluminum oxide coated nickel-cobalt-manganese ternary positive electrode material, preparation method and application thereof
  • Aluminum oxide coated nickel-cobalt-manganese ternary positive electrode material, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] (1) Add 1mol / L ammonia water to the container, place it in a water bath at 80°C for continuous heating and stirring, then slowly drop in 0.2mol / L aluminum nitrate solution to make the precipitate slowly form; react until the precipitate does not increase, Then add citric acid and 0.5mol / L nitric acid solution to it to slowly hydrolyze and peptize the precipitate, and continue to stir and age for 10-20h to obtain a clear AlOOH sol;

[0036] (2) Mix the precursor Ni with a molar ratio of 1:1.06 0.6 co 0.2 mn 0.2 (OH) 2 and battery-grade LiOH·H 2 O mixed together and ball milled, placed in an alumina ceramic crucible after mixing evenly, and sintered under the condition of compressed air, wherein the gas flow rate of sintering is 0.5-1.5L / min, and the heating rate of sintering is 5℃ / min, first keep it at 525°C for 3.5h, then raise the temperature to 840°C for 13h, and get black nickel-cobalt-manganese ternary material after calcination;

[0037] (3) Put the nickel-co...

Embodiment 2

[0040] (1) Add 1mol / L ammonia water to the container, place it in a water bath at 80°C for continuous heating and stirring, then slowly drop in 0.2mol / L aluminum nitrate solution to make the precipitate slowly form; react until the precipitate does not increase, Then add citric acid and 0.5mol / L nitric acid solution to it to slowly hydrolyze and peptize the precipitate, and continue to stir and age for 10-20h to obtain a clear AlOOH sol;

[0041] (2) Mix the precursor Ni with a molar ratio of 1:1.06 0.6 co 0.2 mn 0.2(OH) 2 and battery-grade LiOH·H 2 O are mixed together and ball milled, and placed in an alumina ceramic crucible after mixing evenly, and sintered at a high temperature under the condition of compressed air, wherein the sintering gas flow rate is 0.5-1.5L / min, and the sintering heating rate is 5°C / min, first hold at 525°C for 3.5h, then raise the temperature to 840°C for 13h, and obtain a black nickel-cobalt-manganese ternary material (referred to as uncoated...

Embodiment 3

[0045] A lithium-ion battery, comprising a housing and a positive pole placed in the housing, a negative pole, a diaphragm and an electrolyte, the diaphragm is located between the positive pole and the negative pole, the diaphragm is a glue-coated ceramic diaphragm, and the negative pole is artificial graphite, using 1.0mol / LiPF of L 6 The electrolytic solution of / EC+EMC+DEC (EC, EMC and DEC volume ratio is 3:5:2), and shell is square aluminum shell, and wherein positive pole is the coating material that embodiment 2 prepares. In order to compare the excellent performance of the coating material prepared by the method of the present invention when applied to the battery, another lithium ion battery was prepared, which had the same composition as the above battery, but with the uncoated material as the positive electrode. The high temperature expansion rate and normal temperature cycle performance of the above two batteries were detected, and the results were as follows: im...

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Abstract

The invention discloses an aluminum oxide coated nickel-cobalt-manganese ternary positive electrode material, a preparation method and application thereof. The preparation method of the material comprises the following steps: (1) dripping aluminum nitrate into ammonium hydroxide, reacting until precipitates are not increased any longer, adding citric acid and nitric acid, and preparing an AlOOH sol; (2) mixing a nickel-cobalt-manganese precursor and a lithium source uniformly, and sintering to obtain a nickel-cobalt-manganese ternary material; and (3) putting the nickel-cobalt-manganese ternary material into the AlOOH sol, carrying out calcinations after drying, and finally obtaining the aluminum oxide coated nickel-cobalt-manganese ternary positive electrode material. An aluminum oxide coating layer is coated on the surface of the nickel-cobalt-manganese ternary material, so that the amount of residual alkali on the surface of the material is reduced, a side reaction between the material and an electrolyte is inhibited effectively, and the safety performance of a battery is improved; moreover, in the battery prepared from the material, an Li-Al-Co-O protective layer is formed by the aluminum oxide coating layer during working on the surface of the material, and the protective layer can resist the corrosion of HF on active materials, so that the cycle performance of the batteryis improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to an aluminum oxide-coated nickel-cobalt-manganese ternary positive electrode material and a preparation method and application thereof. Background technique [0002] With the aggravation of environmental pollution and the gradual consumption of fossil energy, the search for green and environmentally friendly new energy has become the main problem facing all countries; compared with traditional lead-acid batteries, nickel-cadmium batteries and nickel-hydrogen batteries, lithium-ion batteries have high energy density. , long cycle life, high charging and discharging voltage, green environmental protection, no memory and other advantages, it has been developed rapidly since its birth in the 1980s. At present, the battery is not only widely used in 3C and other electronic products, but also has become a The first choice for new energy vehicle power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张阳阳高二平樊少娟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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