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Modified lithium nickel cobalt manganese aluminate cathode material and a preparation method thereof

A technology of nickel-cobalt-manganese-aluminate lithium and positive electrode materials, which is applied in the field of preparation of modified nickel-cobalt manganese-aluminate lithium, can solve the problems such as cycle stability needs to be improved, achieve high-rate cycle performance, improve safety performance, increase The effect of specific surface area

Active Publication Date: 2019-01-22
PHENIX NEW ENERGY HUIZHOU CO LTD
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AI Technical Summary

Problems solved by technology

However, the high-rate charge-discharge performance of this material and the cycle stability at high charge cut-off voltage still need to be improved.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1) Prepare solution A and solution B with a total concentration of 2mol / L respectively, wherein the molar ratio of nickel to nickel, cobalt and manganese in solution A is 9:0.5:0.5, and nickel to nickel, cobalt and manganese in solution B The 5:3:2 of aluminum molar ratio, described nickel salt is nickel sulfate, and cobalt salt is cobalt sulfate, and manganese salt is manganese sulfate, and aluminum salt is aluminum sulfate;

[0036]2) Pump solution B into solution A at a constant speed and mix evenly by stirring. At the same time, add the mixed solution into the reaction kettle through the pump, and simultaneously add the precipitant and complexing agent solutions in parallel. In the reaction kettle, ensure that the pH value of the reaction solution is 12.0, the reaction temperature is 40°C, and the stirring speed is 1000r / min, and the dropping speed of solution A and solution B is controlled to ensure that the two can be added dropwise at the same time, and the alkali...

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Abstract

The invention provides odified lithium nickel cobalt manganese aluminate cathode material and a preparation method thereof. Compared with the prior art, the method for preparing ternary cathode materials by coprecipitation has the advantages of low cost, simple operation, safety, no pollution, and the like, and can be applied to large-scale production. Graphene and metal frame compound coat structure modification method is also a one-step process, that method is simple, and the modify cathode material has excellent rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a preparation method of modified nickel-cobalt-manganese-aluminate lithium and a lithium-ion battery. Background technique [0002] At present, fossil energy sources such as coal, oil, and natural gas are increasingly depleted. In addition, environmental pollution has gradually become a key issue of concern to all countries. The development of pure electric vehicles and gasoline-gas hybrid vehicles has attracted more and more attention. Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less white discharge, no memory effect and high cost performance, and have become rechargeable batteries in high-power electric vehicles, artificial satellites, aerospace and other fields The main selection object of the power supply. This requires the rapid development of lithium secondary batteries to meet peopl...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 王栋李继春赵莉李兰吴锋郑康宁颜国英
Owner PHENIX NEW ENERGY HUIZHOU CO LTD
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