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Preparation and electrochemical performance of Li-Ni-Co-Mn-O cathode material for lithium-ion batteries

Author: NiYing
Tutor: LiZhouPeng
School: Zhejiang University
Course: Chemical Engineering
Keywords: Lithium ion batteries Cathode materials Li-Ni-Co-Mn-O materials Electrochemical performance
CLC: TM912
Type: Master's thesis
Year: 2014
Downloads: 13
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Abstract


Rechargeable lithium-ion batteries (LIBs) are the most important power sources for the increasing demand from the removable electronic products, such as electrical tools, electrical vehicles (EV) and hybrid electrical vehicles (HEV). Researches on the new cathode matetials with low cost and high capacity are the most important developing trend in lithium batteries. As a new generation cathode materials, Li-Ni-Co-Mn-O cathode material has great potential application for being candidate for its excellent electrochemical performance, safety and low cost.In this thesis, three parts work are described as follow:(1) The precursor of Li-Ni-Co-Mn-O samples was synthesized by co-precipitation method with LiOH+NH3·H2O, NaOH+NH3·H2O, and (NH4)2C2O4+NH3·H2O as precitant, respectively. The temperature-controlled furnace was used for the final sintering. The structure and morphologies of the samples were studied by X-ray diffraction patterns (XRD), scanning and transimission electron microscope (SEM and TEM), etc. The electrochemical performance was studied with CV, EIS and cell test. The results showed that the sample synthesized by microwave method at900℃for7min presented the good lattice structure and the best electrochemical performance. By using LiOH+NH3·H2O as precipitant, the sample as-synthesized by hydrothermal for4days at180℃presents the best electrochemical performance, for example, delivered192.6mAh/g at0.1C rate between2.4V and4.4V. The composite material of xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2with various ratio x are synthesized by hydrothermal method. The composite with x=0.6synthesized at180℃for2days presents poor initial discharge capacity but provides the improved cycle performance. The crystal structure and electrochemical performance of the composite material xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2depends on the hydrothermal conditions, the subsequent sintering conditions.(2) LiNi1/3Co1/3Mn1/3O2as cathode material for LIBs was synthesized by traditional high-temperature sintering method after the precursor was prepared by coprecipitation of oxalate. The cycle performance and rate performance are improved after LiNi1/3Co1/3Mn1/3O2are surface modification with the fast-ion conductor of Li7La3Zr2O12.(3) By using transition metal acetate and lithium acetate as reactants and citric acid as chelating agent, the precursor of Li1.23Mn0.56Ni0.12Co0.06O2was synthesized by sol-gel method. A series of Li1.23Mno.56Nio.12Coo.06O2sampes are synthesized under various microwave-sintering conditions. Li1.23Mno.56Nio.12Coo.06O2rapidly synthesized for5min in microwave oven present homogeneous particle size distribution, showed the best electrochemical performance,251.5mAh/g at the1st cycle and215mAh/g at20th cycle at the current density of17mA/g.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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