Ni-rich layered oxides for lithium-ion batteries are the most promising cathode material for use in electric vehicles (EVs) among layered-structured ternary cathode materials due to its prominent energy density over 200 mAh g-1and low cost. However, there are several issues, which are needed to overcome; Ni/Li cation mixing, gas evolutions during cycling from unreacted lithium source on the surface of the active material. Herein, a simple and novel approach for post treatment using a type of metal-organic framework (MOF), which has been known to be easily synthesizable and mass producible was applied. The MOF was introduced for the Ni-rich layered oxides having Ni contents over 80% among the transition metals of Li(NiCoMn)O2(NCM). As a result, considerable morphology and phase changes of the active materials were derived by the post treatment. The introduction of the MOF to the active materials is effectively influenced on the structure of the outer and inner primary particles on a molecular level. In addition, electrochemical performances and thermal stability are improved by this effective modification. The treated samples were characterized by surface analyses (X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy), thermal analyses (thermogravimetric analysis(TGA), differential scanning calorimetry) and electrochemical methods (AC impedance, half- and full-cell test).

Simple method for molecular level modification of Ni-rich layered oxide cathode for lithium-ion batteries using metal-organic frameworks

256th National Meeting (2018)

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