title: Comparison of nanorod-structured Li[Ni0.54 Co0.16 Mn0.30 ]O2 with conventional cathode materials for Li-ion batteries.
abstract: We successfully synthesized a safe, high-capacity cathode material specifically engineered for EV applications with a full concentration gradient (FCG) of Ni and Co ions at a fixed Mn content throughout the particles. The electrochemical and thermal properties of the FCG Li[Ni(0.54)Co(0.16)Mn(0.30)]O2 were evaluated and compared to those of conventional Li[Ni(0.5) Co(0.2) Mn(0.3)]O2 and Li[Ni(1/3)Co(1/3)Mn(1/3)]O2 materials. It was found that the FCG Li[Ni(0.54)Co(0.16)Mn(0.30)]O2 demonstrated a higher discharge capacity and a superior lithium intercalation stability compared to Li[Ni(0.5) Co(0.2)Mn(0.3)]O2 and Li[Ni(1/3)Co(1/3)Mn(1/3)]O2 over all of the tested voltage ranges. The results of electrochemical impedance spectroscopy and transition-metal dissolution demonstrate that the microstructure of primary particle with rod-shaped morphology plays an important role in reducing metal dissolution, which thereby decreases the charge transfer resistance as a result of stabilization of the host structure.
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul 133-791 (South Korea).
authors.forename: Hyung-Joo
authors.initials: HJ
authors.lastname: Noh
authors.forename: Jin Wook
authors.initials: JW
authors.lastname: Ju
authors.forename: Yang-Kook
authors.initials: YK
authors.lastname: Sun
mesh_terms: D002152:Calorimetry, Differential Scanning; D011211:Electric Power Supplies; D004563:Electrochemistry; D004566:Electrodes; D007477:Ions; D019216:Metals, Heavy / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*
chemical_list: D007477:Ions; D019216:Metals, Heavy; D010087:Oxides
keywords: cathode materials; electrochemistry; full concentration gradient; lithium; nanostructures