Synthesize particular structural material is an effective way to improve the performances of conversion mechanism materials for lithium ion batteries (LIBs), as there are inevitable huge volume expansion and severe concentration of granular material during the structure conversion process while Li+ insertion and extraction for charge-discharge, whi...
A cathode consisting of 2D homogeneous micro/mesoporous platelet carbon (MMPC) is synthesized in one step by regulated pyrolysis of metal-organic frameworks (MOF), which act as self-templates. The uniform micro/mesoporous structure is ascribed to metal sublimation in the Zn-based MOF during the pyrolysis process. The cathode exhibits an excellent c...
Published in Korean Journal of Chemical Engineering
A Ni0.9Co0.05Ti0.05(OH)2 precursor was synthesized with the concentration gradient method. To overcome the Li-ion shortage the problem due to the formation of a solid electrolyte interphase (SEI) layer during the initial charge/discharge process in the cathode material, lithium-excess Li1+xNi0.9Co0.05Ti0.05O2 (0≤x≤T0.07) cathode materials were inve...
Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(人間・環境学) / 甲第21876号 / 人博第905号 / 新制||人||216(附属図書館) / 2018||人博||905(吉田南総合図書館) / 京都大学大学院人間・環境学研究科相関環境学専攻 / (主査)教授 内本 喜晴, 教授 田部 勢津久, 教授 吉田 鉄平 / 学位規則第4条第1項該当
Published in Korean Journal of Chemical Engineering
A convenient one-pot method, called high-temperature high-energy mechanical force (HTHEMF), was successfully developed for the preparation of LiFePO4/C composites. Upon the combination of high-temperature with high-energy mechanical force, the whole synthesis process of this method is very simple and only involves two steps, the precursor preparati...
Vanadium oxy-acetylacetonate (VO(acac)(2)) was originally explored as an organic anode material for lithium-ion batteries (LIBs) with high capacity and rate performance. Specifically, the prepared VO(acac)(2) has delivered capacity of 620 mA h g(-1) at current density of 100 mA g(-1) with nearly 100% coulombic efficiency during cycling. Furthermore...
Due to its high theoretical capacity, energy density, and excellent reversibility with Li/Li+, molybdenum oxide is one of the vastly studied electrode material in lithium-ion batteries. However, like most of the oxides, it also suffers from poor cyclic stability because of its low electrical conductivity. In 3D core-shell structure prepared by atom...
Published in Journal of Materials Science
The variations in the structural and chemical features of LiNi0.6Co0.2Mn0.2O2 (LMO2: L = Li, M = Ni0.6Co0.2Mn0.2) materials were investigated via transmission electron microscopy. The LMO2 materials were used as a cathode material in a Li-battery operated at cutoff voltages of 4.15 and 4.45 V, and subjected to as many as 2200 charge–discharge cycle...
Published in Journal of Materials Science: Materials in Electronics
A novel VOxNTs-Polyaniline nanocomposite was prepared by hydrothermal treatment and a wet-chemistry method. When this VOxNTs-Polyaniline was used as cathode material for lithium ion batteries (LIBs), it displayed much higher specific capacity and better cycling stability compared with the pristine VOxNTs. The improvement of electrochemical performa...
Published in Metallurgical and Materials Transactions A
Boron-substituted LiCrO2 battery cathode material samples were investigated by X-ray-based techniques to probe the influence of boron on their crystal and electronic structure properties. Studies were carried on a series of Li-ion battery cathode materials with the general formula LiCr1−xBxO2. Up to 10 pct boron substitution amounts, light boron at...
