CAJ | 학술논문

以Nb和Nb2O5粉末为原料，采用高温固相还原法合成NbO电极材料。通过X射线衍射分析(XRD)、扫描电镜(SEM)、激光衍射粒度分析(LDSA)、充放电测试、循环伏安(CV)测试等手段对材料的结构、形貌及电化学性能进行表征，并通过原位XRD分析测试，探究NbO作为负极材料在锂离子电池中的反应机理。结果表明：NbO用作电极材料的平均嵌锂平台在1.6 V 左右。NbO 对锂的插嵌机理为锂离子的直接脱嵌，是1个单相转变过程。在0.05 C(C 为充放电电流倍率)下，NbO 和球磨处理后(Ball-milling)的 NbO-BM 的首次放电容量分别为220(mA·h)/g和280(mA·h)/g，经过50次循环后，剩余容量分别为170(mA·h)/g和220(mA·h)/g
이Nb화Nb2O5분말위원료，채용고온고상환원법합성NbO전겁재료。통과X사선연사분석(XRD)、소묘전경(SEM)、격광연사립도분석(LDSA)、충방전측시、순배복안(CV)측시등수단대재료적결구、형모급전화학성능진행표정，병통과원위XRD분석측시，탐구NbO작위부겁재료재리리자전지중적반응궤리。결과표명：NbO용작전겁재료적평균감리평태재1.6 V 좌우。NbO 대리적삽감궤리위리리자적직접탈감，시1개단상전변과정。재0.05 C(C 위충방전전류배솔)하，NbO 화구마처리후(Ball-milling)적 NbO-BM 적수차방전용량분별위220(mA·h)/g화280(mA·h)/g，경과50차순배후，잉여용량분별위170(mA·h)/g화220(mA·h)/g
The NbO electrode materials were successfully synthesized by high temperature solid phase method using Nb and Nb2O5 powder as raw materials. The crystalline structure, morphology and electrochemical properties of the obtained materials were characterized by XRD, SEM, LPSA, half cell charge-discharge tests and cyclic voltammetry. The reaction mechanism of lithium with NbO was investigated by in situ XRD studies. The results show that the average Li storage voltage of the NbO electrode material is nearly located at 1.6 V and the lithium intercalating into NbO remains a single-phase process. For the first discharge, a capacity of 220 (mA·h)/g for NbO and 280 (mA·h)/g for NbO-BM are obtained at a current of 0.05 C, and 170 (mA·h)/g for NbO and 220 (mA·h)/g for NbO-BM are maintained respectively after 50 cycles.