A1N/Co nanocomposite thin films were fabricated by pulsed laser deposition and investigated as new anode materials for lithium-ion batteries for the first time. The combination of electrochemically inactive A1N and Co...A1N/Co nanocomposite thin films were fabricated by pulsed laser deposition and investigated as new anode materials for lithium-ion batteries for the first time. The combination of electrochemically inactive A1N and Co in nanometer scale boosted the electrochemical performance of the thin films surprisingly. A high reversible capacity of 555 mAh.g^-1 after 100 discharge-charge cycles at a current density of 500 mA.g^-1 is obtained for the A1N/Co nanocomposite thin films, and 372 mAh.g^-1 can be retained at a high rate up to 16C, exhibiting promising cycle stability and rate capability. The electrochemical reaction mechanism study reveals that Co nanoparticles could not only provide high electronic conductivity for the thin films, which facilitate the thorough decomposition of A1N in the initial discharge process, but also react with Li3N to form a new species CozN during charge process, thus ensuring large capacity and high reversibility of A1N/Co nanocomposite thin films in sub- sequent cycles. This study provides a new perspective to design advanced electrode materials for lithium-ion batteries.展开更多
基金financially supported by the National Natural Science Foundation of China (No.51502039)
文摘A1N/Co nanocomposite thin films were fabricated by pulsed laser deposition and investigated as new anode materials for lithium-ion batteries for the first time. The combination of electrochemically inactive A1N and Co in nanometer scale boosted the electrochemical performance of the thin films surprisingly. A high reversible capacity of 555 mAh.g^-1 after 100 discharge-charge cycles at a current density of 500 mA.g^-1 is obtained for the A1N/Co nanocomposite thin films, and 372 mAh.g^-1 can be retained at a high rate up to 16C, exhibiting promising cycle stability and rate capability. The electrochemical reaction mechanism study reveals that Co nanoparticles could not only provide high electronic conductivity for the thin films, which facilitate the thorough decomposition of A1N in the initial discharge process, but also react with Li3N to form a new species CozN during charge process, thus ensuring large capacity and high reversibility of A1N/Co nanocomposite thin films in sub- sequent cycles. This study provides a new perspective to design advanced electrode materials for lithium-ion batteries.
