Chang Yueqi, Dong Shanmu, Ju Yuhang, Xiao Dongdong, Zhou Xinhong, Zhang Lixue, Chen Xiao, Shang Chaoqun, Gu Lin, Peng Zhangquan, Cui Guanglei
Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 P. R. China; College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 P. R. China.
Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 P. R. China.
Adv Sci (Weinh). 2015 Jun 18;2(8):1500092. doi: 10.1002/advs.201500092. eCollection 2015 Aug.
Operation of the nonaqueous Li-O battery critically relies on the reversible oxygen reduction/evolution reactions in the porous cathode. Carbon and polymeric binder, widely used for the construction of Li-O cathode, have recently been shown to decompose in the O environment and thus cannot sustain the desired battery reactions. Identifying stable cathode materials is thus a major current challenge that has motivated extensive search for noncarbonaceous alternatives. Here, RuO /titanium nitride nanotube arrays (RuO /TiN NTA) containing neither carbon nor binder are used as the cathode for nonaqueous Li-O batteries. The free standing TiN NTA electrode is more stable than carbon electrode, and possesses enhanced electronic conductivity compared to TiN nanoparticle bound with polytetrafluoroethylene due to a direct contact between TiN and Ti mesh substrate. RuO is electrodeposited into TiN NTA to form a coaxial nanostructure, which can further promote the oxygen evolution reaction. This optimized monolithic electrode can avoid the side reaction arising from carbon material, which exhibits low overpotential and excellent cycle stability over 300 cycles. These results presented here demonstrate a highly effective carbon-free cathode and further imply that the structure designing of cathode plays a critical role for improving the electrochemical performance of nonaqueous Li-O batteries.
非水锂氧电池的运行严重依赖于多孔阴极中可逆的氧还原/析出反应。广泛用于构建锂氧阴极的碳和聚合物粘结剂，最近已被证明在氧环境中会分解，因此无法维持所需的电池反应。因此，确定稳定的阴极材料是当前的一项重大挑战，这促使人们广泛寻找非碳质替代材料。在此，不含碳和粘结剂的RuO₂/氮化钛纳米管阵列（RuO₂/TiN NTA）被用作非水锂氧电池的阴极。独立的TiN NTA电极比碳电极更稳定，并且由于TiN与Ti网基板之间的直接接触，与与聚四氟乙烯结合的TiN纳米颗粒相比，具有更高的电子导电性。RuO₂电沉积到TiN NTA中形成同轴纳米结构，这可以进一步促进析氧反应。这种优化的整体电极可以避免由碳材料引起的副反应，该电极表现出低过电位和超过300次循环的优异循环稳定性。此处呈现的这些结果展示了一种高效的无碳阴极，并进一步表明阴极的结构设计对提高非水锂氧电池的电化学性能起着关键作用。
