Pervez Syed Atif, Kim Doohun, Doh Chil-Hoon, Farooq Umer, Choi Hae-Young, Choi Jung-Hee
†Korea Electro-technology Research Institute (KERI), Changwon 642-120, Republic of Korea.
‡Electrical Functionality Material Engineering (KERI Campus), Korea University of Science and Technology, Daejeon 305-333, Republic of Korea.
ACS Appl Mater Interfaces. 2015 Apr 15;7(14):7635-43. doi: 10.1021/acsami.5b00341. Epub 2015 Mar 31.
A novel design for an anodic WO3 mesosponge @ carbon has been introduced as a highly stable and long cyclic life Li-ion battery electrode. The nanocomposite was successfully synthesized via single-step electrochemical anodization and subsequent heat treatment in an acetylene and argon gas environment. Morphological and compositional characterization of the resultant materials revealed that the composite consisted of a three-dimensional interconnected network of WO3 mesosponge layers conformally coated with a 5 nm thick carbon layer and grown directly on top of tungsten metal. The results demonstrated that the carbon-coated mesosponge WO3 layers exhibit a capacity retention of 87% after completion of 100 charge/discharge cycles, which is significantly higher than the values of 25% for the crystalline (without carbon coating) or 40% for the as-prepared mesosponge WO3 layers. The improved electrochemical response was attributed to the higher stability and enhanced electrical conductivity offered by the carbon coating layer.
一种新型的阳极氧化WO₃介孔海绵@碳设计被引入作为一种高度稳定且具有长循环寿命的锂离子电池电极。通过单步电化学阳极氧化以及随后在乙炔和氩气环境中的热处理成功合成了这种纳米复合材料。对所得材料的形态和成分表征表明，该复合材料由三维相互连接的WO₃介孔海绵层网络组成，该网络被5纳米厚的碳层共形包覆，并直接生长在钨金属顶部。结果表明，经过100次充放电循环后，碳包覆的介孔海绵WO₃层的容量保持率为87%，这显著高于晶体（无碳包覆）的25%或制备的介孔海绵WO₃层的40%。电化学响应的改善归因于碳包覆层提供的更高稳定性和增强的电导率。
