Preparation and Electrical Properties of Nanoparticle MoO2@Carbon Nanotube Composite Fiber Electrode
A nanoparticle MoO2@carbon nanotube(CNT)composite fiber electrode structure was designed.Through a simple electrochemical deposition method and a series of characterization techniques,MoO2 nanoparticles with diameter of 10-50 nm were evenly dispersed on the surface and interior of CNT fiber bundles,and a fiber electrode material with excellent flexibility and stability was obtained.The electrical properties and electrochemical behavior of the fibrous electrode material as a positive electrode material for a queous zinc-ion battery were studied.The study results show that under the current density of 900 mA/cm3(4.7 A/g),the capacity retention rate of the fiber electrode material is 109％after 1 700 cycles at normal temperature,and the capacity retention rate of 103％after 1 000 cycles at low temperature of-30℃,which has excellent cycling stability at normal temperature and low temperature.Under the current density of 1 800 mA/cm3(9.4 A/g),the discharge capacity is still 17.5 mA·h/cm3(91.5 mA·h/g),showing excellent rate performance.In addition,it is concluded that the insertion/extraction of Zn2+mainly occurs on the Mo—O—C bond,and the oxidation-reduction reaction mainly occurs between Mo6+,Mo5+and Mo4+during the whole charge-discharge process,which provides a new idea for the development of novel fiber electrode materials.
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