Chemical coupling of manganese–cobalt oxide and oxidized multi-walled carbon nanotubes for enhanced lithium storage
Journal of Colloid and Interface Science(2022)
摘要
Carbonaceous materials are extensively utilized to optimize the electrochemical performance of the transition metal oxides as anode for lithium-ion batteries. However, the in-depth mechanism of the synergistic effect and the interfacial interaction between transition metal oxides and conductive carbon material has not been elucidated clearly. Herein, by using the oxidized multi-walled carbon nanotubes (oMWCNTs), an advanced MnO2/(Co, Mn)(Co, Mn)2O4/oMWCNTs (MO/CMO/oMWCNTs) nanocomposite with abundant metal−oxygen−carbon (Me−OC) bonds as linkage bridge is fabricated for the first time. The strong covalent bonds interactions can simultaneously enhance the intrinsic sluggish kinetics and structural stability of MO/CMO/oMWCNTs nanocomposite. Meanwhile, the mixed transition metal oxides featuring mix valence state can significantly promote the electrode material activity. Consequently, the newly prepared MO/CMO/oMWCNTs electrode displays superior long-term durability with the capacity of 897 mAh g−1 over 1000 cycles at 2 A g−1 and ultrafast charging/discharging capability of 673 mAh g−1 at 5 A g−1. Detailed electrochemical kinetic analysis reveals that over 70% of the energy storage of MO/CMO/oMWCNTs electrode is dominated by the pseudocapacitive behavior. This work demonstrates an easily scalable approach for constructing high-performance transition metal oxides/carbon electrode materials through interfacial regulation.
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关键词
Lithium-ion batteries,Mixed transition metal oxides,Oxidized carbon nanotubes,Interface control,Metal−oxygen−carbon bonds
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