Ultrahigh-Power Pseudocapacitors Based on Ordered Porous Heterostructures of Electron-Correlated Oxides.
Nanostructured transition-metal oxides can store high-density energy in fast surface redox reactions, but their poor conductivity causes remarkable reductions in the energy storage of most pseudocapacitors at high power delivery (fast charge/discharge rates). Here it is shown that electron-correlated oxide hybrid electrodes made of nanocrystalline vanadium sesquioxide and manganese dioxide with 3D and bicontinuous nanoporous architecture (NP V2O3/MnO2) have enhanced conductivity because of metallization of electron-correlated V2O3skeleton via insulator-to-metal transition. The conductive V2O3skeleton at ambient temperature enables fast electron and ion transports in the entire electrode and facilitates charge transfer at abundant V2O3/MnO2interface. These merits significantly improve the pseudocapacitive behavior and rate capability of the constituent MnO2. Symmetric pseudocapacitors assembled with binder-free NP V2O3/MnO2electrodes deliver ultrahigh electrical powers (up to ≈422 W cm23) while maintaining the high volumetric energy of thin-film lithium battery with excellent stability.
Key Laboratory of Automobile Materials Jilin University Ministry of Education and School of Materials Science and Engineering Jilin University Changchun 130022 P.R. China.
Xing-You
XY
Lang
Key Laboratory of Automobile Materials Jilin University Ministry of Education and School of Materials Science and Engineering Jilin University Changchun 130022 P.R. China.
Bo-Tian
BT
Liu
Key Laboratory of Automobile Materials Jilin University Ministry of Education and School of Materials Science and Engineering Jilin University Changchun 130022 P.R. China.
Xiang-Mei
XM
Shi
Key Laboratory of Automobile Materials Jilin University Ministry of Education and School of Materials Science and Engineering Jilin University Changchun 130022 P.R. China.
Ying-Qi
YQ
Li
Key Laboratory of Automobile Materials Jilin University Ministry of Education and School of Materials Science and Engineering Jilin University Changchun 130022 P.R. China.
Zi
Z
Wen
Key Laboratory of Automobile Materials Jilin University Ministry of Education and School of Materials Science and Engineering Jilin University Changchun 130022 P.R. China.
Qing
Q
Jiang
electrochemical energy storage; electron‐correlated oxides; porous electrodes; pseudocapacitors