Affiliation:
1. State Key Laboratory of Advanced Processing and Recycling of Non‐ferrous Metal Lanzhou University of Technology Lanzhou 730050 P. R. China
2. State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 P. R. China
3. State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
4. Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 P. R. China
5. Institute of Advanced Structure Technology Beijing Institute of Technology Beijing 100081 P. R. China
Abstract
AbstractThe positive electrodes of non‐aqueous aluminum ion batteries (AIBs) frequently encounter significant issues, for instance, low capacity in graphite (mechanism: anion de/intercalation and large electrode deformation induced) and poor stability in inorganic positive electrodes (mechanism: multi‐electron redox reaction and dissolution of active materials induced). Here, metallo‐porphyrin compounds (employed Fe2+, Co2+, Ni2+, Cu2+, and Zn2+ as the ion centers) are introduced to effectively enhance both the cycling stability and reversible capacity due to the formation of stable conjugated metal‐organic coordination and presence of axially coordinated active sites, respectively. With the regulation of electronic energy levels, the d‐orbitals in the redox reactions and electron transfer pathways can be rearranged. The 5,10,15,20‐tetraphenyl‐21H,23H‐porphine nickle(II) (NiTPP) presents the highest specific capacity (177.1 mAh g−1), with an increment of 32.1% and 77.1% in comparison with the capacities of H2TPP and graphite, respectively, which offers a new route for developing high‐capacity positive electrodes for stable AIBs.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities