1. Faraday Materials Laboratory (FaMaL), Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
2. Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
3. Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology (KTH), Stockholm S-100 44, Sweden
4. Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
5. Helmholtz Institute Ulm (HIU), Electrochemical Energy Storage, Ulm 89081, Germany
6. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Karlsruhe 76021, Germany