K+-β-Ferrite as a New Cathode Active Material for Lithium Secondary Battery S. Ito, K. Ui, N. Hoshi, H. Kurosawa, N. Koura et K. Akashi J. Phys. IV France, 07 C1 (1997) C1-161-C1-162 DOI: 10.1051/jp4:1997158