Authors: Francisco Rivadulla; Manuel Bañobre-López; Camilo X Quintela; Alberto Piñeiro; Victor Pardo; Daniel Baldomir; Manuel Arturo López-Quintela; José Rivas; Carlos A Ramos; Horacio Salva; Jian-Shi Zhou; John B Goodenough Journal: Nat Mater Date: 2009-10-25 Impact factor: 43.841