New Lithiated NASICON-Type Li[sub 2]Ni[sub 2](MoO[sub 4])[sub 3] for Rechargeable Lithium Batteries

The Adaptable Lyonsite Structure

“…High electrical conductivity was first observed for Li 2 Cu 2 A C H T U N G T R E N N U N G (MoO 4 ) 3 in 1981, [52] and a significant effort has since been made to investigate the conductivity of many of the molybdates. [19,[53][54][55][56][57][58] The lyonsite structure fits the criteria for NASICON ion conductors owing to the arrangement of the isolated (MO 4 ) nÀ polyanion tetrahedra. A review of various families of A x B y A C H T U N G T R E N N U N G (MoO 4 ) z molybdate families discusses the ionic conduction of lyonsite type molybdates.…”

Nano-sized copper tungstate thin films as positive electrodes for rechargeable Li batteries

“…Molybdates and vanadates are the typical ones, which have been widely investigated as posi- * Corresponding author. tive electrodes for rechargeable lithium cells [3][4][5][6][7][8]. Unlike the phosphate [9][10][11][12], where the polyanion PO 4 3− serves only as a structural framework and is not electrochemically active, the materials based on Mo-O and V-O polyanions provide additional capacity due to the expected redox activity of Mo 6+ /Mo 4+ and V 5+ /V 4+ .…”

Enhanced cycling properties of transition metal molybdates, Li x M2(MoO4)3 {0 ≤ x < 3} [M = Co,Ni]: a nanocomposite approach for lithium batteries

“…In this connection, new cathode materials are being investigated in recent times, and particularly polyanion materials have gained enormous interest for extensive research, as they are the new generation cathode materials for lithium-ion batteries [4][5][6][7]. However, application of such materials has not realized in practical cells because of their poor rate cyclability associated with a very low electronic conductivity, which consistently exists in both olivine-and Nasicon-like polyanion materials examined so far owing to their open framework structure [8][9][10].…”

“…Recently, we carried out investigation on a family of new cathode polyanion materials namely, M 2 (MoO 4 ) 3 {M=Ni, Co, Mn} both in the lithiated phase, Li 2 M 2 (MoO 4 ) 3 [4,8], as well as in the lithium-free phase, Li x M 2 (MoO 4 ) 3 [18,19], with an aim to employ these materials in lithium-ion cells, and reported our accomplishment in enriching the electronic conductivity and hence achieving better extended cycle performance of nanocomposite Li 2 M 2 (MoO 4 ) 3 {M= Ni, Co} by introducing small amounts of mesoporous carbon black during cathode fabrication [20,21]. An optimized solid state synthesis route using hydrogen or carbon as the reducing agent at high-temperature sintering has been applied to obtain small uniform particles of Li 3 V 2 (PO 4 ) 3 showing a high first-discharge capacity of 143 mAh/g [22].…”