Improving high-rate performance of mesoporous Li2FeSiO4/Fe7SiO10/C nanocomposite cathode with a mixed valence Fe7SiO10 nanocrystal

Solution-processable design strategy for a Li2FeSiO4@C/Fe nanocomposite as a cathode material for high power lithium-ion batteries

“…Orthosilicate Li 2 MSiO 4 (M ¼ Fe, Mn, Co, Ni) compounds are promising electrode materials due to its theoretical capacity of 333 mA h g À1 . [15][16][17] Although a lot of reports have demonstrated that the Li 2 FeSiO 4 (LFS) exhibits stable cyclability, [15][16][17][18][19][20] its application is still plagued by poor electrical conductivity ($10 À14 S cm À1 ) and low Li + diffusion coefficient ($10 À16 cm 2 S À1 ) that lead to rapid drop of rate capacity and large voltage fade.…”

“…Inspired by production of Sn-based composite by carbothermal reduction 21,22 and in situ crystallization of SiO 2 -based oxides, 20,[23][24][25] we envisaged that nanoscale iron (0 valence Fe) could be produced by carbothermal reduction and used to design 'metal-oxide' composites. The target structure of a designed nanocomposite is shown in Scheme 1d, which is similar to the 'oxide nanocrystal-graphene' hybrid conguration.…”

Synthesis of Li 2 FeSiO 4 /carbon nano-composites by impregnation method

“…To overcome these severe issues, many attempts have been made in the literature, including micro-nano architecturing [23][24][25] , super-valence dopping 26,27 , incorporation of lithium ion 28,29 or electron conductive matrix 30 , non-stoichiometry [31][32][33] and carbon coating 5,[34][35][36][37][38][39][40][41][42][43][44] . Among these methods, carbon coating is the most wide-spread one.…”

3D porous hierarchical Li2FeSiO4/C for rechargeable lithium batteries

“…12,13 These assemblies are composed of uniform particles in an ordered manner and can facilitate both electron and ion movement, leading to a signicant enhancement in activity. In this regard, many hierarchical structures, such as Li 2 FeSiO 4 /CNT coaxial nanocable, Li 2 FeSiO 4 hollow spheres, 14 porous composites, 15,16 and Li 2 FeSiO 4 /C nanoworms, 17 have been appropriately engineered and have shown appealing performances. In particular, threedimensional (3D) porous materials have attracted tremendous interest.…”