“…Carbon or carbon-containing compounds added to the precursors or to the intermediate mixtures usually protect Fe 2+ from oxidation, inhibits the grain growth and improves the electronic conductivity. 45 Up to now, various carbon or carbon precursors, such as poly(vinyl-pyrrolidone) 46 , P123 polymer 36 , saccharides 34,38,41,[47][48][49][50][51] , L-ascorbic acid 35 , citric acid 37,39,40,51 , multiwall carbon nanotubes 37,52 , phenolic resin 53 etc., have been reported to prepare Li 2 FeSiO 4 /C composites. However, besides the few reports on hydrothermal 41,51 , solvothermal 5 and evaporation-induced self-assembly methods 36 , sol-gel and solid state reaction are the two most commonly used methods to prepare Li 2 FeSiO 4 /C composites.…”