Synthesis of LiFe0.4Mn0.4Co0.2PO4/C cathode material of lithium ion battery with enhanced electrochemical performance

Phosphate Polyanion Materials as High-Voltage Lithium-Ion Battery Cathode: A Review

“…This method also avoids complex steps such as reflexing of alkoxides. Olivine components have been prepared by a coprecipitation method where transition metal hydroxides, oxalates, and carbonates were used as the metal precursors with suitable precipitating agents including ammonium hydroxide, ammonium oxalate, ammonia, ammonium persulfate, oxalic acid, and citric acid. − Remarkably, a coprecipitation method has been widely used to prepare spherical high tap density precursors for high volumetric energy density cathode materials in large scale applications. Sun et al reported coprecipitation synthesis of a microsized spherical LiMn 0.5 Fe 0.5 PO 4 cathode material for LIBs (4.5 V vs Li/Li + ) with a continuously stirred tank reactor (CSTR) using aqueous NH 4 OH as a precipitating agent .…”

“…Therefore, the report stated that the carbon-coated LiMn 0.85 Fe 0.15 PO 4 –LiFePO 4 core–shell cathode (with graphite anode at 2.7–4.4 V vs Li/Li + ) achieved higher stability at 0.5 C for 300 cycles than the bulk carbon-coated LiMn 0.85 Fe 0.15 PO 4 material (Figure A). Ternary LiFe 0.4 Mn 0.4 Co 0.2 PO 4 /C composite (5 V vs Li/Li + ) cathode materials had been synthesized through a stepwise coprecipitation and ball-milling method, which obtained its initial capacity of 163.3 mAh·g –1 at 0.1 C and could maintain high rate capacities of 110 and 140.7 mAh·g –1 after 100 cycles at 0.5 and 1 C, respectively . The high specific capacity improvement was obtained due to the homogeneous distribution of chemical elements in small-sized particles and uniform carbon coverage that enhanced the electronic conductivities of the cathode materials.…”

“…Ternary LiFe 0.4 Mn 0.4 Co 0.2 PO 4 /C composite (5 V vs Li/Li + ) cathode materials had been synthesized through a stepwise coprecipitation and ball-milling method, which obtained its initial capacity of 163.3 mAh•g −1 at 0.1 C and could maintain high rate capacities of 110 and 140.7 mAh•g −1 after 100 cycles at 0.5 and 1 C, respectively. 175 The high specific capacity improvement was obtained due to the homogeneous distribution of chemical elements in small-sized particles and uniform carbon coverage that enhanced the electronic conductivities of the cathode materials. Hence, the above reports reveal that coprecipitation is an effective method for a scalable and low-cost synthesis of phosphate-type composite cathodes with excellent electrochemical performances of LIBs.…”