title: Excellent temperature performance of spherical LiFePO4/C composites modified with composite carbon and metal oxides.
abstract: Nanosized spherical LiFePO4/C composite was synthesized from nanosized spherical FePO4 ·2H2O, Li2C2O4, aluminum oxide, titanium oxide, oxalic acid, and sucrose by binary sintering process. The phases and morphologies of LiFePO4/C were characterized using SEM, TEM, CV, EIS, EDS, and EDX as well as charging and discharging measurements. The results showed that the as-prepared LiFePO4/C composite with good conductive webs from nanosized spherical FePO4 ·2H2O exhibits excellent electrochemical performances, delivering an initial discharge capacity of 161.7 mAh·g(-1) at a 0.1 C rate, 152.4 mAh·g(-1) at a 1 C rate and 131.7 mAh·g(-1) at a 5 C rate, and the capacity retention of 99.1%, 98.7%, and 95.8%, respectively, after 50 cycles. Meanwhile, the high and low temperature performance is excellent for 18650 battery, maintaining capacity retention of 101.7%, 95.0%, 88.3%, and 79.3% at 55°C, 0°C, -10°C, and -20°C by comparison withthat of room temperature (25°C) at the 0.5 C rate over a voltage range of 2.2 V to 3.6 V, respectively.
authors: School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.
authors: Bao
authors: B
authors: Zhang
authors: School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.
authors: Tao
authors: T
authors: Zeng
authors: School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.
authors: Jiafeng
authors: J
authors: Zhang
authors: School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.
authors: Chunli
authors: C
authors: Peng
authors: School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.
authors: Junchao
authors: J
authors: Zheng
authors: School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.
authors: Guomin
authors: G
authors: Chen
mesh_terms: D002244:Carbon / Q000737:chemistry*; D004563:Electrochemistry; D007501:Iron / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics
chemical_list: C473349:LiFePO4; D010087:Oxides; D010710:Phosphates; D002244:Carbon; D008094:Lithium; D007501:Iron