Chunli Peng
Central South University
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Transactions of Nonferrous Metals Society of China | 2013
Jiafeng Zhang; Bao Zhang; Xue-yi Guo; Xing Ou; Jian-long Wang; Chunli Peng; Jun-chao Zheng; Hezhang Chen; Chao Shen
Abstract 2LiFe 1– x Co x PO 4 –Li 3 V 2 (PO 4 ) 3 /C was synthesized using Fe 1–2 x Co 2 x VO 4 as precursor which was prepared by a simple co-precipitation method. 2LiFe 1– x Co x PO 4 –Li 3 V 2 (PO 4 ) 3 /C samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical measurements. All 2LiFe 1– x Co x PO 4 –Li 3 V 2 (PO 4 ) 3 /C composites are of the similar crystal structure. The XRD analysis and SEM images show that 2LiFe 0.96 Co 0.04 PO 4 –Li 3 V 2 (PO 4 ) 3 /C sample has the best-ordered structure and the smallest particle size. The charge–discharge tests demonstrate that these powders have the best electrochemical properties with an initial discharge capacity of 144.1 mA·h/g and capacity retention of 95.6% after 100 cycles when cycled at a current density of 0.1 C between 2.5 and 4.5 V.
ieee international nanoelectronics conference | 2010
Bao Zhang; Jiafeng Zhang; Chao Shen; Chunli Peng; Qian Lian
FePO<inf>4</inf>·2H<inf>2</inf>O precursor was synthesized from FePO<inf>4</inf>·7H<inf>2</inf>O, NH<inf>4</inf>H<inf>2</inf>PO<inf>4</inf>, NH<inf>3</inf>·H<inf>2</inf>O and H<inf>2</inf>O<inf>2</inf> as the oxidizing agent by solution precipitation route. Effects of reaction conditions, such as solution concentration, reaction temperature, stirring speed, adding amount of H<inf>2</inf>O<inf>2</inf>, pH and drying time on synthesis of FePO<inf>4</inf>·2H<inf>2</inf>O precursor were studied. Afterwards, Li<inf>2</inf>CO<inf>3</inf>, FePO<inf>4</inf>·2H<inf>2</inf>O and glucose were ground by wet process and dried fully. And then, LiFePO<inf>4</inf> was prepared by carbothermal reduction. The phases, structure and morphology of FePO<inf>4</inf>·2H<inf>2</inf>O and LiFePO<inf>4</inf> were characterized by ICP, TG-DSC, XRD and SEM. Effects of reaction conditions on electrochemical performance of LiFePO<inf>4</inf> were explored. The results show that no impurities exist in the FePO<inf>4</inf>·2H<inf>2</inf>O when reaction temperature is 80°C, stirring speed is 800r/min, adding amount of H<inf>2</inf>O<inf>2</inf> is 3mL, pH is 2, drying time is 12h and reactant concentration is from 0.1mol/L to 1.5mol/L. However, production rate of FePO<inf>4</inf>·2H<inf>2</inf>O is no more than 100% when pH is below 2 with either reactant concentration. LiFePO<inf>4</inf> made from FePO<inf>4</inf>·2H<inf>2</inf>O precursor synthesized under the condition that pH is 2 and reactant concentration is 1mol/L shows excellent electrochemical performance. It has an initial discharge capacity of 154.4mAh/g at 0.1C.
The Scientific World Journal | 2014
Bao Zhang; Tao Zeng; Jiafeng Zhang; Chunli Peng; Jun-chao Zheng; Guomin Chen
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.
Journal of Power Sources | 2014
Jiafeng Zhang; Chao Shen; Bao Zhang; Jun-chao Zheng; Chunli Peng; Xiao-wei Wang; Xin-bo Yuan; Hui Li; Guomin Chen
Electrochimica Acta | 2015
Jiafeng Zhang; Xiao-wei Wang; Bao Zhang; Chunli Peng; Hui Tong; Zhanhong Yang
Archive | 2010
Chunli Peng; Jiafeng Zhang; Qian Li; Xuan Cao; Bao Zhang
Archive | 2010
Bao Zhang; Jiafeng Zhang; Chao Shen; Chunli Peng
Archive | 2011
Chunli Peng; Jiafeng Zhang; Chao Shen
Archive | 2010
Bao Zhang; Jiafeng Zhang; Jun-chao Zheng; Chunli Peng; Chao Shen; Hezhang Chen
Archive | 2011
Bao Zhang; Qian Li; Chunli Peng; Chao Shen; Jiafeng Zhang