Citation: WANG Zhen-Po, LIU Wen, WANG Yue, ZHAO Chun-Song, ZHANG Shu-Ping, CHEN Ji-Tao, ZHOU Heng-Hui, ZHANG Xin-Xiang. Synthesis and Characterization of Mg and Ti Ions Co-Doped Lithium Iron Phosphate and Its Lithium-Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2012, 28(09): 2084-2090. doi: 10.3866/PKU.WHXB201207043 shu

Synthesis and Characterization of Mg and Ti Ions Co-Doped Lithium Iron Phosphate and Its Lithium-Ion Batteries

1.
1. National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, P. R. China;
2. Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China;
3. Institute of Chemical Defense of PLA, Beijing 102205, P. R. China;
4. Pulead Technology Industry Co., LTD., Beijing 102200, P. R. China

Received Date: 20 April 2012
Available Online: 4 July 2012
Fund Project: 国家自然科学基金(61004092) (61004092)国家高技术研究发展计划项目(863) (2009AA035200)资助 (863) (2009AA035200)

Mg and Ti ions co-doped (Li_0.98Mg_0.01)(Fe_0.98Ti_0.01)PO₄/C cathode material for lithium-ion batteries was prepared by a solid-state method under N₂ atmosphere. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and galvanostatic charge-discharge test. Results indicated that Mg and Ti ions co-doping remarkably improved the electrochemical performance of LiFePO₄, including rate capacity, temperature behavior, and cycling stability. Discharge capacities of 154.7 and 146.9 mAh·g^-1 were obtained at the rates of 0.2C and 1C for half-cell tests, respectively. For 60 Ah full-cell tests, 100% of 1C capacity was maintained even at 3C rate, 89.7% and 63.1% of initial capacity at room temperature were retained at 0 and -20 °C, respectively. 89% capacity retention remained after 2000 cycles at room temperature, presenting excellent cycle stability. This investigation suggests that the present co-doping material and the resulting battery possess large discharge capacity and excellent cycling performance, making it applicable in electric vehicle (EV)/hybrid electric vehicle (HEV) and energy storage systems on a large scale.
- Lithium iron phosphate,
- Co-doping,
- Rate capacity,
- Power battery,
- Energy storage battery
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