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81.
Xiaochang Qiao Jiandong Yang Yaobin Wang Quanqi Chen Tingting Zhang Li Liu Xianyou Wang 《Journal of Solid State Electrochemistry》2012,16(3):1211-1217
LiVPO4F/C composites with better electrochemical performance were prepared by calcination of LiF and amorphous vanadium phosphorus
oxide (VPO) intermediate synthesized by a sol–gel method using H3PO4, V2O5 and citric acid as raw materials. The properties of LiVPO4F/C composites were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical tests.
The analysis of XRD patterns and Fourier transform infrared spectra (FTIR) reveal that VPO intermediate prepared by sol–gel
method is amorphous and VPO4 may exist in VPO intermediate. The compositions of LiVPO4F/C composites are related to the calcination temperature for preparation of amorphous VPO/C intermediate and LiVPO4F/C composite prepared by VPO/C synthesized at 700°C consists of a single crystal phase of LiVPO4F. The electrochemical tests show that LiVPO4F/C composite prepared by VPO/C synthesized at 700°C exhibits higher discharge capacity and excellent cycle performance. This
LiVPO4F/C composite displays discharge capacity of 133 mAh g−1 at 0.5 C (78 mA g−1) and remains capacity retention of 96.8% after 30 cycles, even at a high rate of 5 C, the composite exhibits high discharge
capacity of 115 mAh g−1 and capacity retention of 97% after 100 cycles. 相似文献
82.
Shunyi?Yang Xianyou?WangEmail author Xiukang?Yang Li?Liu Ziling?Liu Yansong?Bai Yingping?Wang 《Journal of Solid State Electrochemistry》2012,16(3):1229-1237
Spherical Li[Ni1/3Co1/3Mn1/3]O2 cathode materials with different microstructure have been prepared by a continuous carbonate co-precipitation method using
LiOH⋅H2O, Li2CO3, CH3COOLi⋅2H2O and LiNO3 as lithium source. The effects of Li source on the physical and electrochemical properties of Li[Ni1/3Co1/3Mn1/3]O2 are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical measurements. The results
show that the morphology, tap density and high rate cycling performance of Li[Ni1/3Co1/3Mn1/3]O2 spherical particles are strongly affected by Li source. Among the four Li sources used in this study, LiOH⋅H2O is beneficial to enhance the tap density of Li[Ni1/3Co1/3Mn1/3]O2, and the tap density of as-prepared sample reaches 2.32 g cm−3. Meanwhile, Li2CO3 is preferable when preparing the Li[Ni1/3Co1/3Mn1/3]O2 with high rate cycling performance, upon extended cycling at 1 and 5C rates, 97.5% and 92% of the initial discharge capacity
can be maintained after 100 cycles. 相似文献
83.