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| 1 | Effect of Spherical Particle Size on the Electrochemical Properties of Lithium Iron Phosphate显示文摘The effect of spherical particle size on the surface morphology, electrochemical property and processability of lithium iron phosphate was systematically studied. Spherical lithium iron phosphate with different particle size distributions controlled with ball time of precursor slurry was prepared by spray drying method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), charge and discharge measurements and EIS. The electrochemical performances of the sample materials were measured by coin cells and 14500 batteries. XRD shows that the spherical lithium iron phosphate with different particle sizes all have good crystal structure due to the perfect mixing of the raw materials and rapid drying. The lithium iron phosphate microsphere with different particle sizes self-assembled with submicron primary particles has a core-shell structure. The longer ball time the precursors are, the smaller the active material particles are prepared. The electrode material with 6 h ball time of precursor slurry has the best physical properties and the processability. The composite has a uniform particle size and higher tap density of 1.46 g/cm3, which delivers a discharge capacity of 167.6 mAh/g at a discharge rate of 0.5 C. The results were confirmed by the 14 500 mA h cylindrical batteries, which delivers a discharge capacity of 579 mAh at 0.5 C. And low-temperature performance with capacity of 458.5 mA h at -20 °C under a discharge rate of 0.5 C is the 79.2% of the same discharge rate at 25 °C. Otherwise, the 14500 batteries also exhibit excellent cycling performance and the capacity maintains 93% after 2 000 cycles. | 刘远远 LIU Hao ZHAO Xinxin WANG Li 梁广川 | 2019 | Journal of Wuhan University of Technology(Materials Science)2019，34，3： | 4 |
| 2 | 锂离子电池正极材料磷酸铁锂的研究进展显示文摘以磷酸铁锂为正极材料的锂离子电池以其高容量、高环保、长寿命、低价格等特点,越来越受到研究者的青睐。文章对磷酸铁锂的合成方法、包覆与掺杂改性等的最新研究进展进行了综述,并指出了今后的研究重点。 | 马晓华 杨建文 叶璟 | 2013 | 广东化工2013，40，8： | 1 |
| 3 | 共混PVDF/PAN纳米纤维隔膜材料制备与研究显示文摘为了提高隔膜材料的孔隙率,优异热稳定性等,以热学性能良好的聚丙烯腈(PAN)和机械性能良好的聚偏氟乙烯(PVDF)为原料,制备出3D空间结构的PVDF/PAN共混纳米纤维膜材料。为了得到融合性较好的两种聚合物共混纺丝,研究了不同共混比例(3∶7,5∶5,7∶3)的PVDF/PAN纳米纤维膜的结构形貌和性能。结果表明:制得的共混纳米纤维膜孔隙率达到68.9%~72.0%;其次随着PVDF比例的增加,力学性能有所提高,纵向应力可达11.81 MPa,并且在130℃时能保持良好的稳定性,这对未来生产更安全、稳定且高效的隔膜具有重要意义。 | 葛烨倩 周荣鑫 黄伟炎 | 2021 | 现代纺织技术2021，29，1： | 1 |
| 4 | Structural and spectroscopic analysis of wurtzite(ZnO)_(1-x)(Sb_2O_3)_x composite semiconductor显示文摘The structural, vibrational and impedance analysis for(Zn O)1 x(Sb2O3)xcomposite synthesized by solid state reaction technique were carried out in the present investigation. X-ray diffraction(XRD) study showed that(Zn O)1 x(Sb2O3)xcomposite has hexagonal(wurtzite) crystal structure. Variation in lattice constants with Sb-doping indicated the proper incorporation of Sb dopant in Zn O host matrix. The results of Raman spectroscopy test suggested the signature of E2(high) and E1(TO) Raman modes, and verified the wurtzite structure of(Zn O)1 x(Sb2O3)x composite. Two additional phonon bands(671, 712) cm 1appeared in Raman spectra of composite samples due to the existence of the lattice defects caused by Sb doping or may be other intrinsic lattice defects formed during the synthesis of(Zn O)1 x(Sb2O3)xcomposite. The frequency dependent on the electrical characteristics, such as, impedance(Z), dielectric constant(ε) and AC conductivity(σ) have been studied in a range of frequencies for different Sb concentration at room temperature. The electrical measurement results showed that the impedance increased with Sb dopant concentration, while dielectric constant and AC conductivity decreased with Sb dopant concentration. | Hafeez ullah Amjid Iqbal M. Zakria Arshad Mahmood | 2015 | Progress in Natural Science:Materials International2015，25，2： | 0 |
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