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| 1 | Enhanced electrochemical property of FePO_4-coated LiNi_(0.5)Mn_(1.5)O_4 as cathode materials for Li-ion battery显示文摘Pristine LiNi_(0.5)Mn_(1.5)O_4and FePO_4-coated one with Fd-3m space groups were prepared by a sol-gel method.The structure and performance were studied by X-ray diffraction(XRD)rietveld refinement,scanning electron microscopy(SEM),high resolution transmission electron microscopy(HRTEM),energy dispersive spectrometer(EDS)mapping,electrochemical impedance spectroscopy(EIS)and chargedischarge tests,respectively.The lattice parameters of all samples almost remain the same from the Rietveld refinement,revealing that the crystallographic structure has no obvious difference between pristine LiNi_(0.5)Mn_(1.5)O_4and FePO_4-coated one.All materials show similar morphologies with uniform particle distribution with small particle size,and FePO_4coating does not affect the morphology of LiNi_(0.5)Mn_(1.5)O_4material.EDS mapping and HRTEM show that FePO_4may be successfully wrapped around the surfaces of LiNi_(0.5)Mn_(1.5)O_4particles,and provides an effective coating layer between the electrolyte and the surface of LiNi_(0.5)Mn_(1.5)O_4particles.FePO_4(1 wt%)-coated LiNi_(0.5)Mn_(1.5)O_4cathode shows the highest discharge capacity at high rate(2C)among all samples.After 80 cycles,the reversible discharge capacity of FePO_4(1 wt%)coated Li Ni-0.5Mn1.5O4is 117 m Ah g1,but the pristine one only has 50 m Ah g^(-1).FePO_4coating is an effective and controllable way to stabilize the LiNi_(0.5)Mn_(1.5)O_4/electrolyte interface,and avoids the direct contact between LiNi_(0.5)Mn_(1.5)O_4powders and electrolyte,then suppresses the side reactions and enhances the electrochemical performance of the LiNi_(0.5)Mn_(1.5)O_4. | Ting-Feng Yi Yan-Mei Li Xiao-Ya Li Jing-Jing Pan Qianyu Zhang Yan-Rong Zhu | 2017 | Science Bulletin2017，62，14： | 4 |
| 2 | 石墨Gibbs表面自由能对锂离子电池传统负极浆初始黏度和稳定性的影响显示文摘负极浆料的初始黏度和稳定性对锂离子电池的生产工艺和后期性能至关重要。但是关于石墨原料的理化性质对负极浆料初始黏度和稳定性的影响尚未从根本上阐明。通过对不同粒度和比表面积的商业化石墨进行初始黏度测试,发现负极浆料的初始黏度与石墨的非极性Gibbs表面自由能呈正相关。同时还发现,Gibbs表面自由能极性部分和非极性部分的相对大小对负极浆料的稳定性有影响。当Gibbs表面自由能极性部分接近非极性部分时,制备的浆料具有最佳的稳定性,且静置120 h以后克容量保持稳定。有趣的是,XRD和Raman光谱表征结果显示石墨粒子的Gibbs表面自由能与缺陷之间没有直接的线性关系。本研究可为锂离子电池工业生产中石墨原料的选择提供指导。 | 周奇 文博 张佳丽 刘锋 欧阳晓平 梁伊丽 吴泽轶 谢志勇 | 2023 | Journal of Central South University2023，30，3： | 0 |
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