| 1 | Hierarchical yolk-shell structured Li-rich cathode boosting cycling and voltage stabled LIBs显示文摘Despite the high energy density of lithium-rich(Li-rich)cathodes,their implementation is hampered by the unsatisfied rate capacity and poor cycling performance accompanied with substantial voltage decay.To address these issues,the hierarchical yolk-shell structured Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)cathodes(YK-LMNCO)was proposed and synthesized through a facile glycerol assisted solvothermal approach and the following lithiation process.Benefitting from the shortened lithium diffusion lengths and the enhanced tolerance to the large volume variation upon lithium ions intercalation/de-intercalation,the unique structure reciprocates an initial coulombic efficiency of 85.8%,an outstanding capacity retention rate of 89.1%after cycling at 2.0 C for 200 cycles with a minor voltage drop,and a capacity retention rate of 93.8%after cycling at 10.0 C for 500 cycles,85.2%for 1,000 cycles.When assembled with graphite as anode,the YK-LMNCO//graphite full cell shows a remarkable capacity retention rate of 87.2%after cycling at 5.0 C for 50 cycles.Our facile strategy for constructing the yolk-shell structured Li-rich cathodes with high capacity and voltage stability sheds light on synthesizing other lithium storage materials. | Yanchen Liu Yafen Chen Jing Wang Wei Wang Zhiyu Ding Leyuan Li Yang Zhang Yida Deng JunweiWu Yanan Chen | 2022 | Nano Research2022，15，4： | 3 |
| 2 | Effects of Cl- and SO_4^(2-) Ions on Corrosion Behavior of X70 Steel显示文摘Corrosion behaviors of X70 steel were studied by means of electrochemical experiments and morphology observation.First, through potentiodynamic polarization in solution of various Cl^- ions concentration, it was found that Epit began to appear in solution of Cl^- concentration above 0.1 mol/L, and there was a critical point of Cl^- concentration between 0.05 mol/L and 0.1 mol/L, below which the extent of pitting and general corrosion were trivial, while in solution of Cl^- concentration above 0.1 mol/L, general and pitting corrosion became greater as the increasing of Cl^- concentration. All of them were confirmed by the SEM observations after anodic polarization. Second, via the potentiodynamic polarization curves of X70 steel in 0.5 mol/L Cl^- solution with 0, 0.05, 0.5 and 1 mol/L SO4^2- ions, it was found SO4^2- ions were able to inhibit corrosion aroused from Cl^- ions, accordingly a model was set up to describe the process. In addition, to further explore the inhibited effect of SO4^2- ions, EIS was used in solutions of different Cl^- and SO4^2- concentrations, the results revealed that the electrochemical resistance has a relation with the [SO4^2-]/[Cl^-], that was, the bigger the value of [SO4^2-]/[Cl^-], the greater the electrochemical resistance. | JunweiWU XiaogangLI CuiweiDU SongWANG YiquanSONG | 2005 | Journal of Materials Science & Technology2005，21，1： | 2 |
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