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您的检索式：作者名="Yunkun Dai"
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| 1 | A closed-loop process for recycling LiNi_xCo_yMn_((1-x-y))O_2 from mixed cathode materials of lithium-ion batteries显示文摘With the rapid development of consumer electronics and electric vehicles(EV), a large number of spent lithium-ion batteries(LIBs) have been generated worldwide. Thus, effective recycling technologies to recapture a significant amount of valuable metals contained in spent LIBs are highly desirable to prevent the environmental pollution and resource depletion. In this work, a novel recycling technology to regenerate a LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 cathode material from spent LIBs with different cathode chemistries has been developed. By dismantling, crushing,leaching and impurity removing, the LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2(selected as an example of LiNi_xCo_yMn_(1-x-y)O_2) powder can be directly prepared from the purified leaching solution via co-precipitation followed by solid-state synthesis. For comparison purposes, a fresh-synthesized sample with the same composition has also been prepared using the commercial raw materials via the same method. X-ray diffraction(XRD), scanning electron microscopy(SEM) and electrochemical measurements have been carried out to characterize these samples. The electrochemical test result suggests that the re-synthesized sample delivers cycle performance and low rate capability which are comparable to those of the freshsynthesized sample. This novel recycling technique can be of great value to the regeneration of a pure and marketable LiNi_xCo_yMn_(1-x-y)O_2 cathode material with low secondary pollution. | Rujuan Zheng Wenhui Wang Yunkun Dai Quanxin Ma Yuanlong Liu Deying Mu Ruhong Li Jie Rena Changsong Dai | 2017 | Green Energy & Environment2017，2，1： | 11 |
| 2 | Effect of polytetrafluoroethylene(PTFE)in current collecting layer on the performance of zinc-air battery显示文摘Beyond reasonable designing catalysts,the optimization of preparing air cathode has far-reaching implications for the development of Zinc-air batteries.In this study,the effect of Polytetrafluoroethylene(PTFE)in current collecting layer on the performance of Zinc-air battery was investigated.The results showed that as the polytetrafluoroethylene(PTFE)content and heat treatment temperature changed,the hydrophobicity and porosity of current collecting layer also changed,thereby affecting the performance of air cathode.The air cathode assembled with PTFE-3-300 possessed an excellent electrochemical performance,which was prepared by brushing PTFE and acetylene black(wherein the mass ratio of them is 18:5)on current collecting layer and then heating at 300℃.The obtained air cathode displayed relatively small polarization loss and excellent rate performance,showing a polarization potential of -0.405 V vs.Hg/Hg O at 100 mA cm^(-2) and the voltage retention of 94.47% from 5 to 20 mA cm^(-2).Besides,the air cathode displayed excellent discharge stability maintaining average potential 1.3249 V for 100 h.Based on this work,a detailed understanding of the relationship of PTFE and current collecting layer can be achieved to improve the electrode design,architecture and fabrication. | Bing Liu Yunkun Dai Lin Li Hongda Zhang Lei Zhao Fanrong Kong Xulei Sui Zhenbo Wang | 2020 | Progress in Natural Science:Materials International2020，30，6： | 0 |
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