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Unveiling the impact of residual Li conversion and cation ordering on electrochemical performance of Co-free Ni-rich cathodes

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Nano Research 2022年第10期15卷 9038-9046页

作者： Chu Wang Lei Tan Hongling Yi Zixiang Zhao Xiaoli Yi Youyuan Zhou Junchao Zheng Jiexi Wang Lingjun Li School of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410114China School of Energy and Power Engineering Changsha University of Science and TechnologyChangsha 410114China School of Metallurgy and Environment Central South UniversityChangsha 410083China Hunan Changyuan Lico Co. Ltd.Changsha 410205China

The residual Li and Li^(+)/Ni_(2)+cation mixing play essential roles in the electrochemical properties of Ni-rich ***,a general relationship between the residual Li conversion,cation mixing,and their effects on the Li^(+)kinetics and structural stability has yet to be established,due to the presence of cobalt in the ***,we explore the synergistic impact of the residual Li conversion and cation ordering on a Co-free Ni-rich cathode(i.e.,LiNi0.95Mn0.05O_(2)).It discloses that the rate capability is mainly affected by residual Li contents and operating ***,residual Li can be electrochemically converted to cathode electrolyte interphase(CEI)below 4.3 V,thus inducing high interphase resistance,and decomposes to produce CO_(2)-dominated gas at 4.5 V,causing temporary enhancement of Li^(+)diffusivity but severe surface degradation during ***,the cycling performance of Co-free Ni-rich cathode is not only determined by Li^(+)/Ni_(2)+cation-ordered superlattice,which enhances the structural stability as it functions as the pillar to impede lattice collapse at a highly charged state,but also by the robust CEI layers which protect the bulk from electrolyte attack under 4.3 *** findings promote an in-depth understanding of residual Li conversion and Li^(+)/Ni_(2)+cation ordering on Co-free Ni-rich cathode.

关键词： Li-ion batteries Co-free Ni-rich cathodes residual Li conversion cation ordering

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cation ordering and Phase Competition in Ba8M2+M'65+O24 Hexagonal Perovskite Tantalate and Niobate Dielectrics

Cation Ordering and Phase Competition in Ba8M2+M'65+O24 Hexa...

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中国化学会第十届全国无机化学学术会议

作者： Xiaojun Kuang College of Chemistry and Bioengineering Guilin University of Technology

BaMM’O-type B-cation deficient hexagonal perovskite tantalates and niobates attract attention as microwave dielectric resonators because of their high quality factors and interesting structural chemistry. 8-layer hexagonal perovskite Niobates display twin-shift option and rarely nanometer-scale long-range cation order has been observed in the shifted BaCoNbO, BaZnNbO and BaZnNbO so far. While their Ta-counterparts form exclusively twinned structures. Here we details the correlation of the cation order and phase competition with the B-cationic size and charge differences as well as the bonding preferences associated with the bonding covalence and the second-order Jahn-Teller(SOJT) effect of d Nb and Ta in the BaMM’O hexagonal perovskites. Also we present the Ta-substitution effect on lowering the temperature coefficient of resonant frequency t of 8-lyaer shifted hexagonal perovskite dielectrics toward near-zero t values.

关键词： Microwave dielectric ceramic Hexagonal perovskite cation ordering phase competition

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Tuning the phase evolution pathway of LiNi_(0.5)Mn_(1.5)O_(4) synthesis from binary intermediates to ternary intermediates with thermal regulating agent

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Journal of Energy Chemistry 2022年第2期31卷 62-70页

作者： Libin Wu Hua Huo Qun Wang Xucai Yin Shu Guo Jiajun Wang Chunyu Du Pengjian Zuo Geping Yin Yunzhi Gao Key Laboratory of Materials for New Energy Conversion and Storage(Ministry of Industry and Information Technology) School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina Center of Analysis and Measurement Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Transition metal cation ordering is essential for controlling the electrochemical performance of cubic spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO),which is conventionally adjusted by optimizing the high temperature sintering and annealing *** this present work,multiple characterization techniques,including 6,7Li NMR,XRD and HRTEM,have been combined to trace the phase transformation and morphology evolution during *** has been illustrated that simultaneous formation of LiMn_(2)O_(4)(LMO)and LiNiO_(2)(LNO)binary oxides and their conversion into highly reactive LixNi^(3+)_(y)Mn_(3.5+)_(z)O ternary intermediate is a thermal dynamically difficult but crucial step in the synthesis of LNMO ternary oxide.A new strategy of modifying the intermediates formation pathway from binary mode to ternary mode using thermal regulating agent has been *** synthesized with thermal regulating agent exhibits supreme rate capability,long-cycling performance(even at elevated temperature)and excellent capacity *** a high rate of 100 C,the assembled battery delivers a discharge capacity of 99 mAh g^(-1).This study provides a way to control the formation pathway of complex oxides using thermal regulating agent.

关键词： cation ordering LiNi_(0.5)Mn_(1.5)O_(4) Lithium ion batteries Synthesis of ternary oxide Thermal regulation

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