Lihan Zhang , Shuwei Wang , Liang Zhu , Lunhua He , Shun He , Xianying Qin , Chenglong Zhao , Feiyu Kang , Baohua Li
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引用次数: 10
Abstract
High-energy nickel-rich layered oxide cathodes are one kind of the promising materials to electric vehicles powered by lithium-ion batteries. However, grain boundary structure and chemistry disintegration show the most serious challenges for these cathodes at long-term cycles, particularly under extreme temperatures and high voltages. Herein, we present a sustainable synthesis route to achieve a uniform surface/interface-coating of nickel-rich layered oxide secondary particles as well as grain boundaries. The obtained cathodes demonstrate dramatically enhanced rate capability and cycling stability in a wide temperature range from −40 ℃ to 60 ℃ even charged to the high cut-off voltage of 4.5 V. Moreover, the cathodes display a high humidity tolerance with scarcely any sign of impurity after exposure to an atmosphere with 98% relative humidity. The highly dense and resistive fluorine- and cobalt-rich interphase structures can effectively protect the particles from the simultaneous degradation of surface structure and side reactions with electrolytes at cycling. This facile interfacial nanostructure is further demonstrated with lower interface energy, facilitating the lithium-ions transport with lower interface impedance and improved stability. Thereby, this synthesis perspectives provide the new insights of nickel-rich lithium cathodes at grain boundary dimensions.
期刊介绍:
Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem.
Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.