Synthesis design of interfacial nanostructure for nickel-rich layered cathodes

IF 16.8 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
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.

富镍层状阴极界面纳米结构的合成与设计
高能富镍层状氧化物阴极是锂离子电池驱动电动汽车的一种极具发展前景的材料。然而,晶界结构和化学分解是这些阴极在长期循环,特别是在极端温度和高压下面临的最严峻挑战。在此,我们提出了一种可持续的合成路线,以实现富镍层状氧化物二次颗粒和晶界的均匀表面/界面涂层。所制备的阴极在−40℃至60℃的宽温度范围内,即使充电到4.5 V的高截止电压,也具有显著增强的倍率能力和循环稳定性。此外,阴极在暴露于相对湿度为98%的大气后,几乎没有任何杂质的迹象,显示出很高的湿度耐受性。高密度的富氟和富钴相间结构可以有效地保护颗粒免受表面结构的同时降解和循环时与电解质的副反应。进一步证明了这种易于操作的界面纳米结构具有较低的界面能量,有利于锂离子的传输,具有较低的界面阻抗和提高的稳定性。因此,这一合成视角为富镍锂阴极的晶界研究提供了新的视角。
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来源期刊
Nano Energy
Nano Energy CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
30.30
自引率
7.40%
发文量
1207
审稿时长
23 days
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.
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