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[资源] Nature Materials最新研究文章：用于先进锂电池的纳米结构高能电极材料

最新一期的Nature Materials刊发了韩国和美国科学家合作发表的最新研究文章，介绍了镍基高能电极材料在锂电池中的应用。研究锂电正极材料的朋友可以读一下。附件为正文和Supporting Information。

Nickel-rich layered lithium transition-metal oxides, LiNi1−xMxO2 (M = transition metal), have been under intense investigation as high-energy cathode materials for rechargeable lithium batteries because of their high specific capacity and relatively low cost. However, the commercial deployment of nickel-rich oxides has been severely hindered by their intrinsic poor thermal stability at the fully charged state and insufficient cycle life, especially at elevated temperatures. Here, we report a nickel-rich lithium transition-metal oxide with a very high capacity (215 mA h g−1), where the nickel concentration decreases linearly whereas the manganese concentration increases linearly from the centre to the outer layer of each particle. Using this nano-functional full-gradient approach, we are able to harness the high energy density of the nickel-rich core and the high thermal stability and long life of the manganese-rich outer layers. Moreover, the micrometre-size secondary particles of this cathode material are composed of aligned needle-like nanosize primary particles, resulting in a high rate capability. The experimental results suggest that this nano-functional full-gradient cathode material is promising for applications that require high energy, long calendar life and excellent abuse tolerance such as electric vehicles.

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[ 来自科研家族材料家族 ]

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附件 1 : Nanostructuredhigh-energycathodematerialsforadvancedlithiumbatteries.pdf

2012-10-27 18:19:19, 1.25 M