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×îÐÂÒ»ÆÚµÄNature Materials¿¯·¢Á˺«¹úºÍÃÀ¹ú¿ÆÑ§¼ÒºÏ×÷·¢±íµÄ×îÐÂÑо¿ÎÄÕ£¬½éÉÜÁËÄø»ù¸ßÄܵ缫²ÄÁÏÔÚï®µç³ØÖеÄÓ¦Óá£Ñо¿ï®µçÕý¼«²ÄÁϵÄÅóÓÑ¿ÉÒÔ¶Áһϡ£¸½¼þΪÕýÎĺÍSupporting 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. . nmat3435-f1.jpg nmat3435-f2.jpg nmat3435-f3.jpg nmat3435-f4.jpg nmat3435-f5.jpg [ À´×Ô¿ÆÑмÒ×å ²ÄÁϼÒ×å ] |
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