Cathode Material with Nanorod Structure鈥擜n Application for Advanced High-Energy and Safe Lithium Batteries

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• 作者：Hyung-Joo Noh ; Zonghai Chen ; Chong S. Yoon ; Jun Lu ; Khalil Amine ; Yang-Kook Sun
• 刊名：Chemistry of Materials
• 出版年：2013
• 出版时间：May 28, 2013
• 年：2013
• 卷：25
• 期：10
• 页码：2109-2115
• 全文大小：492K
• 年卷期：v.25,no.10(May 28, 2013)
• ISSN：1520-5002

文摘

We have developed a novel cathode material based on lithium鈥搉ickel鈥搈anganese鈥揷obalt oxide, where the manganese concentration remains constant throughout the particle, while the nickel concentration decreases linearly and the cobalt concentration increases from the center to the outer surface of the particle. This full concentration gradient material with a fixed manganese composition (FCG鈥揗n-F) has an average composition of Li[Ni_0.60Co_0.15Mn_0.25]O₂ and is composed of rod-shaped primary particles whose length reaches 2.5 渭m, growing in the radial direction. In cell tests, the FCG鈥揗n-F material delivered a high capacity of 206 mAh g^鈥? with excellent capacity retention of 70.3% after 1000 cycles at 55 掳C. This cathode material also exhibited outstanding rate capability, good low-temperature performance, and excellent safety, compared to a conventional cathode having the same composition (Li[Ni_0.60Co_0.15Mn_0.25]O₂), where the concentration of the metals is constant across the particles.

Keywords:

coprecipitation; nanorod; concentration gradient; cathode; lithium batteries