Nitrogen-Doped Multiwall Carbon Nanotubes for Lithium Storage with Extremely High Capacity
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- 作者：Weon Ho Shin ; Hyung Mo Jeong ; Byung Gon Kim ; Jeung Ku Kang ; Jang Wook Choi
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：May 9, 2012
- 年：2012
- 卷：12
- 期：5
- 页码：2283-2288
- 全文大小：467K
- 年卷期：v.12,no.5(May 9, 2012)
- ISSN：1530-6992
文摘
The increasing demands on high performance energy storage systems have raised a new class of devices, so-called lithium ion capacitors (LICs). As its name says, LIC is an intermediate system between lithium ion batteries and supercapacitors, designed for taking advantages of both types of energy storage systems. Herein, as a quest to improve the Li storage capability compared to that of other existing carbon nanomaterials, we have developed extrinsically defective multiwall carbon nanotubes by nitrogen-doping. Nitrogen-doped carbon nanotubes contain wall defects through which lithium ions can diffuse so as to occupy a large portion of the interwall space as storage regions. Furthermore, when integrated with 3 nm nickel oxide nanoparticles for a further capacity boost, nitrogen doping enables unprecedented cell performance by engaging anomalous electrochemical phenomena such as nanoparticles division into even smaller ones, their agglomeration-free diffusion between nitrogen-doped sites as well as capacity rise with cycles. The final cells exhibit a capacity as high as 3500 mAh/g, a cycle life of greater than 10鈥?00 times, and a discharge rate capability of 1.5 min while retaining a capacity of 350 mAh/g.