Nitrogen-Doped Multiwall Carbon Nanotubes for Lithium Storage with Extremely High Capacity

• DOI: 10.1021/nl3000908
• Publication Date: 2012-03-27T15:04:46Z
• Authors: Weon Ho Shin; Hyung Mo Jeong; Byung Gon Kim; Jeung Ku Kang; Jang Wook Choi
• Keywords: Carbon fibers; Nanomaterials

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 batteries and supercapacitors, designed for taking advantages both types systems. Herein, as quest to improve the Li capability compared that other existing carbon nanomaterials, we developed extrinsically defective multiwall nanotubes by nitrogen-doping. Nitrogen-doped contain wall defects through which ions can diffuse so occupy large portion interwall space regions. Furthermore, when integrated with 3 nm nickel oxide nanoparticles further capacity boost, nitrogen doping enables unprecedented cell engaging anomalous electrochemical phenomena such division into even smaller ones, their agglomeration-free diffusion nitrogen-doped sites well rise cycles. final cells exhibit 3500 mAh/g, cycle life greater than 10,000 times, discharge rate 1.5 min while retaining 350 mAh/g.