Synthesis and electrode performance of carbon coated Na2FePO4F for rechargeable Na batteries |
| |
Authors: | Yoshiteru Kawabe Naoaki Yabuuchi Masataka Kajiyama Norihito Fukuhara Tokuo Inamasu Ryoichi Okuyama Izumi Nakai Shinichi Komaba |
| |
Institution: | aDepartment of Applied Chemistry, Tokyo University of Science, 1–3 Kagurazaka, Shinjuku, Tokyo 162–8601, Japan;bR&D Center, GS Yuasa International Ltd., Minami-ku, Kyoto 601–8520, Japan |
| |
Abstract: | Carbon-coated Na2FePO4F is synthesized by a simple solid-state method with ascorbic acid as carbon source. Structural characterization of Na2FePO4F by synchrotron X-ray diffraction, scanning/transmission electron microscopy, and Raman spectroscopy reveals that ascorbic acid effectively suppresses the particle growth of Na2FePO4F, forming the nano-sized carbon coated materials. Electrode performance of Na2FePO4F for rechargeable sodium batteries is also examined. The carbon-coated Na2FePO4F sample (1.3 wt% carbon) delivers initial discharge capacity of 110 mAh g-1 at a rate of 1/20 C (6.2 mA g-1) with well-defined voltage plateaus at 3.06 and 2.91 V vs. Na metal. The sample also shows acceptable capacity retention and rate capability as the positive electrode materials for rechargeable Na batteries, which is operable at room temperature. |
| |
Keywords: | Na battery Sodium insertion |
本文献已被 ScienceDirect 等数据库收录! |
|