Metal-free boron-doped carbon microspheres as excellent cathode catalyst for rechargeable Li–O2 battery
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- 作者：Wei Meng ; Lina Wen ; Zhonghai Song ; Ning Cao…
- 关键词：Boron ; doped carbon microspheres ; Air cathode ; Li–O2 battery
- 刊名：Journal of Solid State Electrochemistry
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：21
- 期：3
- 页码：665-671
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Physical Chemistry; Electrochemistry; Energy Storage; Characterization and Evaluation of Materials; Analytical Chemistry; Condensed Matter Physics;
- 出版者：Springer Berlin Heidelberg
- ISSN：1433-0768
- 卷排序：21
文摘
Rechargeable Li–O2 batteries are attracting more and more interest due to their high energy density. Meanwhile, the replacement of high-cost and scarce precious-metal catalysts has attracted more and more attention. Currently, many academic researchers have paid attention to find highly efficient metal-free catalysts as air cathode material. Herein, the boron-doped carbon microspheres (B-CMs) were prepared through a novel and facile static calcination method and showed high electrocatalytic activity as a cathode material. The battery with a B-CM cathode delivered a high initial discharge capacity of 13,757.2 mAh g−1 and outstanding coulombic efficiency of 90.1 % at 100 mA g−1. In addition, stable cyclability (151 cycles with stable discharge voltage of ~2.60 V with a cutoff capacity of 1000 mAh g−1 at 200 mA g−1) has been exhibited. These performances are due to three main points: boron carbide compound changed the surface area of the CMs and formed the mesopore architectures as well as the large surface area of 683.738 m2 g−1; the reduce of boron atom can slow down the oxidation of the CMs during the cyclings; and finally, the electron-deficient boron atom introduction greatly facilitated Li+ diffusion and electrolyte immersion and enhanced the oxygen reduction and evolution reaction kinetics.