Coal-based carbon anodes for high-performance potassium-ion batteries
Coal-based carbon anodes for high-performance potassium-ion batteries
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用于高性能钾离子电池的煤基碳阳极
DOI：
10.1016/j.carbon.2019.03.020
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发表时间：
2019-06-01
期刊：
影响因子：
10.9
通讯作者：
Qiu, Jieshan
中科院分区：
文献类型：
--
作者：
Xiao, Nan;Zhang, Xiaoyu;Qiu, Jieshan
钾离子电池（PIB）被认为是大规模固定能量存储中锂离子电池的可行替代品。然而，低成本、高倍率和长寿命的阳极仍然是PIB商业化的巨大挑战。本文以廉价、资源丰富的煤为原料，通过球磨、酸洗、氧化、炭化等工艺，成功制备了高性能的PIB用炭阳极。研究发现，煤基炭的储钾性能与煤的变质程度密切相关。中阶烟煤基炭阳极在0. 05 A-g（-1）下具有260 mAh-g（-1）的高可逆容量，在1A-g（-1）下循环1200次后仍保持118 mAh-g（-1）。此外，在0.1、0.5和5.0 A g（-1）的较高电流密度下，其分别保持230、176和88 mA h g（-1）的高存储容量。低成本、高性能的煤基炭阳极有望促进煤基炭阳极的大规模应用。(C)2019由Elsevier Ltd.出版
Potassium-ion batteries (PIBs) are considered as a viable alternative to lithium-ion batteries in large scale stationary energy storage. However, the low cost, high rate and long life anode still remains great challenge for the commercialization of PIBs. Herein, high performance carbon anodes for PIBs have been successfully prepared from low-cost and abundant coal through ball-milling, acid washing, oxidation and carbonization. We discover that the potassium storage performances of coal-based carbons are closely related to the coal rank. A middle-rank bituminous coal-based carbon anode delivers a high reversible capacity of 260 mAh g(-1) at 0.05 A g(-1) and maintains 118 mAh g(-1) after 1200 cycles at 1 A g(-1). Moreover, at higher current densities of 0.1, 0.5, and 5.0 A g(-1), it maintains high storage capacities of 230, 176, and 88 mA h g(-1), respectively. The low cost and high performance coal-based carbon anodes are supposed to accelerate the development of PIBs toward future large-scale applications. (C) 2019 Published by Elsevier Ltd.