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A Novel Calcium‐Ion Battery Based on Dual‐Carbon Configuration with High Working Voltage and Long Cycling Life
Advanced Science ( IF 14.3 ) Pub Date : 2018-04-27 , DOI: 10.1002/advs.201701082
Shi Wu 1, 2 , Fan Zhang 1 , Yongbing Tang 1
Affiliation  

Rechargeable batteries based on multivalent cations (e.g., Mg2+ and Al3+) have attracted increased interest in recent years because of the merits of natural abundance, low cost, good chemical safety, and larger capacity. Among these batteries, the Ca‐ion battery (CIB) shows attractive priority because Ca2+ has the closest reduction potential (−2.87 V vs standard hydrogen electrode (SHE)), to that of Li (−3.04 V vs SHE), enabling a wide voltage window for the full battery. However, most Ca‐ion batteries have low working voltage (below 2 V), as well as poor cycling stability (less than 50 cycles). Here, a high‐performance Ca‐ion full battery with a novel dual‐carbon configuration design with low‐cost and environmentally friendly mesocarbon microbeads and expanded graphite as the anode and cathode, respectively, is reported. This Ca‐ion‐based dual‐carbon battery (Ca‐DCB) can work successfully in conventional carbonate electrolyte dissolving Ca(PF6)2, with a reversible discharge capacity of 66 mAh g−1 at a current rate of 2 C and a high working voltage of 4.6 V. Moreover, the Ca‐DCB exhibits good cycling stability with a discharge capacity of 62 mAh g−1 after 300 cycles with a high capacity retention of 94%, which is the best performance of the reported CIBs, suggesting it is a promising candidate for next‐generation energy storage devices.

中文翻译:

一种基于双碳结构的高工作电压、长循环寿命的新型钙离子电池

近年来,基于多价阳离子(例如Mg 2+和Al 3+ )的可充电电池由于天然丰富、成本低、化学安全性好和容量大等优点而引起了越来越多的兴趣。在这些电池中,钙离子电池(CIB)显示出有吸引力的优先性,因为Ca 2+具有最接近Li的还原电位(-2.87 V vs 标准氢电极(SHE))(-3.04 V vs SHE),使得整个电池的宽电压窗口。然而,大多数钙离子电池工作电压低(低于2V),循环稳定性差(少于50次循环)。本文报道了一种高性能钙离子全电池,采用新颖的双碳配置设计,以低成本且环保的中间相碳微珠和膨胀石墨分别作为阳极和阴极。这种钙离子基双碳电池(Ca-DCB)可以在溶解Ca(PF 6 ) 2的传统碳酸盐电解质中成功工作,在2 C电流倍率和100 mA电流下可逆放电容量为66 mAh g -1 。 4.6 V的高工作电压。此外,Ca-DCB表现出良好的循环稳定性,300次循环后放电容量为62 mAh g -1,容量保持率高达94%,这是已报道的CIB的最佳性能,这表明它是下一代储能设备的有前途的候选者。
更新日期:2018-04-27
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