Reversible Copper Cathode for Nonaqueous Dual‐Ion Batteries
Reversible Copper Cathode for Nonaqueous Dual‐Ion Batteries
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非水双离子电池可逆铜阴极
DOI：
10.1002/anie.202212191
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Ji, Xiulei
中科院分区：
文献类型：
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作者：
Yu, Mingliang;Sui, Yiming;Sandstrom, Sean K.;Wu, Che‐Yu;Yang, Hao;Stickle, William;Luo, Wei;Ji, Xiulei
大多数报道的非水双离子电池（DIBs）的阴极通过插入反应吸收阴离子。为了提高电池的能量密度，有必要探索新的阴极化学方法。迄今为止，过渡金属尚未研究非水dib，尽管它们可能在阳极转化反应中提供高容量。在这里，我们报告了大块铜粉在3.2 V vs. Li+/Li下具有762 mAh g−1at的高可逆容量，并且在普通有机电解质中具有相对稳定的循环。铜电极的操作与阴离子载流子的转移相耦合。阴离子交换膜分离器用于防止Cu2+从阴极一侧穿过阳极一侧。我们设计了一种不平衡电解质，其阳极电解质比阴极电解质浓度更高。这解决了充电过程中随之而来的浓度过电位，促进了高比容量和增强的可逆性。这一发现为高能dib的研究提供了一个有希望的方向。
Most reported cathodes of nonaqueous dual‐ion batteries (DIBs) host anions via insertion reactions. It is necessary to explore new cathode chemistry to increase the battery energy density. To date, transition metals have yet to be investigated for nonaqueous DIBs, albeit they may offer high capacity in anodic conversion reactions. Here, we report that bulk copper powder exhibits a high reversible capacity of 762 mAh g−1at 3.2 V vs. Li+/Li and relatively stable cycling in common organic electrolytes. The operation of the copper electrode is coupled with the transfer of anion charge carriers. An anion exchange membrane separator is employed to prevent Cu2+from crossing from the catholyte to the anode side. We designed an unbalanced electrolyte with a more concentrated anolyte than a catholyte. This addresses the concentration overpotential ensued during charge and facilitates the high specific capacity and enhanced reversibility. This finding provides a promising direction for high‐energy DIBs.