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论文类型：期刊论文

发表时间：2016-09-01

发表刊物：ELECTROCHIMICA ACTA

收录刊物：SCIE、EI、Scopus

卷号：211

页面范围：619-626

ISSN号：0013-4686

关键字：natrochalcite; anode; conversion electrode; sodium ion battery; lithium ion battery

摘要：Here we report the evaluation of natrochalcite (Na[Cu-2(OH)(H2O)(SO4)(2)]), an anionic layered structure [Cu-2(OH)(H2O)(SO4)(2)] charge-balanced by Na+, as an anode material for both Li- and Na-ion batteries. It delivers 224 mAh/g and 175 mAh/g in the first discharge in the Li+- and Na+-cells respectively, and decomposes to form amorphous matrixes during this step. In the subsequent charge, the original layered structure is unusually partially recrystallized back from the matrixes, resulting in 53 mAh/g and 35 mAh/g discharge capacities in the second discharge respectively. In subsequent cycling, Li+ in the electrolyte is found to replace the original Na+ during cycling in the Li+-cell and the electrode in the Li+-cell demonstrates better capacity retention rates than that in the Na+-cell, possibly due to Li+ being smaller than Na+ and thus decomposition-recrystallization cycles being more reversible during cycling in the Li+-cell. (C) 2016 Elsevier Ltd. All rights reserved.