材料科学
钠离子电池
电池(电)
钠
化学工程
阴极
离子
容量损失
复合数
储能
阳极
复合材料
电极
冶金
化学
有机化学
工程类
法拉第效率
物理
物理化学
功率(物理)
量子力学
作者
Xuanpeng Wang,Chenyang Wang,Kang Han,Chaojiang Niu,Jiashen Meng,Ping Hu,Xiaoming Xu,Zhaoyang Wang,Qi Li,Chunhua Han,Yunhui Huang,Liqiang Mai
标识
DOI:10.1002/aenm.201802180
摘要
Abstract Searching for new‐type cathodes to enhance the capacity of Na‐ion batteries is one of the hot spots in energy storage systems. Many sodium insertion transition metal oxides, i.e., Na‐Mn‐O compounds, are intensively studied owing to their high voltage, abundant resources, and low toxicity. However, its relatively low capacity greatly limits its application. Here, a new synergistic composite, 0.44Na 4 Mn 2 O 5 •0.56Na 0.7 MnO 2 , is developed by a feasible method of organic‐acid‐assisted drying and heat treatment. This synergistic composite cathode delivers a reversible sodium storage capacity as high as 278.0 mAh g −1 and stable framework structure due to the synergistic effect. It is achieved by the synergistic effect of high capacity Na 4 Mn 2 O 5 with multiple Na + ions insert/extract sites and stable Na 0.7 MnO 2 with layered structure. Even when tested at a high mass loading of 7.42 mg cm −2 , this composite cathode demonstrates stable cycling over 400 cycles for sodium storage. Moreover, when coupled with hard carbon anode, Na‐ion full battery delivers excellent charge/discharge performance with capacity retention of 84.0%, showing great application potential in the large‐scale energy storage field.
科研通智能强力驱动
Strongly Powered by AbleSci AI