Ever-Increasing Pseudocapacitance in RGO-MnO-RGO Sandwich Nanostructures for Ultrahigh-Rate Lithium Storage
Ever-Increasing Pseudocapacitance in RGO-MnO-RGO Sandwich Nanostructures for Ultrahigh-Rate Lithium Storage
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用于超高倍率锂存储的 RGO-MnO-RGO 三明治纳米结构中不断增加的赝电容
DOI：
10.1002/adfm.201504849
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发表时间：
2016
影响因子：
19
通讯作者：
Dou Shixue
中科院分区：
文献类型：
--
作者：
Yuan Tianzhi;Jiang Yinzhu;Sun Wenping;Xiang Bo;Li Yong;Yan Mi;Xu Ben;Dou Shixue
锂离子电池因其高能量密度而在商业化方面取得了巨大成功。然而，由于电极本身的扩散控制锂存储，相对延迟的放电/充电严重阻碍了它们的高功率应用。该研究表明，在新型RGO-MnO-RGO夹层纳米结构中，循环过程中独特的微观结构演变产生了不断增加的表面氧化还原电容性锂存储。这种表面伪电容与扩散控制的锂存储动态平衡，从而实现了前所未有的倍率能力（在40 A g - 1下331.9 mAh g - 1，在15 A g - 1下4000次循环后379 mAh g - 1），并具有出色的循环稳定性。电极表面和扩散锂存储的动态结合可能为设计高功率锂离子电池开辟可能性。
Lithium ion batteries have attained great success in commercialization owing to their high energy density. However, the relatively delaying discharge/charge severely hinders their high power applications due to intrinsically diffusion‐controlled lithium storage of the electrode. This study demonstrates an ever‐increasing surface redox capacitive lithium storage originating from an unique microstructure evolution during cycling in a novel RGO–MnO–RGO sandwich nanostructure. Such surface pseudocapacitance is dynamically in equilibrium with diffusion‐controlled lithium storage, thereby achieving an unprecedented rate capability (331.9 mAh g−1at 40 A g−1, 379 mAh g−1after 4000 cycles at 15 A g−1) with outstanding cycle stability. The dynamic combination of surface and diffusion lithium storage of electrodes might open up possibilities for designing high‐power lithium ion batteries.