Co-CoO/MnO Heterostructured Nanocrystals Anchored on N/P-Doped 3D Porous Graphene for High-Performance Pseudocapacitive Lithium Storage
Co-CoO/MnO Heterostructured Nanocrystals Anchored on N/P-Doped 3D Porous Graphene for High-Performance Pseudocapacitive Lithium Storage
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锚定在 N/P 掺杂 3D 多孔石墨烯上的 Co-CoO/MnO 异质结构纳米晶体用于高性能赝电容锂存储
DOI：
10.1149/2.1251915jes
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发表时间：
2019
影响因子：
3.9
通讯作者：
Zhang Peixin
中科院分区：
文献类型：
--
作者：
Chen Junning;Zhou Haohao;Chen Huanhui;An Bohan;Deng Libo;Li Yongliang;Sun Lingna;Ren Xiangzhong;Zhang Peixin
锂离子电池（LIB）由于其令人印象深刻的能量密度和低记忆效应而广泛用于许多应用中。然而，固有的扩散控制的锂存储限制了它们的高功率应用。在此，采用一种新型表面氧化还原电容性锂存储技术来提高锂离子电池阳极的倍率性能，该技术源于氮/磷共掺杂3D石墨烯网络和Co-CoO/MnO纳米颗粒（NPGCM）组成的混合物在循环过程中氧化物的深度氧化。表面赝电容与扩散相关的锂储存相结合，导致了非凡的倍率性能（0.2 A g− 1时为1170.7 mAh g− 1，6 A g− 1时为258.3 mAh g− 1）。此外，NPGCM混合物表现出优异的循环稳定性，在4 A g− 1下循环1300次后，容量为397 mAh g− 1。电子显微镜和光谱研究表明，赝电容源于循环过程中产生的Mn 3 O 4.
Lithium ion batteries (LIBs) are extensively used in numerous applications due to their impressive energy density and low memory effect. However, the inherently diffusion-controlled lithium storage limits their high-power applications. Herein, a novel surface redox capacitive lithium storage which originates from the deep oxidation of oxides during cycling of a hybrid consisting of nitrogen/phosphorous co-doped 3D graphene networks and Co-CoO/MnO nanoparticles (NPGCM), was employed to enhance the rate performance of anode for Li-ion batteries. The combination of surface pseudocapacitance with the diffusion-related lithium storage led to an extraordinary rate capability (1170.7 mAh g− 1 at 0.2 A g− 1 and 258.3 mAh g− 1 at 6 A g− 1). Furthermore, the NPGCM hybrid exhibited excellent cyclic stability, showing a capacity of 397 mAh g− 1 after 1300 cycles at 4 A g− 1. Electron microscopy and spectroscopic investigations suggested the pseudocapacitance is originated from Mn 3 O 4 generated during cycling.
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