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Black Phosphorus Quantum Dot/Ti 3 C 2 MXene Nanosheet Composites for Efficient Electrochemical Lithium/Sodium‐Ion Storage
Author(s) -
Meng Ruijin,
Huang Jimei,
Feng Yutong,
Zu Lianhai,
Peng Chengxin,
Zheng Lirong,
Zheng Lei,
Chen Zhibin,
Liu Guanglei,
Chen Bingjie,
Mi Yongli,
Yang Jinhu
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201801514
Subject(s) - materials science , anode , nanosheet , energy storage , electrode , electrochemistry , battery (electricity) , composite number , lithium (medication) , sodium ion battery , quantum dot , x ray photoelectron spectroscopy , chemical engineering , nanotechnology , composite material , faraday efficiency , medicine , power (physics) , chemistry , physics , engineering , quantum mechanics , endocrinology
The exploration of new and efficient energy storage mechanisms through nanostructured electrode design is crucial for the development of high‐performance rechargeable batteries. Herein, black phosphorus quantum dots (BPQDs) and Ti 3 C 2 nanosheets (TNSs) are employed as battery and pseudocapacitive components, respectively, to construct BPQD/TNS composite anodes with a novel battery‐capacitive dual‐model energy storage (DMES) mechanism for lithium‐ion and sodium‐ion batteries. Specifically, as a battery‐type component, BPQDs anchored on the TNSs are endowed with improved conductivity and relieved stress upon cycling, enabling a high‐capacity and stable energy storage. Meanwhile, the pseudocapacitive TNS component with further atomic charge polarization induced by POTi interfacial bonds between the two components allows enhanced charge adsorption and efficient interfacial electron transfer, contributing a higher pseudocapacitive value and fast energy storage. The DMES mechanism is evidenced by substantial characterizations of X‐ray photoelectron spectroscopy and X‐ray absorption fine structure spectroscopy, density functional theory calculations, and kinetics analyses. Consequently, the composite electrode exhibits superior battery performance, especially for lithium storage, such as high capacity (910 mAh g −1 at 100 mA g −1 ), long cycling stability (2400 cycles with a capacity retention over 100%), and high rate capability, representing the best comprehensive battery performance in BP‐based anodes to date.