材料科学
锂(药物)
化学工程
石墨烯
碱金属
纳米技术
储能
离子
无机化学
电极
物理化学
有机化学
化学
医学
物理
工程类
内分泌学
功率(物理)
量子力学
作者
Boya Wang,Zhiwen Deng,Yuting Xia,Jiaxuan Hu,Hongju Li,Hao Wu,Qiaobao Zhang,Yun Zhang,Huan Liu,Shi Xue Dou
标识
DOI:10.1002/aenm.201903119
摘要
Abstract Finding suitable electrode materials for alkali‐metal‐ion storage is vital to the next‐generation energy‐storage technologies. Polyantimonic acid (PAA, H 2 Sb 2 O 6 · n H 2 O), having pentavalent antimony species and an interconnected tunnel‐like pyrochlore crystal framework, is a promising high‐capacity energy‐storage material. Fabricating electrochemically reversible PAA electrode materials for alkali‐metal‐ion storage is a challenge and has never been reported due to the extremely poor intrinsic electronic conductivity of PAA associated with the highest oxidation state Sb(V). Combining nanostructure engineering with a conductive‐network construction strategy, here is reported a facile one‐pot synthesis protocol for crafting uniform internal‐void‐containing PAA nano‐octahedra in a composite with nitrogen‐doped reduced graphene oxide nanosheets (PAA⊂N‐RGO), and for the first time, realizing the reversible storage of both Li + and K + ions in PAA⊂N‐RGO. Such an architecture, as validated by theoretical calculations and ex/in situ experiments, not only fully takes advantage of the large‐sized tunnel transport pathways (0.37 nm 2 ) of PAA for fast solid‐phase ionic diffusion but also leads to exponentially increased electrical conductivity (3.3 S cm −1 in PAA⊂N‐RGO vs 4.8 × 10 −10 S cm −1 in bare‐PAA) and yields an inside‐out buffer function for accommodating volume expansion. Compared to electrochemically irreversible bare‐PAA, PAA⊂N‐RGO manifests reversible conversion‐alloying of Sb(V) toward fast and durable Li + ‐ and K + ‐ion storage.
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