Micelle-directed self-assembly of single-crystal-like mesoporous stoichiometric oxides for high-performance lithium storage  

作　　者：Yanhua Wan Changyao Wang Xingmiao Zhang Yang Yin Mengmeng Liu Bing Ma Linlin Duan Yuzhu Ma Wei Zhang Changlin Zheng Dongliang Chao Fei Wang Yongyao Xia Wei Li 

机构地区：[1]Department of Chemistry,Laboratory of Advanced Materials,Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,State Key Laboratory of Molecular Engineering of Polymers,College of Chemistry and Materials Science,Fudan University,Shanghai 200433,China [2]State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China

出　　处：《National Science Review》2024年第4期189-199,共11页国家科学评论（英文版）

基　　金：This work was supported by the National Key R&D Program of China(2022YFA1503501 and 2022YFA1504103);the National Natural Science Foundation of China(22088101,62171136 and U21A20329);the Program of Shanghai Academic Research Leader(21XD1420800);the Shanghai Pilot Program for Basic Research-Fudan University(21TQ1400100 and 21TQ008);the Shanghai International Science and Technology Partnership Project(23520750400).

摘　　要：Due to their uncontrollable assembly and crystallization process,the synthesis of mesoporous metal oxide single crystals remains a formidable challenge.Herein,we report the synthesis of single-crystal-like mesoporous Li_(2)TiSiO_(5) by using soft micelles as templates.The key lies in the atomic-scale self-assembly and step-crystallization processes,which ensure the formation of single-crystal-like mesoporous Li_(2)TiSiO_(5) microparticles via an oriented attachment growth mechanism under the confinement of an in-situ formed carbon matrix.The mesoporous Li_(2)TiSiO_(5) anode achieves a superior rate capability(148 mAh g^(−1) at 5.0 A g^(−1))and outstanding long-term cycling stability(138 mAh g^(−1) after 3000 cycles at 2.0 A g^(−1))for lithium storage as a result of the ultrafast Li+diffusion caused by penetrating mesochannels and nanosized crystal frameworks(5–10 nm).In comparison,bulk Li_(2)TiSiO_(5) exhibits poor rate capability and cycle performance due to micron-scale diffusion lengths.This method is very simple and reproducible,heralding a new way of designing and synthesizing mesoporous single crystals with controllable frameworks and chemical functionalities.

关 键 词：mesoporous materials micelles single-crystal-like Li_(2)TiSiO_(5) lithium-ion batteries 

分 类 号：O648[理学—物理化学]