Layer-controlled 2D Sn_(4)P_(3) via space-confined topochemical transformation for enhanced lithium cycling performance  

作　　者：Jianan Gu Yongzheng Zhang Bingbing Fan Yanlong Lv Yanhong Wang Ruohan Yu Meicheng Li 

机构地区：[1]State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of New Energy, North China Electric Power University, Beijing, 100096, China [2]State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China [3]Wuhan University of Technology, Sanya, 572000, China

出　　处：《Nano Research》2024年第11期9697-9703,共7页纳米研究（英文版）

基　　金：supported partially by project of the National Natural Science Foundation of China(Nos.52102203 and 51972110);Beijing Science and Technology Project(No.Z211100004621010);Beijing Natural Science Foundation(No.2222076);State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(No.LAPS202114);Huaneng Group Headquarters Science and Technology Project(No.HNKJ20-H88);2022 Strategic Research Key Project of Science and Technology Commission of the Ministry of Education,the Fundamental Research Funds for the Central Universities(No.2024MS082);the NCEPU “Double First- Class” Program.

摘　　要：Topochemical transformation has emerged as a promising method for fabricating two-dimensional (2D) materials with precise control over their composition and morphology. However, the large-scale synthesis of ultrathin 2D materials with controllable thickness remains a tremendous challenge. Herein, we adopt an efficient topochemical synthesis strategy, employing a confined reaction space to fabricate ultrathin 2D Sn_(4)P_(3) nanosheets in large-scale. By carefully adjusting the rolling number during the processing of Sn/Al foils, we have successfully fabricated Sn_(4)P_(3) nanosheets with varied layer thicknesses, achieving a remarkable minimum thickness of two layers (~ 2.2 nm). Remarkably, the bilayer Sn_(4)P_(3) nanosheets display an exceptional initial capacity of 1088 mAh·g^(−1), nearing the theoretical value of 1230 mAh·g^(−1). Furthermore, we reveal their high-rate property as well as outstanding cyclic stability, maintaining capacity without fading more than 3000 cycles. By precisely controlling the layer thickness and ensuring nanoscale uniformity, we enhance the lithium cycling performance of Sn_(4)P_(3), marking a significant advancement in developing high-performance energy storage systems.

关 键 词：topochemical transformation 2D materials confined reaction layer-controlled Sn_(4)P_(3)nanosheets lithium storage 

分 类 号：TB383[一般工业技术—材料科学与工程]