An in-situ generated Bi-based sodiophilic substrate with high structural stability for high-performance sodium metal batteries  

作　　者：Lulu Li Ming Zhu Guanyao Wang Fangfang Yu Liaoyong Wen Hua-Kun Liu Shi-Xue Dou Chao Wu 

机构地区：[1]School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China [2]Institute for Superconducting&Electronic Materials,Australian Institute of Innovative Materials,University of Wollongong,NSW,2522,Australia [3]Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province,School of Engineering,Westlake University,Hangzhou 310024,Zhejiang,China

出　　处：《Journal of Energy Chemistry》2022年第8期595-603,I0016,共10页能源化学（英文版）

基　　金：the support from the National Natural Science Foundation of China(22179079 and 52101264);the Science and Technology Commission of Shanghai Municipality(20010500400);the Westlake Education Foundation。

摘　　要：Sodium(Na)metal anode exhibits a potential candidate in next-generation rechargeable batteries owing to its advantages of high earth abundance and low cost.Unfortunately,the practical development of sodium metal batteries is inherently plagued by challenges such as the side reactions and the growth of Na dendrites.Herein we report a highly stable Bi-based“sodiophilic”substrate to stabilize Na anode,which is created by in-situ electrochemical reactions of 3D hierarchical porous Bi_(2)MoO_(6)(BMO)microspheres.BMO is initially transformed into the Bi“nanoseeds”embedded in the Na-Mo-O matrix.Subsequently,the Bi nanoseeds working as preferential nucleation sites through the formation of BiNa alloy enable the non-dendritic Na deposition.The asymmetric cells based on such BMO-based substrate can deliver a long-term cycling for 600 cycles at a large capacity of 4 m Ah cm^(-2) and for 800 cycles at a high current density of 10 m A cm^(-2).Even at a high depth of discharge(66.67%),the Na-predeposited BMO(Na@BMO)electrodes can cycle for more than 1600 h.The limited Na@BMO anodes coupled with the Na_(3)V_(2)(PO_(4))_(3) cathodes(N/P ratio of 3)in full cells also show excellent electrochemical performance with a capacity retention of about 97.4%after 1100 cycles at 2 C.

关 键 词：Sodium metal anode Bi_(2)MoO_(6)microspheres Sodiophilic substrate Conversion and alloying reaction Uniform sodium deposition 

分 类 号：TM912[电气工程—电力电子与电力传动]