ABSTRACT Although sodium‐ion batteries (SIBs) hold significant potential for large‐scale energy storage applications, their commercialization is hindered by limited cycle life and insufficient energy density. Herein, we report a BiSb 3 alloy SIBs anode material, wherein BiSb 3 NPs are embedded within nitrogen‐doped carbon multichannel nanofibers (BiSb 3 NMCCNFs), exhibiting ultra‐long cycling stability. Specifically, the uniform dispersion of BiSb 3 nanoparticles within the carbon matrix effectively suppresses volume expansion and particle agglomeration during the desodiation/sodiation processes, thereby achieving high‐capacity retention (313.3 mAh g −1 after 800 cycles at 1 A g −1 ). Moreover, the BiSb 3 NMCCNFs electrode exhibited pseudocapacitive‐dominant behavior, enabling exceptional rate capability (274.4 mAh g −1 at 10 A g −1 ). Critically, the BiSb 3 NMCCNFs //NVP full cell maintains a reversible capacity of 172.9 mAh g −1 after 1000 cycles at 1 A g −1 , alongside outstanding rate performance. The sodium storage mechanism was identified as a two‐step reversible alloying reaction of “BiSb→ Na(BiSb)→Na 3 (BiSb)” through in situ XRD and ex situ TEM characterization, further verifying the stability of the material structure. This work presents a facile structural design strategy for high‐performance alloy anodes, addressing key challenges in the application pathway of SIBs.
Zhang et al. (Thu,) studied this question.