材料科学
电解质
阳极
阴极
化学工程
离子电导率
复合数
电极
聚合
聚合物
复合材料
纳米技术
电气工程
工程类
物理化学
化学
作者
Yu Yao,Zhenyao Wei,Haiyun Wang,Huijuan Huang,Yu Jiang,Xiaojun Wu,Xiayin Yao,Zhong‐Shuai Wu,Yan Yu
标识
DOI:10.1002/aenm.201903698
摘要
Abstract All solid‐state sodium batteries (ASSBs) have attracted considerable attention due to their enhanced safety, long lifespan, and high energy density. However, several challenges have plagued the development of ASSBs, especially the relatively low ionic conductivity of solid‐state electrolytes (SSEs), large interfacial resistance, and low stability/compatibility between SSEs and electrodes. Here, a high‐performance all solid‐state sodium battery (NVP@C|PEGDMA‐NaFSI‐SPE|Na) is designed by employing carbon coated Na 3 V 2 (PO 4 ) 3 composite nanosheets (NVP@C) as the cathode, solvent‐free solid polymer electrolyte (PEGDMA‐NaFSI‐SPE) as the electrolyte and metallic sodium as the anode. The integrated electrolyte and cathode system prepared by the in situ polymerization process exhibits high ionic conductivity (≈10 −4 S cm −1 at room temperature) and an outstanding electrolyte/electrode interface. Benefiting from these merits, the soft‐pack ASSB (NVP@C|PEGDMA‐NaFSI‐SPE|Na) delivers excellent cycling life over 740 cycles (capacity decay of only 0.007% per cycle) and maintains 95% of the initial reversible capacity with almost no self‐discharge even after resting for 3 months. Moreover, the bendable ASSB exhibits a high capacity of 106 mAh g −1 (corresponds to energy density of ≈355 Wh kg −1 ) at 0.5 C despite undergoing repeated bending for 535 cycles. This work offers a new strategy to fabricate high‐performance flexible ASSBs with a long lifespan and excellent flexibility.
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