Feng Yao, Zhang Sufeng, Zhang Ying, Ding Hao, Deng Jie, Salami-Kalajahi Mehdi, Chen Ningxin, Wang Zhaohui
Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Shaanxi University of Science and Technology, Xi'an 710021, China; College of Materials Science and Engineering, Hunan University, Changsha 410082, China.
Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Shaanxi University of Science and Technology, Xi'an 710021, China.
Carbohydr Polym. 2025 Nov 15;368(Pt 2):124181. doi: 10.1016/j.carbpol.2025.124181. Epub 2025 Aug 6.
Lithium metal is recognized as a leading candidate for anodes in next-generation high-energy-density batteries. However, challenges such as Li dendrite growth and instability of the solid electrolyte interface (SEI) persist. Conventional artificial interface construction via coating often diminished effectiveness due to binders reducing activity. Herein, this study utilized nanofibrillar cellulose as a one-dimensional template to construct a nanocellulose-based flexible, ultrathin (≈1 μm), lithophilic SnS nanopaper as an interlayer for separators. This innovative interlayer possesses self-supporting properties and mechanical flexibility while eliminating the need for activity-reducing binders. The uniform mesoporous structure of nanocellulose substrate ensures consistent lithium-ion flux, enhancing electrochemical stability. Within this framework, SnS spontaneously forms a continuous SEI layer on the lithium anode surface, primarily consisting of LiS and LiSn. This SEI layer, distinguished by its high ionic conductivity and excellent lithophilicity, significantly reduces nucleation overpotential and facilitates homogeneous lithium plating and stripping. Therefore, symmetric cells equipped with the SnS nanopaper interlayer demonstrate exceptional durability, sustaining operation for over 1400 h at 1 mA cm with a capacity of 1 mAh cm. Additionally, Li||LiFePO cells exhibit remarkable cycling stability and rate performance. This work demonstrates the efficacy of the multifunctional interlayer in SEI modulation and dendritic growth inhibition.
锂金属被认为是下一代高能量密度电池阳极的主要候选材料。然而，锂枝晶生长和固体电解质界面（SEI）不稳定等挑战依然存在。传统的通过涂层构建人工界面的方法，由于粘合剂会降低活性，往往会降低有效性。在此，本研究利用纳米纤维状纤维素作为一维模板，构建了一种基于纳米纤维素的柔性超薄（约1μm）、亲锂的SnS纳米纸作为隔膜的中间层。这种创新的中间层具有自支撑性能和机械柔韧性，同时无需使用降低活性的粘合剂。纳米纤维素基底的均匀介孔结构确保了锂离子通量的一致性，增强了电化学稳定性。在此框架内，SnS在锂阳极表面自发形成连续的SEI层，主要由LiS和LiSn组成。该SEI层具有高离子电导率和优异的亲锂性，显著降低了成核过电位，促进了均匀的锂电镀和剥离。因此，配备SnS纳米纸中间层的对称电池表现出卓越的耐久性，在1 mA cm的电流密度和1 mAh cm的容量下可持续运行超过1400小时。此外，Li||LiFePO电池表现出显著的循环稳定性和倍率性能。这项工作证明了多功能中间层在SEI调制和枝晶生长抑制方面的有效性。
