Xin Mingyang, Lian Xin, Gao Xuejie, Xu Pingbo, Li Wenbo, Dong Feilong, Zhang Aotian, Xie Haiming, Liu Yulong
National & Local United Engineering Laboratory for Power Battery, Department of Chemistry, Northeast Normal University, Changchun 130024, China.
Liaoning Key Laboratory of Lignocellulosic Chemistry and Biomaterials, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
J Colloid Interface Sci. 2023 Jan;629(Pt B):980-988. doi: 10.1016/j.jcis.2022.09.127. Epub 2022 Sep 28.
Polyvinylidene difluoride (PVDF) is one of the most attractive electrolyte materials for solid-state batteries due to its high ionic conductivity, however, the battery performance is limited by the high electrolyte-electrode interfacial resistance. Herein, PVDF polymer mixed with ceramic LiLaZrO is coated on cellulose support membrane (PLCSM) through a simple slurry-casting method. The ionic transport of PLCSM is originated from dimethyl formamide (DMF)-Li solvation structure, which plays a critical role in conducting lithium ions. β-PVDF after dehydrofluorination offers a high dielectric constant and enhances the dissociation of lithium salt. As a result, PLCSM with a total thickness of 85 µm presents an oxidation voltage of 4.9 V. Li-Li symmetric cells by employing PLCSM reveal that the critical current density (CCD) is increased to 1 mA cm. A full cell of LiFePO |PLCSM |Li with high mass loading (1.2 mA h cm) shows a first-cycle discharge capacity of 160 mA h g. With LiNiMnCoO as the cathode, the initial discharge capacity is 153 mA h g, and the capacity retention after 80 cycles is 80 %. The sandwiched PLCSM provides an effective strategy to achieve high-performance dendrite-free Li metal batteries.
聚偏氟乙烯（PVDF）因其高离子电导率，是固态电池最具吸引力的电解质材料之一，然而，电池性能受到高电解质-电极界面电阻的限制。在此，通过简单的浆料浇铸法将与陶瓷LiLaZrO混合的PVDF聚合物涂覆在纤维素支撑膜（PLCSM）上。PLCSM的离子传输源自二甲基甲酰胺（DMF）-锂溶剂化结构，其在传导锂离子方面起着关键作用。脱氢氟化后的β-PVDF具有高介电常数并增强了锂盐的离解。结果，总厚度为85 µm的PLCSM呈现出4.9 V的氧化电压。采用PLCSM的锂-锂对称电池表明，临界电流密度（CCD）提高到1 mA cm。高质量负载（1.2 mA h cm）的LiFePO|PLCSM|Li全电池的首次循环放电容量为160 mA h g。以LiNiMnCoO为正极时，初始放电容量为153 mA h g，80次循环后的容量保持率为80%。夹在中间的PLCSM为实现高性能无枝晶锂金属电池提供了一种有效策略。
