纤维素纳米纤丝增强聚环氧乙烷基固态电解质的制备及性能研究OA
Study on Preparation and Properties of Polyethylene Oxide-based Solid Electrolytes Reinforced with Cellulose Nanofibrils
本研究采用溶液浇铸法成功制备了以纤维素纳米纤丝(CNF)作为绿色增强填料的聚环氧乙烷(PEO)/LiTFSI/CNF固态电解质,并系统考察了CNF含量对其结构与性能的影响.结果表明,CNF通过物理交联在PEO基体中构建了三维网络骨架,显著增强了电解质的力学性能与高温尺寸稳定性,进而有效提升了其抑制锂枝晶的能力与电池安全边界.同时,适量的CNF可抑制PEO结晶,促进无定形区的形成,为锂离子传输提供更多的连续通道.当CNF含量为3%(以PEO质量计)时,该电解质表现出最优的综合性能,在60℃下离子电导率达5.95×10⁻⁴ S/cm,锂离子迁移数提升至0.539,电化学稳定窗口拓宽至4.98 V.基于该电解质组装的固态锂离子电池表现出优异的电化学循环稳定性与实际应用潜力.
This study fabricated solid electrolytes polyethylene oxide(PEO)/LiTFSI/CNF using cellulose nanofibril(CNF)as a green reinforc-ing filler via solution casting,and systematically investigated the effects of CNF content on the structure and properties of the electrolytes.The results demonstrated that CNF formed a three-dimensional network framework within the PEO matrix through physical crosslinking,sig-nificantly enhancing the mechanical strength and high-temperature dimensional stability of the electrolyte.This reinforcement effectively im-proved lithium dendrite suppression and extended the safety margin of the battery.Moreover,an appropriate amount of CNF suppressed PEO crystallization and promoted the formation of amorphous regions,providing more continuous pathways for lithium-ion transport.The electro-lyte with 3%CNF exhibited optimal overall performance:an ionic conductivity of 5.95×10⁻⁴ S/cm at 60℃,a lithium-ion transference number of 0.539,and an electrochemical stability window of 4.98 V.The solid-state lithium-ion battery assembled with this electrolyte demonstrating excellent electrochemical stability and promising practical potential.
董昕宇;杨仁党;胡敏;蓝敬;王阳
华南理工大学先进造纸与纸基材料全国重点实验室,广东 广州,510640华南理工大学先进造纸与纸基材料全国重点实验室,广东 广州,510640华南理工大学先进造纸与纸基材料全国重点实验室,广东 广州,510640华南理工大学先进造纸与纸基材料全国重点实验室,广东 广州,510640五邑大学纺织科学与工程学院,广东 江门,529020
轻工纺织
纤维素纳米纤丝聚环氧乙烷固态电解质锂离子电池
cellulose nanofibrilspolyethylene oxidesolid electrolytelithium-ion batteries
《中国造纸》 2026 (5)
12-21,10
广东省基础与应用基础研究基金(2024A1515011654,2023A1515110431).
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