ZIF-67掺杂纸基锂离子电池隔膜的制备及其性能研究  

Preparation and Properties of ZIF-67 Doped Paper-based Separator for Lithium-ion Batteries

作　　者：伍锦群 李政蒿 李薇 WU Jinqun;LI Zhenghao;LI Wei(College of Light Industry and Food Engineering,Guangxi University,Nanning,Guangxi Zhuang Autonomous Region,530004;Guangxi Key Lab of Clean Pulp&Papermaking and Pollution Control,Nanning,Guangxi Zhuang Autonomous Region,530004)

机构地区：[1]广西大学轻工与食品工程学院,广西南宁530004 [2]广西清洁化制浆造纸与污染控制重点实验室,广西南宁530004

出　　处：《中国造纸》2022年第11期102-112,共11页China Pulp & Paper

基　　金：广西青年科学基金项目(2018GXNSFBA138027);广西高校中青年教师基础能力提升项目(2018KY0023);广西大学科研基金项目(学术骨干项目)(XGZ170232)。

摘　　要：本研究将二甲基咪唑钴(ZIF-67)添加到剑麻浆料中,抽滤后制备ZIF-67掺杂纸基锂离子电池隔膜。结果表明,随着ZIF-67掺杂量由0增加至30%,纸基锂离子电池隔膜的孔隙率由74.5%降至45.5%,亲液性增加,离子电导率由0.29 mS/cm提高至2.58 mS/cm,界面电阻由467Ω减小至210Ω,电化学稳定窗口由4.6 V增加至5.2 V。当ZIF-67掺杂量为30%时,组装的锂离子电池在循环50次后容量保持率高达90%。剑麻纤维经羧甲基化改性后,纸基锂离子电池隔膜的孔隙率增加,各项电化学性能也有所提高,但由于其机械强度较差,导致其电池容量快速衰减。In the study,cobalt 2-methylimidazole(ZIF-67)was added into sisal pulp followed by filtration and then produced to ZIF-67doped paper-based separator for lithium-ion batteries(LIBs). The results showed that the porosity of paper-based separators for LIBs decreased from 74. 5% to 45. 5% with the increase of the ZIF-67 dosage from 0 to 30%,and the affinity of separators to liquid electrolyte enhanced,ionic conductivity increased from 0. 29 mS/cm to 2. 58 mS/cm,interfacial resistance decreased from 467 Ω to 210 Ω,and electrochemical stability window increased from 4. 6 V to 5. 2 V. When the doping content of ZIF-67 was 30%,the capacity retention rate of assembled LIBs was up to 90% after 50 cycles. When the sisal fibers were modified by carboxymethylation,the porosity of the paper-based separators for LIBs increased,and the electrochemical properties were also improved. However,the capacity of the separators rapidly decreased due to its poor mechanical strength.

关 键 词：纸基电池隔膜 剑麻纤维 ZIF-67 羧甲基化 电化学性能 

分 类 号：TS761.2[轻工技术与工程—制浆造纸工程]