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Preparation and Properties of ZIF-67 Doped Paper-based Separator for Lithium-ion Batteries |
Received:August 24, 2022 |
DOI:10.11980/j.issn.0254-508X.2022.11.011 |
Key Words:paper-based separator sisal fiber ZIF-67 carboxymethylation electrochemical properties |
Fund Project: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)。 |
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Abstract:In the study, cobalt 2-methylimidazole (ZIF-67) was added into sisal pulp followed by filtration and then produced to ZIF-67 doped 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. |
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