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| 木材基凝胶聚合物电解质的制备及其性能研究 |
| Preparation and Properties of Wood-based Gel Polymer Electrolyte |
| 收稿日期：2023-04-13 |
| DOI：10.11980/j.issn.0254-508X.2023.05.011 |
| 关键词: 轻木 凝胶聚合物电解质 锂离子电池 电化学性能 |
| Key Words:balsa wood gel polymer electrolyte lithium-ion battery electrochemical properties |
| 基金项目: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）；广西高等学校千名中青年骨干教师培育计划项目；广西大学科研基金项目（学术骨干项目）（XGZ170232）；广西壮族自治区级大学生创新创业训练项目（202110593256）。 |
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| 摘要:本研究以轻木为原料，经碱处理、漂白、乙酰化、热压和浸渍电解液制备出一种新型木材基凝胶聚合物电解质（GPE）。结果表明，热压改性木片的结晶度为54.7%，机械强度为2.16 MPa，热稳定性高达300 ℃。经电解液润胀后，热压改性木片的孔隙率和吸液率分别为74.6%和719.0%，与热压前性能一致。同时，木材基GPE展现出优异的离子电导率（3.68 mS/cm）和电化学稳定窗口（5.0 V）。组装的Li/GPE/LiFePO4锂离子电池在0.5 C下循环100圈后的容量由150.9 mAh/g仅衰减至146.1 mAh/g。但由于木材基GPE的孔径大，组装的锂离子电池的库伦效率仅为91%。 |
| Abstract:In this study， balsa wood was used to prepare a novel wood-based gel polymer electrolyte （GPE） via alkali treatment， bleaching， acetylation， hot-pressing， and immersion of liquid electrolyte. The results showed that the crystallinity， mechanical strength， and thermal stability of hot-pressed modified wood was 54.7%， 2.16 MPa， and 300 ℃， respectively. After immersion of liquid electrolyte， the porosity and electrolyte uptake of modified wood were 74.6% and 719.0%， respectively， which were consistent with that before hot-pressing. Furthermore， the wood-based GPE exhibited good ionic conductivity （3.68 mS/cm） and wide electrochemical stability window （5.0 V）. The capacity of assembled Li/GPE/LiFePO4 lithium-ion battery decayed from 150.9 mAh/g to 146.1 mAh/g at a rate of 0.5 C after 100 cycles. However， due to the large pore size of the wood-based gel polymer electrolyte， the coulombic efficiency of the assembled lithium-ion battery was only 91%. |
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