常压连续等离子体制备长效亲水锂离子电池隔膜  

Preparation of long-term hydrophilic separator for lithium-ion battery by continuous atmospheric pressure plasma

作　　者：李妍 王超梁[1,2,3] 覃思成 周贵树 张菁[1,2,3] LI Yan;WANG Chaoliang;QIN Sicheng;ZHOU Guishu;ZHANG Jing(College of Science,Donghua University,Shanghai 201620,China;Member of Magnetic Confinement Fusion Research Center,Ministry of Education,Donghua University,Shanghai 201620,China;Textile Key Laboratory for Advanced Plasma Technology and Application,Donghua University,Shanghai 201620,China;Fudi Battery Shanghai Development Center,Shanghai 201611,China)

机构地区：[1]东华大学理学院,上海201620 [2]东华大学磁约束核聚变教育部研究中心,上海201620 [3]东华大学纺织行业先进等离子体技术与应用重点实验室,上海201620 [4]弗迪电池上海开发中心,上海201611

出　　处：《东华大学学报（自然科学版）》2022年第6期29-35,共7页Journal of Donghua University(Natural Science)

基　　金：国家自然科学基金面上项目(12075054);中央高校基本科研资金项目(2232019A3-12)。

摘　　要：基于常压连续等离子体增强化学气相沉积法,在聚乙烯隔膜上沉积含Si杂化纳米颗粒膜。采用扫描电子显微镜、红外光谱仪、X射线光电子能谱仪和光学接触角测量仪等仪器对隔膜的表面形貌、化学结构和亲水性等性能进行表征;使用电化学工作站对组装电池进行阻抗测试。结果表明:隔膜表面有杂化纳米颗粒紧密黏附,其成分为SiO_(3.5)C_(1.1)H_(x);涂层样的水接触角从121°降至22°左右,该接触角保持30 d无明显变化;经120℃热处理1 h后,透气性基本保持不变,符合锂离子电池组装过程对隔膜的要求;原样组装电池的电荷转移阻抗值为81.69Ω,而涂层样组装电池的阻抗为64.51Ω,说明电荷的传导性能得到提高。常压连续等离子体增强化学气相沉积方法可有效应用于长效亲水聚乙烯电池隔膜制备,在高性能锂离子电池方面拥有巨大的应用前景。Si-containing hybrid nanoparticle films were deposited on polyethylene membranes based on atmospheric pressure continuous plasma-enhanced chemical vapor deposition.The surface morphology,chemical structure and hydrophilic etc.,properties of the separator were characterized by scanning electron microscope,infrared spectrometer,X-ray photoelectron spectrometer and optical contact angle measuring instrument etc.Electrochemical impedance tests were performed on the assembled battery using an electrochemical workstation.The results show that the surface of the separator is tightly adhered with hybrid nanoparticles,whose composition is SiO_(3.5)C_(1.1)H_(x).The water contact angle of the coated separator decreases from 121°to about 22°,and the water contact angle remains unchanged for 30 days.After heat treatment at 120℃for 1 h,the air permeability remains basically unchanged,which meets the assembly process requirements for lithium-ion battery separator.The charge transfer impedance value of the original separator-assembled battery is 81.69Ω,while the impedance value of the coated separator-assembled battery is reduced to 64.51Ω.This means that the charge conductivity of the coated separator-assembled battery is improved.The atmospheric pressure continuous plasma-enhanced chemical vapor deposition is an efficient method for preparing long term hydrophilic polymer separator,which has great application prospects for high-performance lithium-ion batteries.

关 键 词：锂离子电池隔膜 等离子体增强化学气相沉积 SiO_(3.5)C_(1.1)H_(x)纳米颗粒 亲水性 时效性 电化学阻抗 

分 类 号：O539[理学—等离子体物理]