储能科学与技术2025，Vol.14Issue(6)：2248-2255,8.DOI:10.19799/j.cnki.2095-4239.2024.1234
低成本干法石墨厚电极的制备与性能研究
Preparation and performance studies of low-cost graphite thick dry electrodes
摘要
Abstract
A graphite dry electrode for lithium-ion batteries was fabricated using a binder fiberization technique.The effects of electrode thickness,polytetrafluoroethylene(PTFE)content,and carbon nanotube(CNT)addition on electrode performance were systematically investigated.Morphological and elemental distribution analyses were conducted using scanning electron microscopy(SEM)and energy-dispersive X-ray spectroscopy(EDS).Mechanical,electrical,and wetting properties were evaluated using a universal testing machine,a four-probe internal resistance meter,and an optical contact angle goniometer,respectively.Electrochemical performance was assessed through charge-discharge testing.The results showed that when the electrode thickness exceeded 300 μm,electrochemical performance deteriorated markedly;therefore,the thickness should be limited to≤300 μm.Based on comprehensive evaluation,including electrochemical behavior,tensile strength,conductivity,and electrolyte wettability,the optimal formulation was identified as graphite∶PTFE∶CNT∶Super P(SP)at a mass ratio of 96∶1∶1∶2.This composition yielded a coulombic efficiency of 91.7%,a reversible capacity exceeding 330 mAh/g,a surface capacity of 11.28 mAh/cm2,a tensile elongation of 9.06%,a resistance of 24.1 Ω,and a contact angle of 65.33°.SEM images confirmed the presence of abundant PTFE fibers on the surface and cross-section of the electrode,forming a branched and hierarchically structured network throughout the electrode matrix.The inclusion of CNTs enhanced both the resilience and conductivity of the electrode sheet,facilitating easier fabrication.To meet the growing demand for high energy density,thick electrode manufacturing has become a critical focus.Unlike conventional wet-coating techniques,dry electrode fabrication eliminates the need for solvents,offering a cost-effective,environmentally friendly,and scalable approach to producing thick electrodes.关键词
锂离子电池/干法电极/PTFE纤维化/石墨/厚电极Key words
lithium-ion batteries/dry electrode/PTFE fiberization/graphite/thick electrode分类
通用工业技术引用本文复制引用
阮晶晶,巫湘坤,李勇慧,赵冲冲,李珅珅,王童飞,梁圣杰,高桂红..低成本干法石墨厚电极的制备与性能研究[J].储能科学与技术,2025,14(6):2248-2255,8.基金项目
河南省科技攻关(242102241044),河南省重点研发计划(221111240100),河南省重点研发专项(241111241500). （242102241044）
