Heewon Jin, Chelwoo Kim, Sei-Min Park, Jung-Chul An, Inchan Yang, Dalsu Choi
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However, despite the high crystallinity, both CPE and WPE derived carbon contained significant number of fine particles and exhibited a broad particle size distribution. When used as an anode for LIBs, fine particles led to unwanted side reactions, resulting in an initial coulombic efficiency (ICE) of around 85%, which is lower than the ICE value of 92.5% observed in CAM. To tackle the low ICE problem, recarbonization after coal tar (CT) coating was adopted as a mean to induce secondary particle formation. After CT coating, the average particle size increased, and the size distribution became narrower. Although CT coating reduced the crystallinity slightly, the overall level remained comparable to that of CAM. 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引用次数: 0
摘要
聚乙烯(PE)是最广泛使用的塑料之一,大量的PE废物要么被掩埋,要么被焚烧,导致环境问题。重要的研究工作集中在将废弃PE转化为碳材料,特别是锂离子电池(lib)的碳阳极。然而,与石墨基商业阳极材料(CAM)相比,大多数先前开发的聚乙烯基碳阳极表现不佳。本研究以商用高密度聚乙烯(CPE)和废旧高密度聚乙烯(WPE)为原料制备了锂离子电池负极材料。通过热氧化稳定和高温石墨化,CPE和WPE都成功转化为与CAM相当的高结晶碳材料。然而,尽管CPE和WPE衍生碳的结晶度很高,但它们都含有大量的细颗粒,并表现出广泛的粒度分布。当用作锂离子电池的阳极时,细颗粒会导致不必要的副反应,导致初始库仑效率(ICE)约为85%,低于CAM中观察到的92.5%的ICE值。为了解决低ICE问题,采用煤焦油(CT)涂层后的再碳化作为诱导二次颗粒形成的手段。CT包覆后,平均粒径增大,粒径分布变窄。CT涂层虽然使结晶度略有降低,但总体水平与CAM相当。结果,ct包覆的石墨化CPE (GCPE@10CT)和ct包覆的石墨化WPE (GWPE@10CT)表现出堪比CAM作为锂离子电池阳极的性能,ICE超过93%,容量约为349 mAh g−1。
Coal tar-coated artificial graphite anode derived from polyethylene for lithium-ion batteries
Polyethylene (PE) is one of the most widely used plastics, and vast amounts of waste PE are either buried or incinerated, leading to environmental concerns. Significant research efforts have focused on converting waste PE into carbon materials, particularly as carbon anodes for lithium-ion batteries (LIBs). However, most previously developed PE-based carbon anodes have underperformed compared to graphite-based commercial anode materials (CAM). In this study, LIB anode materials were prepared based on both commercial high-density polyethylene (CPE) and waste high-density polyethylene (WPE). Through thermal oxidative stabilization and high-temperature graphitization, both CPE and WPE were successfully transformed into highly crystalline carbon materials comparable to CAM. However, despite the high crystallinity, both CPE and WPE derived carbon contained significant number of fine particles and exhibited a broad particle size distribution. When used as an anode for LIBs, fine particles led to unwanted side reactions, resulting in an initial coulombic efficiency (ICE) of around 85%, which is lower than the ICE value of 92.5% observed in CAM. To tackle the low ICE problem, recarbonization after coal tar (CT) coating was adopted as a mean to induce secondary particle formation. After CT coating, the average particle size increased, and the size distribution became narrower. Although CT coating reduced the crystallinity slightly, the overall level remained comparable to that of CAM. As a result, the CT-coated graphitized CPE (GCPE@10CT) and CT-coated graphitized WPE (GWPE@10CT) exhibited performance comparable to CAM as LIB anodes, achieving an ICE of over 93% and a capacity of approximately 349 mAh g−1.
期刊介绍:
Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.