石墨烯与导电聚合物PSS∶PEDOT共包覆对LiCoO_2材料高电压电化学性能的影响
Preparation of LiCoO_2 composite coated with graphene and PEDOT∶PSS with enhanced electrochemical properties at high voltage for lithium-ion batteries
查看参考文献33篇
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文摘
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采用易于规模化的湿法包覆工艺成功制备了石墨烯纳米片与聚(3,4-亚乙基二氧噻吩)∶聚(苯乙烯磺酸盐) (PEDOT∶PSS)共包覆的LiCoO_2正极材料(GP-LCO),使用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)及电化学测试方法研究包覆前后材料的晶体结构、微观形貌及电化学性质。结果表明∶均匀分散的石墨烯纳米片(1%,质量分数,下同)与PEDOT∶PSS (2%)在LiCoO_2颗粒表面形成均一的包覆层;电化学测试结果表明,石墨烯纳米片与PEDOT:PSS所形成的复合包覆层不仅提升了材料的电化学反应速率,还改善了电化学反应的可逆性;经过表面包覆的GP-LCO添加2% Super P导电剂所制备的电极,在2.5~4.5 V(vs. Li~+/Li)的电压范围内,0.1 C倍率下首次放电比容量173.9 mAh/g,10 C倍率下仍能表现出118.0 mAh/g的放电容量,循环性能和倍率性能均优于未包覆的LiCoO_2材料(LCO)。 |
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其他语种文摘
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LiCoO_2 coated with graphene and PSS:PEDOT(GP-LCO)is synthesized by a facile and scalable method. The structure and morphology of LiCoO_2(LCO) and GP-LCO have been investigated by X-ray diffraction(XRD) and scanning electron microscopy(SEM). Transmission electron microscopy(TEM)further demonstrate the existence of graphene and PSS:PEDOT. The electrochemical properties of the composites are investigated by cyclic voltammetry and AC impedance measurements, which show that the conductive film of graphene(1%)and PSS:PEDOT(2%)on the surface significantly decreases the charge transfer resistance and improves the cycle stability of LiCoO_2. Galvanostatic charge-discharge test reveals that with only 2% Super P as conductive additive, the GP-LCO delivers a capacity of 173.9 mAh/g at 0.1 C and 118.0 mAh/g at 10 C, which are higher than the pristine LCO in the potential range of 3.0-4.5 V(vs. Li/Li~+). Moreover, it is clearly noticed that the GP-LCO exhibits a capacity retention of 76.6% after 100 cycles at 0.1C, while the LCO only presents a capacity retention of 41.1%. |
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来源
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航空材料学报
,2023,43(4):129-136 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2019.000162
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关键词
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LiCoO_2
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石墨烯
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PSS:PEDOT
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表面包覆
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电化学性能
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地址
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1.
中国航发北京航空材料研究院, 北京, 100095
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北京石墨烯技术研究院有限公司, 北京, 100095
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鲁东大学物理与光电工程学院, 山东, 烟台, 264025
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-5053 |
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学科
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化学工业 |
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文献收藏号
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CSCD:7530398
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