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An In Situ Interface Reinforcement Strategy Achieving Long Cycle Performance of Dual-Ion Batteries

机译：实现双离子电池长循环性能的原位界面增强策略

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摘要

Dual-ion batteries (DIBs) with high operation voltage offer promising candidates for low-cost clean energy chemistries. However, there still exist tough issues, including structural collapse of the graphite cathode due to solvent co-intercalation and electrolyte decomposition on the electrode/electrolyte interface, which results in unsatisfactory cyclability and fast battery failure. Herein, Li4Ti5O12 (LTO) modified mesocarbon microbeads (MCMBs) are proposed as a cathode material. The LTO layer functions as a skeleton and offers electrocatalytic active sites for in situ generation of a favorable and compatible cathode electrolyte interface (CEI) layer. The synergetic LTO-CEI network can change the thermodynamic behavior of the PF6-intercalation process and maintain the structural integrity of the graphite cathode, as a "Great Wall" to protect the cathode from structural collapse and electrolyte decomposition. Such LTO-CEI reinforced cathode exhibits a prolonged cyclability with 85.1% capacity retention after 2000 cycles even at cut-off potential of 5.4 V versus Li+/Li. Moreover, the LTO-modified MCMB (+)//prelithiated MCMB (-) full cell exhibits a high energy density of similar to 200 Wh kg(-1), remarkably enhanced cyclability with 93.5% capacity retention after 1000 cycles. Undoubtedly, this work offers in-depth insight into interface chemistry, which can arouse new originality to boost the development of DIBs.
机译：具有高工作电压的双离子电池（DIB）为低成本清洁能源化学提供了有希望的候选者。然而，仍然存在棘手的问题，包括由于溶剂共嵌入而导致的石墨阴极的结构塌陷以及在电极/电解质界面上的电解质分解，这导致不令人满意的循环性和快速的电池故障。在此，提出了Li 4 Ti 5 O 12（LTO）改性的中间碳微珠（MCMB）作为正极材料。 LTO层起骨架的作用，并提供电催化活性位，用于原位生成有利且相容的阴极电解质界面（CEI）层。协同作用的LTO-CEI网络可以改变PF6-嵌入过程的热力学行为，并保持石墨阴极的结构完整性，作为“长城”来保护阴极免受结构崩溃和电解质分解的影响。这样的LTO-CEI增强阴极即使在Li + / Li的截止电位为5.4 V的情况下，在2000次循环后仍显示出延长的循环能力和85.1％的容量保持率。此外，LTO修饰的MCMB（+）//预锂化的MCMB（-）全电池表现出类似于200 Wh kg（-1）的高能量密度，在1000次循环后具有93.5％的容量保持率，循环能力显着增强。无疑，这项工作提供了对界面化学的深入了解，可以激发新的创意来促进DIB的发展。

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  • 来源
    《Advanced energy materials》 |2019年第16期|1804022.1-1804022.10|共10页
  • 作者

    Han Xiaoqi; Xu Gaojie; Zhang Zhonghua; Du Xiaofan; Han Pengxian; Zhou Xinhong; Cui Guanglei; Chen Liquan;

  • 作者单位

    Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao Ind Energy Storage Res Inst, Qingdao 266101, Shandong, Peoples R China|Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100190, Peoples R China;

    Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao Ind Energy Storage Res Inst, Qingdao 266101, Shandong, Peoples R China;

    Qingdao Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266042, Shandong, Peoples R China;

    Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao Ind Energy Storage Res Inst, Qingdao 266101, Shandong, Peoples R China;

    Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao Ind Energy Storage Res Inst, Qingdao 266101, Shandong, Peoples R China;

    Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Shandong, Peoples R China;

    Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao Ind Energy Storage Res Inst, Qingdao 266101, Shandong, Peoples R China;

    Chinese Acad Sci, Inst Phys, Key Lab Renewable Energy, Beijing 100190, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    cathode electrolyte interface; dual-ion batteries; energy storage; graphite cathodes; Li4Ti5O12;

    机译：阴极电解液界面;双离子电池;储能;石墨阴极;Li4Ti5O12;

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