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Low-Overpotential LiF Splitting in Lithiated Fluoride Conversion Cathode Catalyzed by Spinel Oxide

机译：在尖晶石氧化物催化的锂化氟化物转化阴极中的低通态Liv

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摘要

Conversion chemistry involving LiF splitting is an appealing route toward high capacity cathodes for Li-ion batteries. In general, cathodes based on LiF splitting need a redox host to provide the driving force for LiF decomposition from the surface. However, most of the systems are still far from practical owing to their limitations, especially the high charge voltage (4.5-5.0 V) needed to fully utilize the capacity and the subsequent low energy efficiency (80%). The redox host is apparently the key to further reduce the required charge voltage and improve the energy efficiency. Here, a new LiF-NiFe2O4 conversion cathode chemistry is designed and demonstrated with a crystalline spinel oxide redox host. It is demonstrated that the new host effectively improves the surface redox and LiF splitting kinetics, which enable the new cathode to work at much lower charge cutoffvoltage (4.2 V) without compromising the delivered capacity and voltage. The LiF-NiFe2O4 composite thin film is able to be discharged with large capacity of 237 mA h g(-1) with high energy efficiency (88%), substantial pseudocapacitance contribution (90%), and satisfactory capacity retention. This result indicates LiF splitting chemistry can become practical by carefully tailoring the redox host chemistry and optimizing the composition.
机译：涉及LiF分裂的转换化学是对锂离子电池的高容量阴极的吸引力。通常，基于LiF分裂的阴极需要氧化还原宿主来为来自表面的生裂分解提供驱动力。然而，由于它们的局限性，大多数系统仍然远离实际，特别是高电荷电压（4.5-5.0V）需要充分利用容量和随后的低能量效率（<80％）。氧化还原主机显然是进一步降低所需电荷电压的关键，提高能量效率。这里，使用晶尖氧化物氧化还原宿主设计和说明新的LIF-NiFe2O4转化阴极化学。结果表明，新宿主有效地改善了表面氧化还原和LiF分裂动力学，使新阴极能够在低温下工作（4.2V），而不会损害输送的容量和电压。 LiF-NiFe2O4复合薄膜能够以大容量为237 mA H（-1），具有高能量效率（88％），实质性伪震动贡献（> 90％），令人满意的容量保留。该结果表明，通过仔细定制氧化还原宿主化学并优化组合物，LiF分裂化学可以实现实用。

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  • 来源
    《Advanced Functional Materials》 |2021年第18期|2009133.1-2009133.12|共12页
  • 作者

    Wei Kaiyuan; Zhao Yu; Chen Keyi; Sun Ke; Wu Tao; Dong Zhaohui; Cui Yanhua; Zeng Chao; Li Chilin;

  • 作者单位

    China Acad Engn Phys Inst Elect Engn Mianyang 621000 Sichuan Peoples R China;

    China Acad Engn Phys Inst Elect Engn Mianyang 621000 Sichuan Peoples R China;

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram & Superfine 585 He Shuo Rd Shanghai 201899 Peoples R China|Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China;

    Brookhaven Natl Lab Upton NY 11973 USA;

    China Acad Engn Phys Inst Elect Engn Mianyang 621000 Sichuan Peoples R China;

    Chinese Acad Sci Shanghai Adv Res Inst Shanghai Synchrotron Radiat Facil Shanghai 201204 Peoples R China;

    China Acad Engn Phys Inst Elect Engn Mianyang 621000 Sichuan Peoples R China;

    China Acad Engn Phys Inst Elect Engn Mianyang 621000 Sichuan Peoples R China;

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram & Superfine 585 He Shuo Rd Shanghai 201899 Peoples R China|Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    lithiated conversion cathode; lithium fluoride; PLD; spinel oxide; thin film;

    机译：锂化的转化阴极;氟化锂;PLD;尖晶石;薄膜;

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