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首页> 外文期刊>RSC Advances >Role of Al-doping with different sites upon the structure and electrochemical performance of spherical LiNi0.5Mn1.5O4 cathode materials for lithium-ion batteries
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Role of Al-doping with different sites upon the structure and electrochemical performance of spherical LiNi0.5Mn1.5O4 cathode materials for lithium-ion batteries

机译：不同部位对不同部位的角色在锂离子电池的球形LiNi0.5mN1.5O4阴极材料的结构和电化学性能下

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摘要

Al-doped spinel LiNi0.5Mn1.5O4 materials with different sites and contents were synthesized by rapid precipitation combined with hydrothermal treatment and calcination. The roles of Al on structural stability and electrochemical performance were studied by utilizing a series of techniques. XRD patterns indicated lower ion diffusion and no impure phased in doped samples. FT-IR and CV results reveal that Al-doped materials possess a Fd3m space group with increased disorder and increasing amounts of Mn3+. SEM and TEM equipped with EDS were used to characterize the regular morphology accompanied by a complete crystal structure and homogeneous distribution of elements. The Al content at the Ni, Mn, and Ni/Mn sites was optimized to be 5%, 3% and 5% (in total), respectively. The cycling stability was considerably enhanced at an ambient temperature (25 degrees C) and high temperature (55 degrees C). A typical Al dual-doped sample at Ni/Mn sites with 5% content delivered a reversible capacity of 113.5 mA h g(-1) after 200 cycles at 0.5C. The discharge capacity at 5, 10 and 20C was 127.3, 125.5 and 123.1 mA h g(-1), respectively. The discharge capacity remained at 126 mA h g(-1) after 50 cycles (55 degrees C, 0.5C). Subsequent EIS and analytical results of the cycled electrode showed improved structural stability with a lower resistance, stable cathode/electrolyte interface, and reduced dissolution of Mn. These data further demonstrated the feasibility and reliability of preparing high-performance spinel LiNi0.5Mn1.5O4 cathode materials by doping with a suitable amount of Al.
机译：通过快速降水合并水热处理和煅烧，合成具有不同部位和内容物的型尖晶石LINI0.5MN1.5O4材料。通过利用一系列技术研究了Al对结构稳定性和电化学性能的作用。 XRD图案表示较低的离子扩散，并且在掺杂样品中不相平衡。 FT-IR和CV结果表明，Al掺杂物质具有增强的疾病和增加的MN3 +的FD3M空间组。配备EDS的SEM和TEM用于表征常规形态，伴随着完整的晶体结构和元素的均匀分布。 Ni，Mn和Ni / Mn位点的Al含量分别优化为5％，3％和5％（总共）。在环境温度（25℃）和高温（55℃）下，循环稳定性显着增强。在0.5℃下的200次循环后，Ni / Mn位点的典型Al双掺杂样品在Ni / Mn位点，其具有5％含量的可逆容量为113.5 mA H（-1）。分别为5,10和20℃的放电容量分别为127.3,125.5和123.1mA H（-1）。 50个循环后的放电容量保持在126 mA H（-1）（55摄氏度，0.5℃）。循环电极的随后的EIS和分析结果显示出具有较低电阻，稳定的阴极/电解质界面和降低Mn的溶解的改善的结构稳定性。这些数据进一步证明了通过用合适量的Al掺杂制备高性能尖晶石LiNi0.5Mn1.5O4阴极材料的可行性和可靠性。

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  • 来源
    《RSC Advances》 |2019年第22期|共11页
  • 作者

    Chen Anyong; Kong Linglong; Shu Yang; Yan Wenchao; Wu Wei; Xu Yongji; Gao Hongtao; Jin Yongcheng;

  • 作者单位

    Qingdao Univ Sci &

    Technol Coll Chem &

    Mol Engn State Key Lab Base Ecochem Engn Qingdao 266042 Shandong Peoples R China;

    Univ Chinese Acad Sci Ctr Mat Sci &

    Optoelect Engn Beijing 100049 Peoples R China;

    Chinese Acad Sci Qingdao Inst Bioenergy &

    Bioproc Technol Qingdao 266101 Shandong Peoples R China;

    Univ Chinese Acad Sci Ctr Mat Sci &

    Optoelect Engn Beijing 100049 Peoples R China;

    Univ Chinese Acad Sci Ctr Mat Sci &

    Optoelect Engn Beijing 100049 Peoples R China;

    Qingdao Univ Sci &

    Technol Coll Chem &

    Mol Engn State Key Lab Base Ecochem Engn Qingdao 266042 Shandong Peoples R China;

    Qingdao Univ Sci &

    Technol Coll Chem &

    Mol Engn State Key Lab Base Ecochem Engn Qingdao 266042 Shandong Peoples R China;

    Univ Chinese Acad Sci Ctr Mat Sci &

    Optoelect Engn Beijing 100049 Peoples R China;

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