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首页> 外文期刊>Advanced energy materials >Reaching the Energy Density Limit of Layered O3-NaNi_(0.5)Mn_(0.5)O_2 Electrodes via Dual Cu and Ti Substitution
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Reaching the Energy Density Limit of Layered O3-NaNi_(0.5)Mn_(0.5)O_2 Electrodes via Dual Cu and Ti Substitution

机译：通过铜和钛双重取代达到层状O3-NaNi_（0.5）Mn_（0.5）O_2电极的能量密度极限

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摘要

Although being less competitive energy density-wise, Na-ion batteries are serious alternatives to Li-ion ones for applications where cost and sustainability dominate. O3-type sodium layered oxides could partially overcome the energy limitation, but their practical use is plagued by a reaction process that enlists numerous phase changes and volume variations while additionally being moisture sensitive. Here, it is shown that the double substitution of Ti for Mn and Cu for Ni in O3-NaNi0.5-yCuyMn0.5- zTizO2 can alleviate most of these issues. Among this series, electrodes with specific compositions are identified that can reversibly release and uptake approximate to 0.9 sodium per formula unit via a smooth voltage-composition profile enlisting minor lattice volume changes upon cycling as opposed to Delta V/V approximate to 23% in the parent NaNi0.5Mn0.5O2 while showing a greater resistance against moisture. The positive attributes of substitution are rationalized by structure considerations supported by density functional theory (DFT) calculations. Electrodes with sustained capacities of approximate to 180 mAh g(-1) are successfully implemented into 18 650 Na-ion cells having greater performances, energy density-wise (approximate to 250 Wh L-1), than today's Na3V2(PO4)(2)F-3/HC Na-ion technology which excels in rate capabilities. These results constitute a step forward in increasing the practicality of Na-ion technology with additional opportunities for applications in which energy density prevails over rate capability.
机译：尽管在能量密度方面竞争性较弱，但在成本和可持续性占主导地位的应用中，钠离子电池是锂离子电池的替代品。 O3型钠层氧化物可以部分克服能量限制，但是它们的实际使用受到反应过程的困扰，该过程要求许多相变和体积变化，同时还对水分敏感。在此表明，在O3-NaNi0.5-yCuyMn0.5-zTizO2中用Ti替代Mn和Cu替代Ni可以缓解大多数这些问题。在该系列中，鉴定出具有特定组成的电极，该电极可以通过光滑的电压组成曲线可逆地释放和摄取每个配方单元约0.9的钠，从而在循环时获得较小的晶格体积变化，而Delta V / V约为23％。 NaNi0.5Mn0.5O2母体，同时显示出更大的耐湿性。取代的积极属性通过密度泛函理论（DFT）计算所支持的结构考虑因素得以合理化。可以将持续容量约为180 mAh g（-1）的电极成功应用于18650个Na离子电池中，该电池具有比当今的Na3V2（PO4）（2）更高的能量密度（约250 Wh L-1）性能。 F-3 / HC Na-ion技术，具有出色的定速能力。这些结果构成了在提高Na离子技术实用性方面迈出的一步，并为能量密度超过速率能力的应用提供了更多机会。

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  • 来源
    《Advanced energy materials》 |2019年第36期|1901785.1-1901785.11|共11页
  • 作者

    Wang Qing; Mariyappan Sathiya; Vergnet Jean; Abakumov Artem M.; Rousse Gwenaelle; Rabuel Francois; Chakir Mohamed; Tarascon Jean-Marie;

  • 作者单位

    Coll France Chim Solide Energie UMR8260 F-75231 Paris 05 France|Sorbonne Univ 4 Pl Jussieu F-75005 Paris France|Renault Technoctr 1 Ave Golf F-78288 Guyancourt France;

    Coll France Chim Solide Energie UMR8260 F-75231 Paris 05 France|FR CNRS 3459 RS2E F-80039 Amiens France;

    Coll France Chim Solide Energie UMR8260 F-75231 Paris 05 France|Sorbonne Univ 4 Pl Jussieu F-75005 Paris France|FR CNRS 3459 RS2E F-80039 Amiens France;

    Skolkovo Inst Sci & Technol Ctr Energy Sci & Technol Nobel Str 3 Moscow 143026 Russia;

    Sorbonne Univ 4 Pl Jussieu F-75005 Paris France;

    FR CNRS 3459 RS2E F-80039 Amiens France|Univ Picardie Jules Verne UMR 7314 Lab React & Chim Solides F-80039 Amiens 1 France;

    Renault Technoctr 1 Ave Golf F-78288 Guyancourt France;

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  • 正文语种 eng
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  • 关键词

    18 650 prototype cells; air stability; high energy; O3-type layered oxides; sodium-ion batteries;

    机译：18650个原型单元;空气稳定性高能量;O3型层状氧化物;钠离子电池;

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