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Storage performance of Mg(2+)substituted NaMnPO(4)with an olivine structure

机译：Mg（2+）替代Namnpo（4）的储存性能具有橄榄石结构

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摘要

Sodium manganese phospho-olivine, NaMnPO4, is considered to be a higher-voltage alternative to the presently used iron-based electrode material, NaFePO4, for sodium ion batteries. Irrespective of this advantage, the electrochemical performance of NaMnPO(4)is still far from what is desired. Herein we provide the first report on the storage performance of NaMnPO(4)having a structure modified by Mg(2+)substitution. The Mg-substituted phospho-olivines are prepared on the basis of ionic exchange reactions involving the participation of Mg-substituted KMnPO4 center dot H2O dittmarites as structural template. Furthermore, the phosphate particles were covered with a thin layer (up to 5 nm) of activated carbon through ball-milling. The storage performance of phospho-olivines is analyzed in sodium and lithium half-ion cells, as well as in full-ion cellsversusbio-mass derived activated carbon and spinel Li(4)Ti(5)O(12)as anodes. The compatibility of phospho-olivines with electrolytes is assessed by utilization of several types of lithium and sodium carbonate-based solutions. In sodium half-cell, the Mg-substituted phosphate displays a multi-phase mechanism of Na(+)intercalation in case when NaTFSI-based electrolyte is used. In lithium half-cell, the high specific capacity and rate capability is achieved for phospho-olivine cycled in LiPF6-based electrolyte. This is a consequence of the occurrence of dual Li+,Na(+)intercalation, which encompass nano-sized domains. The utilization of the Mg-substituted phospho-olivine in the full ion cell is demonstrated.
机译：锰磷酸钠NamnPO4被认为是目前使用的铁基电极材料Nafepo4的高压替代物，用于钠离子电池。无论这种优点如何，Namnpo（4）的电化学性能仍然远离所需的东西。在此，我们提供了关于NamNPO（4）的储存性能的第一份报告，其具有由Mg（2+）替换改性的结构。基于涉及Mg-替代的kmnpo4中心点H2O dittmarites作为结构模板的离子交换反应，基于离子交换反应制备Mg取代的磷酸橄榄石。此外，通过球磨用薄层（高达5nm）的活性炭覆盖磷酸盐颗粒。磷酸橄榄石的储存性能在钠和锂半离子细胞中分析，以及全离子细胞β-质量衍生的活性炭和尖晶石Li（4）Ti（5）O（12）作为阳极。通过利用若干类型的锂和碳酸钠基溶液来评估磷酸橄榄石与电解质的相容性。在半电池钠中，Mg-取代的磷酸盐在使用基于NATFSI的电解质时显示出多相机制的NA（+）插层。在锂半电池中，对LiPF6电解质中循环的磷酸橄榄胺实现了高比容量和速率能力。这是双Li +，Na（+）插层的发生的结果，其包括纳米大小的结构域。证明了在全离子电池中使用Mg取代的磷酸橄榄醛。

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  • 来源
    《RSC Advances》 |2020年第49期|共10页
  • 作者

    Boyadzhieva Tanya; Koleva Violeta; Kukeva Rosica; Nihtianova Diana; Harizanova Sonya; Stoyanova Radostina;

  • 作者单位

    Bulgarian Acad Sci Inst Gen &

    Inorgan Chem Acad G Bonchev Str Bldg 11 Sofia 1113 Bulgaria;

    Bulgarian Acad Sci Inst Gen &

    Inorgan Chem Acad G Bonchev Str Bldg 11 Sofia 1113 Bulgaria;

    Bulgarian Acad Sci Inst Gen &

    Inorgan Chem Acad G Bonchev Str Bldg 11 Sofia 1113 Bulgaria;

    Bulgarian Acad Sci Inst Gen &

    Inorgan Chem Acad G Bonchev Str Bldg 11 Sofia 1113 Bulgaria;

    Bulgarian Acad Sci Inst Gen &

    Inorgan Chem Acad G Bonchev Str Bldg 11 Sofia 1113 Bulgaria;

    Bulgarian Acad Sci Inst Gen &

    Inorgan Chem Acad G Bonchev Str Bldg 11 Sofia 1113 Bulgaria;

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  • 正文语种 eng
  • 中图分类 化学;
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