A NASICON‐Type Positive Electrode for Na Batteries with High Energy Density: Na4MnV(PO4)3,Small Methods

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A NASICON‐Type Positive Electrode for Na Batteries with High Energy Density: Na4MnV(PO4)3
Small Methods ( IF 10.7 ) Pub Date : 2018-08-27 , DOI: 10.1002/smtd.201800218
Fan Chen _{1,

2} , Vadim M. Kovrugin _{1,

2} , Rénald David _{1,

2} , Olivier Mentré ₃ , François Fauth ₄ , Jean‐Noël Chotard _{1,

2} , Christian Masquelier _{1,

2}

Affiliation

The mixed Mn²⁺/V³⁺ Na‐super‐ionic‐conductor (NASICON) cathode material Na₄MnV(PO₄)₃ is prepared by solid‐state reaction at 800 °C under argon. When used as a positive electrode in Na batteries, this material can exchange three electrons for two transition metals, that is, yielding a high gravimetric capacity of 156 mAh g⁻¹ on charge when the upper cutoff voltage is set to 4.3 V versus Na⁺/Na. Operando X‐ray diffraction during battery operation is performed and it is shown that the mechanisms of Na⁺ insertion/extraction are single or biphasic depending on the electrochemical cycling conditions.

中文翻译：

用于高能量密度Na电池的NASICON型正电极：Na4MnV（PO4）3

混合的Mn ²⁺ / V ³⁺ Na超离子导体（NASICON）正极材料Na ₄ MnV（PO ₄）₃是在氩气下于800°C固相反应制备的。当在Na电池中用作正极时，该材料可以将三种电子交换为两种过渡金属，也就是说，当上截止电压设为相对于Na ^+的4.3 V时，充电时可产生156 mAh g ^-1的高重量容量。/不。在电池运行期间进行了Operando X射线衍射，结果表明，Na ⁺插入/萃取的机理是单相或双相的，具体取决于电化学循环条件。

更新日期：2018-08-27

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