Multiscalar Investigation of FeVO4 Conversion Cathode for a Low Concentration Zn(CF3SO3)2 Rechargeable Zn‐Ion Aqueous Battery,Batteries & Supercaps

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Multiscalar Investigation of FeVO4 Conversion Cathode for a Low Concentration Zn(CF3SO3)2 Rechargeable Zn‐Ion Aqueous Battery
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-03-06 , DOI: 10.1002/batt.202000018
Sonal Kumar ₁ , Vivek Verma ₁ , Rodney Chua ₁ , Hao Ren ₁ , Pinit Kidkhunthod ₂ , Catleya Rojviriya ₂ , Suchinda Sattayaporn ₂ , Frank M. F. Groot ₃ , William Manalastas ₁ , Madhavi Srinivasan _{1,

4}

Affiliation

Battery cathode materials operating on multivalent‐ion intercalation are prone to short operational lifetimes, traditionally explained to be due to poor solid‐state diffusion. Here, we overcome this problem by using a conversion‐type cathode material and demonstrate the benefits in a FeVO₄ host structure. The rechargeable Zn‐ion battery exhibits stability for an unprecedented operational lifetime of 57 days with a high capacity of 272 mAh g⁻¹ (60 mA g⁻¹) over 140 cycles. We use a combination of synchrotron‐based XAS, SRXTM, Raman, XRD and HRTEM techniques to elucidate the cathode material evolution at multilength‐scale for understanding the Zn‐ion storage mechanism. We further highlight the benefits of using a low‐salt concentration electrolyte and pH‐consideration analysis in aqueous battery development, the optimization of which leads to a 4‐fold increase in battery performance as compared to conventional high‐salt concentration electrolyte formulations.

中文翻译：

低浓度Zn（CF3SO3）2可充电锌离子水电池FeVO4转换阴极的多尺度研究

传统上认为，采用多价离子插层的电池正极材料的使用寿命很短，这是由于固态扩散不良所致。在这里，我们通过使用转换型阴极材料克服了这个问题，并展示了FeVO ₄主体结构的优势。Zn-离子可充电电池具有57天空前的使用寿命，具有272 mAh g ^-1（60 mA g ^-1）的高容量，具有出色的稳定性）超过140个周期。我们结合使用基于同步加速器的XAS，SRXTM，拉曼，XRD和HRTEM技术，以了解多长度尺度上阴极材料的演化，从而了解Zn离子的存储机理。我们进一步强调了在含水电池开发中使用低盐浓度电解质和pH值考虑分析的好处，与常规的高盐浓度电解质配方相比，其优化导致电池性能提高了4倍。

更新日期：2020-03-06

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