Microwave-Assisted Synthesis of NaCoPO4 Red-Phase and Initial Characterization as High Voltage Cathode for Sodium-Ion Batteries,ACS Applied Materials & Interfaces

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Microwave-Assisted Synthesis of NaCoPO4 Red-Phase and Initial Characterization as High Voltage Cathode for Sodium-Ion Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-01-20 00:00:00 , DOI: 10.1021/acsami.6b14341
Arturo Gutierrez ₁ , Soojeong Kim ₁ , Timothy T. Fister ₁ , Christopher S. Johnson ₁

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Transition metal-containing polyanion compounds are attractive for use as cathode materials in sodium-ion batteries (SIB) because they possess elevated higher intrinsic electrochemical potentials versus oxide analogs given the same M^n+/(n+1)+ redox couple, which leads to higher energy densities. NaMPO₄ (M = transition metal) compounds have a driving force to form into the electrochemically inactive maricite phase when using conventional methods. Herein we report on the synthesis of a NaCoPO₄ (NCP) polymorph (“Red”-phase) by a microwave-assisted solvothermal process at 200 °C using tetraethylene glycol as the solvent. Ex situ XRD, XANES, and electrochemical data are used to determine the reversibility of the Co^2+/3+ redox center.

中文翻译：

微波辅助合成NaCoPO _4的红色相及其初步表征为钠离子电池的高压阴极

含过渡金属的聚阴离子化合物在钠离子电池（SIB）中用作阴极材料很有吸引力，因为在相同的M ^{n + /（n +1）+}氧化还原对的条件下，它们具有比氧化物类似物更高的固有电化学势。更高的能量密度。当使用常规方法时，NaMPO ₄（M =过渡金属）化合物具有驱动力以形成电化学惰性的马来石相。本文中，我们报告了使用四甘醇作为溶剂，在200°C下通过微波辅助溶剂热法合成NaCoPO ₄（NCP）多晶型物（“红”相）的过程。异位XRD，XANES和电化学数据可用于确定Co的可逆性^{2 + / 3 +}氧化还原中心。

更新日期：2017-01-20

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