Vanam Sai Pranav, Senthilkumar Baskar, Amonpattaratkit Penphitcha, Barpanda Prabeer
Faraday Materials Laboratory (FaMaL), Materials Research Centre, Indian Institute of Science, Bangalore 560012, India.
Amrita Center for Nanosciences and Molecular Medicine (ACNSMM), Amrita Vishwa Vidyapeetham, Kochi 682041, India.
Inorg Chem. 2022 Mar 7;61(9):3959-3969. doi: 10.1021/acs.inorgchem.1c03609. Epub 2022 Feb 24.
The rational design of novel cathode materials remains a key pursuit in the development of (post) Li-ion batteries. Considering the relative ionic and Stokes radii and open frameworks with large tunnels, Na-based compounds can act as versatile cathodes for monovalent Li-ion and post-Li-ion batteries. Here, tunnel-type sodium insertion material NaMnO is demonstrated as an intercalation host for Li-ion and K-ion batteries. The rod-shaped NaMnO was synthesized by a solution combustion method assuming an orthorhombic structure (space group ), which led to NaKMnO (NKMO) and NaLiMnO (NLMO) cathodes for K-ion batteries and Li-ion batteries, respectively, via facile electrochemical ion exchange from NaMnO. These new compositions, NKMO and NLMO, exhibited capacities of ∼74 and 141 mAh g, respectively (at a rate of C/20), with excellent cycling stability. The underlying mechanistic aspects (structural changes and charge storage mechanism) in these cathode compositions were probed by combining ex situ structural, spectroscopy, and electrochemical tools. Tunnel-type NaMnO forms a versatile cathode material for non-aqueous alkali-ion batteries.
新型阴极材料的合理设计仍然是（后）锂离子电池发展中的关键追求。考虑到相对离子半径和斯托克斯半径以及具有大隧道的开放框架，钠基化合物可作为用于单价锂离子和后锂离子电池的通用阴极。在此，隧道型钠插入材料NaMnO被证明是锂离子和钾离子电池的嵌入主体。通过溶液燃烧法合成了棒状NaMnO，假定其为正交结构（空间群），通过从NaMnO进行简便的电化学离子交换，分别得到了用于钾离子电池和锂离子电池的阴极NaKMnO（NKMO）和NaLiMnO（NLMO）。这些新组成，即NKMO和NLMO，分别表现出约74和141 mAh g的容量（在C/20的速率下），具有优异的循环稳定性。通过结合非原位结构、光谱和电化学工具，对这些阴极组成中的潜在机理方面（结构变化和电荷存储机制）进行了探究。隧道型NaMnO形成了一种用于非水碱离子电池的通用阴极材料。
