论文标题
可充电钾离子电池的潜在阴极材料诱导锰阳离子和氧阴离子氧化还原化学：缺陷钾$ \ rm k_ {0.4} fe_ {0.5} mn_ {0.5} mn_ {0.5}
A Potential Cathode Material for Rechargeable Potassium-Ion Batteries Inducing Manganese Cation and Oxygen Anion Redox Chemistry: Potassium-Deficient $\rm K_{0.4}Fe_{0.5}Mn_{0.5}O_2$
论文作者
论文摘要
钾离子（$ \ rm k $ -ion）可充电电池；近年来，被认为是大规模和宽敞的储能系统的有利可图的低成本电池选项，引起了极大的关注。但是，由于稀缺的阴极材料可以容忍可逆的$ \ rm k $ - $ k $ ions的可逆插入，因此$ \ rm k $ -ion电池的生存能力已大大降低了。在本文中，我们探索了$ \ rm k_2o $ - $ \ rm fe_2o_3 $ - $ \ $ \ rm mno_2 $ ternary阶段系统中的潜在天主电气材料，不仅展示了可逆的$ \ rm k $ -ion重新插入，而且表现出相对快速的利率能力。标题为“阴极化合物”，$ \ rm k_ {0.4} fe_ {0.5} mn_ {0.5} o_2 $，证明了可逆能力约为$ \ rm120 $ \ rm120 $ \ rmah g $^{ - 1} $，以$ \ \ rm 10 $ 10 $的费用（$ viz。 85 $％的容量保留为$ \ rm 1 $小时的（dis）费用（$ \ rm 1 c $ rate），这被认为是良好的容量保留率。此外，已经采用了硬X射线和软X射线来揭示$ \ rm k $ -ion可逆地插入$ \ rm k_ {0.4} fe_ {0.5} mn_ {0.5} o_2 $的机制。结果表明，锰阳离子和氧阴离子在$ \ rm k_ {0.4} fe_ {0.5} mn_ {0.5} o_2 $中都有累积参与，这说明了其潜在的潜力，以依赖于阴离子和阳离子的阳离子和阳离子氧化物，这是一种高能力$ \ rm k $ rm k $ rm-ion电池阴极的材料。可以预期的相关高容量阴极组成的进一步发展。
Potassium-ion ($\rm K$-ion) rechargeable batteries; considered to be lucrative low-cost battery options for large-scale and capacious energy storage systems, have been garnering tremendous attention in recent years. However, due to the scarcity of cathode materials that can condone the reversible re-insertion of the large $\rm K$-ions at feasible capacities, the viability of $\rm K$-ion batteries has been greatly undercut. In this paper, we explore a potential cathode material in the $\rm K_2O$-$\rm Fe_2O_3$-$\rm MnO_2$ ternary phase system, that not only demonstrates reversible $\rm K$-ion reinsertion but also manifests relatively fast rate capabilities. The titled cathode compound, $\rm K_{0.4}Fe_{0.5}Mn_{0.5}O_2$, demonstrates a reversible capacity of approximately $\rm120 $ mAh g$^{-1}$ at $\rm 10$ hours of (dis)charge ($viz.$, $\rm C/10$ rate) with $ca.$ $\rm 85$% of the capacity being retained at a $\rm 1$ hour of (dis)charge ($\rm 1 C$ rate) which is considered to be good capacity retention. Additionally, both hard and soft X-rays have been employed to unravel the mechanism by which $\rm K$-ion is reversibly inserted into $\rm K_{0.4}Fe_{0.5}Mn_{0.5}O_2$. The results revealed a cumulative participation of both manganese cations and oxygen anions in $\rm K_{0.4}Fe_{0.5}Mn_{0.5}O_2$ illustrating its potential as a high-capacity $\rm K$-ion battery cathode material that relies on both anion and cation redox. Further development of related high-capacity cathode compositions can be anticipated.
