Huang Yongfa, Ding Rui, Ying Danfeng, Yan Tong, Huang Yuxi, Tan Caini, Sun Xiujuan, Gao Ping, Liu Enhui
College of Chemistry, Xiangtan University (XTU), Xiangtan, Hunan, 411105 (P.R., China.
Chemistry. 2021 Jul 7;27(38):9954-9960. doi: 10.1002/chem.202101043. Epub 2021 May 26.
Na-ion capacitors (NICs) and Na-based dual-ion batteries (Na-DIBs) have been considered to be promising alternatives to traditional lithium-ion batteries (LIBs) because of the abundance and low cost of the Na-ion, but their energy density, power density and life cycle are limited. Herein, dual-vacancy (including K and F vacancies) perovskite fluoride K MnF @reduced graphene oxide (rGO; recorded as Mn-G) as anode for NICs and Na-DIBs has been developed. The special conversion/intercalation dual Na-ion energy storage mechanism and pseudocapacitive dynamics are analyzed in detail. The Mn-G//AC NICs and Mn-G//KS6 Na-DIBs delivered a maximum energy density of 92.7 and 187.6 W h kg , a maximum power density of 20.2 and 21.12 kW kg , and long cycle performance of 61.3 and 68.4 % after 1000 cycles at 5 A g , respectively. Moreover, Mn-G//AC NICs and Mn-G//KS6 Na-DIBs can work well over a wide range of temperatures (-20 to 40 °C). These results make it competitive in Na-ion storage applications with high energy/power density over a wide temperature range.
钠离子电容器（NICs）和钠基双离子电池（Na-DIBs）由于钠离子储量丰富且成本低廉，被认为是传统锂离子电池（LIBs）颇具前景的替代品，但其能量密度、功率密度和循环寿命有限。在此，已开发出具有双空位（包括钾和氟空位）的钙钛矿氟化物KMnF@还原氧化石墨烯（rGO；记为Mn-G）作为NICs和Na-DIBs的负极。详细分析了特殊的转化/嵌入双钠离子储能机制和赝电容动力学。Mn-G//AC NICs和Mn-G//KS6 Na-DIBs的最大能量密度分别为92.7和187.6 W h kg，最大功率密度分别为20.2和21.12 kW kg，在5 A g下1000次循环后的长循环性能分别为61.3%和68.4%。此外，Mn-G//AC NICs和Mn-G//KS6 Na-DIBs在很宽的温度范围（-20至40 °C）内都能良好工作。这些结果使其在宽温度范围内具有高能量/功率密度的钠离子存储应用中具有竞争力。
