High-Performance Lithium-Ion Hybrid Supercapacitors Based on Lithium Salt/Imidazolium Ionic Liquid Electrolytes and Ni-Doped LiMn2O4 Cathode Materials,ACS Applied Energy Materials

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High-Performance Lithium-Ion Hybrid Supercapacitors Based on Lithium Salt/Imidazolium Ionic Liquid Electrolytes and Ni-Doped LiMn2O4 Cathode Materials
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-09-04 , DOI: 10.1021/acsaem.0c01435
Garbas A. dos Santos Junior ₁ , Victor D. S. Fortunato ₁ , Grasielli A. A. Bastos _{1,

2} , Glaura G. Silva _{1,

2} , Paulo F. R. Ortega ₃ , Rodrigo L. Lavall _{1,

2}

Affiliation

In this work, we evaluate the effect of Ni-doping LiMn₂O₄ spinels, LiNi_xMn_2–xO₄ (0.01 ≤ x ≤ 0.10) on the performance of lithium-ion hybrid supercapacitors (Li-HSCs) based on a mixture of 1 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and a 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI) ionic liquid (IL) as the electrolyte and mesoporous carbon as the anode. Although the positive contribution of metal doping of lithium-ion insertion materials in the electrochemical properties is known for Li-ion batteries, this effect is little studied in battery/supercapacitor hybrid full cells based on these compounds, especially with the use of electrolytes based on ionic liquids at room temperature. This issue is addressed in the present work. Among all studied devices, the Li-HSC based on LiNi_0.01Mn_1.99O₄ was able to deliver the highest energy density values, in the range of 21.7–40.9 W h kg^–1. Also, the devices based on low nickel-content spinels (x ≤ 0.03) showed high performance with excellent cycling stability, being able to retain around 79–85% of its initial energy density after 1500 cycles of charge/discharge at 400 mA g^–1.

中文翻译：

基于锂盐/咪唑离子液体电解质和掺Ni的LiMn ₂ O ₄阴极材料的高性能锂离子混合超级电容器

在这项工作中，我们评估镍掺杂的LiMn的效果₂ Ò ₄尖晶石，的LiNi _X锰_{2- X} ø ₄（0.01≤ X≤0.10）基于1 M双（三氟甲磺酰基）酰亚胺锂（LiTFSI）和1-乙基-3-甲基咪唑双（三氟甲基磺酰基）酰亚胺（EMITFSI）的混合物的锂离子混合超级电容器（Li-HSC）的性能离子液体（IL）作为电解质，中孔碳作为阳极。尽管对于锂离子电池来说，锂离子插入材料的金属掺杂对电化学性能的积极贡献是众所周知的，但在基于这些化合物的电池/超级电容器混合全电池中，尤其是在使用基于锂的电解质的情况下，对这种效应的研究很少。室温下的离子液体。本工作将解决此问题。在所有研究的器件中，基于LiNi _0.01 Mn _1.99 O ₄的Li-HSC能够提供最高的能量密度值，范围为21.7–40.9 W h kg ^–1。同时，该装置根据低镍含量的尖晶石（X ≤0.03）表现出较高的性能具有优异的循环稳定性，能够以400mA克1500个循环的充电/放电后保留周围79-85％的初始能量密度的^{- 1}。

更新日期：2020-09-28

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