Effect of a pyrrolidinium zwitterion on charge/discharge cycle properties of Li/LiCoO2 and graphite/Li cells containing an ionic liquid electrolyte
Effect of a pyrrolidinium zwitterion on charge/discharge cycle properties of Li/LiCoO2 and graphite/Li cells containing an ionic liquid electrolyte
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DOI：
10.1016/j.jpowsour.2016.09.058
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发表时间：
2016-11-01
影响因子：
9.2
通讯作者：
Rikukawa, Masahiro
中科院分区：
文献类型：
--
作者：
Yamaguchi, Seitaro;Yoshizawa-Fujita, Masahiro;Rikukawa, Masahiro
含有两性离子的离子液体(ILS)被用作锂离子电池(LIB)的电解液。研究了在IL电解液中添加吡咯烷两性离子对Li/LiCoO2和石墨/Li电池的热稳定性、电化学稳定性和充放电性能的影响。以3-(1-丁基吡咯烷基)丙烷-1-磺酸盐(BPYPS)为两性离子添加剂，N-甲基-N-丙基吡咯烷酰胺([P13][FSA])/双(三氟甲基磺酰)胺锂(LiTFSA)组成的离子液体电解质的热分解温度约为300℃，[P13][FSA]/LiTFSA/BPYPS的电化学窗口为0-+5.4V vs.Li/Li+，与[P13][FSA]/LiTFSA几乎相同。含有IL/BPYPS电解液体系的Li垂直条电解液垂直条LiCoO2电池，即使在50次循环后，也在3.0-4.6V的截止电压范围内表现出高容量。随着循环次数的增加，电解液与阴极之间的界面电阻增加受到抑制。在使用石墨电极的电池的循环伏安图中，锂离子在0和+0.4V范围内与Li/Li+发生了嵌入/脱嵌。此外，含有[P13][FSA]/LiTFSA/BPYPS的石墨垂直条电解液垂直条锂电池在50次循环中表现出稳定的充放电循环行为。(C)2016爱思唯尔B.V.保留所有权利。
Ionic liquids (ILs) containing zwitterions have been studied as electrolytes for lithium-ion batteries (LIBs). The effects of addition of a pyrrolidinium zwitterion in an IL electrolyte on the thermal and electrochemical stability and charge/discharge properties of Li/LiCoO2 and graphite/Li cells were investigated. The thermal decomposition temperature of the IL electrolyte composed of N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)amide ([P13][FSA])/lithium bis(trifluoromethylsulfonyl)amide (LiTFSA) with 3-(1-butylpyrrolidinium)propane-1-sulfonate (Bpyps) as the zwitterionic additive, the thermal decomposition temperature was about 300 degrees C. The electrochemical window of [P13][FSA]/LiTFSA/Bpyps was 0 -+5.4 V vs. Li/Li+, which was almost identical to that of [P13][FSA]/LiTFSA. Li vertical bar electrolyte vertical bar LiCoO2 cells containing the IL/Bpyps electrolyte system exhibited high capacities in the cut-off voltage range of 3.0 -4.6 V, even after 50 cycles. The increase in the interfacial resistance between the electrolyte and cathode with cycling was suppressed. In the cyclic voltammograms of cells employing a graphite electrode, the intercalation/deintercalation of lithium ions were observed in the range of 0 and + 0.4 V vs. Li/Li+. Further, graphite vertical bar electrolyte vertical bar Li cells containing [P13][FSA]/LiTFSA/Bpyps exhibited stable charge/discharge cycle behaviour over 50 cycles. (C) 2016 Elsevier B.V. All rights reserved.