几种有前景锂盐在锂离子电池中的研究进展
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摘要
锂离子电池电解质作为锂离子电池的重要组成部分,对电池性能有着重要影响,而传统的六氟磷酸锂(LiPF_6)由于热稳定性差、对水敏感等缺点已不能满足人们的需求,因此开发新型锂盐越发迫切。就几种有良好运用前景的锂盐,包括二氟草酸硼酸锂(LiDFOB),双三氟甲基磺酰亚胺锂(LiTFSI),双氟磺酰亚胺锂(LiFSI)及二氟磷酸锂(LiDFP),对其在导电性、热稳定性、与石墨负极的相容性及电化学性能等方面进行分析介绍,并对其今后发展前景进行了展望。
The lithium salt as an essential component of lithium ion batteries, has great influence on its performance,yet the traditional lithium hexafluorophosphate(LiPF6) cannot satisfy people's increasing demands due to its poor thermal stability, sensitive to water and so on, thus new lithium salts are in great need. In this paper, several lithium salts with good prospects in lithium ion batteries were discussed, including lithium difluoro(oxalate) borate(LiDFOB),lithium bis(trifluoromethanesulfonyl)imide(LiTFSI), lithium bis(fluorosulfonyl) imide(LiFSI) and lithium difluorophosphate(LiDFP). Their electrical conductivity, thermal stability, compatibility with graphite electrode and the electrochemical properties were analyzed and summarized, and the future development direction and prospects were also discussed.
The lithium salt as an essential component of lithium ion batteries, has great influence on its performance,yet the traditional lithium hexafluorophosphate(LiPF6) cannot satisfy people's increasing demands due to its poor thermal stability, sensitive to water and so on, thus new lithium salts are in great need. In this paper, several lithium salts with good prospects in lithium ion batteries were discussed, including lithium difluoro(oxalate) borate(LiDFOB),lithium bis(trifluoromethanesulfonyl)imide(LiTFSI), lithium bis(fluorosulfonyl) imide(LiFSI) and lithium difluorophosphate(LiDFP). Their electrical conductivity, thermal stability, compatibility with graphite electrode and the electrochemical properties were analyzed and summarized, and the future development direction and prospects were also discussed.
引文
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[20] KIM K E,JANG J Y,PARK I,et al. A combination of lithium di-fluorophosphate and vinylene carbonate as reducible additives toimprove cycling performance of graphite electrodes at high rates[J]. Electrochemistry Communications,2015,61:121-124.
[21] YANG B,ZHANG H,YU L,et al. Lithium difluorophosphate asan additive to improve the low temperature performance of Li-Ni0.5Co0.2Mn0.3O2/graphite cells[J]. Electrochimica Acta,2016,221:107-114.
[2] LI J,XIE K,LAI Y,et al. Lithium oxalyldifluoroborate/carbonateelectrolytes for LiFePO4/artificial graphite lithium-ion cells[J]. JPower Sources,2010,195:5344-5350.
[3] FU M H,HUANG K L,LIU S Q,et al. Lithium difluoro(oxalato)bo-rate/ethylene carbonate+propylene carbonate+ethyl(methyl)car-bonate electrolyte for LiMn2O4cathode[J]. J Power Sources,2010,195:862-866.
[4]周宏明,刘芙蓉,李荐,等.LiODFB基电解液的电化学性能及其与钛酸锂的相容性研究[J].无机材料学报,2013,28(5):507-514.
[5] ZHOU H M,FANG Z Q,LI J. LiPF6and lithium difluoro(oxalato)borate/ethylene carbonate+dimethyl carbonate+ethyl(methyl)car-bonate electrolyte for Li4Ti5O12anode[J]. J Power Sources,2013,230:148-154.
[6]陈果,刘立炳,惠怀兵,等. LiDFOB用于锂离子电池电解液添加剂的性能研究[J].电源技术,2015,139(7):1387-1389.
[7] DAHBI M,CHAMOUSS F,TRAN-VAN F,et al.Comparative studyof EC/DMC LiTFSI and LiPF6electrolytes for electrochemical stor-age[J].J Power Sources,2011,196:9743-9750.
[8] CHEN X,XU W,ENGELHARD M H,et al. Mixed salts of LiTFSIand LiBOB for stable LiFePO4-based batteries at elevated tempera-tures[J].J Mater Chem A,2014,2:2346-2352.
[9] HAN H B,ZHOU S S,ZHANG D J,et al.Lithium bis(fluorosul-fonyl)imide(LiFSI)as conducting salt for nonaqueous liquid elec-trolytes for lithium-ion batteries:Physicochemical and electrochemi-cal properties[J].J Power Sources,2011,196:3623-3632.
[10] LI F,GONG Y,JIA G,et al. A novel dual-salts of LiTFSI and Li-ODFB in LiFePO4-based batteries for suppressing aluminum corro-sion and improving cycling stability[J]. J Power Sources,2015,295:47-54.
[11]王青磊,李法强,贾国凤,等.混合锂盐LiTFSI-LiODFB基电解液的高温性能[J].电池,2016,46(4):177-180.
[12] KANAMURA K,UMEGAKI T,SHIRAISHI S,et al. Electroche-mical behavior of Al current collectors in lithium-ion batteries[J]. JElectrochem Soc,2002,149(2):A185-A194.
[13] KALHOFF J,BRESSER D,BOLLOLI M,et al. Enabling LiTFSI-based electrolytes for safer lithium-ion batteries by using linear flu-orinated carbonates as(Co)solvent[J]. Chem Sus Chem,2014,7:2939-2946.
[14] MATSUMOTO K,INOUE K,NAKAHARA K,et al. Suppressionof aluminum corrosion by using high concentration LiTFSI elec-trolyte[J]. J Power Sources,2013,231:234-238.
[15] LI L,ZHOU S,HAN H,et al. Transport and electrochemical pro-perties and spectral features of non-aqueous electrolytes containingLiFSI in linear carbonate solvents[J]. J the Electrochemical Soci-ety,2011,158(2):A74-A82.
[16] ABOUIMRANE A,DING J,DAVIDSON I J. Liquid electrolytebased on lithium bis-fluorosulfonyl imide salt:Aluminum corrosionstudies and lithium ion battery investigations[J]. J Power Sources,2009,189:693-696.
[17] ESHETU G G,GRUGEON S,GACHOT G,et al. LiFSI vs. LiPF6electrolytes in contact with lithiated graphite:Comparing thermalstabilities and identification of specific SEI-reinforcing additives[J]. Electrochimica Acta,2013,102:133-141.
[18] SHANGGUAN X,JIA G,LI F,et al. Mixed salts of LiFSI and Li-ODFB for stable LiCoO2-based batteries[J]. J the ElectrochemicalSociety,2016,163(13):A2797-A2802.
[19] PHILIPPE B,DEDRYVERE R,GORGOI M,et al.Improved per-formances of nanosilicon electrodes using the salt lifsi:a photoelec-tron spectroscopy study[J].J Am Chem Soc,2013,135:9829-9842.
[20] KIM K E,JANG J Y,PARK I,et al. A combination of lithium di-fluorophosphate and vinylene carbonate as reducible additives toimprove cycling performance of graphite electrodes at high rates[J]. Electrochemistry Communications,2015,61:121-124.
[21] YANG B,ZHANG H,YU L,et al. Lithium difluorophosphate asan additive to improve the low temperature performance of Li-Ni0.5Co0.2Mn0.3O2/graphite cells[J]. Electrochimica Acta,2016,221:107-114.