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Research on Functional Electrolytes for Lithium Ion Battery

Author: ZhangXinYue
Tutor: YangLi
School: Shanghai Jiaotong University
Course: Chemical Engineering and Technology
Keywords: lithium ion battery functional electrolyte additives lithium iron phosphate lithium manganate
CLC: TM912
Type: Master's thesis
Year: 2012
Downloads: 233
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Abstract


Ionic liquids （ILs） have received considerable attentions for application as potential electrolytes or electrolyte additives in lithium ion batteries due to their unique properties, such as negligible volatility, non-flammability and high thermal stability. In this thesis, N-methyl-N-propylcyanide morpholinium bis（trifluoromethylsulfonyl） imide （CNMorTFSI） was used as conventional electrolyte 1M LiPF6/EC:DMC（1:1, Vol） additive for LiMn2O4/Li battery. Cycling test at 1C rate between 2.5-4.0V revealed that for the LiMn2O4/Li cell, no deterioration of cell performance was observed when 10wt% CNMorTFSI was added to the conventional electrolyte, moreover, the performance was superior to that of the cell with 10wt% 1-ethyl-3-methylimidazolium bis（trifluoromethylsulfonyl） imide （EtMeImTFSI） as additive.Lithium iron phosphate （LiFePO4）, which has a high theoretical capacity, low cost, and low environmental impact, is considered to be the most promising cathode material for lithium ion batteries. In this thesis, LiFePO4/MCMB cells with bi-solvent, tri-solvent or tetra-solvent electrolyte systems incorporating various additives were tested, wherein, cycling performances was tested under 25°C, 55°C and -20°C, respectively.The cell performances of LiFePO4/MCMB with 1mol L-1 LiPF6 /EC:EMC （1:2, Vol） were tested. The results revealed that the cells with SEI forming improver additives exhibited better cycling performances than that without additives at 25°C, but showed unfavorable cycling performances at 55°C.The cell performances of LiFePO4/MCMB with 1mol L-1 LiPF6 /EC:EMC:DMC（1:1:1, Vol） were tested. The results revealed that the cells with one SEI forming improver additive exhibited better cycling performances than that without additive at 25°C; addition of binary additives improved the cycling performances at 25°C but the cells showed unfavorable battery performances at 55°C or -20°C. LiFePO4/MCMB cell with 1mol L-1 LiPF6 /EC:EMC:DMC（1:1:1, Vol）+2.0wt% PA1+2.0wt% DA1+0.7wt% LA1 exhibited better performances at 25°C, 55°C and -20°C than that with commercialized electrolyte 8022; this electrolyte could be used as an alternate conventional electrolyte.The cell performances of LiFePO4/MCMB with 1mol L-1 LiPF6 /EC:DMC:DEC:EMC （1:1:1:3, Vol） were also tested. The cells exhibited unfavorable performances without and with additives at 25°C and 55°C.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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