【摘要】 为了提高磷酸铁锂（LiFePO₄）电池在宽温度范围内的性能,研究LiBF₄-LiBOB复合盐和LiTFSI-LiBOB复合盐用于替代LiPF₆作为非水电解质的锂盐。分别通过恒流充放电测试、循环伏安测试和热重分析法研究使用LiPF₆,LiBF₄-LiBOB和LiTFSI-LiBOB作为锂盐的LiFePO₄/Li半电池的性能。结果显示:LiBF₄-LiBOB和LiTFSI-LiBOB复合盐的热稳定性高于LiPF₆;在LiTFSI基电解液中添加LiBOB可以提高铝箔的抗腐蚀性;使用LiBF₄-LiBOB和LiTFSI-LiBOB复合盐的电池电化学性能相对于使用LiPF₆的电池有明显改善。因此LiBF₄-LiBOB和LiTFSI-LiBOB复合盐电解液可以用来改善锂电池宽温度范围下的性能。更多还原

【Abstract】 To achieve good performance for LiFePO4-based batteries operated at a wide temperature range,mixed salts of LiBF4 LiBOB（lithium bis（oxalato）borate） and LiTFSI（lithium bis（trifluoromethanesulfonyl）imide）-LiBOB were investigated as alternative lithium salts to LiPF₆ in non-aqueous electrolytes.LiFePO₄/Li half cells using LiPF₆,LiBF₄-LiBOB and LiTFSI-LiBOB slats as lithium salts were investigated by galvanostatic cycling,cyclic voltammetry,thermogravimetric analysis.The results show that LiBF₄-LiBOB and LiTFSI-LiBOB mixed salts are much more thermally stable than LiPF₆.Corrosion of Al foil in the LiTFSI-based electrolytes can be suppressed successfully by the addition of LiBOB as a co-salt.The electrochemical performance of LiBF₄-LiBOB and LiTFSI-LiBOB mixed salts based cells are both better than that of LiPF6-based cell.LiTFSI-LiBOB mixed salt based electrolyte is considered to be a very promising electrolyte candidate for Li-ion batteries that will be used in wide-temperature applications.更多还原