分别以 LiPF6、LiBOB 和 LiPF6/LiBOB 混合盐为电解质,研究了不同电解液对 LiFePO4/石墨动力电池高温循环性能的影响。结果表明,LiBOB 盐抑制了正极溶铁行为,并提高了正极高温循环充放电效率；由于 LiBOB基电解液对正极的保护及在负极表面良好的成膜作用,使得LiFePO4/石墨电池高温循环性能得到明显改善,但是增大了电池阻抗。LiPF6/Li-BOB混合盐可以发挥 LiBOB盐的优点增加正极稳定性,在石墨表面形成致密的 SEI 膜并能够有效改善电池高温循环性能,同时避免了单纯使用 LiBOB盐时阻抗较高的缺点。使用 LiPF6/LiBOB 混合盐,利用LiPF6盐低阻抗特性及 LiBOB盐对正、负电极的保护作用,可以有效提高电池电化学性能。
LiPF6 ,LiBOB and LiPF6/LiBOB blend salt-based electrolytes were investigated for improving cycling performances of LiFePO4/graphite lithium-ion batteries at elevated temperature.It was demonstrated that dis-solution of Fe from LiFePO4 was depressed in LiBOB based electrolyte,and columbic efficiency of LiFePO4/Li cell at elevated temperature was increased;LiBOB was reduced earlier on anode surface,forming compact SEI layer;and the capacity retention of LiFePO4/graphite cells at 55℃ increases with LiBOB concentration due to protective depositions of LiBOB on cathode surface and the SEI layer on anode surface,while the impedance of the cell is increased.LiPF6/LiBOB blend salt-based electrolyte combines the advantages of the different salts and maximizes the performance of cells.When electrolytes with LiPF6/LiBOB blend salt was used,the LiFe-PO4/graphite cells have excellent capacity retention at 55℃,while the impedance was dramatically decreased.
参考文献
| [1] | 冯哲圣,王焱,杨邦朝,向勇,赖玲庆.锂离子电池正极材料磷酸铁锂的研究现状[J].功能材料,2011(04):581-584. |
| [2] | 蒋志君.锂离子电池正极材料磷酸铁锂：进展与挑战[J].功能材料,2010(03):365-368. |
| [3] | Amine K;Liu J;Belharouak I .High-temperature storage and cycling of C-LiFePO4/graphite Li-ion cells[J].Electrochemistry communications,2005(7):669-673. |
| [4] | M. Safari;C. Delacourt .Aging of a Commercial Graphite/LiFePO_4 Cell[J].Journal of the Electrochemical Society,2011(10):A1123-A1135. |
| [5] | L. Castro;R. Dedryvere;J.-B. Ledeuil .Aging Mechanisms of LiFePO_4 // Graphite Cells Studied by XPS: Redox Reaction and Electrode/Electrolyte Interfaces[J].Journal of the Electrochemical Society,2012(4):A357-A363. |
| [6] | Koltypin M;Aurbach D;Nazar L et al.On the stability of LiFePO4 olivine cathodes under various conditions (e-lectrolyte solutions,temperature)[J].Electrochemical and Solid State Letters,2007,10(02):A40-A44. |
| [7] | Jae-Hun Kim;Sang Cheol Woo;Min-Sik Park;Ki Jae Kim;Taeeun Yim;Jeom-Soo Kim;Young-Jun Kim .Capacity fading mechanism of LiFePO_4-based lithium secondary batteries for stationary energy storage[J].Journal of Power Sources,2013(May 1):190-197. |
| [8] | Chia-Chin Chang;Te-Kang Chen;LI-Jane Her .Tris (pentafluorophenyl) borane as an Electrolyte Additive to Improve the High Temperature Cycling Performance of LiFePO_4 Cathode[J].Journal of the Electrochemical Society,2009(11):828-832. |
| [9] | Chang HH;Wu HC;Wu NL .Enhanced high-temperature cycle performance of LiFePO4/carbon batteries by an ion-sieving metal coating on negative electrode[J].Electrochemistry communications,2008(12):1823-1826. |
| [10] | Striebel K;Shim J;Sierra A et al.The development of low cost LiFePO4-based high power lithium-ion batteries[J].Journal of Power Sources,2005,146(1-2):33-38. |
| [11] | Li Wentao;Lucht B L .Inhibition of solid electrolyte in-terface formation on cathode particles for lithium-ion bat-teries[J].Journal of Power Sources,2007,168(01):258-264. |
| [12] | Liu H;Wang GX;Wexler D;Wang JZ;Liu HK .Electrochemical performance of LiFePO4 cathode material coated with ZrO2 nanolayer[J].Electrochemistry communications,2008(1):165-169. |
| [13] | Haishen Song;Zheng Cao;Xiong Chen;Hai Lu;Ming Jia;Zhian Zhang;Yanqing Lai;Jie Li;Yexiang Liu .Capacity fade of LiFePO4/graphite cell at elevated temperature[J].Journal of solid state electrochemistry,2013(3):599-605. |
| [14] | 蒲薇华,何向明,王莉,万春荣,姜长印.锂离子电池LiBOB电解质盐研究[J].化学进展,2006(12):1703-1709. |
| [15] | Shiyou Li;Yangyu Zhao;Xinming Shi;Bucheng Li;Xiaoli Xu;Wei Zhao;Xiaoling Cui.Effect of sulfolane on the performance of lithium bis(oxalato)borate-based electrolytes for advanced lithium ion batteries[J].Electrochimica Acta,2012:221-227. |
| [16] | Xu K;Zhang S S;Lee U et al.LiBOB:is it an alterna-tive salt for lithium ion chemistry[J].Journal of Power Sources,2005,146(1-2):79-85. |
| [17] | 谭晓兰,程新群,马玉林,左朋建,尹鸽平.LiBOB基电解液成膜性及其循环性能[J].物理化学学报,2009(10):1967-1971. |
| [18] | Sai Wang;Weihua Qiu;Yunlong Guan;Bitao Yu;Hailei Zhao;Wei Liu .Electrochemical characteristics of LiM{sub}xFe{sub}(1-x)PO{sub}4 cathode with LiBOB based electrolytes[J].Electrochimica Acta,2007(15):4907-4910. |
| [19] | Kang Xu;Shengshui Zhang;T. Richard Jow .Formation of the Graphite/Electrolyte Interface by Lithium Bis(oxalato) borate[J].Electrochemical and solid-state letters,2003(6):A117-A120. |
| [20] | Yancheng Zhang;Chao-Yang Wang;Xidong Tang .Cycling degradation of an automotive LiFePO_4 lithium-ion battery[J].Journal of Power Sources,2011(3):1513-1520. |
| [21] | D.P. Abraham;M.M. Furczon;S.-H. Kang;D.W. Dees;A.N. Jansen .Effect of electrolyte composition on initial cycling and impedance characteristics of lithium-ion cells[J].Journal of Power Sources,2008(1):612-620. |
| [22] | D. Bar-Tow;E. Peled;L. Burstein .A study of highly oriented pyrolytic graphite as a model for the graphite anode in Li-Ion batteries[J].Journal of the Electrochemical Society,1999(3):824-832. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%