Effect of interface modifications on voltage fade in 0.5Li₂MnO₃路0.5LiNi_0.375Mn_0.375Co_0.25O₂ cathode materials

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• 作者：Ira Bloom ; Lynn Trahey ; Ali Abouimrane ; Ilias Belharouak ; Xiaofeng Zhang ; Qingliu Wu ; Wenquan Lu ; Daniel P. Abraham ; Martin Bettge ; Jeffrey W. Elam ; Xiangbo Meng ; Anthony K. Burrell ; Chunmei Ban ; Robert Tenent ; Jagjit N ; a ; Nancy Dudney
• 关键词：Lithium-ion batteries ; Composite cathode materials ; Voltage fade ; Coatings ; Electrolyte additives
• 刊名：Journal of Power Sources
• 出版年：1 March, 2014
• 年：2014
• 卷：249
• 期：Complete
• 页码：509-514
• 全文大小：1279 K

文摘

The effects of the coatings Al₂O₃, LiAlO_x, ZrO₂, TiO₂, AlPO₄, and LiPON and of the electrolyte additives 3-hexylthiophene and lithium difluoro (oxalato)borate (LiDFOB) on the voltage fade phenomenon in 0.5Li₂MnO₃路0.5LiNi_0.375Mn_0.375Co_0.25O₂ cathodes were investigated. Cells containing these materials or additives were cycled according to a standard protocol at room temperature between 2.0 and 4.7聽V vs. Li⁺/Li. As expected, the cells containing either an additive or a coated cathode displayed less capacity loss than cells containing an uncoated cathode and no additive. The voltage fade phenomenon was quantified in terms of changes in the average cell voltage (Wh/Ah). The results indicate that, within experimental error, all of the coatings and additives produced little-to-no effect on voltage fade.