Improving Ionic Conductivity and Lithium-Ion Transference Number in Lithium-Ion Battery Separators

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• 作者：Raphael Zahn ; Marie Francine Lagadec ; Michael Hess ; Vanessa Wood
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：December 7, 2016
• 年：2016
• 卷：8
• 期：48
• 页码：32637-32642
• 全文大小：459K
• ISSN：1944-8252

文摘

The microstructure of lithium-ion battery separators plays an important role in separator performance; however, here we show that a geometrical analysis falls short in predicting the lithium-ion transport in the electrolyte-filled pore space. By systematically modifying the surface chemistry of a commercial polyethylene separator while keeping its microstructure unchanged, we demonstrate that surface chemistry, which alters separator–electrolyte interactions, influences ionic conductivity and lithium-ion transference number. Changes in separator surface chemistry, particularly those that increase lithium-ion transference numbers can reduce voltage drops across the separator and improve C-rate capability.