Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 48, Pages 32637-32642Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12085
Keywords
lithium-ion battery; separator; electrolyte conductivity; lithium-ion transference number; surface modification; polyelectrolyte; layer-by-layer
Funding
- ETH Energy Science Center Seed Fund [2-72013-14]
- ETH Research Grant [0-20978-14]
- Swiss National Science Foundation [2-77078-14]
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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.
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