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Solvent‐Phobic and Ionophilic Carboxylated Polythiophene Layer for Fluoride‐Rich Cathode Electrolyte Interphase

Journal Article · · Advanced Energy Materials
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [4];  [3];  [1]
  1. Department of Chemical and Bimolecular Engineering Lehigh University Bethlehem PA 18015 USA
  2. Institute of Sustainability, Environment and Energy Stony Brook University Stony Brook New York 11794 USA
  3. Institute of Sustainability, Environment and Energy Stony Brook University Stony Brook New York 11794 USA, Interdisciplinary Science Department Brookhaven National Laboratory Upton, New York 11973 USA, Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook New York 11794 USA, Department of Chemistry Stony Brook University Stony Brook New York 11794 USA
  4. Institute of Sustainability, Environment and Energy Stony Brook University Stony Brook New York 11794 USA, Interdisciplinary Science Department Brookhaven National Laboratory Upton, New York 11973 USA

Abstract

One focal area of contemporary organic mixed ionic‐electronic conductor (OMIEC) research relates to utilization of dual‐conductive properties to enhance the ion/electron transfer kinetics for energy storage applications. Insight regarding OMIEC response toward the electrolyte anion and solvent used in lithium‐ion batteries (LIBs), however, is limited. Here, for the first time, the solvent‐phobic and ionophilic (SP‐IP) properties of the OMIEC, poly[3‐(potassium‐4‐butanoate)thiophene‐2,5‐diyl] (P3KBT), are revealed through comprehensive evaluation and characterization. The solvent‐phobic characteristics arise from the cooperation of dispersive interaction, polar interaction, and hydrogen‐bonding between P3KBT and electrolyte solvent. The ionophilic nature is driven by electrostatic interactions between P3KBT side chain carboxylate groups and LiPF 6 , and the reversible electrochemical doping/de‐doping of the polythiophene backbone with PF 6 . The SP‐IP properties induce formation of a LiF‐ rich , Li 2 CO 3 ‐ limited cathode electrolyte interphase (CEI) layer when a P3KBT coating layer is applied to the active material surface, significantly improving half‐cell life to over 1500 cycles at 2C.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0012673; AC02-76SF00515
OSTI ID:
2536738
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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