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Solid-state rigid-rod polymer composite electrolytes with nanocrystalline lithium ion pathways

Journal Article · · Nature Materials
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [3];  [2]
  1. Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States); Virginia Tech
  2. Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
  3. Deakin University, Geelong, VIC (Australia)
  4. Chinese Academy of Science, Dongguan (China)
  5. University of North Carolina at Chapel Hill, NC (United States)
A critical challenge for next-generation lithium-based batteries lies in development of electrolytes that enable thermal safety along with use of high-energy-density electrodes. We describe molecular ionic composite (MIC) electrolytes based on an aligned liquid crystalline polymer combined with ionic liquids and concentrated Li salt. This high strength (200 MPa) and non-flammable solid electrolyte possesses outstanding Li+ conductivity (1 mS cm-1 at 25 °C) and electrochemical stability (5.6 V vs Li|Li+) while suppressing dendrite growth and exhibiting low interfacial resistance (32 Ω cm2) and overpotentials (≤ 120 mV @ 1 mA cm-2) during Li symmetric cell cycling. A heterogeneous salt doping process modifies a locally ordered polymer-ion assembly to incorporate an inter-grain network filled with defective LiFSI & LiBF4 nanocrystals, strongly enhancing Li+ conduction. Furthermore, this modular material fabrication platform shows promise for safe and high-energy-density energy storage and conversion applications, incorporating the fast transport of ceramic-like conductors with the superior flexibility of polymer electrolytes.
Research Organization:
Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
US National Science Foundation; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO). Batteries for Advanced Transportation Technologies (BATT) Program
Grant/Contract Number:
EE0008860
OSTI ID:
2006632
Alternate ID(s):
OSTI ID: 1848919
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 9 Vol. 20; ISSN 1476-1122
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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Double helical conformation and extreme rigidity in a rodlike polyelectrolyte journal February 2019

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