Preparation and electrochemical properties of composite polymer electrolytes containing 1-ethyl-3-methylimidazolium tetrafluoroborate salts

Seok Kim; Soo Jin Park

doi:10.1016/j.electacta.2009.01.070

Preparation and electrochemical properties of composite polymer electrolytes containing 1-ethyl-3-methylimidazolium tetrafluoroborate salts

Seok Kim
, Soo Jin Park

Department of Chemical Engineering
Pusan National University
Inha University

Research output: Contribution to journal › Article › peer-review

41 Citations (Scopus)

Abstract

The effects of room-temperature molten salt addition on the micro-structure and electrochemical properties of composite electrolytes (CEs) based on poly(ethylene oxide) (PEO)/ethylene carbonate (EC)/LiBF₄ were studied. Additional salt, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF₄), was found to influence the crystalline structure and heterogeneous morphology, resulting in changes to the ionic conductivity of the CE. The CE containing 0.2 mol of EMIBF₄ showed a small crystallinity, 27.9%. These CEs showed the highest ion conductivity, 3.1 × 10^-4 S/cm, five times higher than that of the pristine PEO/EC/LiBF₄. This enhanced conductivity originated from the decreased crystallinity and improved ion transference due to a Lewis acid-base interaction. The CE containing 0.3 mol of EMIBF₄ showed decreased conductivity due to the lower mobility, reflecting the high viscosity of the molten salt.

Original language	English
Pages (from-to)	3775-3780
Number of pages	6
Journal	Electrochimica Acta
Volume	54
Issue number	14
DOIs	https://doi.org/10.1016/j.electacta.2009.01.070
Publication status	Published - 30 May 2009
Externally published	Yes

Keywords

Composite electrolyte
Ion-conducting behavior
Lithium cell
Molten salt
Polyethylene oxide

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10.1016/j.electacta.2009.01.070

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title = "Preparation and electrochemical properties of composite polymer electrolytes containing 1-ethyl-3-methylimidazolium tetrafluoroborate salts",

abstract = "The effects of room-temperature molten salt addition on the micro-structure and electrochemical properties of composite electrolytes (CEs) based on poly(ethylene oxide) (PEO)/ethylene carbonate (EC)/LiBF4 were studied. Additional salt, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4), was found to influence the crystalline structure and heterogeneous morphology, resulting in changes to the ionic conductivity of the CE. The CE containing 0.2 mol of EMIBF4 showed a small crystallinity, 27.9\%. These CEs showed the highest ion conductivity, 3.1 {\texttimes} 10-4 S/cm, five times higher than that of the pristine PEO/EC/LiBF4. This enhanced conductivity originated from the decreased crystallinity and improved ion transference due to a Lewis acid-base interaction. The CE containing 0.3 mol of EMIBF4 showed decreased conductivity due to the lower mobility, reflecting the high viscosity of the molten salt.",

keywords = "Composite electrolyte, Ion-conducting behavior, Lithium cell, Molten salt, Polyethylene oxide",

author = "Seok Kim and Park, \{Soo Jin\}",

year = "2009",

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journal = "Electrochimica Acta",

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T1 - Preparation and electrochemical properties of composite polymer electrolytes containing 1-ethyl-3-methylimidazolium tetrafluoroborate salts

AU - Kim, Seok

AU - Park, Soo Jin

PY - 2009/5/30

Y1 - 2009/5/30

N2 - The effects of room-temperature molten salt addition on the micro-structure and electrochemical properties of composite electrolytes (CEs) based on poly(ethylene oxide) (PEO)/ethylene carbonate (EC)/LiBF4 were studied. Additional salt, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4), was found to influence the crystalline structure and heterogeneous morphology, resulting in changes to the ionic conductivity of the CE. The CE containing 0.2 mol of EMIBF4 showed a small crystallinity, 27.9%. These CEs showed the highest ion conductivity, 3.1 × 10-4 S/cm, five times higher than that of the pristine PEO/EC/LiBF4. This enhanced conductivity originated from the decreased crystallinity and improved ion transference due to a Lewis acid-base interaction. The CE containing 0.3 mol of EMIBF4 showed decreased conductivity due to the lower mobility, reflecting the high viscosity of the molten salt.

AB - The effects of room-temperature molten salt addition on the micro-structure and electrochemical properties of composite electrolytes (CEs) based on poly(ethylene oxide) (PEO)/ethylene carbonate (EC)/LiBF4 were studied. Additional salt, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4), was found to influence the crystalline structure and heterogeneous morphology, resulting in changes to the ionic conductivity of the CE. The CE containing 0.2 mol of EMIBF4 showed a small crystallinity, 27.9%. These CEs showed the highest ion conductivity, 3.1 × 10-4 S/cm, five times higher than that of the pristine PEO/EC/LiBF4. This enhanced conductivity originated from the decreased crystallinity and improved ion transference due to a Lewis acid-base interaction. The CE containing 0.3 mol of EMIBF4 showed decreased conductivity due to the lower mobility, reflecting the high viscosity of the molten salt.

KW - Composite electrolyte

KW - Ion-conducting behavior

KW - Lithium cell

KW - Molten salt

KW - Polyethylene oxide

UR - https://www.scopus.com/pages/publications/64049112589

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DO - 10.1016/j.electacta.2009.01.070

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SN - 0013-4686

VL - 54

SP - 3775

EP - 3780

JO - Electrochimica Acta

JF - Electrochimica Acta

IS - 14

ER -

Preparation and electrochemical properties of composite polymer electrolytes containing 1-ethyl-3-methylimidazolium tetrafluoroborate salts

Abstract

Keywords

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