scholarly journals Li+ Cation Diffusion in Ionic Liquid Electrolyte and Rate Capability of Lithium Secondary Battery

2012 ◽  
Keyword(s):  
Ionic Liquid ◽  
Rate Capability ◽  
Liquid Electrolyte ◽  
Cation Diffusion ◽  
Lithium Secondary Battery ◽  
Ionic Liquid Electrolyte ◽  
Secondary Battery

scholarly journals Ordered LiNi0.5Mn1.5O4 Cathode in Bis(fluorosulfonyl)imide-Based Ionic Liquid Electrolyte: Importance of the Cathode-Electrolyte Interphase

2020 ◽  
Author(s):  
Hyeon Jeong Lee ◽  
Zachary Brown ◽  
Ying Zhao ◽  
Jack Fawdon ◽  
Weixin Song ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
High Voltage ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Performance ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Energy Density ◽  
X Ray ◽  
Ionic Liquid Electrolyte

<div><div><div><p>The high voltage (4.7 V vs. Li+ /Li) spinel lithium nickel manganese oxide (LiNi0.5 Mn1.5 O4 , LNMO) is a promising candidate for the next-generation of lithium ion batteries due to its high energy density, low cost and environmental impact. However, poor cycling performance at high cutoff potentials limits its commercialization. Herein, hollow structured LNMO is synergistically paired with an ionic liquid electrolyte, 1M lithium bis(fluorosulfonyl)imide (LiFSI) in N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (Pyr1,3 FSI) to achieve stable cycling performance and improved rate capability. The optimized cathode-electrolyte system exhibits extended cycling performance (>85% capacity retention after 300 cycles) and high rate performance (106.2mAhg–1 at 5C) even at an elevated temperature of 65 ◦C. X-ray photoelectron spectroscopy and spatially resolved x-ray fluorescence analyses confirm the formation of a robust, LiF-rich cathode electrolyte interphase. This study presents a comprehensive design strategy to improve the electrochemical performance of high-voltage cathode materials.</p></div></div></div>

scholarly journals Insights into Ionic Liquid Electrolyte Transport and Structure via Operando Raman Microspectroscopy

2021 ◽  
Author(s):  
Jack Fawdon ◽  
Gregory Rees ◽  
Fabio La Mantia ◽  
Mauro Pasta
Keyword(s):  
Ionic Liquid ◽  
Rate Capability ◽  
Transference Number ◽  
High Viscosity ◽  
Liquid Electrolyte ◽  
Raman Microspectroscopy ◽  
Concentration Gradients ◽  
Ionic Liquid Electrolyte ◽  
Apparent Diffusion ◽  
First Time

Ionic liquid electrolytes (ILEs) have become popular in various advanced Li-ion battery chemistries because of their high electrochemical and thermal stability, and low volatility. However, due to their relatively high viscosity and poor Li+ diffusion, it is thought large concentration gradients form, reducing their rate capability. Here, we utilised operando Raman microspectroscopy to visualise ILE concentration gradients for the first time. Specifically, using lithium bis(fluorosulfonyl)imide (LiFSI) in N-propyl- N-methylpyrrolidinium FSI, its "apparent" diffusion coefficient, lithium transference number, thermodynamic factor, ionic conductivity and resistance of charge-transfer against lithium metal, were isolated. Furthermore, the analysis of these concentration gradients led to insights into the bulk structure of ILEs, which we propose is composed of large, ordered aggregates.

scholarly journals Improved cyclability of Sn–Cu film electrode for sodium secondary battery using inorganic ionic liquid electrolyte

2014 ◽  
Vol 135 ◽  
pp. 60-67 ◽  
Author(s):  
Takayuki Yamamoto ◽  
Toshiyuki Nohira ◽  
Rika Hagiwara ◽  
Atsushi Fukunaga ◽  
Shoichiro Sakai ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Electrolyte ◽  
Film Electrode ◽  
Ionic Liquid Electrolyte ◽  
Secondary Battery ◽  
Cu Film

scholarly journals Electrochemical reaction and surface chemistry for performance enhancement of a Si composite anode using a bis(fluorosulfonyl)imide-based ionic liquid

2016 ◽  
Vol 4 (39) ◽  
pp. 15117-15125 ◽  
Author(s):  
Hitoshi Shobukawa ◽  
JaeWook Shin ◽  
Judith Alvarado ◽  
Cyrus S. Rustomji ◽  
Ying Shirley Meng
Keyword(s):  
Ionic Liquid ◽  
Surface Chemistry ◽  
Performance Enhancement ◽  
Electrochemical Reaction ◽  
Rate Capability ◽  
Liquid Electrolyte ◽  
Composite Anode ◽  
Decomposition Products ◽  
Ionic Liquid Electrolyte

A Si composite anode with the ionic liquid electrolyte EMIFSI shows superior rate capability. The decomposition products of EMIFSI are significantly different from those of carbonate electrolytes.

scholarly journals Ordered LiNi0.5Mn1.5O4 Cathode in Bis(fluorosulfonyl)imide-Based Ionic Liquid Electrolyte: Importance of the Cathode-Electrolyte Interphase

2020 ◽  
Author(s):  
Hyeon Jeong Lee ◽  
Zachary Brown ◽  
Ying Zhao ◽  
Jack Fawdon ◽  
Weixin Song ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
High Voltage ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Performance ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Energy Density ◽  
X Ray ◽  
Ionic Liquid Electrolyte

<div><div><div><p>The high voltage (4.7 V vs. Li+ /Li) spinel lithium nickel manganese oxide (LiNi0.5 Mn1.5 O4 , LNMO) is a promising candidate for the next-generation of lithium ion batteries due to its high energy density, low cost and environmental impact. However, poor cycling performance at high cutoff potentials limits its commercialization. Herein, hollow structured LNMO is synergistically paired with an ionic liquid electrolyte, 1M lithium bis(fluorosulfonyl)imide (LiFSI) in N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (Pyr1,3 FSI) to achieve stable cycling performance and improved rate capability. The optimized cathode-electrolyte system exhibits extended cycling performance (>85% capacity retention after 300 cycles) and high rate performance (106.2mAhg–1 at 5C) even at an elevated temperature of 65 ◦C. X-ray photoelectron spectroscopy and spatially resolved x-ray fluorescence analyses confirm the formation of a robust, LiF-rich cathode electrolyte interphase. This study presents a comprehensive design strategy to improve the electrochemical performance of high-voltage cathode materials.</p></div></div></div>

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