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 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 Improving Cycle Life Through Fast Formation Using a Super-Concentrated Phosphonium Based Ionic Liquid Electrolyte for Anode-Free and Lithium Metal Batteries

2021 ◽  
Author(s):  
Thushan Pathirana ◽  
Dmitrii Rakov ◽  
Fangfang Chen ◽  
Maria Forsyth ◽  
Robert Kerr ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Energy Density ◽  
Electrochemical Impedance ◽  
Cell Formation ◽  
Lithium Ion ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Energy Density ◽  
Lithium Metal ◽  
Ionic Liquid Electrolyte

<p>ABSTRACT </p><p>Cell formation of lithium-ion cells impacts the evolution of the solid electrolyte interphase (SEI) and the cell cycle stability. Lithium metal anodes are an important step in the development of high energy density batteries owing to the high theoretical specific capacity of lithium metal. However, most lithium metal battery research has used a conventional lithium-ion formation protocol; this is time consuming, costly and does not account for the different properties of the lithium metal electrode. Here, we have used a recently reported promising phosphonium bis(fluorosulfonyl)imide ionic liquid electrolyte coupled with an NMC622 high areal capacity cathode (>3.5 mAh/cm2) to investigate the effect of cell formation rates. A faster formation protocol comprised of a pulsed 1.25C current decreased the formation time by 56 % and gave a 38 % greater capacity retention after 50 cycles when compared to formation at C/20. Electrochemical impedance spectroscopy measurements showed that the fast formation gave rise to a lower-resistance SEI. Column-like lithium deposits with reduced porous lithium domains between the particles were observed using scanning electron microscope imaging. To underline the excellent performance of these high energy-density cells, a 56 % greater stack specific energy was achieved compared to the analogous graphite-based lithium-ion cell chemistries. </p>

scholarly journals Improving Cycle Life Through Fast Formation Using a Super-Concentrated Phosphonium Based Ionic Liquid Electrolyte for Anode-Free and Lithium Metal Batteries

2021 ◽  
Author(s):  
Thushan Pathirana ◽  
Dmitrii Rakov ◽  
Fangfang Chen ◽  
Maria Forsyth ◽  
Robert Kerr ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Energy Density ◽  
Electrochemical Impedance ◽  
Cell Formation ◽  
Lithium Ion ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Energy Density ◽  
Lithium Metal ◽  
Ionic Liquid Electrolyte

<p>ABSTRACT </p><p>Cell formation of lithium-ion cells impacts the evolution of the solid electrolyte interphase (SEI) and the cell cycle stability. Lithium metal anodes are an important step in the development of high energy density batteries owing to the high theoretical specific capacity of lithium metal. However, most lithium metal battery research has used a conventional lithium-ion formation protocol; this is time consuming, costly and does not account for the different properties of the lithium metal electrode. Here, we have used a recently reported promising phosphonium bis(fluorosulfonyl)imide ionic liquid electrolyte coupled with an NMC622 high areal capacity cathode (>3.5 mAh/cm2) to investigate the effect of cell formation rates. A faster formation protocol comprised of a pulsed 1.25C current decreased the formation time by 56 % and gave a 38 % greater capacity retention after 50 cycles when compared to formation at C/20. Electrochemical impedance spectroscopy measurements showed that the fast formation gave rise to a lower-resistance SEI. Column-like lithium deposits with reduced porous lithium domains between the particles were observed using scanning electron microscope imaging. To underline the excellent performance of these high energy-density cells, a 56 % greater stack specific energy was achieved compared to the analogous graphite-based lithium-ion cell chemistries. </p>

High energy density supercapacitor based on N/B co-doped graphene nanoarchitectures and ionic liquid electrolyte

Ionics ◽  
2019 ◽  
Vol 25 (9) ◽  
pp. 4351-4360 ◽  
Author(s):  
Zhongliang Yu ◽  
Jiahe Zhang ◽  
Chunxian Xing ◽  
Lei Hu ◽  
Lili Wang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Energy Density ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Energy Density ◽  
Ionic Liquid Electrolyte ◽  
Doped Graphene ◽  
Co Doped

A novel boron-based ionic liquid electrolyte for high voltage lithium-ion batteries with outstanding cycling stability

2018 ◽  
Vol 283 ◽  
pp. 111-120 ◽  
Author(s):  
Fuxiao Liang ◽  
Jiali Yu ◽  
Jiahui Chen ◽  
Dong Wang ◽  
Chengdong Lin ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Lithium Ion Batteries ◽  
High Voltage ◽  
Lithium Ion ◽  
Liquid Electrolyte ◽  
Cycling Stability ◽  
Ionic Liquid Electrolyte

scholarly journals Redox-active ionic liquid electrolyte with multi energy storage mechanism for high energy density supercapacitor

RSC Advances ◽  
2017 ◽  
Vol 7 (88) ◽  
pp. 55702-55708 ◽  
Author(s):  
Duck-Jae You ◽  
Zhenxing Yin ◽  
Yong-keon Ahn ◽  
Seong-Hun Lee ◽  
Jeeyoung Yoo ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Energy Density ◽  
Size Variation ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Energy Density ◽  
Halide Ions ◽  
Ionic Liquid Electrolyte ◽  
Storage Mechanism ◽  
Redox Active

A bimodal redox-active ionic liquid electrolyte for high energy density supercapacitors was fabricated by the redox reaction of halide ions and size variation of ions.

High-Li+-fraction ether-side-chain pyrrolidinium–asymmetric imide ionic liquid electrolyte for high-energy-density Si//Ni-rich layered oxide Li-ion batteries

2021 ◽  
pp. 132693
Author(s):  
Bharath Umesh ◽  
Purna Chandra Rath ◽  
Jagabandhu Patra ◽  
Rahmandhika Firdauzha Hary Hernandha ◽  
Subhasis Basu Majumder ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Energy Density ◽  
High Energy ◽  
Liquid Electrolyte ◽  
High Energy Density ◽  
Side Chain ◽  
Li Ion Batteries ◽  
Layered Oxide ◽  
Ionic Liquid Electrolyte ◽  
Li Ion

Composition manipulation of bis(fluorosulfonyl)imide-based ionic liquid electrolyte for high-voltage graphite//LiNi0.5Mn1.5O4 lithium-ion batteries

2021 ◽  
Vol 415 ◽  
pp. 128904
Author(s):  
Purna Chandra Rath ◽  
Yi-Wun Wang ◽  
Jagabandhu Patra ◽  
Bharath Umesh ◽  
Ting-Ju Yeh ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Lithium Ion Batteries ◽  
High Voltage ◽  
Lithium Ion ◽  
Liquid Electrolyte ◽  
Ionic Liquid Electrolyte

scholarly journals Paving the Way Toward Highly Efficient High-Energy Potassium-Ion Batteries with Ionic-Liquid Electrolytes

2020 ◽  
Author(s):  
Michele Fiore ◽  
Kevin Hurlbutt ◽  
Samuel Wheeler ◽  
Isaac Capone ◽  
Jack Fawdon ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
High Energy ◽  
Liquid Electrolyte ◽  
Potassium Ion ◽  
Graphite Anode ◽  
Ionic Liquid Electrolyte ◽  
Prussian Blue Analog ◽  
Operating Potential

<div><div><div><p>Potassium-ion batteries (KIB) are a promising complementary technology to lithium-ion batteries because of the comparative abundance and affordability of potassium. Currently, the most promising KIB chemistry consists of a potassium manganese hexacyanoferrate (KMF) cathode, a Prussian blue analog, and a graphite anode (723Whl−1 and 359Whkg−1 at 3.6V). No electrolyte has yet been formulated that is concurrently stable at the high operating potential of KMF (4.02V vs K+/K) and compatible with K+ intercalation into graphite, currently the most critical hurdle to adoption. Here we combine a KMF cathode and a graphite anode with a KFSI in Pyr1,3FSI ionic liquid electrolyte for the first time and show unprecedented performance. We use high-throughput techniques to optimize the KMF morphology for operation in this electrolyte system, achieving 119 mA h g−1 at 4 V vs K+/K and a coulombic efficiency >99.3%. In the same ionic liquid electrolyte graphite shows excellent electrochemical performance and we demonstrate reversible cycling by operando XRD. These results are a significant and essential step forward towards viable potassium-ion batteries.</p></div></div></div>

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