Article
Chemistry, Physical
Yusuke Shimoda, Yukiko Matsui, Takeshi Tonoya, Masashi Ishikawa
Summary: Lithium-sulfur (Li-S) batteries are promising for high energy density applications, but the dissolution of Li polysulfides in the electrolyte hinders their practical use. The addition of a highly concentrated sulfolane-based electrolyte can solve this problem, but it decreases the reversibility of the Li-metal anode. By adding potassium FSI (KFSI) as an electrolyte additive, a stable solid electrolyte interface (SEI) can be formed at the Li anode, significantly improving the Coulombic efficiency and cycle stability of Li-S batteries. These results demonstrate the effectiveness of KFSI in protecting Li-metal anodes and enhancing the performance of Li-S batteries.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Gaoxue Jiang, Jiandong Liu, Zhongsheng Wang, Jianmin Ma
Summary: A high-performance non-flammable electrolyte is designed by using 1.5 m LiTFSI in propylene carbonate (PC)/triethyl phosphate (TEP) (4:1 by vol.) with 4-nitrophenyl trifluoroacetate (TFANP) as the additive. This electrolyte can facilitate the formation of LiF-rich solid electrolyte interphase (SEI) on the Li anode surface and cathode electrolyte interphase (CEI) on the cathode surface, suppressing the growth of Li dendrites and reducing the continuous electrolyte consumption. The Li||LiNi0.6Co0.2Mn0.2O2 battery with this electrolyte shows excellent cycling stability and rate performance.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Electrochemistry
Yin Quan, Shiyou Li, Ningshuang Zhang, Xiaoling Cui, Dongni Zhao, Yulong Zhang, Mengya Wang, Xiaohua Li
Summary: The low concentration electrolyte with the addition of LiFSI and potentiostatic reduction pre-treatment at a low potential shows improved electrochemical performance. The reduction of LiFSI facilitates the formation of a LiF-rich cathode-electrolyte interphase (CEI) on the cathode surface, enhancing the cycle stability of the cathode. Compared to traditional electrolyte engineering strategies, this method requires lower reaction energy and potential. It provides an effective way to improve the performance of low concentration electrolytes by constructing a LiF-rich CEI.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Environmental
Purna Chandra Rath, Yi-Wun Wang, Jagabandhu Patra, Bharath Umesh, Ting-Ju Yeh, Shigeto Okada, Ju Li, Jeng-Kuei Chang
Summary: This study explores strategies to overcome the limitation of FSI- corrosion towards the Al current collector, achieving optimal charge-discharge of a high-voltage LNMO cathode with an Al substrate. The effects of IL composition on the electrochemical properties of a graphite anode are also investigated. The proposed IL electrolyte, without organic solvents, effectively suppresses Al corrosion and enables a 5-V graphite//LNMO full cell.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Mengchuang Liu, Ziqi Zeng, Wei Zhong, Zicheng Ge, Longqing Li, Sheng Lei, Qiang Wu, Han Zhang, Shijie Cheng, Jia Xie
Summary: In this study, a non-flammable electrolyte with internal-external flame retardants is designed by introducing fluorobenzene as a cosolvent and bridge solvent in a high-concentration electrolyte system. This design successfully solves the safety concerns of lithium-ion batteries and achieves stable cycling.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Jiaming Zhang, Qiuping Li, Yaping Zeng, Zheng Tang, Dan Sun, Dan Huang, Zhiguang Peng, Yougen Tang, Haiyan Wang
Summary: This study proposes a brand-new ultralow concentration mixed ether electrolyte for lithium metal batteries, which improves Coulombic efficiency and safety. The unique solvent structure design leads to over 99.3% lithium deposition/stripping efficiency and superior electrochemical performance.
ENERGY STORAGE MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Shanika Abeysooriya, Minjae Lee, Seung Hwan Kim, Luke A. A. O'Dell, Jennifer M. M. Pringle
Summary: In this study, the synthesis and characterization of three dicationic-FSI salts were reported for the first time. The analysis showed that [C-2-Pyrr1][FSI](2) with shorter alkyl-side chains exhibited higher transport properties compared to [C-2-Pyrr2][FSI](2) and [C-2-Pyrr3][FSI](2). Furthermore, when mixed with LiFSI, [C-2-Pyrr1][FSI](2)/10% LiFSI demonstrated improved transport properties and [C-2-Pyrr1][FSI](2)/50% LiFSI showed the highest Li+ self-diffusion ratio among the four Li-salt-containing mixtures.
Article
Engineering, Environmental
Xianjun Weng, Yanyang Qin, Xinyu Da, Yuanjun Zhao, Xuetian Deng, Bo Wen, Manying Cui, Xiangkai Yin, Yaqiong Su, Jiangxuan Song, Shujiang Ding, Xiaofei Hu, Guoxin Gao, Xuefei Li
Summary: A novel bifunctional electrolyte additive, NFSI, was developed to greatly improve the cyclability and safety of lithium metal batteries. NFSI preferentially reacts with the lithium anode to form a stable solid electrolyte interphase (SEI) film, inhibiting electrolyte consumption and lithium dendrite growth. Additionally, NFSI is preferentially oxidized to form a conductive thin film layer. Li||Li cells containing 0.1 M NFSI exhibit excellent cycle stability and Li||Cu cells show high Coulombic efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Maria Martinez-Ibanez, Nicola Boaretto, Alexander Santiago, Leire Meabe, Xiaoen Wang, Oihane Zugazua, Inigo Raposo, Maria Forsyth, Michel Armand, Heng Zhang
Summary: This paper reports a highly-concentrated FSI-based ternary gel polymer electrolyte (TGPE) with high lithium-ion conductivities, wide electrochemical stability, and superior compatibility with lithium metal electrode. The TGPE enables stable Li plating and stripping processes, as well as high discharge capacity of a Li||Li(Ni0.6Mn0.2Co0.2)O2 cell at ambient temperatures. This study not only provides safe and highly conductive polymer electrolytes but also enhances our understanding of the role of FSI anions in high-energy lithium metal batteries.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Subin Lee, Ye Jin Jeon, Kicheol Kim, Jeong Ae Yoon, Taeeun Yim
Summary: By designing dually functionalized electrolyte additives and forming an inorganic-organic combined solid electrolyte interphase (SEI) layer on the Li metal surface, electrolyte decomposition and dendritic Li formation are suppressed, leading to stable cycling of Li metal cells.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Kiho Nishioka, Morihiro Saito, Manai Ono, Shoichi Matsuda, Shuji Nakanishi
Summary: This study evaluated the potential of a electrolyte solvent, DMESA, for secondary lithium-oxygen batteries. It was found that DMESA electrolyte led to the formation of highly degradable lithium peroxide, which reduced the charging voltage and suppressed the electrolyte decomposition.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Songyan Bai, Byunghoon Kim, Chungryeol Kim, Orapa Tamwattana, Hyeokjun Park, Jihyeon Kim, Dongwhan Lee, Kisuk Kang
Summary: The use of MOF gel separators in organic batteries can effectively address electrode dissolution and shuttle effect issues, improving cycle stability and capacity retention. This technology has great potential for various applications, as the pore size can be tailored to specific organic electrode materials.
NATURE NANOTECHNOLOGY
(2021)
Article
Energy & Fuels
Zhixiang Chen, Hao Shen, Yucheng Zhu, Min Hua, Xuhai Pan, Yahong Liu, Hao Ji, Makhmud Bolliev, Juncheng Jiang
Summary: With the rapid development of new energy vehicles, the safety of lithium-ion batteries (LIBs) is a growing concern. A new electrolyte system was configured in this study using commercial carbonate-based organic solvents mixed with [BMP]TFSI pyrrole-type ionic liquids in different proportions. The newly configured electrolyte system significantly reduced the flammability of the battery and improved its electrochemical performance.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Multidisciplinary
Charl J. Jafta, Xiao-Guang Sun, Hailong Lyu, Hao Chen, Bishnu P. Thapaliya, William T. Heller, Matthew J. Cuneo, Richard T. Mayes, Mariappan Parans Paranthaman, Sheng Dai, Craig A. Bridges
Summary: The formation of the solid electrolyte interphase (SEI) in an ionic liquid electrolyte of 0.5 M lithium bis(fluorosulfonyl)imide (LiFSI) in 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide at high cell voltages (1.7-1.9 V) was investigated in ordered mesoporous carbon (OMC) based Li metal cells using an operando small-angle neutron scattering (SANS) technique coupled with electrochemical impedance spectroscopy and ex situ X-ray photoelectron spectroscopy (XPS). It was demonstrated that discharging the OMC Li metal cells to approximately 2 V and holding the cell voltage constant induces a rapid current increase with time, confirming extensive reduction and SEI formation. XPS analysis revealed that LiF is formed at open cell voltage (OCV), attributed to the carbenes generated at the lithium negative electrode reacting with EMIm cation diffusing to and initiating the reaction with FSI- anions at the carbon positive electrode. It was confirmed that the chemical reaction at OCV and electrochemical reduction at high cell voltage of the FSI- anion plays a protective role against EMIm cation co-intercalation into the carbon positive electrode during the initial discharge. Operando SANS studies also suggest that slight differences occur in the surface composition and reaction mechanism as a function of cell voltage.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Dong Ding, Yuta Maeyoshi, Masaaki Kubota, Jungo Wakasugi, Kiyoshi Kanamura, Hidetoshi Abe
Summary: The study introduces a super-concentrated polymer in solvated ionic liquid that enhances the ionic conductivity of PEO-based polymer electrolytes, demonstrating promising electrochemical performance in polymer lithium-ion batteries.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Hao Wu, Ziyu Song, Xingxing VVang, Wenfang Feng, Zhibin Zho, Heng Zhan
Summary: Effective passivation of aluminum current collector at high potentials is crucial for the long-term operation of lithium-based batteries. However, the non-aqueous liquid electrolytes used in these batteries are corrosive towards aluminum, despite their other desirable features. This study proposes the use of DMFSA as an electrolyte solvent to suppress aluminum corrosion, and demonstrates that it leads to significantly reduced corrosion and improved stability of the current collector.