scholarly journals Investigating on physical and electrochemical properties of high concentrated electrolytes based on LiBF4 salt for 5 V Li-ion rechargeable batteries

2021 ◽  
Vol 63 (11) ◽  
pp. 12-16
Author(s):  
Kim Ngan Pham ◽  
◽  
Minh Kha Le ◽  
Thi Thanh Tuyen Truong ◽  
Thi Kim Tuyen Huynh ◽  
...  
Keyword(s):  
High Voltage ◽  
Coulombic Efficiency ◽  
Oxidation Stability ◽  
Rechargeable Batteries ◽  
Li Ion Batteries ◽  
Trimethyl Phosphate ◽  
Voltage Range ◽  
Concentrated Electrolytes ◽  
Li Ion ◽  
Initial Coulombic Efficiency

In this work, highly concentrated electrolytes were prepared by dissolving tetrafluoroborate (LiBF4) salt in the two solvents including tetramethylene sulfone (TMS) and trimethyl phosphate (TMP) with different mole ratios. The results indicated that the electrolyte LiBF4/TMS (1:3) (~3.4 M) possessed the highest oxidation stability of 6.2 V (vs. Li+/Li) and high ionic conductivity of 1.0 mS/cm that could be promising for high voltage Li-ion batteries operated in the voltage range of 3.5-4.9 V. The electrolyte compatibility with high voltage cathode Li || LiNi0.5Mn1.5O4 (LNMO) was evaluated in coin-cell configuration, which displayed high reversible discharge capacity of 113 mAh/g in the first cycle and high initial Coulombic efficiency >91% and remained >80% of the initial capacity at the 100th cycle. By using the cyclic voltammetry (CV) method, the diffusion coefficient was also calculated as about 4.51×10-11 cm2/s.

Improved electrochemical performance of LiCoO2 electrodes for high-voltage operations by Ag thin film coating via magnetron sputtering

MRS Advances ◽  
2018 ◽  
Vol 3 (60) ◽  
pp. 3513-3518 ◽  
Author(s):  
Taner Zerrin ◽  
Mihri Ozkan ◽  
Cengiz S. Ozkan
Keyword(s):  
Thin Film ◽  
Magnetron Sputtering ◽  
Electrochemical Performance ◽  
High Voltage ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Interface Layer ◽  
Li Ion Batteries ◽  
Electrode Structure ◽  
Li Ion

ABSTRACTIncreasing the operation voltage of LiCoO2 (LCO) is a direct way to enhance the energy density of the Li-ion batteries. However, at high voltages, the cycling stability degrades very fast due to the irreversible changes in the electrode structure, and formation of an unstable solid electrolyte interface layer. In this work, Ag thin film was prepared on commercial LCO cathode by using magnetron sputtering technique. Ag coated electrode enabled an improved electrochemical performance with a better cycling capability. After 100 cycles, Ag coated LCO delivers a discharge capacity of 106.3 mAh g-1 within 3 - 4.5 V at C/5, which is increased by 45 % compared to that of the uncoated LCO. Coating the electrode surface with Ag thin film also delivered an improved Coulombic efficiency, which is believed to be an indication of suppressed parasitic reactions at the electrode interface. This work may lead to new methods on surface modifications of LCO and other cathode materials to achieve high-capacity Li-ion batteries for high-voltage operations.

Reactivating Li 2 O with Nano‐Sn to Achieve Ultrahigh Initial Coulombic Efficiency SiO Anodes for Li‐Ion Batteries

ChemSusChem ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 3377-3382 ◽  
Author(s):  
Rusheng Fu ◽  
Yongkang Wu ◽  
Chongzhao Fan ◽  
Zuxin Long ◽  
Guangjie Shao ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Initial Coulombic Efficiency

Electrochemical Performance of SiO/C Composites as Anode Material for Li-Ion Batteries

2015 ◽  
Vol 1092-1093 ◽  
pp. 185-190 ◽  
Author(s):  
Jing Wang ◽  
Mei Juan Zhou ◽  
Feng Wu ◽  
Shi Chen
Keyword(s):  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Weight Ratio ◽  
Heat Treating ◽  
Li Ion Batteries ◽  
X Ray Diffraction ◽  
Galvanostatic Discharge ◽  
Improved Stability ◽  
Li Ion ◽  
Initial Coulombic Efficiency

Dopamine was used as the carbon precursor to prepare SiO/C composite. Dopamine achieved self-polymerization and covered on the surface of the SiO particles in Tris-buffer, and the SiO/C composites were gained after heat-treating in the tube furnace under Argon. X-ray diffraction ( XRD ) , scanning electron microscope ( SEM ) were used to determine the phases obtained and to observe the morphologies of the composite. The galvanostatic discharge/charge test was carried out to characterize the electrochemical properties of the composite. When the sample of the mixed SiO and dopamine at a weight ratio of 1 : 3, the composite showed the best cycle ability with the discharge capacity of 1362 mAh g−1 in the first cycle, and the initial coulombic efficiency is 55.6%, after 50 cycles, the discharge capacity is 442 mAh g−1. The improved stability of the composite is attributed to carbon-coating forming during heat-treatment process.

Nano/Micro-Structured Si/C Anodes with High Initial Coulombic Efficiency in Li-Ion Batteries

2016 ◽  
Vol 11 (8) ◽  
pp. 1205-1209 ◽  
Author(s):  
Quan Xu ◽  
Jin-Yi Li ◽  
Ya-Xia Yin ◽  
Yi-Ming Kong ◽  
Yu-Guo Guo ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Initial Coulombic Efficiency

Si nanoparticle clusters in hollow carbon capsules (SNC@C) as lithium battery anodes: toward high initial coulombic efficiency

Nanoscale ◽  
2019 ◽  
Vol 11 (28) ◽  
pp. 13650-13658 ◽  
Author(s):  
Tae Jin Kim ◽  
Jeong Hoon Yoon ◽  
Gi-Ra Yi ◽  
Pil J. Yoo
Keyword(s):  
High Performance ◽  
Lithium Battery ◽  
Coulombic Efficiency ◽  
Polymerization Process ◽  
Li Ion Batteries ◽  
Si Nanoparticle ◽  
Nanoparticle Clusters ◽  
Li Ion ◽  
Hollow Carbon ◽  
Initial Coulombic Efficiency

Clustered Si@C core–shell-structured particles are synthesized using an organic/inorganic emulsion polymerization process and utilized as a high performance anode material for Li-ion batteries with highly improved initial Coulombic efficiency.

Self-sacrificial organic lithium salt enhanced initial Coulombic efficiency for safer and greener lithium-ion batteries

2019 ◽  
Vol 55 (72) ◽  
pp. 10737-10739 ◽  
Author(s):  
Dapeng Wang ◽  
Zhian Zhang ◽  
Bo Hong ◽  
Yanqing Lai
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Salt ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Cathode Additive ◽  
Initial Coulombic Efficiency

Li2DHBA is proposed as a cathode additive that leaves no residue to compensate for first cycle Li loss in Li-ion batteries.

High-coulombic-efficiency Si-based hybrid microspheres synthesized by the combination of graphene and IL-derived carbon

2015 ◽  
Vol 3 (42) ◽  
pp. 20935-20943 ◽  
Author(s):  
Sang-Hoon Park ◽  
Dongjoon Ahn ◽  
Young-Min Choi ◽  
Kwang Chul Roh ◽  
Kwang-Bum Kim
Keyword(s):  
Energy Efficiency ◽  
Coulombic Efficiency ◽  
Li Ion Batteries ◽  
Irreversible Capacity ◽  
Full Cell ◽  
Capacity Loss ◽  
Cell Capacity ◽  
Li Ion ◽  
Initial Coulombic Efficiency ◽  
High Coulombic Efficiency

The low initial coulombic efficiency of a Si-based anode can hinder the performance of practical full-cell Li-ion batteries (LIBs), as the irreversible capacity loss of the anode can diminish the reversible full-cell capacity and the energy efficiency.

Higher Than 90% Initial Coulombic Efficiency with Staghorn‐Coral‐Like 3D Porous LiFeO 2− x as Anode Materials for Li‐Ion Batteries

2020 ◽  
Vol 32 (22) ◽  
pp. 1908285 ◽  
Author(s):  
Yaxiong Yang ◽  
Xiaolei Qu ◽  
Xin Zhang ◽  
Yongfeng Liu ◽  
Jianjiang Hu ◽  
...  
Keyword(s):  
Anode Materials ◽  
Coulombic Efficiency ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Initial Coulombic Efficiency
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