A silica-based gel electrolyte system for improving the cycle performance of LiFePO4 batteries in an aqueous medium

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 2176-2182 ◽  
Author(s):  
J. L. Pan ◽  
Y. Yin ◽  
Y. H. Wen ◽  
S. L. Bai ◽  
J. Cheng ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Cycling Performance ◽  
Gel Electrolyte ◽  
Cycle Performance ◽  
Electrolyte System ◽  
Gel Electrolytes ◽  
P Cycling

Cycling performance of LiFePO4 electrodes in aqueous and gel electrolytes at a 0.5C rate.

Immittance Studies of DBP Plasticized Salicylic Acid Doped PMMA Based Gel Electrolytes

2006 ◽  
Vol 517 ◽  
pp. 97-100 ◽  
Author(s):  
M.I.N. Isa ◽  
S.R. Majid ◽  
A.K. Arof
Keyword(s):  
Activation Energy ◽  
Salicylic Acid ◽  
Room Temperature ◽  
Ethylene Carbonate ◽  
Gel Electrolyte ◽  
Electrolyte System ◽  
Conductivity Activation Energy ◽  
Gel Electrolytes ◽  
Tan Δ ◽  
Oxygen Site

A gel electrolyte system was prepared by dissolving poly(methyl methacrylate) in ethylene carbonate and propylene carbonate doped with salicylic acid and plasticized with dibutylphthalate (DBP). The gel was heated to 70 0C before it was cast into glass dishes. The composition of the electrolytes was 35 wt% EC, 30 wt% PC, 5 wt% SA, 5wt% DBP and 25 wt% PMMA. The gel electrolyte was sandwiched between two stainless-steel blocking electrodes and impedance measurements were conducted. The conductivity of the gel electrolyte was 2.03 x 10-4 S cm-1 at room temperature. The conductivity activation energy was obtained from the log σ versus 103/T graph. Loss tangent was calculated at every frequency for all temperatures. From the tan δ versus frequency plot, the activation energy of relaxation of the ion was calculated and plotted as ln τ versus 103/T. The conductivity activation energy value was (0.21 ± 0.04) eV and the activation energy of relaxation was (0.24±0.07) eV. The similarity between these activation energies imply that the protons ‘hop’ from one electronegative oxygen site in DBP to another.

Salicylic Acid and Dibuthyl Phatalate (DBP) Interaction in PMMA-Based Gel Electrolytes

2006 ◽  
Vol 517 ◽  
pp. 294-0
Author(s):  
M.I.N. Isa ◽  
A.K. Arof
Keyword(s):  
Salicylic Acid ◽  
Methyl Methacrylate ◽  
Propylene Carbonate ◽  
Dibutyl Phthalate ◽  
Ethylene Carbonate ◽  
Gel Electrolyte ◽  
Electrolyte System ◽  
Poly Methyl Methacrylate ◽  
Gel Electrolytes

A gel electrolyte system was prepared by dissolving poly(methyl methacrylate) (PMMA) in ethylene carbonate (EC) and propylene carbonate (PC) doped with salicylic acid (SA) and plasticized with dibutyl phthalate (DBP). The composition of the electrolyte was 35 wt% EC-30 wt% PC-5 wt% SA-5wt% DBP-25 wt% PMMA. The presence of a hump at ~760 cm-1 and a shoulder at 1155 cm-1 in the spectrum of SA-DBP indicate the protonation of DBP. The effect of these bands can also be observed in the spectrum of the gel. Hence, SA has dissociated producing H+ which then interacts datively at the oxygen sites of DBP.

Effect of Different Filler Groups on Ionic Behavior of PVdF Gel Electrolyte System

2014 ◽  
Vol 1 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Mrigank Dwivedi ◽  
◽  
Nidhi Asthana ◽  
Kamlesh Pandey
Keyword(s):  
Gel Electrolyte ◽  
Electrolyte System

Gel Electrolyte Based Supercapacitors with Higher Capacitances and Lower Resistances than Devices with a Liquid Electrolyte

MRS Advances ◽  
2018 ◽  
Vol 3 (22) ◽  
pp. 1261-1267 ◽  
Author(s):  
Belqasem Aljafari ◽  
Arash Takshi
Keyword(s):  
Polymer Electrolytes ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
Liquid Electrolyte ◽  
Gel Electrolyte ◽  
Superior Performance ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Gel Electrolytes ◽  
Further Development

ABSTRACTRecently, gel polymer electrolytes (GPEs) have been drawn noteworthy attention for different applications, specifically, for supercapacitors. GPEs could become an excellent substitute to liquid electrolytes (LEs) for making flexible and more durable devices. The performance of two different electrolytes (GPEs and LEs) in multi-wall carbon nanotube based supercapacitors were investigated. In spite of significantly lower conductivity of GPEs than LEs, devices with the gel electrolyte presented a superior performance. More focused has been given in this work on demonstrating the performance of supercapacitors based on GPEs and LEs at different concentrations of the acids ranging from 1M to 3M. Both electrolytes have been characterized at room temperature by making supercapacitors and using cyclic voltammetry, charging-discharging, electrochemical impedance spectroscopy, and leakage tests. The experimental results showed that GPE devices had much better capacitances and resistances compare to the LE based devices. Moreover, the capacitances of all devices were increased proportionally with the increase in the concentration from 1M to 3M, and the resistances were increased inversely with the decreased of concentration. The promising results from the gel electrolytes is encouraging for further development of flexible and high capacitance energy storage devices.

Lithium Storage Property of Metallic Silicon Treated by Mechanical Alloying

2016 ◽  
Vol 847 ◽  
pp. 29-32
Author(s):  
Qiang Wei Fu ◽  
Xun Yong Jiang
Keyword(s):  
Mechanical Alloying ◽  
Volume Change ◽  
Cycling Performance ◽  
Volume Effect ◽  
Cycle Performance ◽  
Particle Sizes ◽  
Lithium Insertion ◽  
Lithium Storage ◽  
Pure Silicon ◽  
Storage Property

Theoretical capacity of silicon is 4200mAhg-1, but pure silicon had huge volume change during lithium insertion, which reduces the cycle life of silicon. In this paper, pure silicon was replaced of metallic silicon to relieve volume effect. Metallic silicon contains some alloying elements which improve the conductivity of the electrode material. The elements in metallic silicon will relief the volume change of silicon substrate during lithium insertion/ de-lithiation process. Metallic silicon was treated by mechanical alloying (MA) which is an effective method to reduce particle sizes of metallic silicon. The results show that MA can improve cycle performance of metallic silicon. Metallic silicon treated by MA performs a better cycling performance compared with the unsettled materials and a higher discharge capacity in the first cycle.

Electrochemical Performance Cr Doped Spinel LiMn2O4 Cathode for Lithium Ion Batteries

2014 ◽  
Vol 636 ◽  
pp. 49-53
Author(s):  
Si Qi Wen ◽  
Liang Chao Gao ◽  
Jia Li Wang ◽  
Lei Zhang ◽  
Zhi Cheng Yang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Cycle Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Discharge Test

To improve the cycle performance of spinel LiMn2O4as the cathode of 4 V class lithium ion batteries, spinel were successfully prepared using the sol-gel method. The dependence of the physicochemical properties of the spinel LiCrxMn2-xO4(x=0,0.05,0.1,0.2,0.3,0.4) powders powder has been extensively investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), charge-discharge test and electrochemical impedance spectroscopy (EIS). The results show that as Mn is replaced by Cr, the initial capacity decreases, but the cycling performance improves due to stabilization of spinel structure. Of all, the LiCr0.2Mn1.8O4has best electrochemical performance, 107.6 mAhg-1discharge capacity, 96.1% of the retention after 50 cycles.

scholarly journals Nanofluidic voidless electrode for electrochemical capacitance enhancement in gel electrolyte

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kefeng Xiao ◽  
Taimin Yang ◽  
Jiaxing Liang ◽  
Aditya Rawal ◽  
Huabo Liu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Porous Electrodes ◽  
Gel Electrolyte ◽  
Ion Diffusion ◽  
Electrochemical Capacitance ◽  
Diffusion Limitations ◽  
Gel Electrolytes ◽  
Liquid Electrolytes ◽  
Storage Technologies ◽  
Lower Capacitance

AbstractPorous electrodes with extraordinary capacitances in liquid electrolytes are oftentimes incompetent when gel electrolyte is applied because of the escalating ion diffusion limitations brought by the difficulties of infilling the pores of electrode with gels. As a result, porous electrodes usually exhibit lower capacitance in gel electrolytes than that in liquid electrolytes. Benefiting from the swift ion transport in intrinsic hydrated nanochannels, the electrochemical capacitance of the nanofluidic voidless electrode (5.56% porosity) is nearly equal in gel and liquid electrolytes with a difference of ~1.8%. In gel electrolyte, the areal capacitance reaches 8.94 F cm−2 with a gravimetric capacitance of 178.8 F g−1 and a volumetric capacitance of 321.8 F cm−3. The findings are valuable to solid-state electrochemical energy storage technologies that require high-efficiency charge transport.

High-capacity and long-life lithium storage boosted by pseudocapacitance in three-dimensional MnO–Cu–CNT/graphene anodes

Nanoscale ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 2944-2954 ◽  
Author(s):  
Junyong Wang ◽  
Qinglin Deng ◽  
Mengjiao Li ◽  
Kai Jiang ◽  
Zhigao Hu ◽  
...  
Keyword(s):  
Morphological Change ◽  
Three Dimensional ◽  
High Capacity ◽  
Cycling Performance ◽  
Lithium Storage ◽  
P Cycling ◽  
Long Life

Cycling performance and morphological change of a MnO–Cu–CG electrode at 5 A g−1 for 3500 cycles.

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