The ultralong cycle life of solid flexible asymmetric supercapacitors based on nickel vanadium sulfide nanospheres

CrystEngComm ◽  
2020 ◽  
Vol 22 (31) ◽  
pp. 5226-5236
Author(s):  
Yuanyuan Li ◽  
Xin Chen ◽  
Yali Cao ◽  
Wanyong Zhou ◽  
Hui Chai
Keyword(s):  
Current Density ◽  
Cycle Life ◽  
Cyclic Stability ◽  
Asymmetric Supercapacitors ◽  
Vanadium Sulfide ◽  
Charge Discharge

The nickel vanadium sulfide electrodes shows an capacitance of 697.4 C g−1 at current density of 1A g−1. The flexible ACS Ni–V–S–2//rGO gives rise to a remarkable cyclic stability with 100% capacitance retention over 7000 charge–discharge cycles.

Layer-by-Layer Structure Design of G@SiOx@PPY Materials as Promising High-Performance Anodes for Lithium-Ion Batteries

NANO ◽  
2021 ◽  
pp. 2150120
Author(s):  
Jiaying Zhang ◽  
Ting Li ◽  
Chao Li ◽  
Jingjing Zhang ◽  
Chun Ju Lv ◽  
...  
Keyword(s):  
Current Density ◽  
Layer Structure ◽  
Synergetic Effect ◽  
Lithium Ion ◽  
Structure Design ◽  
Molar Ratio ◽  
Electrochemical Performances ◽  
Cyclic Stability ◽  
Discharge Cycle ◽  
Charge Discharge

The graphene/silicon oxide/polypyrrole (G/SiOx/PPY) material was prepared in this paper. The G/SiOx/PPY material has good electrochemical performances including high capacity and cyclic stability. It has 2068/2130[Formula: see text]mAh g[Formula: see text] of capacity after 100th charge/discharge cycle at 200[Formula: see text]mA[Formula: see text]g[Formula: see text] of current density and 575/569[Formula: see text]mAh[Formula: see text]g[Formula: see text] of capacity after 100th charge/discharge cycle at 2000[Formula: see text]mA g[Formula: see text] of current density when G/SiOx molar ratio is 1:5. Its capacity increases but its cyclic stability decreases with G/SiOx molar ratio decreasing from 1:1 to 1:3 and 1:5. The electrochemical performance improvement of the G/SiOx/PPY material is due to the synergetic effect of graphene and polypyrrole, which improve the conductivity of SiOx and prevent its dropping from the surface of the electrode caused by the stress due to the volume expansion and shrinkage in charge/discharge cycles.

scholarly journals Electrochemical Features of Symmetric and Asymmetric Supercapacitors Based on Nanostructured Mn-Cuo Electrodes

2018 ◽  
Vol 34 (6) ◽  
pp. 3058-3063 ◽  
Author(s):  
R. Suresh ◽  
K. Tamilarasan ◽  
D. Senthil Vadivu
Keyword(s):  
Current Density ◽  
Material Science ◽  
Electrode Materials ◽  
Aqueous Electrolyte ◽  
Cyclic Stability ◽  
Initial Value ◽  
Asymmetric Supercapacitors ◽  
Supercapacitive Performance ◽  
Subsequent Investigation ◽  
A Current

Progress in material science has unearthed a number of options that offer great advantages for nanostructured electrode materials which enable supercapacitors to operate efficiently. Present work involves fabrication of symmetric and asymmetric type supercapacitor devices utilizing Mn-CuO nanostructures and activated carbon (AC) as electrode materials and subsequent investigation on their supercapacitive performance in 2M KOH aqueous electrolyte. The asymmetric supercapacitor device (Mn-CuO // 2M KOH// AC) demonstrate a specific capacitance of 72 Fg-1 at a current density of 0.5 Ag-1. The cyclic stability test of this device performed at a current density of 10 Ag-1 reveals a capacitance retention of 71% of its initial value over 300 charge-discharge cycles. In addition, this device exhibits an energy density of 7.4 Whkg-1 and a power density of 127 Wkg-1.

High electrochemical performance in asymmetric supercapacitors using MWCNT/nickel sulfide composite and graphene nanoplatelets as electrodes

2014 ◽  
Vol 2 (39) ◽  
pp. 16723-16730 ◽  
Author(s):  
Arvinder Singh ◽  
Alexander J. Roberts ◽  
Robert C. T. Slade ◽  
Amreesh Chandra
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
Nickel Sulfide ◽  
High Specific Capacitance ◽  
Graphene Nanoplatelets ◽  
Cyclic Stability ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors

A high-performance asymmetric supercapacitor was fabricated using MWCNTs/NiS composite and GNPs as electrodes, exhibiting high specific capacitance of ∼181 F g−1 at 1 A g−1 current density and excellent cyclic stability with 92% retention after 1000 cycles at 2 A g−1 current density.

Carbon encapsulated RuO2 nano-dots anchoring on graphene as an electrode for asymmetric supercapacitors with ultralong cycle life in an ionic liquid electrolyte

2016 ◽  
Vol 4 (21) ◽  
pp. 8180-8189 ◽  
Author(s):  
Baoshou Shen ◽  
Xu Zhang ◽  
Ruisheng Guo ◽  
Junwei Lang ◽  
Jiangtao Chen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Electrolyte ◽  
Cycling Stability ◽  
Cycle Life ◽  
Carbon Shell ◽  
Asymmetric Supercapacitors ◽  
Ionic Liquid Electrolyte ◽  
Superior Cycling Stability ◽  
Charge Discharge

With the protection of a carbon shell, an asymmetric SC exhibited superior cycling stability with 98.5% capacitance retention after 100 000 charge/discharge cycles.

scholarly journals Nanoporous Activated Carbon Derived from Rice Husk for High Performance Supercapacitor

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Huaxing Xu ◽  
Biao Gao ◽  
Hao Cao ◽  
Xueyang Chen ◽  
Ling Yu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Capacitance ◽  
Current Density ◽  
Average Pore Size ◽  
Nanoporous Carbon ◽  
Cycle Life ◽  
Potential Candidate ◽  
Average Pore ◽  
Nanoporous Activated Carbon

Nanoporous activated carbon material was produced from the waste rice husks (RHs) by precarbonizing RHs and activating with KOH. The morphology, structure, and specific surface area were investigated. The nanoporous carbon has the average pore size of 2.2 nm and high specific area of 2523.4 m2 g−1. The specific capacitance of the nanoporous carbon is calculated to be 250 F g−1at the current density of 1 A g−1and remains 80% for 198 F g−1at the current density of 20 A g−1. The nanoporous carbon electrode exhibits long-term cycle life and could keep stable capacitance till 10,000 cycles. The consistently high specific capacitance, rate capacity, and long-term cycle life ability makes it a potential candidate as electrode material for supercapacitor.

Hysteresis Abated P2-type NaCoO2 Cathode Reveals Highly Reversible Multiple Phase Transitions for High-Rate Sodium-ion Batteries

2021 ◽  
Author(s):  
VENKATA RAMI REDDY BODDU ◽  
Manikandan Palanisamy ◽  
Lichchhavi Sinha ◽  
Subhash Yadav ◽  
Vilas Pol ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Discharge Rate ◽  
Cycle Life ◽  
Sodium Ion ◽  
High Rate ◽  
Sodium Ion Batteries ◽  
Long Cycle Life ◽  
Multiple Phase ◽  
Ion Intercalation ◽  
Charge Discharge

Despite multiple phase transitions occur during Na+ ion intercalation and deintercalation, enhanced charge-discharge rate, and long cycle life are achieved to hexagonal shaped P2-type NaCoO2 cathode for sodium-ion batteries (SIBs)....

Cyclic Stability of Supercapacitors: Materials, Energy Storage Mechanism, Test Methods, and Device

2021 ◽  
Author(s):  
Qianghong Wu ◽  
Tianqi He ◽  
Yikai Zhang ◽  
Junlei Zhang ◽  
Zhijun Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Power Density ◽  
Test Methods ◽  
Cycle Life ◽  
Cyclic Stability ◽  
The Real ◽  
Storage Mechanism ◽  
Long Cycle ◽  
Long Cycle Life ◽  
Higher Power

Supercapacitors, also known as electrochemical capacitors, have attracted more and more attentions in recent decades due to their advantages of higher power density and long cycle life. For the real...

Microporous/mesoporous cobalt hexacyanoferrate nanocubes for long-cycle life asymmetric supercapacitors

2018 ◽  
Vol 29 (17) ◽  
pp. 14897-14905 ◽  
Author(s):  
Zhaoxia Song ◽  
Wei Liu ◽  
Qing Yuan ◽  
Quan Zhou ◽  
Guichang Liu ◽  
...  
Keyword(s):  
Cycle Life ◽  
Asymmetric Supercapacitors ◽  
Long Cycle ◽  
Long Cycle Life ◽  
Cobalt Hexacyanoferrate

scholarly journals Effect of Prelithiation Process for Hard Carbon Negative Electrode on the Rate and Cycling Behaviors of Lithium-Ion Batteries

Batteries ◽  
2018 ◽  
Vol 4 (4) ◽  
pp. 71 ◽  
Author(s):  
Yusuke Abe ◽  
Tomoaki Saito ◽  
Seiji Kumagai
Keyword(s):  
Lithium Ion Batteries ◽  
Current Density ◽  
High Current Density ◽  
Negative Electrode ◽  
Lithium Ion ◽  
High Current ◽  
Hard Carbon ◽  
Li Ion ◽  
Charge Discharge ◽  
Ion Insertion

Two prelithiation processes (shallow Li-ion insertion, and thrice-repeated deep Li-ion insertion and extraction) were applied to the hard carbon (HC) negative electrode (NE) used in lithium-ion batteries (LIBs). LIB full-cells were assembled using Li(Ni0.5Co0.2Mn0.3)O2 positive electrodes (PEs) and the prelithiated HC NEs. The assembled full-cells were charged and discharged under a low current density, increasing current densities in a stepwise manner, and then constant under a high current density. The prelithiation process of shallow Li-ion insertion resulted in the high Coulombic efficiency (CE) of the full-cell at the initial charge-discharge cycles as well as in a superior rate capability. The prelithiation process of thrice-repeated Li-ion insertion and extraction attained an even higher CE and a high charge-discharge specific capacity under a low current density. However, both prelithiation processes decreased the capacity retention during charge-discharge cycling under a high current density, ascertaining a trade-off relationship between the increased CE and the cycling performance. Further elimination of the irreversible capacity of the HC NE was responsible for the higher utilization of both the PE and NE, attaining higher initial performances, but allowing the larger capacity to fade throughout charge-discharge cycling.

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