Composition controlled nickel cobalt sulfide core–shell structures as high capacity and good rate-capability electrodes for hybrid supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (55) ◽  
pp. 50209-50216 ◽  
Author(s):  
Lei Zhang ◽  
Haitao Zhang ◽  
Long Jin ◽  
Binbin Zhang ◽  
Fangyan Liu ◽  
...  
Keyword(s):  
High Capacity ◽  
Rate Capability ◽  
Shell Structures ◽  
Cobalt Sulfide ◽  
Metal Sulfides ◽  
Core Shell ◽  
Hybrid Supercapacitors ◽  
Nickel Cobalt ◽  
Tuning Element ◽  
Good Rate Capability

Tuning element content is an effective approach for achieving excellent rate-capability and cycling stability in polynary metal sulfides for hybrid supercapacitors.

Hexagonal petal-like cobalt oxide nanowire arrays encapsulated by MOF-derived Co/N-codoped carbon for boosting electrochemical capacitor behaviour

2021 ◽  
Author(s):  
Xiao-Man Cao ◽  
Zhi-Jia Sun ◽  
Zheng-Bo Han
Keyword(s):  
Cobalt Oxide ◽  
Rate Capability ◽  
Electrochemical Capacitor ◽  
Nanowire Arrays ◽  
Core Shell ◽  
Unique Structure ◽  
Good Rate Capability

A novel core–shell hetero-structured electrode (NF@CoO@Co/N–C) is designed and synthesized via a “anchor-etch-calcine” process for boosting electrochemical capacitor behaviour. The unique structure endows NF@CoO@Co/N–C with ultrahigh areal capacitances and good rate capability.

A core–shell structure of cobalt sulfide//G-ink towards high energy density in asymmetric hybrid supercapacitors

2020 ◽  
Vol 4 (9) ◽  
pp. 4848-4858
Author(s):  
Venkata Thulasivarma Chebrolu ◽  
Balamuralitharan Balakrishnan ◽  
Aravindha Raja Selvaraj ◽  
Hee-Je Kim
Keyword(s):  
Energy Density ◽  
Shell Structure ◽  
High Energy ◽  
High Energy Density ◽  
Cobalt Sulfide ◽  
Core Shell ◽  
Hybrid Supercapacitors ◽  
Promising Strategy ◽  
Asymmetric Hybrid ◽  
Core Shell Structure

New atom substitution in transition metals is a promising strategy for improving the performance of supercapacitors (SCs).

Investigation on Carbonsphere@Nickel Cobalt Sulfide Core-shell Nanocomposite for Asymmetric Supercapacitor Application

2019 ◽  
Vol 6 (1-2) ◽  
pp. 1-13
Author(s):  
A. Simon Justin ◽  
P. Vickraman ◽  
B. Joji Reddy
Keyword(s):  
Metal Sulfide ◽  
High Energy ◽  
High Energy Density ◽  
Cobalt Sulfide ◽  
Core Shell ◽  
Carbon Sphere ◽  
Asymmetric Supercapacitor ◽  
Electrochemical Studies ◽  
The Core ◽  
Nickel Cobalt

Abstract The carbon sphere (CS)@nickel cobalt sulfide core-shell nanocomposite at five different mole ratios have been synthesized by a facile low-temperature water-bath method without any thermal treatment. The XRD results on CS, NiCo2S4 and its ternary complexation confirms nanocomposite formation which matches with the cubic structure. The FTIR confirms the complexation of CS and metal-sulfide core-shell. TEM morphology shows CS at NiCo2S4 forming a core-shell which appears as interlinked bunch of grapes. The BET surface analysis observes the high surface area for the core-shell. The XPS studies confirm the elemental presence and valence states of metal composition of the core-shell. Electrochemical studies on the pure NiCo2S4 and CS@NiCo2S4 have shown that CS@NiCo2S4 in 1:1 ratio (scn2) only exhibits higher specific capacitance of 838 F g−1 at 1 A g−1 with capacity retention of 89 % for 5000 cycles than other mole ratios. Using this scn2, asymmetric supercapacitor (ASC) device fabrication has been studied. The electrochemical studies on ASC reveal high energy density of 101 Wh kg−1 with the power density of 6.3 k W kg−1, and having good cycling stability with 92 % of capacitance retention even after 3000 cycles at 20 A g−1.

Nanostructured anode materials for Li-ion batteries

2008 ◽  
Vol 80 (11) ◽  
pp. 2283-2295 ◽  
Author(s):  
Nahong Zhao ◽  
Lijun Fu ◽  
Lichun Yang ◽  
Tao Zhang ◽  
Gaojun Wang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Anode Materials ◽  
High Capacity ◽  
Rate Capability ◽  
Core Shell ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Cycling Behavior

This paper focuses on the latest progress in the preparation of a series of nanostructured anode materials in our laboratory and their electrochemical properties for Li-ion batteries. These anode materials include core-shell structured Si nanocomposites, TiO2 nanocomposites, novel MoO2 anode material, and carbon nanotube (CNT)-coated SnO2 nanowires (NWs). The substantial advantages of these nanostructured anodes provide greatly improved electrochemical performance including high capacity, better cycling behavior, and rate capability.

scholarly journals Electrochemical Performance of FeF3·0.33H2O/MWCNTs Composite Cathode Synthesized by Solvothermal Process

2015 ◽  
Vol 18 (2) ◽  
pp. 103-109 ◽  
Author(s):  
Yanli Zhang ◽  
Li Wang ◽  
Jianjun Li ◽  
Xiangming He ◽  
Lei Wen ◽  
...  
Keyword(s):  
High Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Solvothermal Reaction ◽  
Multi Walled Carbon Nanotubes ◽  
Energy Storage Applications ◽  
Walled Carbon Nanotubes ◽  
Structural Characterizations ◽  
Good Rate Capability

This paper reports a FeF3·0.33H2O/multi-walled carbon nanotubes (MWCNTs) composite for energy storage applications. The composite material is prepared by solvothermal reaction with FeF3·3H2O and MWCNTs as precursors, and FeF3·3H2O was removed of crystalliferous water and converted to FeF3·0.33H2O during solvothermal treatment. Structural characterizations show that FeF3·0.33H2O that crystalline with a diameter of about 30 nm were distributed in the network of MWCNTs. As a cathode material for lithium ion batteries, FeF3·0.33H2O/MWCNTs was superior to pure FeF3·0.33H2O in terms of high capacity (an initial capacity of 181 mAh g-1 in 2.0-4.3 V at 20 mA g-1), good cycleability (50% capacity retension at 50th cycle) and good rate capability (116 mAh g-1 at 100 mA g-1). The enhanced performances were attributed to the conductive MWCNT network which improved the electron transport ability and buffered volume change of the cathode.

Hybrid LiV3O8/carbon encapsulated Li1.2Mn0.54Co0.13Ni0.13O2 with improved electrochemical properties for lithium ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (34) ◽  
pp. 28729-28736 ◽  
Author(s):  
Kailing Sun ◽  
Can Peng ◽  
Zhaohui Li ◽  
Qichang Xiao ◽  
Gangtie Lei ◽  
...  
Keyword(s):  
Composite Material ◽  
Coulombic Efficiency ◽  
Sol Gel ◽  
Rate Capability ◽  
Lithium Ion ◽  
Core Shell ◽  
Potential Range ◽  
Stable Operation ◽  
Initial Coulombic Efficiency ◽  
Good Rate Capability

Core–shell Li1.2Mn0.54Co0.13Ni0.13O2@LiV3O8/C composite material was prepared by sol–gel method. It possessed an initial coulombic efficiency of 94% at 0.1C rate over 2.0–4.8 V potential range, and good rate capability and stable operation voltage.

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