scholarly journals High-power lithium–selenium batteries enabled by atomic cobalt electrocatalyst in hollow carbon cathode

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Hao Tian ◽  
Huajun Tian ◽  
Shijian Wang ◽  
Shuangming Chen ◽  
Fan Zhang ◽  
...  
Keyword(s):  
High Power ◽  
Coulombic Efficiency ◽  
Electronic Conductivity ◽  
Rate Capability ◽  
Utilization Efficiency ◽  
Single Atom ◽  
Shuttle Effect ◽  
High Discharge Capacity ◽  
Single Atoms ◽  
High Electronic Conductivity

Abstract Selenium cathodes have attracted considerable attention due to high electronic conductivity and volumetric capacity comparable to sulphur cathodes. However, practical development of lithium-selenium batteries has been hindered by the low selenium reaction activity with lithium, high volume changes and rapid capacity fading caused by the shuttle effect of polyselenides. Recently, single atom catalysts have attracted extensive interests in electrochemical energy conversion and storage because of unique electronic and structural properties, maximum atom-utilization efficiency, and outstanding catalytic performances. In this work, we developed a facile route to synthesize cobalt single atoms/nitrogen-doped hollow porous carbon (CoSA-HC). The cobalt single atoms can activate selenium reactivity and immobilize selenium and polyselenides. The as-prepared selenium-carbon (Se@CoSA-HC) cathodes deliver a high discharge capacity, a superior rate capability, and excellent cycling stability with a Coulombic efficiency of ~100%. This work could open an avenue for achieving long cycle life and high-power lithium-selenium batteries.

scholarly journals Surface nitridation of Li4Ti5O12 by thermal decomposition of urea to improve quick charging capability of lithium ion batteries

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jihyun Jang ◽  
Tae Hun Kim ◽  
Ji Heon Ryu
Keyword(s):  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Electronic Conductivity ◽  
Rate Capability ◽  
Negative Electrode ◽  
Lithium Ion ◽  
High Rate ◽  
High Electronic Conductivity ◽  
Negative Electrode Material ◽  
Initial Coulombic Efficiency

AbstractAs the application of lithium-ion batteries in electric vehicles increases, the demand for improved charging characteristics of batteries is also increasing. Lithium titanium oxide (Li4Ti5O12, LTO) is a negative electrode material with high rate characteristics, but further improvement in rate characteristics is needed for achieving the quick-charging performance required by electric vehicle markets. In this study, the surface of LTO was coated with a titanium nitride (TiN) layer using urea and an autogenic reactor, and electrochemical performance was improved (initial Coulombic efficiency and the rate capability were improved from 95.6 to 4.4% for pristine LTO to 98.5% and 53.3% for urea-assisted TiN-coated LTO, respectively. We developed a process for commercial production of surface coatings using eco-friendly material to further enhance the charging performance of LTO owing to high electronic conductivity of TiN.

scholarly journals A porous 3D-RGO@MWCNT hybrid material as Li–S battery cathode

2019 ◽  
Vol 10 ◽  
pp. 514-521 ◽  
Author(s):  
Yongguang Zhang ◽  
Jun Ren ◽  
Yan Zhao ◽  
Taizhe Tan ◽  
Fuxing Yin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
3D Structure ◽  
Three Dimensional ◽  
Rate Capability ◽  
Composite Matrix ◽  
Multiwalled Carbon ◽  
Shuttle Effect ◽  
Reduced Graphene

In this work, a unique three-dimensional (3D) structured carbon-based composite was synthesized. In the composite, multiwalled carbon nanotubes (MWCNT) form a lattice matrix in which porous spherical reduced graphene oxide (RGO) completes the 3D structure. When used in Li–S batteries, the 3D porous lattice matrix not only accommodates a high content of sulfur, but also induces a confinement effect towards polysulfide, and thereby reduces the “shuttle effect”. The as-prepared S-3D-RGO@MWCNT composite delivers an initial specific capacity of 1102 mAh·g−1. After 200 charging/discharge cycles, a capacity of 805 mAh·g−1 and a coulombic efficiency of 98% were maintained, implying the shuttle effect was greatly suppressed by the composite matrix. In addition, the S-3D-RGO@MWCNT composite also exhibits an excellent rate capability.

Porous and high electronic conductivity nitrogen-doped nano-sheet carbon derived from polypyrrole for high-power supercapacitors

Carbon ◽  
2016 ◽  
Vol 107 ◽  
pp. 638-645 ◽  
Author(s):  
Jianbo Zhu ◽  
Youlong Xu ◽  
Yuan Zhang ◽  
Tianyu Feng ◽  
Jie Wang ◽  
...  
Keyword(s):  
High Power ◽  
Electronic Conductivity ◽  
Nitrogen Doped ◽  
High Electronic Conductivity

MOF-derived Carbon Host Associated with Fe and Co Single atoms for Li-Se Batteries

2021 ◽  
Author(s):  
Yuqing Cao ◽  
Feifei Lei ◽  
Yunliang Li ◽  
Shilun Qiu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electronic Conductivity ◽  
Storage Material ◽  
Single Atoms ◽  
High Electronic Conductivity ◽  
Energy Storage Material

Lithium-selenium (Li-Se) batteries is considered as a promising energy storage material due to high electronic conductivity and volume capacity. However, the performance of Li-Se batteries is far away from commercial...

scholarly journals A Novel Strategy of In Situ Trimerization of Cyano Groups Between the Ti3C2Tx (MXene) Interlayers for High-Energy and High-Power Sodium-Ion Capacitors

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Siyang Liu ◽  
Fangyuan Hu ◽  
Wenlong Shao ◽  
Wenshu Zhang ◽  
Tianpeng Zhang ◽  
...  
Keyword(s):  
High Power ◽  
Electronic Conductivity ◽  
High Energy ◽  
Ring Structure ◽  
High Energy Density ◽  
High Electronic Conductivity ◽  
N Doping ◽  
Cyano Groups ◽  
Novel Strategy

Abstract2D MXenes are attractive for energy storage applications because of their high electronic conductivity. However, it is still highly challenging for improving the sluggish sodium (Na)-ion transport kinetics within the MXenes interlayers. Herein, a novel nitrogen-doped Ti3C2Tx MXene was synthesized by introducing the in situ polymeric sodium dicyanamide (Na-dca) to tune the complex terminations and then utilized as intercalation-type pseudocapacitive anode of Na-ion capacitors (NICs). The Na-dca can intercalate into the interlayers of Ti3C2Tx nanosheets and simultaneously form sodium tricyanomelaminate (Na3TCM) by the catalyst-free trimerization. The as-prepared Ti3C2Tx/Na3TCM exhibits a high N-doping of 5.6 at.% in the form of strong Ti–N bonding and stabilized triazine ring structure. Consequently, coupling Ti3C2Tx/Na3TCM anode with different mass of activated carbon cathodes, the asymmetric MXene//carbon NICs are assembled. It is able to deliver high energy density (97.6 Wh kg−1), high power output (16.5 kW kg−1), and excellent cycling stability (≈ 82.6% capacitance retention after 8000 cycles).

scholarly journals High-Performance Lithium Sulfur Batteries Based on Multidimensional Graphene-CNT-Nanosulfur Hybrid Cathodes

Batteries ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 26
Author(s):  
Álvaro Doñoro ◽  
Álvaro Muñoz-Mauricio ◽  
Vinodkumar Etacheri
Keyword(s):  
High Performance ◽  
Coulombic Efficiency ◽  
Electronic Conductivity ◽  
Specific Capacity ◽  
Synthesis Method ◽  
Graphene Nanoplatelets ◽  
Practical Implementation ◽  
Electrochemical Performances ◽  
High Electronic Conductivity ◽  
Lithium Sulfur

Although lithium-sulfur (Li-S) batteries are one of the promising candidates for next-generation energy storage, their practical implementation is limited by rapid capacity fading due to lithium polysulfide (LiPSs) formation and the low electronic conductivity of sulfur. Herein, we report a high-performance lithium-sulfur battery based on multidimensional cathode architecture consisting of nanosulfur, graphene nanoplatelets (2D) and multiwalled carbon nanotubes (1D). The ultrasonic synthesis method results in the generation of sulfur nanoparticles and their intercalation into the multilayered graphene nanoplatelets. The optimized multidimensional graphene-sulfur-CNT hybrid cathode (GNS58-CNT10) demonstrated a high specific capacity (1067 mAh g−1 @ 50 mA g−1), rate performance (539 @ 1 A g−1), coulombic efficiency (~95%) and cycling stability (726 mAh g−1 after 100 cycles @ 200 mA g−1) compared to the reference cathode. Superior electrochemical performances are credited to the encapsulation of nanosulfur between the individual layers of graphene nanoplatelets with high electronic conductivity, and effective polysulfide trapping by MWCNT bundles.

scholarly journals High-Energy and High-Power Pseudocapacitor–Battery Hybrid Sodium-Ion Capacitor with Na+ Intercalation Pseudocapacitance Anode

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Qiulong Wei ◽  
Qidong Li ◽  
Yalong Jiang ◽  
Yunlong Zhao ◽  
Shuangshuang Tan ◽  
...  
Keyword(s):  
Energy Density ◽  
High Power ◽  
Anode Materials ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Rate Capability ◽  
High Energy ◽  
Sodium Ion ◽  
High Energy Density

AbstractHigh-performance and low-cost sodium-ion capacitors (SICs) show tremendous potential applications in public transport and grid energy storage. However, conventional SICs are limited by the low specific capacity, poor rate capability, and low initial coulombic efficiency (ICE) of anode materials. Herein, we report layered iron vanadate (Fe5V15O39 (OH)9·9H2O) ultrathin nanosheets with a thickness of ~ 2.2 nm (FeVO UNSs) as a novel anode for rapid and reversible sodium-ion storage. According to in situ synchrotron X-ray diffractions and electrochemical analysis, the storage mechanism of FeVO UNSs anode is Na+ intercalation pseudocapacitance under a safe potential window. The FeVO UNSs anode delivers high ICE (93.86%), high reversible capacity (292 mAh g−1), excellent cycling stability, and remarkable rate capability. Furthermore, a pseudocapacitor–battery hybrid SIC (PBH-SIC) consisting of pseudocapacitor-type FeVO UNSs anode and battery-type Na3(VO)2(PO4)2F cathode is assembled with the elimination of presodiation treatments. The PBH-SIC involves faradaic reaction on both cathode and anode materials, delivering a high energy density of 126 Wh kg−1 at 91 W kg−1, a high power density of 7.6 kW kg−1 with an energy density of 43 Wh kg−1, and 9000 stable cycles. The tunable vanadate materials with high-performance Na+ intercalation pseudocapacitance provide a direction for developing next-generation high-energy capacitors.

scholarly journals Performance of the Chemical and Electrochemical Composites of PPy/CNT as Electrodes in Type I Supercapacitors

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
S. C. Canobre ◽  
F. F. S. Xavier ◽  
W. S. Fagundes ◽  
A. C. de Freitas ◽  
F. A. Amaral
Keyword(s):  
Coulombic Efficiency ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Promising Material ◽  
Cyclic Voltammograms ◽  
Type I ◽  
Counter Electrodes ◽  
Light Emitting Devices ◽  
High Electronic Conductivity ◽  
P Type

Polypyrrole (PPy) is one of the most studied conducting polymers and a very promising material for various applications such as lithium-ion secondary batteries, light-emitting devices, capacitors, and supercapacitors, owing to its many advantages, including good processability, easy handling, and high electronic conductivity. In this work, PPy films were chemically and electrochemically synthesized, both in and around carbon nanotubes (CNTs). The cyclic voltammograms of the device, composed of the electrochemically synthesized PPy/CNT composites as working and counter electrodes (Type I supercapacitor with p-type doping), showed a predominantly capacitive profile with low impedance values and good electrochemical stability, with the anodic charge remaining almost constant (11.38 mC), a specific capacitance value of 530 F g−1after 50 charge and discharge cycles, and a coulombic efficiency of 99.2%. The electrochemically synthesized PPy/CNT composite exhibited better electrochemical properties compared to those obtained for the chemically synthesized composite. Thus, the electrochemically synthesized PPy/CNT composite is a promising material to be used as electrodes in Type I supercapacitors.

scholarly journals MnO2-Coated Dual Core–Shell Spindle-Like Nanorods for Improved Capacity Retention of Lithium–Sulfur Batteries

2020 ◽  
Vol 4 (2) ◽  
pp. 42 ◽  
Author(s):  
Hamza Dunya ◽  
Maziar Ashuri ◽  
Dana Alramahi ◽  
Zheng Yue ◽  
Kamil Kucuk ◽  
...  
Keyword(s):  
High Performance ◽  
Synergistic Effects ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Core Shell ◽  
Shuttle Effect ◽  
Lithium Sulfur Batteries ◽  
Hollow Carbon ◽  
Dual Core ◽  
Lithium Sulfur

The emerging need for high-performance lithium–sulfur batteries has motivated many researchers to investigate different designs. However, the polysulfide shuttle effect, which is the result of dissolution of many intermediate polysulfides in electrolyte, has still remained unsolved. In this study, we have designed a sulfur-filled dual core–shell spindle-like nanorod structure coated with manganese oxide (S@HCNR@MnO2) to achieve a high-performance cathode for lithium–sulfur batteries. The cathode showed an initial discharge capacity of 1661 mA h g−1 with 80% retention of capacity over 70 cycles at a 0.2C rate. Furthermore, compared with the nanorods without any coating (S@HCNR), the MnO2-coated material displayed superior rate capability, cycling stability, and Coulombic efficiency. The synergistic effects of the nitrogen-doped hollow carbon host and the MnO2 second shell are responsible for the improved electrochemical performance of this nanostructure.

scholarly journals Nano-Fe3O4/Carbon Nanotubes Composites by One-Pot Microwave Solvothermal Method for Supercapacitor Applications

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2908
Author(s):  
Sul Ki Park ◽  
Jagadeesh Sure ◽  
D. Sri Maha Vishnu ◽  
Seong Jun Jo ◽  
Woo Cheol Lee ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Mechanical Stability ◽  
Storage System ◽  
Electronic Conductivity ◽  
Rate Capability ◽  
One Pot ◽  
High Electronic Conductivity ◽  
Nano Fe3o4

Carbon nanotubes (CNTs) are being increasingly studied as electrode materials for supercapacitors (SCs) due to their high electronic conductivity and chemical and mechanical stability. However, their energy density and specific capacitance have not reached the commercial stage due to their electrostatic charge storage system via a non-faradic mechanism. Moreover, magnetite (Fe3O4) exhibits higher specific capacitance originating from its pseudocapacitive behaviour, while it has irreversible volume expansion during cycling. Therefore, a very interesting and facile strategy to arrive at better performance and stability is to integrate CNTs and Fe3O4. In this study, we demonstrate the microwave-solvothermal process for the synthesis of Fe3O4 nanoparticles uniformly grown on a CNT composite as an electrode for SCs. The synthesized Fe3O4/CNT composite delivers a reversible capacitance of 187.1 F/g at 1 A/g, superior rate capability by maintaining 61.6% of 10 A/g (vs. 1 A/g), and cycling stability of 80.2% after 1000 cycles at 1 A/g.

Sign in / Sign up

Export Citation Format

Share Document