scholarly journals Effect of PAN Oxidation on the Electrochemical Lithium Insertion/Deinsertion Behavior of Resultant Carbons

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Aleksandra Piotrowska ◽  
Krzysztof Kierzek ◽  
Jacek Machnikowski
Keyword(s):  
Low Voltage ◽  
Coulombic Efficiency ◽  
Pyrolytic Carbon ◽  
Reversible Capacity ◽  
Lithium Insertion ◽  
Irreversible Capacity ◽  
Galvanostatic Charge ◽  
Air Treatment ◽  
Heat Treated ◽  
Oxidation Depth

The effect of polyacrylonitrile (PAN) oxidation on the properties and electrochemical lithium insertion/deinsertion behavior of carbons produced in the temperature range of 1000–1150°C has been assessed. Air-treatment at 220 and 240°C modifies essentially the carbonization behavior of polymer leading to materials with developed microporosity and enhanced oxygen content in contrast to practically nonporous pristine PAN-based carbon. The extent of the modification increases with the oxidation depth and decreases with HTT. Galvanostatic charge/discharge reveals typical hard carbons characteristics of all the materials. PAN-based carbon heat-treated at 1050°C represents most promising anodic performance. It gives reversible capacity (Crev) near 420 mAh g−1with a reasonable coulombic efficiency during cycling of ~99% and a moderate low voltage capacity of 100 mAh g−1. Extensive oxidation enhances overall 1st discharge cycle capacity to 870 mAh g−1andCrevto 560 mAh g−1; however, large irreversible capacity (Cirr) and poor cycleability are serious drawbacks of all carbons from oxidized PAN. Pyrolytic carbon coating using methane CVD at 830°C is effective in suppressingCirrby about 30% but the cycleability remains nonacceptable.

Electrochemical construction and sodium storage performance of three-dimensional porous self-supported MoS2 electrodes

2018 ◽  
Vol 11 (03) ◽  
pp. 1850050 ◽  
Author(s):  
Xiao-Yong Fan ◽  
Pan Liu ◽  
Shan Wang ◽  
Jiaxing Han ◽  
Kefan Ni ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Coulombic Efficiency ◽  
Three Dimensional ◽  
Reversible Capacity ◽  
Volumetric Expansion ◽  
Storage Performance ◽  
High Temperature Heat Treatment ◽  
Heat Treated ◽  
Electrochemical Cycling ◽  
Sodium Storage

Three-dimensional (3D) porous self-supported MoS2 electrodes are constructed by electrodepositing coupled with high-temperature heat treatment using 3D porous Cu prepared via electroless plating as the substrate, and directly used as anode of sodium-ion battery. The 3D porous structure can accommodate the volumetric expansion/shrinkage and alleviate the stress caused from the large volumetric changes of MoS2 electrodes during electrochemical cycling. Meanwhile, large surface area of this unique configuration enables sufficient electrode/electrolyte interaction and fast electron transportation. Besides, the influence of heat treatment temperatures on the sodium storage performance of MoS2 electrode is also investigated. The electrochemical test result shows that the 3D porous self-supported MoS2 electrode heat treated at 350[Formula: see text]C has the best electrochemical performance. It demonstrates a high first reversible capacity of 714.1[Formula: see text]mAh g[Formula: see text] at 50[Formula: see text]mA g[Formula: see text] with a high first Coulombic efficiency of 84%, and a good capacity retention of 306.8[Formula: see text]mAh g[Formula: see text] after 100 cycles at 2[Formula: see text]A g[Formula: see text]. The reversible capacity at 3.2[Formula: see text]A g[Formula: see text] shows high value of 241[Formula: see text]mAh g[Formula: see text], which is 37% of that at 0.05[Formula: see text]A g[Formula: see text].

Spinel Li4Ti5O12/C Composites as Potential Anode Materials of Lithium Batteries

2007 ◽  
Vol 336-338 ◽  
pp. 513-516
Author(s):  
Jun Rong Li ◽  
Zi Long Tang ◽  
Shao Hua Luo ◽  
Jun Biao Lu ◽  
Zhong Tai Zhang
Keyword(s):  
Grain Size ◽  
Electrochemical Properties ◽  
Lithium Batteries ◽  
Anode Materials ◽  
Electronic Conductivity ◽  
Pyrolytic Carbon ◽  
Reversible Capacity ◽  
Lithium Insertion ◽  
Energy Storage Devices ◽  
Storage Devices

Here the spinel Li4Ti5O12/C composites were prepared by a modified high temperature solid-state reaction. The as prepared Li4Ti5O12/C composites showed enhanced electrochemical lithium insertion performance in reversible capacity and rate capabilities. The improved electrochemical properties are attributed to the reduced grain size and the improved electronic conductivity caused by the pyrolytic carbon incorporated into the spinel Li4Ti5O12 particle. The spinel Li4Ti5O12/C composites with improved electrochemical properties may find versatile applications in various energy storage devices.

scholarly journals Decoupling the origins of irreversible coulombic efficiency in anode-free lithium metal batteries

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chen-Jui Huang ◽  
Balamurugan Thirumalraj ◽  
Hsien-Chu Tao ◽  
Kassie Nigus Shitaw ◽  
Hogiartha Sutiono ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Rate Capability ◽  
Reversible Capacity ◽  
Data Interpretation ◽  
Lithium Metal ◽  
Safety Hazards ◽  
Practical Applications ◽  
Lithium Metal Batteries ◽  
Metallic Lithium ◽  
Other Information

AbstractAnode-free lithium metal batteries are the most promising candidate to outperform lithium metal batteries due to higher energy density and reduced safety hazards with the absence of metallic lithium anode during initial cell fabrication. In general, researchers report capacity retention, reversible capacity, or rate capability of the cells to study the electrochemical performance of anode-free lithium metal batteries. However, evaluating the behavior of batteries from limited aspects may easily overlook other information hidden deep inside the meretricious results or even lead to misguided data interpretation. In this work, we present an integrated protocol combining different types of cell configuration to determine various sources of irreversible coulombic efficiency in anode-free lithium metal cells. The decrypted information from the protocol provides an insightful understanding of the behaviors of LMBs and AFLMBs, which promotes their development for practical applications.

Boron-doped porous Si anode materials with high initial coulombic efficiency and long cycling stability

2018 ◽  
Vol 6 (7) ◽  
pp. 3022-3027 ◽  
Author(s):  
Ming Chen ◽  
Bo Li ◽  
Xuejiao Liu ◽  
Ling Zhou ◽  
Lin Yao ◽  
...  
Keyword(s):  
Anode Materials ◽  
Coulombic Efficiency ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Cycling Stability ◽  
Porous Si ◽  
Boron Doped ◽  
Si Anode ◽  
Initial Coulombic Efficiency

B-Doped pSi exhibits an exceptionally high initial coulombic efficiency of 89% and shows outstanding cycling performance (reversible capacity of 1500 mA h g−1 at 2 A g−1 after 300 cycles).

Synthesis and Electrochemical Performance of SnO2/Graphene Hybrid Anode for Lithium Ion Batteries

2013 ◽  
Vol 1540 ◽  
Author(s):  
Chia-Yi Lin ◽  
Chien-Te Hsieh ◽  
Ruey-Shin Juang
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Homogeneous Distribution

ABSTRACTAn efficient microwave-assisted polyol (MP) approach is report to prepare SnO2/graphene hybrid as an anode material for lithium ion batteries. The key factor to this MP method is to start with uniform graphene oxide (GO) suspension, in which a large amount of surface oxygenate groups ensures homogeneous distribution of the SnO2 nanoparticles onto the GO sheets under the microwave irradiation. The period for the microwave heating only takes 10 min. The obtained SnO2/graphene hybrid anode possesses a reversible capacity of 967 mAh g-1 at 0.1 C and a high Coulombic efficiency of 80.5% at the first cycle. The cycling performance and the rate capability of the hybrid anode are enhanced in comparison with that of the bare graphene anode. This improvement of electrochemical performance can be attributed to the formation of a 3-dimensional framework. Accordingly, this study provides an economical MP route for the fabrication of SnO2/graphene hybrid as an anode material for high-performance Li-ion batteries.

Influence of Heating Temperature on Structure, Morphology and Electrochemical Performance of LiV3O8 Cathode for Lithium-Ion Batteries Application

2020 ◽  
Vol 1010 ◽  
pp. 314-320
Author(s):  
Mohamad Izha Ishak ◽  
Khairel Rafezi Ahmad ◽  
Rozana A.M. Osman ◽  
Mohd Sobri Idris
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Layered Structure ◽  
Heating Temperature ◽  
Lithium Ion ◽  
Galvanostatic Charge ◽  
Heat Treated ◽  
Structure Morphology ◽  
Performance Results ◽  
Charge Discharge

LiV3O8 layered structure was successfully synthesized by a conventional solid-state approach and subsequent heat-treated at 400, 450, 500 and 550 oC. The samples were characterized by XRD, SEM, TEM, BET. Electrochemical performance of LiV3O8 was investigated by cyclic voltammetry (CV) and galvanostatic charge-discharge. The results showed that high purity of LiV3O8 with layered structure was formed. The morphology of the samples were mixed between nanorods and nanosheets structure. For electrochemical performance, results showed that LiV3O8 heat-treated at 500 oC performed a highest charge and discharge capacity of 212 and 172 mAh g-1, respectively. From electrochemical performance results made them a good candidate for cathode material for lithium-ion batteries application.

scholarly journals Improved lithium-ion battery anode capacity with a network of easily fabricated spindle-like carbon nanofibers

2016 ◽  
Vol 7 ◽  
pp. 1289-1295 ◽  
Author(s):  
Mengting Liu ◽  
Wenhe Xie ◽  
Lili Gu ◽  
Tianfeng Qin ◽  
Xiaoyi Hou ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Lithium Ion ◽  
Carbon Matrix ◽  
Reversible Capacity ◽  
Excellent Electrochemical Performance ◽  
Rate Capacity ◽  
Binder Free ◽  
Carbon Network

A novel network of spindle-like carbon nanofibers was fabricated via a simplified synthesis involving electrospinning followed by preoxidation in air and postcarbonization in Ar. Not only was the as-obtained carbon network comprised of beads of spindle-like nanofibers but the cubic MnO phase and N elements were successfully anchored into the amorphous carbon matrix. When directly used as a binder-free anode for lithium-ion batteries, the network showed excellent electrochemical performance with high capacity, good rate capacity and reliable cycling stability. Under a current density of 0.2 A g−1, it delivered a high reversible capacity of 875.5 mAh g−1 after 200 cycles and 1005.5 mAh g−1 after 250 cycles with a significant coulombic efficiency of 99.5%.

Synthesis and investigation of layered GeS as a promising large capacity anode with low voltage and high efficiency in full-cell Li-ion batteries

2017 ◽  
Vol 1 (8) ◽  
pp. 1607-1614 ◽  
Author(s):  
Yaqing Wei ◽  
Jun He ◽  
Qing Zhang ◽  
Chang Liu ◽  
Ameng Wang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Voltage ◽  
Coulombic Efficiency ◽  
Cell Voltage ◽  
Li Ion Batteries ◽  
High Cell ◽  
Lithium Storage ◽  
Large Capacity ◽  
Full Cell ◽  
Li Ion

Layered GeS shows a large capacity of 1768 mA h g−1 with a coulombic efficiency of 94% for lithium storage. With good stability and a low voltage in alloying region, the LiCoO2//GeS full cell exhibits both high cell voltage and large capacity.

Structure and Electrochemical Properties of O3-Type Layered LixMn0.5Ni0.25Ti0.25O2 Prepared by Ion-Exchange

2013 ◽  
Vol 566 ◽  
pp. 123-126
Author(s):  
Naoya Ishida ◽  
Hiroshi Hayakawa ◽  
Junji Akimoto ◽  
Hideka Shibuya ◽  
Junichi Imaizumi
Keyword(s):  
Ion Exchange ◽  
Layered Structure ◽  
Spinel Structure ◽  
Reversible Capacity ◽  
Lithium Insertion ◽  
Voltage Profile ◽  
Voltage Range ◽  
Starting Compound ◽  
Extraction Properties ◽  
Li Ion

Li0.55Na0.03Mn0.5Ni0.25Ti0.25O2was prepared via Na/Li ion exchange from Na0.7Mn0.5Ni0.25Ti0.25O2as a starting compound. Li0.55Na0.03Mn0.5Ni0.25Ti0.25O2is a layered rocksalt-type oxide with the O3 structure. The electrochemical lithium insertion/extraction properties of O3-Li0.55Na0.03Mn0.5Ni0.25Ti0.25O2exhibits a reversible capacity of approximately 190 mAh g-1in the voltage range between 2.0 and 4.8 V. The voltage profile consists of two plateaus around 4.0 and 3.0 V. The layered structure remains unchanged and does not transform to the spinel structure during cycling.

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