scholarly journals Energetic-Materials-Driven Synthesis of Graphene-Encapsulated Tin Oxide Nanoparticles for Sodium-Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2550
Author(s):  
Yingchun Wang ◽  
Jinxu Liu ◽  
Min Yang ◽  
Lijuan Hou ◽  
Tingting Xu ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Energetic Materials ◽  
High Speed ◽  
Coulombic Efficiency ◽  
Sno2 Nanoparticles ◽  
Direct Synthesis ◽  
Exothermic Reaction ◽  
Rate Capability ◽  
Rapid Expansion ◽  
Core Shell

By evenly mixing polytetrafluoroethylene-silicon energetic materials (PTFE-Si EMs) with tin oxide (SnO2) particles, we demonstrate a direct synthesis of graphene-encapsulated SnO2 (Gr-SnO2) nanoparticles through the self-propagated exothermic reaction of the EMs. The highly exothermic reaction of the PTFE-Si EMs released a huge amount of heat that induced an instantaneous temperature rise at the reaction zone, and the rapid expansion of the gaseous SiF4 product provided a high-speed gas flow for dispersing the molten particles into finer nanoscale particles. Furthermore, the reaction of the PTFE-NPs with Si resulted in a simultaneous synthesis of graphene that encapsulated the SnO2 nanoparticles in order to form the core-shell nanostructure. As sodium storage material, the graphene-encapsulated SnO2 nanoparticles exhibit a good cycling performance, superior rate capability, and a high initial Coulombic efficiency of 85.3%. This proves the effectiveness of our approach for the scalable synthesis of core-shell-structured graphene-encapsulated nanomaterials.

SiO2@NiO core–shell nanocomposites as high performance anode materials for lithium-ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 63012-63016 ◽  
Author(s):  
Yourong Wang ◽  
Wei Zhou ◽  
Liping Zhang ◽  
Guangsen Song ◽  
Siqing Cheng
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Stability ◽  
Core Shell ◽  
Excellent Cycling Stability

A SiO2@NiO core–shell electrode exhibits almost 100% coulombic efficiency, excellent cycling stability and rate capability after the first few cycles.

Elaborate synthesis of black tin oxide–black titanium oxide core–shell nanotubes for ultrastable and fast lithium storage

2018 ◽  
Vol 54 (38) ◽  
pp. 4790-4793 ◽  
Author(s):  
Zheng-Wei Zhou ◽  
Long Pan ◽  
Yi-Tao Liu ◽  
Xiao-Dong Zhu ◽  
Xu-Ming Xie
Keyword(s):  
Titanium Oxide ◽  
Tin Oxide ◽  
Rate Capability ◽  
Core Shell ◽  
Lithium Storage ◽  
Co Reduction

We report on the elaborate synthesis of TiO2−x@SnO2−x nanotubes by NaBH4 co-reduction, in which the synergistic interplay between the SnO2−x core and the TiO2−x shell results in superior cyclability and rate capability for ultrastable and fast lithium storage.

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.

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.

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.

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.

scholarly journals Achieving High-Performance Spherical Natural Graphite Anode through a Modified Carbon Coating for Lithium-Ion Batteries

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1946 ◽  
Author(s):  
Hae-Jun Kwon ◽  
Sang-Wook Woo ◽  
Yong-Ju Lee ◽  
Je-Young Kim ◽  
Sung-Man Lee
Keyword(s):  
High Performance ◽  
Carbon Coating ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Rate Performance ◽  
Natural Graphite ◽  
Artificial Graphite ◽  
Ag Electrodes ◽  
Natural Graphite Anode

The electrochemical performance of modified natural graphite (MNG) and artificial graphite (AG) was investigated as a function of electrode density ranging from 1.55 to 1.7 g∙cm−3. The best performance was obtained at 1.55 g∙cm−3 and 1.60 g∙cm−3 for the AG and MNG electrodes, respectively. Both AG, at a density of 1.55 g∙cm−3, and MNG, at a density of 1.60 g∙cm−3, showed quite similar performance with regard to cycling stability and coulombic efficiency during cycling at 30 and 45 °C, while the MNG electrodes at a density of 1.60 g∙cm−3 and 1.7 g∙cm−3 showed better rate performance than the AG electrodes at a density of 1.55 g∙cm−3. The superior rate capability of MNG electrodes can be explained by the following effects: first, their spherical morphology and higher electrode density led to enhanced electrical conductivity. Second, for the MNG sample, favorable electrode tortuosity was retained and thus Li+ transport in the electrode pore was not significantly affected, even at high electrode densities of 1.60 g∙cm−3 and 1.7 g∙cm−3. MNG electrodes also exhibited a similar electrochemical swelling behavior to the AG electrodes.

scholarly journals Stable Lithium-Carbon Composite Enabled by Dual-Salt Additives

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Lei Zheng ◽  
Feng Guo ◽  
Tuo Kang ◽  
Yingzhu Fan ◽  
Wei Gu ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Solid Electrolyte Interphase ◽  
Rate Capability ◽  
Negative Electrode ◽  
High Energy ◽  
Carbon Composite ◽  
High Reactivity ◽  
Cycling Stability ◽  
High Energy Density ◽  
Lithium Metal

AbstractLithium metal is regarded as the ultimate negative electrode material for secondary batteries due to its high energy density. However, it suffers from poor cycling stability because of its high reactivity with liquid electrolytes. Therefore, continuous efforts have been put into improving the cycling Coulombic efficiency (CE) to extend the lifespan of the lithium metal negative electrode. Herein, we report that using dual-salt additives of LiPF6 and LiNO3 in an ether solvent-based electrolyte can significantly improve the cycling stability and rate capability of a Li-carbon (Li-CNT) composite. As a result, an average cycling CE as high as 99.30% was obtained for the Li-CNT at a current density of 2.5 mA cm–2 and an negative electrode to positive electrode capacity (N/P) ratio of 2. The cycling stability and rate capability enhancement of the Li-CNT negative electrode could be attributed to the formation of a better solid electrolyte interphase layer that contains both inorganic components and organic polyether. The former component mainly originates from the decomposition of the LiNO3 additive, while the latter comes from the LiPF6-induced ring-opening polymerization of the ether solvent. This novel surface chemistry significantly improves the CE of Li negative electrode, revealing its importance for the practical application of lithium metal batteries.

Core-shell structured S@CuO/δ-MnO2 composites as cathodes for lithium-sulfur batteries

CrystEngComm ◽  
2021 ◽  
Author(s):  
Guiying Xu ◽  
Yongying Li ◽  
Hui Cheng ◽  
Guan Liu ◽  
Ziyang Yang ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Cycle Life ◽  
Core Shell ◽  
Practical Application ◽  
Short Cycle ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur ◽  
Capacity Decay

The dissolution of polysulfides (LiPSs) always leads to low Coulombic efficiency, dramatic capacity decay, and short cycle life, which hinders the practical application of lithium-sulfur (Li-S) batteries. In this study,...

LaPO4-coated Li1.2Mn0.56Ni0.16Co0.08O2 as a cathode material with enhanced coulombic efficiency and rate capability for lithium ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 77324-77331 ◽  
Author(s):  
Qingliang Xie ◽  
Chenhao Zhao ◽  
Zhibiao Hu ◽  
Qi Huang ◽  
Cheng Chen ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Combustion Method ◽  
Chemical Precipitation ◽  
Porous Microspheres

Layered Li[Li0.2Mn0.56Ni0.16Co0.08]O2 porous microspheres have been successfully synthesized by a urea combustion method, and then coated with appropriate amount of LaPO4via a facile chemical precipitation route.

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