Article
Chemistry, Analytical
Maral Ghahramani, Susan Hamidi, Mahsa Mohammad, Mehran Javanbakht, Pooya Gorji
Summary: In this study, sulfonated copolymer was used as an effective binder to improve the efficiency of lithium-ion batteries. The investigation showed that the use of sulfonated PVDF binder resulted in decreased concentration polarization and improved lithiation and delithiation kinetics for LiFePO4 electrodes. After 300 cycles, the discharge capacity remained 90 mAh g-1 with a capacity retention of 100% at 1C.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Review
Chemistry, Physical
Zhaojin Li, Jinxing Yang, Tianjia Guang, Bingbing Fan, Kongjun Zhu, Xiaohui Wang
Summary: This paper summarizes the recent progress in controlled hydrothermal/solvothermal synthesis of LiFePO4 and explores the relationship between the synthesis conditions and the nucleation-and-growth of LiFePO4. The review covers surface decoration, lattice substitution, and defect control, while also discussing new research directions and future trends in the field.
Article
Electrochemistry
Jing Geng, Shuchao Zhang, Zhengguang Zou, Jie Liu, Shenglin Zhong
Summary: In this study, lithium iron phosphate (LiFePO4) cathode materials were synthesized with the solvothermal method assisted by different surfactants. The effects of various surfactants on the microstructure and electrochemical performance of LiFePO4 were investigated, revealing different morphologies and initial discharge capacities for the materials synthesized with different surfactants. The LiFePO4 materials prepared with surfactant assistance showed good cyclic stability despite lower initial discharge capacities compared to those prepared without surfactant assistance.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2021)
Article
Chemistry, Physical
Qiulin Chen, Hailang Liu, Junxian Hu, Li Wang, Yin Li, Yaochun Yao
Summary: In recent years, LiFePO4 has gained attention as an excellent cathode material for lithium-ion batteries, but its low conductivity poses a major disadvantage. A nitrogen-doped carbon coating on LiFePO4 is found to be an effective solution to this drawback. This study presents a novel method for fabricating nitrogen-doped carbon-coated LiFePO4 using sucrose and tripolycyanamide as carbon and nitrogen sources, respectively. The nitrogen-doped carbon layer on LiFePO4 forms a core-shell conductive network, promoting electron migration and enhancing electrochemical performances. The LFP/C-N-1.25 with 1.25 wt% N modification exhibits high specific capacities, better rate performance, and favorable lithium ion diffusion coefficient, suggesting its potential as a cathode material for lithium-ion batteries.
Article
Materials Science, Multidisciplinary
X. Nie, J. Xiong
Summary: The LiMn0.1Fe0.9PO4/C composite with enhanced electrochemical performance through Mn doping exhibits improved initial discharge capacities, attributed to the columnar effect of the Mn-stabilized crystal structure and increased lithium-ion diffusion rate caused by Mn doping.
Article
Chemistry, Physical
Yu Huang, Kai Wu, Ronghui Hao, Wenkang Miao, Yueling Cai, Peng Wang, Jipeng Cheng, Zihan Wang, Qianqian Li, Bingkun Guo, Anmin Nie
Summary: Li2MnO3, as a traditional member of lithium-rich layered cathodes, shows large specific capacity, but suffers from capacity fading and voltage decay. Iridium doping improves electrochemical performance, with dopant concentration and calcination temperature affecting the performance due to intrinsic microstructure and crystallization. The mechanism of improvement lies in the structure stability induced by iridium doping in TM sites, enhancing high-capacity cathode materials for lithium-ion batteries.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Yin Li, Li Wang, Feng Liang, Yaochun Yao, Keyu Zhang
Summary: This study successfully improved the electronic conductivity and lithium ion mobility of LiFePO4 through boron doping at the P-site, enhancing its electrochemical performance. The LiFeP0.98B0.02O4-delta/C exhibited the best performance, delivering a first discharge capacity of 138 mAh g(-1) at 2C with no evident capacity fading after 300 cycles. However, excessive doping of boron could lead to oxygen defects in the material, resulting in unfavorable electrochemical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Ezgi Gultek, Sebahat Altundag, Serdar Altin, Emine Altin
Summary: In this study, LiFe1-xPbxPO4 (x = 0-0.12) powders were successfully synthesized by solid-state technique. The main phase of the samples is LiFePO4 with minor impurity phases of PbO and Fe2O3. Increasing Pb-content leads to a decrease in resistance and an increase in redox peak wideness, while maintaining good cycling stability. The results suggest that doping has a positive effect on improving the performance of LiFePO4 cells.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Wenqin Ling, Zhengguang Zou, Shuchao Zhang, Xiaoxiao Peng, Shiying Luo, Xin Tang, Jing Geng
Summary: Heteroatom doping is a common modification method for lithium-ion battery electrodes, and it can improve the electrochemical performance of materials. In this study, CO2-modified VO2(B) nanorods were synthesized, resulting in a CO2-VO2 electrode with high rate capacity and capacity retention. The role of CO2 small molecules as a pillar in the interlayer of VO2(B) and the weak electrostatic attraction between OCO2 and Li+ contribute to the stability and diffusion of lithium ions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Asuman Celik-Kucuk, Takeshi Abe
Summary: Poly(methyl(2-(tris(2-H methoxyethoxy)silyl)ethyl)siloxane)) modified with Si-tripodant centers (2550EO) and integrated amide salt (LiF(SO2CF3)2 (LiTFSI)) has been used as a binding agent in lithium-ion batteries containing LiFePO4 (LFP). The performance of the LFP cathode using 2550EO/LiTFSI as a binder was evaluated through various tests. Comparisons were made with alternative binders such as PVDF, PEO, and 2550EO at different temperatures. The use of 2550EO/LiTFSI as a binder significantly improved the rate capability and cycle stability of the LFP cathode due to the formation of a thin solid-electrolyte interface (SEI), uniform dispersion of materials, and enhanced adhesion to the current collector.
JOURNAL OF POWER SOURCES
(2023)
Article
Materials Science, Multidisciplinary
Can Wang, Xunlong Yuan, Huiyun Tan, Shuofeng Jian, Ziting Ma, Junjie Zhao, Xuewen Wang, Dapeng Chen, Yifan Dong
Summary: LiFePO4 as a cathode material for lithium-ion batteries shows great potential with high theoretical capacity and safety features. However, its future development is limited by low conductivity and diffusion rate. By utilizing a three-dimensional carbon-coated structure, LiFePO4 can achieve higher capacity, enhanced conductivity, and faster electron transport channels without the need for additional carbon sources during synthesis.
Article
Chemistry, Physical
Wenhan Xu, Yanwei Li, Jinhuan Yao, Shunhua Xiao, Botian Liu
Summary: A LiFePO4/rGO composite is synthesized using the leaching liquor of jarosite residue as the Fe source. The composite shows excellent cycling stability, rate capability, and kinetics as a cathode material for lithium-ion batteries. This work realizes the high-value utilization of Fe resources in jarosite residue and the low-cost preparation of LiFePO4 cathode material for LIBs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Environmental
Xiangping Chen, Shuzhen Li, Yi Wang, Youzhou Jiang, Xiao Tan, Weijiang Han, Shubin Wang
Summary: This study successfully applied ultrasound-assisted Fenton reaction to selectively remove PVDF binders from spent LIBs, recovering LiFePO4 cathode materials. Experimental results showed that under optimized conditions, about 97% of the cathode materials can be scrubbed from the aluminum foils, and the cleaned materials are free from contamination.
Article
Biochemistry & Molecular Biology
Hechen Li, Yiwen Guo, Yuanhua Chen, Nengshuang Gao, Ruicong Sun, Yachun Lu, Quanqi Chen
Summary: The full-concentration gradient LiNi0.9Co0.083Mn0.017O2 (CG-LNCM) was prepared and compared to concentration-constant LiNi0.9Co0.083Mn0.017O2 (CC-LNCM) in terms of electrochemical performance. CG-LNCM exhibited lower cation mixing and larger Li+ diffusion coefficients, leading to higher capacity and better rate capability and cyclability compared to CC-LNCM. The significantly improved electrochemical performance of CG-LNCM is attributed to its concentration-gradient microstructure and the composition distribution of concentration-gradient LiNi0.9Co0.083Mn0.017O2.
Article
Chemistry, Physical
M. G. Moustafa, Moustafa M. S. Sanad
Summary: The ZnAl2O4-coated LiFePO4 electrode prepared via polypropylene glycol-assisted sol-gel method showed improved crystallinity, stability, and electrochemical performance, making it a promising cathode material for future development.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Jie Sheng, Jingshan He, Dun Ma, Yuanbo Wang, Wu Shao, Tian Ding, Ronghao Cen, Jingwen He, Zhihao Deng, Wenjun Wu
Summary: This study presents an innovative approach to improve the photovoltaic conversion characteristics and stability of perovskite solar cells through carbon electrode interface modification. By in-situ polymerization and carbonization on the surface of nano-graphite, a dendritic structure carbon electrode is formed, reducing the work function and aligning the energy levels with perovskite. This leads to improved charge and hole collection efficiency, resulting in increased photovoltaic conversion efficiency. Furthermore, the modified carbon electrode-based perovskite solar cells exhibit exceptional stability, maintaining high efficiency even without encapsulation.
Article
Chemistry, Physical
Guodong Shi, Jian Song, Xiaoxiao Tian, Tongtong Liu, Zhanjun Wu
Summary: This study demonstrates the improvement of mechanical properties and reduction of coefficient of thermal expansion (CTE) in graphene oxide (GO)/epoxy (EP) nanocomposites by enhancing the interface between GO and EP through functionalization and incorporating rigid-flexible interphases. The results reveal that the SiO2-PEA-GO hybrid exhibits better strengthening and toughening effects, as well as lower CTE, compared to the PEA-GO hybrid due to the presence of rigid-flexible interfaces with higher bonding strength and better energy dissipation mechanisms. Additionally, the nanocomposites with longer polyetheramine (PEA) molecules in the rigid-flexible interphases demonstrate higher strength and toughness, while maintaining a lower CTE. This work provides a promising strategy for constructing adjustable flexible-rigid interfacial structures and offers potential in developing GO/EP nanocomposites with high mechanical properties and low CTE.
Article
Chemistry, Physical
Rafal Janus, Sebastian Jarczewski, Jacek Jagiello, Piotr Natkanski, Mariusz Wadrzyk, Marek Lewandowski, Marek Michalik, Piotr Kustrowski
Summary: In this study, a facile procedure for the synthesis of CMK-1 and CMK-2 carbon replicas was developed. The method utilizes basic laboratory equipment and a renewable carbon source, and operates under mild conditions. The resulting carbon mesostructures exhibit exquisite replication fidelity and structural homogeneity, making them suitable for applications in various fields.
Article
Chemistry, Physical
Anqi Wang, Connor J. MacRobbie, Alex Baranovsky, Jean-Pierre Hickey, John Z. Wen
Summary: In this study, a novel polymer-free nanothermite aerogel with a wide range of nanoparticle loading was fabricated via a new additive manufacturing process. The SEM images showed a unique porous structure formed by extra thin rGO sheets, wrapping individual nanothermite clusters. The DSC-TGA results and high-speed combustion videos confirmed the enhanced energetic performance of the printed specimen.
Article
Chemistry, Physical
Wanze Wu, Misheng Zhao, Shiwei Miao, Xiaoyan Li, Yongzhong Wu, Xiao Gong, Hangxiang Wang
Summary: Superhydrophobic solar-driven interfacial evaporator is an energy-efficient technology for seawater desalination, which is easily fabricated using robust photothermal superhydrophobic coating and substrate. The created bifunctional coating on the melamine sponge substrate shows stable and highly efficient photothermal and superhydrophobic performance for seawater desalination. This superhydrophobic solar-driven interfacial evaporator is expected to have wide applications in seawater desalination.
Article
Chemistry, Physical
Zichen Xiang, Zhi Song, Tiansheng Wang, Menghang Feng, Yijing Zhao, Qitu Zhang, Yi Hou, Lixi Wang
Summary: This study presents a co-electrospinning synthesis strategy to fabricate lightweight and porous Co@C composite nanofibres with wideband microwave attenuation capacity. The addition of MOF-derived Co additives enhances the low-frequency absorption performance.
Article
Chemistry, Physical
J. Snow, C. Olson, E. Torres, K. Shirley, E. Cazalas
Summary: This study investigates the use of a perovskite-based graphene field effect transistor (P-GFET) device for X-ray detection. The sensitivity and responsivity of the device were found to be influenced by factors such as X-ray tube voltage, current, and source-drain voltage. Simulation experiments were conducted to determine the dose rate and energy incident on the device during irradiation.
Article
Chemistry, Physical
Zuzana Jankovska, Lenka Matejova, Jonas Tokarsky, Pavlina Peikertova, Milan Dopita, Karolina Gorzolkova, Dominika Habermannova, Michal Vastyl, Jakub Belik
Summary: This study provides new insights into microwave-assisted pyrolysis of scrap tyres, demonstrating that it can produce microporous carbon black with potential application in xylene adsorption. Compared to conventional pyrolysis, microwave pyrolysis requires less time and energy while maintaining similar adsorption capacity.
Article
Chemistry, Physical
Max Bommert, Bruno Schuler, Carlo A. Pignedoli, Roland Widmer, Oliver Groning
Summary: A detailed understanding of the interaction between molecules and two-dimensional materials is crucial for incorporating functional molecular films into next-generation 2D material-organic hybrid devices. This study compares the energy level alignment of different-sized fullerenes on a Moire superstructure and finds that C-84 fullerenes can be either neutral or negatively charged depending on slight variations of the electrostatic potential. This discovery suggests a new path to achieve ambipolar charge transfer without overcoming the electronic gap of fullerenes.
Article
Chemistry, Physical
Yuanjing Cheng, Xianxian Sun, Ye Yuan, Shuang Yang, Yuanhao Ning, Dan Wang, Weilong Yin, Yibin Li
Summary: The dual-structure aerogel (GS) consisting of flexible silica fibers and graphene honeycomb structures exhibits excellent resilience, flexibility, and reliability. It also shows remarkable wave absorbing performance, making it an ideal candidate for microwave absorption applications such as flexible electronics and aerospace.
Article
Chemistry, Physical
Shuyu Fan, Yinong Chen, Shu Xiao, Kejun Shi, Xinyu Meng, Songsheng Lin, Fenghua Su, Yifan Su, Paul K. Chu
Summary: Graphene coatings are promising solid lubrication materials due to their mechanical properties. This study presents a new method for in situ deposition of high-quality graphene coatings on hard substrates using NiCo solid solution and competitive reaction strategies. The graphene coating deposited on substrates with deep NiCo solid solution demonstrates superior low-friction and durability.
Article
Chemistry, Physical
Mengdi Wang, Sanyin Qu, Yanling Chen, Qin Yao, Lidong Chen
Summary: The improved thermoelectric properties of conducting polymers are achieved by selectively capturing single-walled carbon nanotubes (SWNTs) in a conducting polymer film, leading to increased carrier mobility and reduced thermal conductivity. The resulting composite film exhibits significantly higher electrical conductivity and lower thermal conductivity compared to films with a mixture of SWNTs. This work provides a convenient and efficient method to enhance the thermoelectric properties of conducting polymers.
Review
Chemistry, Physical
Heng Wei, Weihua Li, Kareem Bachagha
Summary: This article reviews the research progress of carbon nanotube-based microwave absorbing materials (MAMs) in recent years, covering the fundamental theory, design strategies, synthesis methods, and future development directions.
Article
Chemistry, Physical
Chenguang Shi, Junlong Huang, Zongheng Cen, Tan Yi, Shaohong Liu, Ruowen Fu
Summary: This study developed a high-performance Li metal host material, which achieved dendrite-free Li deposition with a low nucleation overpotential and high Coulombic efficiencies through the combination of Ti3C2-g-PV4P sheets and Ag nanoparticles. The full cells assembled with the Li@host anode and LiFePO4 cathode exhibited high discharge capacity and excellent cycling stability, demonstrating a perspective design for future energy storage devices.
Article
Chemistry, Physical
Tomotaro Mae, Kentaro Kaneko, Hiroki Sakurai, Suguru Noda
Summary: A new partial prelithiation method for SiO/C-CNT electrodes was developed, which showed reduced irreversible capacity and achieved high energy densities with good reversibility. The method allows for precise control of the degree of prelithiation and is applicable to various chemistries.