INORGANIC CHEMISTRY
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2024
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IF 4.3
Linfeng Dong,Bohui Xu,Deshuai Xiao,Fan Liu,Xinyuan Zhang,Xuanlin Pan,Pifu Gong,Zheshuai Lin
Optoelectronic materials with excellent birefringent properties are of significant importance in the fields of optical communications and laser technology. Recently, rare earth (RE) chalcogenides with anisotropic [RESn] groups have been proven to be high-performance infrared birefringent materials. Herein, we demonstrate that the addition of planar groups can further increase the birefringence in RE chalcogenides, as realized by incorporating planar [AgS3] groups into the RE-I-IV-S4 family for the first time. The newly obtained LaAgSiS4 compound shows higher polarity anisotropy than its homologue LaLiSiS4 and LaKSiS4, which resulted in a larger birefringence (0.12@600 nm) at least twice as large as that of the latter two compounds (0.05/0.06@600 nm). The structure–property relationship of LaAgSiS4 was investigated through structural analysis and first-principles calculations. The results indicate that the increased optical birefringence in LaAgSiS4 originates from the synergic effects of the distorted [LaSn] polyhedra and planar [AgS3] triangles. This work provides an effective strategy for enhancing optical birefringence in IR chalcogenides.
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Materials Today Communications
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2024
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IF 3.7
Hao Chen,Jianjun Chen,Yongwei Lou,Mingming Zhu,Jinxia Li,Jiahao Yang,Hussain Zaheer
SiC nanowire paper composed of SiC nanowires, possesses extensive industrial applications owing to its remarkable properties of low thermal conductivity , fire resistance and foldability. In this work, centimeter-scale SiC nanowires were successfully synthesized via a sol-gel and carbothermal reduction reaction. Subsequently, the simple and convenient traditional handcraft paper-making process enables the non-oriented intertwining of nanowires, forming a paper-like structure. Experimental results show that the thermal conductivity of silicon carbide nanowire paper with a thickness of 0.7 mm is 0.041 W/m∙K at room temperature, which is far lower than that of the traditional porous ceramics because of its nanoporous structure. Moreover, upon heating the nanowire paper to 300 °C, a significant temperature difference of approximately 150 °C was observed between its front and back surfaces, and it was able to withstand the butane flame (∼1300 °C) heat treatment for a long time, which indicated that the nanowire paper had obvious low thermal conductivity, good thermal insulation and refractory properties. These characteristics ensure the promising application of SiC nanowire paper for thermal insulation and fire resistance applications.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yanlin Zhang,Dafang He,Junhong Lu,Jie Huang,Haoyang Jiang,Junfeng Rong,Guolin Hou,Haiqun Chen
Silicon (Si) is regarded as the most promising anode candidate for the next high energy density lithium ion batteries (LIBs) owing to its highest theoretical specific capacity and low lithiation potential. However, the practical application of Si-based materials is severely limited due to their enormous volume expansion, which leads to the breakdown of the electrode structure and shortens the cycle life. Herein, we successfully fabricated a free-standing graphene encapsulated silicon nanospheres (Si/rGO) film through homogenizing nano-Si in the lyotropic liquid crystallinity of graphene oxide (GO), followed by coating on the PET substrate and hot pressing technology. For the first time during the preparation process, the dispersion of nano-Si in deionized water was quantitatively characterized through real-time measurements of zeta potential and average particle size. Benefiting from the highly ordered layer-to-layer stacking and dense framework, the as-prepared Si/rGO film shows a high initial discharge capacity of 1727.2 mAh/g at 200 mA/g and superior cycling stability (1024.2 mAh/g over 200 cycles). This straightforward and easy-to-implement method can be used for industrial-scale production through continuous feeding.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yuxiu Yu,Qiang Zhang,Na Teng,Yaodong Liu
Silicon is widely recognized as an exceptionally auspicious anode material for lithium−ion batteries due to its remarkable specific capacity, suitable operational potential, and ecologically innocuous characteristics. This study presents a novel silicon@void@FC (fibrous carbon) composite anode material for lithium-ion batteries. Utilizing a one-step synthesis approach, the resulting hollow core–shell structure, combined with a mesoporous carbon shell, demonstrates exceptional electrochemical performance . The Si@Void@FC electrode exhibits remarkable cycle stability and rate performance, maintaining structural integrity over 500 cycles without observable degradation. The outer carbon shell acts as a protective layer and accommodates silicon volume expansion during cycling, preventing excessive contact with the electrolyte. The rich mesoporous structure facilitates efficient lithium-ion diffusion, enhancing lithiation and delithiation processes. The simplified one-step synthesis method further streamlines the preparation process, eliminating the need for complete silica template formation. This innovative Si@Void@FC composite material holds promise for advancing lithium-ion battery technology, addressing challenges associated with silicon-based anode materials, and offering insights into the design and synthesis of high-performance energy storage materials .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Hui Zhang,Jiatong Li,Yajun Zhu,Xiangbing Zeng,Chengbing Chen,Huigang Zhang,Jinyun Liu
Large theoretical capacity silicon (Si) anode for lithium-ion (Li-ion) battery is hindered by its large volumetric change and structural collapse during cycling. Here, we report a strategy that in-situ embedding Si nanoparticles (Si NPs) into flower-like selenides, then coating with carbon layer, forming a Si@ZnSe/CoSe@C anode. Engineered frame structure provides an optimized condition for alleviating volumetric of Si, and thereby improving stability. Additionally, carbon layer not only immobilize Si NPs, but also improves the conductivity. The Si@ZnSe/CoSe@C anode shows a capacity of 563 mAh g −1 after 150 cycles at 0.1 A g −1 , and a Coulombic efficiency as high as 99.4 % after cycling 800 times at 0.2 A g −1 . A 50 °C-tolerable performance is also obtained, showing a potential for applications. We believe that the composite design presented here offers a general method for developing high-performance energy-storage materials even though they intrinsically have large-volumetric change and low conductivity.
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JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Haiyan Guo,Lingbin Liu,Yuxiu Yu,Qiang Zhang,Qing Chang,Yaodong Liu
Binders play a vital role in silicon-based anode materials. In this study, we design and synthesize a series of silicon-based anode binders by incorporating functional monomers such as Diaminobenzoic acid (DABA), Aminopropyl terminated polydimethylsiloxane (PDMS) and 4,4′-diphenyl ether dianhydride (ODPA) into polyimide (PI) backbones. The goal is to develop binders with a balance of rigidity and flexibility to improve the electrochemical performance of silicon anodes in lithium-ion batteries. It is found that the chemical structure of the binder affects the swelling rate, bond strength and rigidity, which thereby impacts the electrochemical performances of silicon anode. The incorporation of (PDMS) enhances the binder's flexibility, which effectively accommodates the volume expansion of silicon during cycling, thereby improving cycling stability. However, excessive PDMS content leads to increased swelling rates and weakened adhesion, negatively affecting the formation and stability of the solid electrolyte interphase (SEI) layer and reducing first Coulombic efficiency (ICE). The co-polymerization of 1,3-bis(aminopropyl) tetramethyldisiloxane (NH 2 -DS) reduces the binder's solubility, resulting in improved ICE. Among the binders tested, Si@ODPA-NH 2 -DS-DABA exhibits the best cycling performance, has a specific capacity of 1690.2 mAh g −1 after 200 cycles at 0.2 C, due to its optimal rigid-flexible ratio, lower swelling rate, and stronger adhesion to the electrode. The synergistic effect of rigid benzene rings, imide bonds, and flexible ether and Si-O-Si units provide high strength, toughness, and adhesion. This study provides valuable insights into the design of silicon anode binders, demonstrating that a careful balance of binder flexibility, swelling rate, and adhesive strength is essential for achieving superior electrochemical performance and long-term cycling stability.
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Journal of Materials Chemistry A
·
2024
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IF 10.7
Mengyi Li,Baokai Wang,Chang Yu,Mengyang Niu,Kunjie Yuan,Weiwei Xuan,Ming Yue,Lifeng Zhu,Kexin Chen,Qi Wang
With great advancements in foldable electronic devices, there has been growing interest in ultra-light and flexible composite films possessing high in-plane thermal conductivity. One-dimensional (1D) Si3N4 nanowires (Si3N4NWs) possess the advantages of high thermal conductivity, superior mechanical performance and easy to be directionally aligned to construct thermally conductive pathways, which have been considered one of the ideal fillers for preparing anisotropic composite films. However, 1D Si3N4NWs with high aspect ratios tend to aggregate and are difficult to be dispersed in polymer matrixes, while traditional dispersion approaches utilizing prolonged ball milling or strong mechanical mixing easily result in a significant reduction in the length of Si3N4NWs, making it difficult to fully exploit the advantages of high intrinsic thermal conductivity. Therefore, it is highly essential to prepare high-performance composite films without damaging the length of Si3N4NWs. In this study, we propose an innovative strategy for the direct construction of continuous thermally conductive networks composed of ultra-long Si3N4NWs. An entire piece of Si3N4NW paper was successfully synthesized, which was directly used to prepare composite films via a simple vacuum-impregnation combined with hot-pressing method. Since the high aspect ratio of Si3N4NWs was maximally preserved during the composite process, the prepared Si3N4NW/EP composite films exhibited a high in-plane thermal conductivity of 16.02 W m−1 K−1 at a filling fraction of 64.6 wt%. More importantly, the interconnected, ultra-long Si3N4NWs also provide composite films with flexibility and excellent mechanical strength, enabling promising applications in the thermal management of electronic devices.
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Materials
·
2024
·Vol. 17
·期 3
·754
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IF 3.1
Chengyuan Ni,Chengdong Xia,Wenping Liu,Wei Xu,Zhiqiang Shan,Xiaoxu Lei,Haiqing Qin,Zhendong Tao
(Si/graphite)@C and (Si/graphite/graphene)@C were synthesized by coating asphalt-cracked carbon on the surface of a Si-based precursor by spray drying, followed by heat treatment at 1000 °C under vacuum for 2h. The impact of graphene on the performance of silicon–carbon composite-based anode materials for lithium-ion batteries (LIBs) was investigated. Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) images of (Si/graphite/graphene)@C showed that the nano-Si and graphene particles were dispersed on the surface of graphite, and thermogravimetric analysis (TGA) curves indicated that the content of silicon in the (Si/graphite/graphene)@C was 18.91%. More bituminous cracking carbon formed on the surface of the (Si/graphite/graphene)@C due to the large specific surface area of graphene. (Si/Graphite/Graphene)@C delivered first discharge and charge capacities of 860.4 and 782.1 mAh/g, respectively, initial coulombic efficiency (ICE) of 90.9%, and capacity retention of 74.5% after 200 cycles. The addition of graphene effectively improved the cycling performance of the Si-based anode materials, which can be attributed to the reduction of electrochemical polarization due to the good structural stability and high conductivity of graphene.
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International Journal of Applied Ceramic Technology
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2024
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IF 1.8
Ruibin Liu,Yuhong Chen,Zhengxiang Chen,Wanxiu Hai,Meiling Liu
Particle grading is a reliable method to improve mechanical properties of reaction-bonded silicon carbide (RBSC) ceramics. This work aims to explore the effects of particle grading on thermal and mechanical characteristics of RBSC ceramics. Results showed that the powder grading enabled to increase sintering density of silicon carbide (SiC) ceramics. The use of large particle SiC powder in grading led to a 28% increase in thermal conductivity but a 22% decrease in bending strength. Meanwhile, the addition of finer SiC powder exerted minimal effect on thermal conductivity but noticeably increased bending strength by 10%. Therefore, properly adjusting particle size in grading allows for the control of residual Si content and microstructure, thereby simultaneously increasing thermal conductivity and bending strength of the material.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
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IF 4.3
Jianxun Zhao,Wenhao Fan,Wanqiang Liu,Lianshan Sun,Yuhai Wang,Heng Liu,Peng Chen,Qingcheng Liang,Yong Cheng,Xinwei Wang
The Co 0.9 Cu 0.1 Si alloy was prepared using the mechanical alloying method, while CeO 2 and Ni-CeO 2 were synthesized through the hydrothermal method. Various mass ratios of CeO 2 and Ni-CeO 2 were incorporated into the Co 0.9 Cu 0.1 Si alloy via the mechanical alloying process. The electrochemical test results demonstrated a significant enhancement in hydrogen storage performance compared to that of the original Co 0.9 Cu 0.1 Si alloy. In our experiment, the samples with identical doping ratios revealed that the composite material doped with Ni-CeO 2 exhibited superior electrochemical hydrogen storage performance compared to its counterpart solely doped with CeO 2 .When Ni-CeO 2 was doped in the composite material at a ratio of 20:1, the sample demonstrated exceptional electrochemical hydrogen storage performance. At a discharge current of 25 mA/g, the discharge capacity reached 606.7 mAh/g, and after 50 cycles, the capacity retention rate was measured at 63.4%. Furthermore, its corrosion resistance and exchange current density surpassed those of other samples. The multifarious origins underlying these outcomes are rooted in a multitude of factors. Primarily, nickel engenders this phenomenon through its provision of high specific capacitance, exceptional reversibility, and enhanced electrical conductivity. Additionally, the introduction of nickel into the CeO 2 lattice creates vacancies that enhance hydrogen adsorption and facilitate charge transfer processes. Furthermore, CeO 2 and Ni-CeO 2 form the protective layer for the alloy, preventing dissolution of its constituents on the surface while improving resistance against fragmentation and corrosion. The findings of this investigation support the idea that incorporating transition metal oxides doped with metallic impurities into hydrogen storage alloys can improve their electrochemical performance and kinetic attributes, while also strengthening their resistance to corrosive influences.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yanlin Zhang,Junhong Lu,Weizuo Li,Jie Huang,Haoyang Jiang,Ben Liang,Benyuan Wang,Dafang He,Haiqun Chen
Macro-assembled silicon-based films can be taken into account as a possible anode material for the lithium ion batteries (LIBs) in portable electronics. However, most previously proposed preparation strategies are labor-intensive, intricate, and not appropriate for large-scale manufacturing. Herein, a multifunctional flexible silicon/carbon nanotube/reduced graphene oxide (Si/CNT/rGO) film was fabricated by one-step coating method based on the lyotropic nematic liquid crystals of graphene oxide (GO). The composite film’s structure is made up of stacked rGO nanosheets, with nano-Si and CNT interspersed between the layers, resembling a “brick–mortar” pillared configuration. The prepared Si/CNT/rGO film demonstrates an exceptional tensile strength, reaching up to 134 MPa, and manifests commendable lithium storing properties in terms of initial charge capacity (1885 mAh/g at 200 mA/g) and cyclability (1376.4 mAh/g beyond 200 cycles). The straightforward preparation method offers a fresh path to create stable and mechanically robust composite film for advanced engineering applications.
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Small
·
2025
·
IF 12.1
Cheng Li,Yuqi Wu,Fucheng Ren,Jun Liu,Ying Lin,Meng Xia,Huanran Wang,Chunyan Meng,Zhenyu Wang,Zhengliang Gong,Yong Yang
Silicon is widely recognized as a promising anode material for all-solid-state batteries (ASSBs) due to exceptional specific capacity, abundant availability, and environmental sustainability. However, the considerable volume expansion and particle fragmentation of Si during cycling lead to significant performance degradation, limiting its practical application. Herein, the development of a pre-lithiated Si-based composite anode (c-Li 1 Si) is presented, designed to address the key challenges faced by Si-based anodes, namely severe volume changes and low electrochemical stability. The c-Li 1 Si anodes are prepared by incorporating Li₁Si powders with Li 6 PS 5 Cl (LPSCl) sulfide solid electrolyte (SSE), forming a dense structure that enhances conductivity and mitigates structural degradation. The ASSBs with c-Li 1 Si-60 anode exhibit outstanding electrochemical performance, including excellent rate capability and capacity retention of 84.4% after 1000 cycles at 1 C and exceptional performance even at low anode-to-cathode capacity ratios (N/P ratio) of 1.68. EIS and pressure measurements reveal improved reaction kinetics and reduced volume expansion. X-ray micro-CT and SEM further confirmed the introduction of LPSCl effectively alleviated volume changes and maintained electrode structural integrity, contributing to enhanced electrochemical performance. These results underscore the potential of the c-Li 1 Si anode to overcome the intrinsic limitations of Si-based anodes, offering a promising pathway toward high-energy-density ASSBs.
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