SOLID STATE IONICS
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2021
·
IF 3.785
Dong Feng,Siyu Hao,Qi Liu,Yuanzhi Zhu,Tianbiao Zeng
Among germanium-based composites, GeS 2 has attracted increasing concerns owning to its high theoretical capacity when applied to lithium-ion batteries (LiBs) as anode materials . Nevertheless, the intrinsic poor conductivity and volume expansion issues of GeS 2 hindered its practical applications. Herein, we report a ball milling-assisted solid-state reaction approach to simultaneously smash GeS 2 particles and exfoliate graphite powder . In this way, the GeS 2 was pulverized and well anchored in exfoliated graphite sheets. When used as anode electrode for LiBs, the graphite sheets not only served as electron transfer layers, but also helped alleviating the volume shrinkage/expansion of GeS 2 during the repeated lithiation/de-lithiation processes. The well designed GeS 2 -coated graphite sheet structure endow the hybrid GeS 2 /graphite (GeS 2 /C) anode with high reversible capacity. For instance, the GeS 2 /C anode powder delivered specific capacities of 823.3 and 395.3 mAh g -1 at 100 th and 200 th cycle under 0.1 and 1.5 A g -1 , respectively, these values were higher than that of the neat GeS 2 anode (corresponding to 453.1 and 81.0 mAh g -1 ). This study offers a facile and economical strategy to settle the drawbacks of GeS 2 for LiBs anode, which shed some light on guiding the preparation of various types of graphite-supported electrodes with improved integral electrochemical performance .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Dong Feng,Qi Liu,Zhongming Li,Tianbiao Zeng
As anode materials for lithium-ion batteries (LiBs), GeS2 has attracted considerable attention owing to its high theoretical capacity. Nevertheless, pulverization of GeS2 during the lithiation/delithiation process impedes its practical applications. Hybrid cross-linking with the second phase material is an effective strategy to improve the charge/discharge cycling performance. Herein, a high-capacity, long cycle-life nano-GeS2/carbon (GeS2/C) composite was facilely synthesized via the solid-state ball milling reaction. GeS2/C was then used to construct the three-dimensional (3D) flexible electrode. In this way, the flexible electrode with nano-GeS2/C particles confining in porous carbon networks exhibited improved reversible capacity and cycling performance, thanks to the unique confinement cellular structure. For instance, the flexible electrode with ∼500 μm thickness delivered capacities of ∼991, ∼888, ∼737, and ∼604 mA h g–1 at 0.1, 0.2, 0.5, and 1 A g–1, respectively. Upon stacking into two layers of the GeS2/C flexible electrode, the increased thickness displayed no effects on its diffuse-controlled capacity ratio and Li+ diffusion coefficient. This work provides a new strategy to stabilize germanium chalcogenides for LiB anodes with enhanced performance and sheds light on the preparation of other types of 3D flexible electrodes.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Lei Ming,Yun Yu,Shaojun Fang,Zhiming Xiao,Xing Ou
Transition metal dichalcogenides exhibit tremendous potential for sodium ion batteries (SIBs), owing to the outstanding specific capacity and aboundant reserves. However, the large ionic radius of sodium and poor conductivity often result in the fast decaying performance and inferior reaction kinetics. Herein, the GeS 2 /GeO 2 /ZnS@rGO (GGZ/C) ternary metal-based composite is fabricated as an anode material for SIBs. Notably, the GGZ/C composite is derived from the phase transformation of Zn 2 GeO 4 precursor, which is beneficial for the heterostructure engineering. In this hierarchical structure, the metal phases ZnS and GeO 2 are used to form the heterogeneous framework, while graphene is applied to build a conductive network and anchor the host nanoparticles . Therefore, the great Na + diffusion channels are achieved by the rational design of the huge exquisite interfaces among the heterogeneous mixed phases. Notably, it can almost completely relieve the volume expansion and restrain the internal stress of GGZ/C composite, providing the excellent structural tolerance. As expected, the GGZ/C composite exhibits excellent rate capability, with an impressive reversible capacity of 548 mAh g −1 at a high rate of 5.0 A g −1 . Meanwhile, the GGZ/C also displays outstanding cycling performance with a specific capacity of 519 mAh g −1 after 650 cycles at high rate of 5.0 A g −1 . This strategy offers the inspiration for rational heterostructure engineering for the energy storage materials with excellent reversible capacity and large volume variation.
研究领域:
材料科学
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储能
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电化学
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纳米材料
✓ 已验证
DOI
高影响因子
International Journal of Applied Glass Science
·
2015
·Vol. 7
·期 3
·337-344
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IF 2.611
Guang Yang,Fang Xia,Xiaoyan He,Jianfeng Wen,Guorong Chen
Effects of Pb on thermal stability and crystallization kinetics of chalcogenide glasses (1− x )(0.85GeS 2 −0.15Sb 2 S 3 )− x PbS ( x = 0–0.4) have been carried out by a detailed calorimetric study and structural analysis. The glass stability was assessed based on three criteria, while the activation energies of crystallization were calculated under nonisothermal crystallization conditions by the Kissinger method, the Augis/Bennett method, the Mahadevan method, and the modified Ozawa method, respectively. Both stability criteria and activation energies of crystallization suggest that the glasses possess excellent thermal stability. The thermal stability decreases with addition of PbS but is insensitive to the content of PbS in the range from x = 0.1 to 0.4. Raman, XRD, and molar volume structural characterization suggested that the excellent thermal stability of these glasses is due to the glass former role of PbS. The calculated Avrami exponent pointing to a 3-dimensional crystallization mechanism which explains the reason for the previously reported successful preparation of infrared transmitting chalcogenide glass-ceramics.
研究领域:
材料科学
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玻璃物理
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热分析
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Guocui Xi,Tianbiao Zeng
Germanium sulfide (GeS 2 ) is promising anode material for sodium ion batteries (SIBs) because of its high theoretical capacity, but it usually shows poor long-term cycling performance owing to the large volume change during sodiation/desodiation. In this work, the GeS 2 /C composites were synthesized via a facile solid-state method, and then the three-dimensional flexible electrode (3D-GeS 2 /C electrode) was prepared by freeze-drying and heat treatment after cross-linking the GeS 2 /C with carbon nanotube (CNT). The carbon layer of GeS 2 /C and the CNT network in 3D-GeS 2 /C electrode effectively restrain the volume expansion and enhance the electric conductivity , thus improving the cycling stability of GeS 2 . In consequence, the reversible capacities of 3 3%-GeS 2 /C, 66 %-GeS 2 /C and 75 %-GeS 2 /C can remain at 159.6, 382.2 and 290.2 mAh g −1 at 200th cycle. More importantly, the 3D-GeS 2 /C electrode exhibit a capacity of 266.5 mAh g −1 and the corresponding specific surface capacities of 3.30 mAh cm −2 after 500 cycles. These results probably provide an inspiration for elevating the performance of GeS 2 and fabricating 3D flexible electrode.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Jing Zhang,Huanming Zhuo,Yuehuan Peng,Xuelong Rao,Keyi Xian,Haozhe Qin,Chunhui Wang
Typically, general heterostructure easily generates accumulated interior stress at the interface of heterogeneous phases, which will deteriorate the potassium ion storage performance. Macro-control design improving microstructure stability is a promising construction strategy for obtaining high-performance anode materials. Herein, the spherical framework constituted by numerous nanograins has been fabricated for enhancing the electrochemical performance of the hetero-phase of ZnS combined with GeS 2 (ZGS-SP). Specially, the framework of ZGS-SP materials constituted by nanospheres delivers multiple cross-linked nodes, which can effectively disperse the inner stress, thereof improving the structure stability of primary grains. Meanwhile, due to the presence of the acting and reacting force and surficial carbon, the nanospheres can support each other as the framework structure expands in volume during K-ion insertion, thus heightening the structure tolerance of overall framework. As expected, the ZGS-SP materials express a prominent cycling stability (121.6 mAh g −1 at 1 A g −1 over 1000 cycles).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Haozhe Qin,Bao Zhang,Chunhui Wang,Lei Ming,Xing Ou
Phase engineering for synchronously realizing the demand of electrochemical reactions and structural stability has attracted the great enthusiasm of researchers to obtain high capacity and tolerance for Na+ insertion, especially the construction of uniform heterostructures by regulating the crystal structure in the same phase. Herein, ultrathin GeS2 nanoflakes composed of a mixture of orthorhombic and monoclinic crystal structures have been constructed by employing an in situ Ge-MOF sulfidation method. Benefiting from the combined effect of the accelerated reaction kinetics derived from the self-assembly of heterostructures, and the enhanced reaction reversibility originating from the excellent homogeneity of heterointerfaces and a stable intermediate phase interface, the GS-OM electrode materials show outstanding rate properties (371.9 mA h g–1 at 30 A g–1) and Na+ uptake/removal durability (603.9 mA h g–1 at 10 A g–1 over 1000 cycles) and even deliver an excellent practicability (104.01 mA h g–1 at 1 A g–1 over 300 cycles for full cells). Of note, this constructed phase engineering is expected to provide powerful guidance and effective insight for designing better sodium ion battery anodes with not only superior electrochemical reaction reversibility but also improved structure perdurability.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2017
·
IF 2.124
Quan Guo,Yantao Xu,Haitao Guo,Xusheng Xiao,Changgui Lin,Xiaoxia Cui,Pengfei Wang,Fei Gao,Min Lu,Bo Peng
A serial (100 − x)Ge 25 Sb 10 S 65 -xI (x = 0, 5, 10, 15, 20, 25 and 30 wt%) chalcohalide glasses and ones doped with 0.1 wt% Dy 3 + rare-earth ions were synthesized and their structural, thermal and optical properties were systematically studied. It indicates that addition of I 2 into Ge 25 Sb 10 S 65 glass significantly decreases the connectivity of glass network and average bond energy, and modifies the associated properties. The glass transition temperature and refractive index decrease monotonically, and the density increases almost linearly with the increasing of iodine content in glass. The thermal stability is improved, which has a maximum of ΔT max = 174 °C. While the optical bandgap has a peak value at x = 10 wt%. The absorption spectra and mid-infrared fluorescence spectra of Dy 3 + rare-earth ions doped glasses were investigated together with the Judd-Ofelt analysis. GeS 2 nano-crystals were found in the sample with x ≥ 15 wt%, which is supposed to induce enhancements of mid-infrared fluorescence at 2.95 and 4.32 μm.
研究领域:
材料科学
·
光学
·
固体物理学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）