Journal of Materials Chemistry A
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2021
·Vol. 9
·期 15
·9593-9601
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IF 12.732
Yan Zhao,Meng Zhang,Hong Yan,Yu Feng,Xinyu Zhang,Ruijie Guo
Since the original discovery, MXene can be synthesized by wet-chemical etching from the MAX phase. To avoid the shortcomings of the previous etchant, NaHF2 aqueous solution was used for the selective removal of Al from Ti3AlC2, while intercalating Na+ between layers. The d-spacing of the resulting accordion-like Ti3C2Tx is up to 12.35 Å; the by-product Na3AlF6 can be removed by H2SO4, and the product yield can reach about 85%. After a short time of centrifugation and sonication, few-layer (10–20 layers) Ti3C2Tx sheets in a large lateral size (3–4 μm) can be prepared, with high conductivity up to 2.3 × 105 S m−1. Ti3C2Tx can be stably dispersed in water and organic solvents for at least 96 h, and has excellent anti-thermal-oxidation ability. As the anode for sodium ion batteries, the Ti3C2Tx electrode delivers a high reversible capacity of 70 mA h g−1 after 900 cycles at a current density of 1 A g−1 with an extremely low-capacity decay rate. From 900 to 1000 cycles, the capacity can even be increased to 130 mA h g−1, and the Coulomb efficiency is close to 100%, showing that MXene can provide a stable structure for the Na+ cycle.
研究领域:
材料科学
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电化学
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储能技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 3
·552-561
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IF 5.6
Cao Kangzhe,Wang Sitian,He Yanan,Ma Jiahui,Yue Ziwei,Liu Huiqiao
Al is considered as a promising lithium-ion battery (LIBs) anode materials owing to its high theoretical capacity and appropriate lithation/de-lithation potential. Unfortunately, its inevitable volume expansion causes the electrode structure instability, leading to poor cyclic stability. What’s worse, the natural Al 2 O 3 layer on commercial Al pellets is always existed as a robust insulating barrier for electrons, which brings the voltage dip and results in low reversible capacity. Herein, this work synthesized core–shell Al@C–Sn pellets for LIBs by a plus-minus strategy. In this proposal, the natural Al 2 O 3 passivation layer is eliminated when annealing the pre-introduced SnCl 2 , meanwhile, polydopamine-derived carbon is introduced as dual functional shell to liberate the fresh Al core from re-oxidization and alleviate the volume swellings. Benefiting from the addition of C–Sn shell and the elimination of the Al 2 O 3 passivation layer, the as-prepared Al@C–Sn pellet electrode exhibits little voltage dip and delivers a reversible capacity of 1018.7 mAh·g −1 at 0.1 A·g −1 and 295.0 mAh·g −1 at 2.0 A·g −1 (after 1000 cycles), respectively. Moreover, its diffusion-controlled capacity is muchly improved compared to those of its counterparts, confirming the well-designed nanostructure contributes to the rapid Li-ion diffusion and further enhances the lithium storage activity.
研究领域:
材料科学
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电化学
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能源存储
·
纳米结构设计
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金属基复合材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Hu Zhang,Jian Yin,Dandan Ouyang,Yu Liu,Ruiyao Wu,Rui Zhang,Ruiqiang Huo,Gaixiu Yang,Yanjun Cai,Jiao Yin
The plateau capacity of a hard carbon anode plays a crucial role in achieving the high energy density of sodium-ion batteries. However, the loss of plateau capacity due to polarization at high current densities imposes significant limitations on hard carbon applications. Ultra-micropores could maintain plateau capacity at high current densities but are generally prepared accompanied by micropores and mesopores that deteriorate the Na-ion storage performance. Herein, a hard carbon with ultra-micropores is prepared by a protonation-mediated strategy using an N, P co-doped biomass precursor. The P dopants favor reducing the interaction between N and C so that the confined volatiles of NH3 could be utilized to create ultra-micropores concentrated at 0.4–0.8 nm. These ultra-micropores enable the hard carbon to deliver a reversible capacity of 386 mA h g−1 at 20 mA g−1, a high plateau capacity of 173 mA h g−1, and an excellent rate capability of 106 mA h g−1 at 2 A g−1. The plateau capacity and rate capability are superior to those of the reported hard carbons. This work provides a new approach for ultra-micropore construction within hard carbons and a new perspective for sodium-ion batteries toward high energy and power densities.
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
CHINESE PHYSICS LETTERS
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2021
·Vol. 38
·期 6
·068201
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IF 1.483
Jiachao Yang,Jian Zou,Chun Luo,Qiwen Ran,Xin Wang,Pengyu Chen,Chuan Hu,Xiaobin Niu,Haining Ji,Liping Wang
FeSO4 has the characteristics of low cost and theoretical high energy density (799 W⋅h⋅kg−1 with a two-electron reaction), which can meet the demand for next-generation lithium-ion batteries. Herein, FeSO4 as a novel high-performance conversion-reaction type cathode is investigated. We use dopamine as a carbon coating source to increase its electronic conductivity. FeSO4@C demonstrates a high reversible specific capacity (512 mA⋅h⋅g−1) and a superior cycling performance (482 mA⋅h⋅g−1 after 250 cycles). In addition, we further study its reaction mechanism. The FeSO4 is converted to Fe and Li2SO4 during lithium ion insertion and the Fe|Li2SO4 grain boundaries further store additional lithium ions. Our findings are valuable in exploring other new conversion-type lithium ion battery cathodes.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 13
·2130-2137
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IF 7.411
Kai Yao,Zhanwei Xu,Zhi Li,Xinyue Liu,Xuetao Shen,Liyun Cao,Jianfeng Huang
Graphical Letting steam do the work : A grain-like MoS 2 is synthesized by sulfiding MoO 3 using a highly concentrated sulfur vapor. MoS 2 grows epitaxially on three lattice planes, giving rise to particulate MoS 2 coated with MoS 2 nanosheet. Such an architecture gives rise to good dispersity and sufficient distance between neighbors to accommodate the volume change associated with sodiation/desodiation and exhibits a high and stable capacity when used in a sodium-ion battery. MoS 2 is a promising anode material for sodium-ion batteries (SIBs) due to its attractive theoretical capacity and low cost. MoS 2 generally presents a sheet-like structure based on its (002) lattice plane; however, such a structure tends to result in agglomeration and stacking of the sheets that cannot accommodate volume expansion, resulting in poor cyclability. Herein, grain-like MoS 2 particulates (G-MoS 2 ) are synthesized by sulfiding MoO 3 in highly concentrated sulfur vapor, which results in epitaxial growth of MoS 2 in (002), (100), and (110) lattice planes, with the product consisting of MoS 2 particulates of about 300 nm coated with few-layered MoS 2 nanosheets. The unique G-MoS 2 architecture ensures good dispersion and sufficient distance to accommodate volume expansion during sodiation/desodiation, which effectively prevents stacking of MoS 2 , maintaining structural stability. When employed as the working electrode for SIB, G-MoS 2 delivers a high reversible capacity of 324 mAh g −1 at 0.5 A g −1 , retaining 312 mAh g −1 over 300 cycles with an average coulombic efficiency of 99.8 %. Even when G-MoS 2 is cycled at a high current density (2.0 A g −1 ), the retained capacity is 175 mAh g −1 after 400 cycles. Comparison with literature reveals that these capacities are among the more promising reversible values reported for pure MoS 2 .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 44
·23035-23042
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IF 8.867
Mingbao Huang,Caihong Chen,Songping Wu,Xiaodong Tian
Herein, a novel and efficient strategy was established to synthesize few-layer graphene-anchored Fe3O4 nanocomposites (FLG-anchored Fe3O4) through a facile ball-milling route followed by annealing treatment. The as-prepared FLG-anchored Fe3O4 nanocomposites, as an anode material of LIBs, presented remarkable electrochemical performances at a high temperature of 85 °C, i.e., an excellent reversible capacity of 1413 mA h g−1 at a current density of 1.0 A g−1 after 100 cycles and an impressive rate performance of 768 mA h g−1 at a large current density of 5.0 A g−1 even after 100 cycles. These superior performances can be considered as a comprehensive consequence of the following factors: (1) the robust anchor between in situ synthesized Fe3O4 nanoparticles and few-layer graphene via a Fe–O–C linkage maintains structural integrity, enabling excellent cycling stability even at high temperatures; (2) accelerated dynamic diffusion of Li+ ions during lithiation/delithiation at 85 °C leads to a decreased polarization effect, producing enhanced reversibility; (3) enhanced pseudocapacitive behaviour at high temperatures holds partial capacity contribution. Due to these attributes, this material is a reliable and promising candidate for an anode material for heavy-duty Li-ion batteries that operate under harsh environments.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Han Wang,Bingzhe Jia,Zhilin Zhao,Chunyan Luo,Xinming Wu
Two-dimensional (2D) materials used in potassium ion batteries (PIBs) have high theoretical capacitance and excellent rate characteristics. However, the origin of low diffusion of potassium ions and poor storage kinetics still remain challenge mainly due to the large size of potassium ions (0.138 nm) and narrow 2D interlayer spacing. Herein, the V 2 CT x -based hybrids including 1T-MoS 2 (1T -MoS 2 @V 2 CT x ) has been successfully constructed by the magneto-hydrothermal method and proved to be an eminent anode, which can make PIBs have high reversible capacity and eminent rate performance at the same time. Moreover, the combination of 2D 1T-MoS 2 and V 2 CT x not only significantly promotes the transfer of interfacial charges as well as accelerates the transmission and diffusion of electrons and K + , but also helps to alleviate the volume changes caused by the insertion/extraction of large-sized K + during the cycle, which makes the electrode exhibit good cycle stability. Density functional theory (DFT) indicates that the synergy effect between 1T-MoS 2 and V 2 CT x has significantly strengthened the potassium affinities and ion diffusion kinetics in the 1T-MoS 2 @V 2 CT x anode by reducing the ion diffusion energy barrier, thereby showing outstanding K + storage performance, especially in 1T-MoS 2 @V 2 CF 2 . As a result, the 1T-MoS 2 @V 2 CT x anode shows a high reversible capacity of 887.3 mA h g −1 at 0.1 A g −1 , eminent rate performance of the capacity maintaining 563.6 mA h g −1 at 2.0 A g −1 and remarkable cycle stability of 601.2/374.7 mA h g −1 with 69.4/56.5% capacity retention after 2000 cycles at 1.0/2.0 A g −1 . This work provides a new way for the exquisite design of 2D composite electrodes with excellent performance in PIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 44
·17988-17997
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IF 5.101
Yi Lu,Jiang-ping Tu,Chang-dong Gu,Xiu-li Wang,Scott X. Mao
Nickel phosphide (Ni2P) hollow spheres were facilely prepared via an organic-phase strategy using nickel(II) acetylacetonate as a metal precursor, trioctylphosphine as a phosphorus source, and octyl ether as solvent. A core/shell-structured Ni2P@C nanocomposite was grown in situ by employing oleylamine and 1-octadecene as capping agent and solvent, respectively, and the hollow Ni2P spheres were homogeneously wrapped by an amorphous carbon shell. The reversible capacity of the Ni2P@C nanocomposite after 50 cycles is 435 mAh g−1 at 0.1 C and 303 mAh g−1 at 0.5 C, respectively, much higher than that of Ni2P (184.2 mAh g−1 at 0.1 C and 123 mAh g−1 at 0.5 C). These improvements are attributed to the carbon shell, which can enhance the conductivity of Ni2P, suppress the aggregation of active particles, and increase their structure stability during cycling.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·733-742
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IF 5.693
Huang Jinping,Chen Qing,Chen Shuaifeng,Luo Lijie,Li Jianbao,Lin Chunfu,Chen Yongjun
FeNb 11 O 29 has a high theoretical capacity as a potential anode material for lithium-ion batteries; however, the practical capacity of FeNb 11 O 29 reported was unsatisfactory. In this study, a simple and efficient Al 3+ -doping technique was demonstrated to improve the electrochemical performance of FeNb 11 O 29 successfully. The influences of the Al 3+ doping amount were investigated. It was found that the crystal structure of FeNb 11 O 29 could be preserved when a suitable amount of Al 3+ was added, and that Al 0.2 Fe 0.8 Nb 11 O 29 demonstrated better electrochemical performance than FeNb 11 O 29 because the structure of Al 0.2 Fe 0.8 Nb 11 O 29 is more stable. At 0.1C, Al 0.2 Fe 0.8 Nb 11 O 29 possessed a high reversible capacity of 318 mAh g −1 with an initial-cycle Coulombic efficiency of 95.0%. Al 0.2 Fe 0.8 Nb 11 O 29 exhibited outstanding cycling stability with capacity retention of 92.9% at 10C over after 1000 cycles. Moreover, A LiFePO 4 /Al 0.2 Fe 0.8 Nb 11 O 29 full cell was prepared successfully with a discharge capacity of 206 mAh g −1 . The full cell exhibited good cycling stability showing the capacity retention of 84.2% over after 200 cycles at 1C and 89.8% over after 1000 cycles at 5C, respectively. This work suggests that Al 0.2 Fe 0.8 Nb 11 O 29 has great application prospects in lithium-ion batteries. Graphical abstract A suitable amount of Al 3+ doping in FeNb 11 O 29 significantly improves the electrochemical performance (especially the reversible capacity) of FeNb 11 O 29 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Zhi-Hao Zhao,Xu-Dong Hu,Hongqiang Wang,Meng-Yang Ye,Zhi-Yuan Sang,Hui-Ming Ji,Xiao-Lei Li,Yejing Dai
Rational design of electrode materials for sodium-ion batteries with high flexibility is still challenging. Here, superelastic 3D few-layer MoS 2 /carbon framework heterogeneous electrodes (abbreviated as, MoS 2 @C F ) are fabricated by a simple vacuum infiltration and heating process. The interconnected ultrathin MoS 2 network filled with carbon framework forms a 3D heterogeneous network with hierarchical pore structure . The unique structure of the electrodes results in excellent mechanical and electrochemical performances. The MoS 2 @C F electrodes exhibit superior elasticity and recoverability. After 180° bending repeatedly, the electrodes still can recover their initial sizes. Moreover, the electrodes show outstanding cycling stabilities with high reversible capacities reaching up 240 mA h g −1 after 500 cycles at 1 A g −1 (capacity retention of ~ 99%). Full-cells assembled with MoS 2 @C F anodes and Na 3 V 2 (PO 4 ) 3 cathodes show high reversible capacity (~ 252 mA h g −1 at 0.5 A g −1 ). Overall, the superior mechanical properties and high electrochemical performances indicate the promising potential of MoS 2 @C F electrodes in large-scale flexible sodium-ion storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 7
·期 3
·631-641
·
IF 3.975
Wei Nie,Xiaolin Liu,Qingmei Xiao,Liuxin Li,Guoxin Chen,Dong Li,Min Zeng,Shengwen Zhong
Graphical Upcycling rice husks : Hard carbon materials derived from rice husks with hierarchical porous and high specific surface area structures were successfully prepared by a low-cost carbonization approach. The hard carbon material synthesized at 800 °C was exploited as an anode material for sodium-ion batteries, which results in promising enhancement in all electrochemical parameters. This work represents a promising technology for low-cost and high stable sodium-ion storage. Compared with the cathode materials, the research on the anode materials of the sodium-ion batteries has lagged behind. Therefore, development of the anode materials with high capacity, long life, and excellent rate properties is the key to unlocking the practical application for sodium-ion batteries. This study presents the preparation of hierarchical porous hard carbon as an active anode material from rice husks. The as-synthesized materials are characterized by X-ray diffraction, N 2 adsorption, Raman spectra, scanning electron microscopy and transmission electron microscopy. These porous hard carbon materials exhibit a high specific surface area and are promising for reversible sodium storage. Galvanostatic studies show that the specific initial capacities of all samples were in the range of 130–300 mA h g −1 at a current density of 100 mA g −1 between 0.01 V and 2.3 V. Compared to the other samples, the hard carbon materials prepared at 800 °C from rice husk (RHPC-800) can deliver a high reversible capacity of 274 mA h g −1 at a current density of 25 mA g −1 , maintain a capacity of approximately 260 mA h g −1 , and retain 92.7 % of its capacity after 500 cycles. This excellent electrochemical performance of the as-prepared RHPC-800 material is attributed to the high specific surface area and low charge transfer resistance.
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
ChemSusChem
·
2022
·Vol. 15
·期 8
·e202200063
·
IF 9.14
Qing Ji,Xiaoping Chen,Ya-Jun Cheng,Qingyu Dong,Yanbin Shen,Zhaohui Yang,Binjie Hu,Yonggao Xia
Graphical Carbon, the master : Constructed with unique carbon emcoating structure through CO 2 acivation, NbO 2 benefited from an effective and highly conductive carbon network, giving rise to exceptional electrochemical performances in terms of reversible capacities, rate capability, and cyclic stability. As a promising alternative as lithium-ion anode, niobium dioxide appeals to researchers due to high theoretical capacity and good electron conductivity. However, rarely work about NbO 2 based high performance anode is reported. Here, NbO 2 nanoparticles emcoated in continuous carbon matrix is constructed through CO 2 /H 2 coupling treatment. CO 2 activation introduces unique carbon emcoating structure, which builds interconnected electron conductive network with low carbon content. Furthermore, crystallographic phase of NbO 2 is enhanced during H 2 treatment, which increases the lithium storage ability. Electrochemical performance of NbO 2 anodes is significantly improved based on the carbon emcoating structure. A high reversible capacity of 391 mAh g −1 is retained after 350 cycles at 0.2 C. Additionally, at a current density of 1 A g −1 , the reversible capacity reaches 139 mAh g −1 . Compared with conventional NbO 2 /C nanohybrids, the lithium diffusion coefficient of carbon-emcoated sample shows improvement of three orders of magnitude. Moreover, the in situ XRD investigation shows a reversible lithium insertion behaviour with a limited volume change.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）