MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Mingxuan Zong,Yanjiang Zhang,Jianquan Liang,Xinghai Li,Qi Qi,Kangyi Chen,Li Zhao,Changsong Dai
The recently discovered Na 3 MnTi(PO 4 ) 3 cathode material has an extremely high theoretical capacity, but its poor cycling performance makes it challenging to apply. In this work, a series of NASICON-type Na 3+x MnV x Ti 1-x (PO 4 ) 3 /C (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1) cathode materials were prepared by sol-gel method for sodium-ion batteries. X-ray diffraction (XRD) indicates that vanadium doping has increased the cell spacing within the material and the cell volume. From the results of X-ray photoelectron spectroscopy (XPS) and Energy dispersive X-ray spectroscopy (EDS) mapping images, it is shown that vanadium has been successfully doped into the material. Among them, the Na 3·3 MnV 0·3 Ti 0·7 (PO 4 ) 3 /C delivers an outstanding specific capacity (121.7 mAh g −1 at 0.1C, C = 135 mA g −1 ) and Na 3·4 MnV 0·4 Ti 0·6 (PO 4 ) 3 /C shows an excellent capacity retention (80.88 % after 1500 cycles at 1C). Notably, the coulombic efficiency of both materials during cycling is close to 100 %, indicating that these materials have great practical application value.
研究领域:
材料科学
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电化学
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能源存储
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无机固体化学
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电池技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Que Huang,Rui Du,Xu Yang,Yanwu Yu,Zirui Guo,Guohui Li,Qinpei Chen,Jianghui Xie,Hongyuan Ding,Junchao Zhao,Changcheng Liu
With the increasing depletion of traditional energy resources and the continuous rise in usage costs, the development of new energy storage technologies has become a global focus. Although lithium-ion batteries possess excellent electrochemical performance and a well-established industrial infrastructure, they are prone to thermal runaway and pose significant safety risks. As a potential alternative to lithium, sodium-ion batteries demonstrate promising commercial prospects due to their low cost, similar electrochemical properties, and the fact that they are more resistant to thermal runaway and exhibit less violent reactions. Among the numerous cathode materials for sodium-ion batteries, Na 3 V 2 (PO 4 ) 3 (NVP) has attracted significant attention due to its high energy density, structural stability and excellent thermal safety; however, its inherently low electronic and ionic conductivity limits its practical application. To address this, this study modifies NVP by introducing different transition metal elements to regulate the unit cell volume, broaden the ionic migration pathways, and further enhance its electrochemical performance and thermal safety. Electrochemical test results indicate that the optimal doped sample achieves a half-cell/full-cell capacity of up to 122.3 mAh g −1 ; infrared spectroscopy reveals minimal temperature variation during charge-discharge cycles. Accelerated Calorimetry (ARC), Thermogravimetric Analysis (TG) and Differential Scanning Calorimetry (DSC) tests further confirmed that element doping significantly improves the thermal stability of NVP, increases heat absorption and reduces the risk of thermal runaway. Building on this, a Random Forest (RF) machine learning model was developed to systematically analyze thermal runaway data and predict safety performance under different doping conditions. Model evaluation results indicate that the RF model possesses high predictive accuracy and good generalisation ability, enabling it to effectively identify key features influencing safety. Integrating experimental and modelling results, the combination of transition metal element doping modification and machine learning prediction methods provides a new technical pathway and theoretical basis for the design and feasibility assessment of high-safety sodium-ion batteries. Download: Download high-res image (156KB) Download: Download full-size image
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jun Cong,Shao-hua Luo,Peng-yu Li,Xin Yan,Li-xiong Qian,Sheng-xue Yan
Na 3 V 2 (PO 4 ) 3 (NVP) has become a hot material in the research field of sodium-ion batteries (SIBs) as a result of its unique structural advantages. Unfortunately, the poor electronic conductivity and ion diffusion ability fundamentally limit the practical development of NVP. Considering the above defects, a series of Li + doped Na 3−x Li x V 2 (PO 4 ) 3 /C cathode materials for SIBs are synthesized through hydrothermal assisted sol–gel method. The cell volume steadily decline with the raise of Li + doping amount, which is consistent with the usual doping effect. Moreover, with the increase of lithium doping amount, Li + preferentially occupies Na (2) site and then occupies Na (1) site. Through the first principles calculation, it is clear that the introduction of Li + can significantly reinforce the conductivity of the material system and diminish the electron localization phenomenon. The analysis of (1 1 6) crystal plane by TEM shows that Li doping will reduce the interplanar spacing. The change of V valence during the charge–discharge process of Na 2.8 Li 0.2 V 2 (PO 4 ) 3 /C is consistent with that of NVP by V element XANES characterization. There is no conventional phase transition phenomenon in the ex-situ XRD high-voltage charging state. The above facts indicate that lithium doping obtains a stable solid solution NVP. The electrochemical test results show that Na 2.8 Li 0.2 V 2 (PO 4 ) 3 /C can provide an amazing reversible capacity of 116.9 mAh/g (theoretical capacity of 117 mAh/g) and capacity retention rate of 99.82 % after 500 cycles. GITT results show that Li + can significantly increase the Na + diffusion coefficient of the material. Such excellent electrochemical performance is attributed to the fact that the doping of Li + activates the activity of Na + in Na (2) site and improves the reaction efficiency.
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Jiepeng Chen,Yun Huang,Jiapin liu,Chengwei Li,He Zheng,Xi Xu,Lei Fu,Xing Li,Mingshan Wang,Yuanhua Lin,Haijun Cao
The sodium super ion conductor (NASICON) structure materials have attracted extensive attention because of its open three-dimensional crystal network framework and fast sodium ion migration rate. However, the poor electronic conductivity due to the presence of phosphate groups and the consequent high cost have been a barrier to commercialization. In this work, Na 4 MnV(PO 4 ) 3 (NMVP) with three-dimensional porous structure is synthesized in situ using Aspergillus niger as a biological template (noted as NMVP/ANDC). The cell wall of Aspergillus niger is rich in hydroxyl groups , which can adsorb metal ions well, so that NMVP particles can be synthesized on Aspergillus niger without stacking and agglomeration. NMVP grows along Aspergillus niger mycelium has a spongy-like three-dimensional porous network structure, which helps the contact between active materials and electrolyte, reduces the migration distance of sodium ions, and improves the conductivity of active materials. Therefore, NMVP/ANDC has good rate performance and cycle stability. It can provide 109 mAh g −1 at 0.5 C and 79.6% capacity retention after 3000 cycles at 5 C. The biological template method is proposed in this paper opens up a simple way for the preparation of other three-dimensional porous network structural materials.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 10
·1-12
·
IF 2.8
Zhao Jiaqi,Hu Chen,Fang Jiapeng,Sun Ruyi,Lu Jingyao,Su Shikun,Lei Zonghao,Fang Pengfei,Feng He,Degao Zhong,Teng Bing
In this work, a series of iso-structural eulyite-type Ba 3 Yb(PO 4 ) 3 :Tb 3+ solid solution phosphors were synthesized via high-temperature solid-phase method. The corresponding unit cell structure, luminescence properties, thermal stability, and chromaticity coordinates of the as-obtained phosphors were systematically investigated. The crystal structure of Ba 3 Yb(PO 4 ) 3 :Tb 3+ was refined by GSAS program, which indicates the oxygen ions in Ba 3 Yb(PO 4 ) 3 are disordered at one C3 site, and the oxygen atoms are distributed at two sites. Under 378 nm ultraviolet excitation, the emission peak of Ba 3 Yb(PO 4 ) 3 :Tb 3+ appears in the range of 450–650 nm, and a characteristic green emission peak appears at 542 nm. Moreover, the luminous intensity of the Ba 3 Yb(PO 4 ) 3 :14 at.% Tb 3+ sample at 160 °C is 87.7% at room temperature, and the quantum yield is 55.8%, which reveals good thermal stability. Our results suggest that the Ba 3 Yb(PO 4 ) 3 :Tb 3+ phosphors are promising high-efficiency green light conversion materials for UV-LED applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
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IF 3.057
Hainan Bai,Jiulin Hu,Xiaoguang Li,Yusen Duan,Feng Shao,Takahiro Kozawa,Makio Naito,Jingxian Zhang
Concerning the safety problems of conventional Li-ion batteries with liquid electrolytes, it is crucial to develop reliable solid-state electrolytes with high ionic conductivity . Li 1+x Al x Ti 2−x (PO 4 ) 3 (LATP, x = 0.3) is regarded as one of the most promising solid electrolytes due to its high ionic conductivity and excellent chemical stability to humidity. Herein, a new strategy is proposed for improving the sintering behavior and enhancing the ionic conductivity of LATP by using LiBO 2 as the sintering aid via liquid phase sintering . The as-prepared sample LATP with homogeneous microstructure and high relative density of 97.1% was successfully synthesized, yielding high total ionic conductivity of 3.5 × 10 −4 S cm −1 and low activation energy of 0.39 eV at room temperature. It was found that the addition of LiBO 2 could effectively enhance the densification and increase the ionic conductivity of LATP electrolyte, proving an effective way to synthesis LATP ceramics by a simple and reliable route.
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高影响因子
Journal of Materials Chemistry A
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2012
·Vol. 1
·期 7
·2508-2514
·
IF 0
Jing Su,Xing-Long Wu,Jong-Sook Lee,Jaekook Kim,Yu-Guo Guo
A facile sol–gel approach combined with a carbon-coating technique via high-temperature thermally decomposing C2H2 has been developed for the synthesis of a Li3V2(PO4)3/C (LVP/C) cathode material employing the biomass of phytic acid as an eco-friendly phosphorus source. The effects of the carbon-coating on the structural, morphological and electrochemical properties of LVP have been investigated. Compared with pristine LVP, the LVP/C composite presents a higher discharge capacity of 127 mA h g−1 at 0.1 C, better rate capability and long-term cyclability in the voltage range of 3.0–4.3 V. Even at a high charge–discharge rate of 5 C, it can still deliver a reversible capacity of 107 mA h g−1 over 400 cycles without obvious fading, demonstrating great potential as a superior cathode material for lithium-ion batteries.
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DOI
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xudong Wang,Jiepeng Chen,Yun Huang,Jiapin Liu,Lei Fu,Li Liu,Wenping Zeng,Jie Xiao,Xiaoyan Zhang,Xing Li,Mingshan Wang,Yuanhua Lin,Haijun Cao
Na4MnV(PO4)3 (NMVP) has gained attention for its high redox potential, good cycling stability, and competitive price but suffers from poor intrinsic electronic conductivity and Jahn–Teller effect from Mn3+. In this work, cation/anion doping strategy was used for Aspergillus niger-bioderived carbon-coated NMVP (NMVP/AN) to improve the structural stability and electrochemical performance, where Al3+ doping inhibited the dissolution of Mn and enhanced the Mn3+/Mn2+ redox pair activity; besides, F– doping not only weakens the Na2–O bond but also endows the hierarchical and porous structure of NMVP/AN, which led to a more rapid and fluid transfer of Na+. The elaborately designed Na3.9Mn0.9Al0.1V(PO4)3/AN (NMAVP/AN) exhibits 105.9 mA h g–1 at 0.5 C, and the as-prepared Na3.1MnV(PO3.7F0.3)3/AN (NMVPF/AN) delivers 104.1 mA h g–1 at 5 C. Further demonstration of the hard carbon//NMAVP/AN full cell manifests the good potential of Al3+-doped NMVP/AN for practical applications (100.6 mA h g–1 at 1 C). These findings open up the possibility of unlocking the high-performance Na superionic conductor (NASICON).
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Shaoxiong Liu,Jing Dai,Xuexue Li,Jianjun Xia,Mingyang Xie,Zhifeng Huang,Li Liu
Mn 0.5 Ti 2 (PO 4 ) 3 with a NASICON structural is used as an anode material in potassium-ion batteries due to its abundance of vacancies that can hold potassium ions . This characteristic not only contributes to its excellent stability but also results in a high specific capacity. However, the poor electrical conductivity of the polyanionic type structure limits the material's ability to fully utilize its capacity. In this paper, the conductivity and electrochemical stability of the Mn 0.5 Ti 2 (PO 4 ) 3 anode material are enhanced through composite formation with an F-doped carbon layer. The introduction of F into the carbon matrix creates a large number of vacancy defects and F active sites. The vacancies enhance the transport of potassium ions on the Mn 0.5 Ti 2 (PO 4 ) 3 material's surface, while the active sites exhibit strong electronegativity , improving the absorption of potassium ions. Therefore, the diffusion impedance of potassium ions is significantly reduced, leading to an increased diffusion rate of potassium ions. Attributing to the improved reaction kinetics, the Mn 0.5 Ti 2 (PO 4 ) 3 @F-doped carbon composite demonstrates a high specific capacity of 86 mA h g −1 at 10,000 mA g −1 when used as the anode for potassium-ion batteries. Even more, the specific capacity remains a capacity of 136 mA g −1 after 3000 cycles at 1000 mA h g −1 . This study enhances our comprehension of material design by investigating the alteration of carbon matrix to promote the electrochemical characteristics of materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Kunqi Liu,Junxia Wang,Jin Wang,Die Liu,Youqin Huang,Zhenjin Fu,Xi Zhang
In this study, the novelly designed Sr 0.5 Zr 2 (PO 4 ) 3 –Ce 0.5 Sm 0.5 PO 4 composite ceramics were utilized as nuclear waste form to simultaneously immobilize simulated fission products Sr and actinide nuclides. The phase transition mechanism, thermokinetics and densification behavior of Sr 0.5 Zr 2 (PO 4 ) 3 –Ce 0.5 Sm 0.5 PO 4 composite ceramics based on in-situ synthesis were systemically analyzed by XRD, in-situ XPS, TG-DSC, SEM and density measurements. The results demonstrate that the formation of Ce 0.5 Sm 0.5 PO 4 solid solution phase preceded that of Sr 0.5 Zr 2 (PO 4 ) 3 phase, of which there is a valence change of Ce from Ce 4+ to Ce 3+ before 1023 K. Additionally, as for the exothermic crystallization enthalpy, change of exothermic crystallization enthalpy and activation energy, the values of Sr 0.5 Zr 2 (PO 4 ) 3 and Ce 0.5 Sm 0.5 PO 4 phases in composite ceramics are 286.17 – 515.61 mJ, 19.11 – 35.38 J/g, 702.45 kJ/mol and 145.21 – 232.44 mJ, 9.26 – 15.44 J/g, 450.04 kJ/mol, respectively. It is then indicated that the formation of Ce 0.5 Sm 0.5 PO 4 phase is definitely more favorable than that of Sr 0.5 Zr 2 (PO 4 ) 3 phase. Simultaneously, the relative densities of Sr 0.5 Zr 2 (PO 4 ) 3 –Ce 0.5 Sm 0.5 PO 4 composite ceramics are more than 95 % when the sintering temperature exceeds 1273 K.
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高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 4
·286
·
IF 21.8
Mao Gaoqiang,Lu Jingfan,Cai Haiyan,Yu Wanjing,Tong Hui,Guo Xueyi,Zeng Leiying,Jiang Long
Increasing the operating voltage can significantly increase the energy density of LiCoO 2 , but it is accompanied by severe structural damage and interface degradation. Especially at a high voltage above 4.5 V, LiCoO 2 faces severe challenges, such as irreversible phase transition, lattice oxygen loss, and electrode–electrolyte interface evolution. Herein, a high-voltage LiCoO 2 cathode material with bulk doping and surface coating synergistic modification was designed and prepared. The doped Mg 2+ ions entered the lithium layers as pillars, stabilizing the layered framework. Meanwhile, Li 1.3 La 0.3 Ti 1.7 (PO 4 ) 3 was uniformly coated on the surface of LiCoO 2 , which is beneficial for suppressing Co 3+/2+ ion leaching and interface side reactions during cycling. Furthermore, Li 1.3 La 0.3 Ti 1.7 (PO 4 ) 3 is a fast ion conductor, which facilitates the rapid transport of lithium ions on the surface of the cathode material. Owing to the synergistic effect of Mg 2+ ion doping and Li 1.3 La 0.3 Ti 1.7 (PO 4 ) 3 coating, the orbitals of Co 3d and O 2p in LiCoO 2 crystal are changed, and the irreversible phase transition and oxygen loss are inhibited. The modified material exhibited an excellent electrochemical performance. A discharge capacity of 175.5 mAh·g −1 at 10 C rate, as well as a capacity retention of 90.14% after 200 cycles at 1 C rate, was achieved in the modified material. This work supplies a new method for developing high-voltage oxide cathodes through bulk and interfacial modification.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Min Xie,Xiaoying Li,Yufan Chen,Xiangyue Liao,Qiaoji Zheng,Heng Zhang,Kwok-Ho Lam,Dunmin Lin
Sodium superionic conductor (NASICON)-type phosphates cathodes have attracted considerable attention due to their high operational voltage and robust three-dimensional (3D) framework; however, the poor intrinsic electronic conductivity and low energy density hinder their broader application. Herein, a novel NASICON-type Na 3 V 1.44 Fe 0.5 Mo 0.06 (PO 4 ) 3 cathode was designed through Fe/Mo dual-doping at the V sites of Na 3 V 2 (PO 4 ) 3 and synthesized via a conventional high-temperature solid-state method. The introduction of Fe 3+ activates the V 4+ /V 5+ redox couple at a high voltage plateau (∼ 4.0 V), while also generates additional Fe 2+ /Fe 3+ and V 4+ /V 5+ redox pairs. Meanwhile, the doing of Mo 6+ creates cation vacancies, effectively modulating the electronic structure of vanadium and promoting ionic transport kinetics. Benefiting from this dual-doping strategy, the Na 3 V 1.44 Fe 0.5 Mo 0.06 (PO 4 ) 3 cathode delivers a high capacity of 123.4 mAh g −1 at 0.2C and an impressive energy density of 406 Wh kg −1 within 2.2–4.2 V. Moreover, it exhibits outstanding cycling stability, presenting a capacity retention of 92 % after 2500 cycles at 30C. This work highlights a viable strategy for advancing high-performance NASICON-type cathodes through complex metal ion doping.
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PubMed
高影响因子
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