RSC Advances
·
2016
·Vol. 6
·期 93
·90455-90461
·
IF 3.289
Peng Lu,Xiaobing Huang,Yurong Ren,Jianning Ding,Haiyan Wang,Shibiao Zhou,Yuandao Chen,Xiang Ding
Na+ and Zr4+ co-doped lithium titanates with the formula Li4−xNaxTi5−xZrxO12 (x = 0, 0.01, 0.03, 0.05, 0.10, 0.15 and 0.20) were successfully synthesized via a solid-state reaction in air. XRD analysis indicates that Na+ and Zr4+ co-doping does not change the spinel structure of Li4Ti5O12 and the lattice parameter slightly increases with the enhancement of doping amount. Smaller particle size and larger BET surface areas are obtained for Na+ and Zr4+ co-doped Li4Ti5O12 samples. The four-point probe method and electrochemical impedance spectroscopy (EIS) results demonstrate that the Na+ and Zr4+ co-doped Li4Ti5O12 samples possess higher electrical conductivity and smaller charge transfer resistance compared with undoped Li4Ti5O12, resulting in improved electrochemical performance. Particularly, Li3.97Na0.03Ti4.97Zr0.03O12 exhibits the best rate capability and cycling stability. Even at 20C, it delivers a discharge capacity of 140 mA h g−1, and after 100 cycles at 10C, 97.7% of its initial capacity is retained.
研究领域:
材料科学
·
电化学
·
储能技术
·
锂离子电池
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yunzhao Liu,Xiaowei Chi,Qi Han,Yuexiu Du,Jianhua Yang,Yu Liu
Sodium–oxygen (Na−O 2 ) batteries are being extensively studied because of their higher energy efficiency and lower cost compared to those of lithium–oxygen (Li–O 2 ) batteries. However, highly efficient and durable cathode catalysts are very limited, thus considerably hindering the application of Na–O 2 batteries. Herein, a vertically self-standing C@NiCo 2 O 4 nanoneedle arrays (C@NiCo 2 O 4 -NAs) have been delicately designed and fabricated by a facile hydrothermal method . The NiCo 2 O 4 nanoneedles are in-situ grown on the carbon paper , forming an unique urchin-like structure, which is directly used to Na–O 2 batteries as a self-standing and binder-free cathode for the first time. Under a current density of 50 mA g −1 , the Na–O 2 battery containing C@NiCo 2 O 4 -NAs cathode shows a high initial discharge capacity of 6500 mAh g −1 (based on NiCo 2 O 4 material mass) and low over-potential of 0.6 V due to the numerous catalytic sites and high electron mobility of C@NiCo 2 O 4 -NAs. SEM, XPS and FTIR tests have confirmed the formation of thin film-like Na 2 O 2 discharge product on the surface and gaps of NiCo 2 O 4 nanoneedles, and the special film-like structure can facilitate the decomposition of Na 2 O 2 in the subsequent charging process and reduce the over-potential notably. Meanwhile, the robust urchin-like structure of C@NiCo 2 O 4 -NAs renders the Na–O 2 battery a high cyclic stability up to 120 cycles when the specific capacity is limited to be 800 mAh g −1 .
研究领域:
储能
·
材料科学
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 37
·13052-13058
·
IF 4.39
Hui Zheng,Changhao Ding,Han-Shu Xu,Lulu Tang,Huimin Liu,Lianwei Wei,Kaibin Tang
Several FeS-derived intercalated compounds (C2H8N2)xFeS and Ax(C2H8N2)yFeS (A = Li, Na) were successfully synthesized via a novel ammonothermal method. The powder X-ray diffraction (XRD) measurements reveal that the FeS intercalated samples have the same tetragonal crystal structure as the parent FeS. After intercalation, these three as-synthesized samples do not show superconductor behavior, which is confirmed by the magnetization and the electrical resistivity measurements. (C2H8N2)xFeS exhibits paramagnetic semiconductor behavior, while the newly synthesized Ax(C2H8N2)yFeS (A = Li, Na) shows antiferromagnetic semiconductor behavior. The absence of superconductivity in these FeS-derived compounds should be closely related to the iron vacancies in the FeS layer.
研究领域:
材料科学
·
固体化学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaowei Li,Xing Shen,Junmei Zhao,Yang Yang,Qiangqiang Zhang,Feixiang Ding,Miao Han,Chunliu Xu,Chao Yang,Huizhou Liu,Yong-Sheng Hu
Na-ion batteries (NIBs) have been considered as potential candidates for large-scale energy storage, where O3-type Na-based layered oxide cathodes have attracted great attention due to their high capacity and low cost. However, O3-NaxTMO2 materials still suffer from insufficient air stability, which could lead to deteriorative electrochemical properties and thus hinder their practical application. In this work, a series of Al-doped O3-NaFe(1/3–x)Ni1/3Mn1/3AlxO2 cathodes prepared by a co-precipitation method were investigated to enhance their electrochemical performance and air stability through stabilizing their structural and interface chemical properties. The Al-doped O3-NaFe(1/3–0.01)Ni1/3Mn1/3Al0.01O2 (NFNMA0.01) cathode delivers a comparable capacity of 138 mAh g–1 and keeps a capacity retention of 85.88% after 50 cycles at 0.2 C, while the undoped O3-NaFe1/3Ni1/3Mn1/3O2 (NFNM) can only keep a capacity retention of 71.02%, although with an initial capacity of 141 mAh g–1 at 0.2 C. For the air stability, the capacity decay rates are 58.87 and 5.07% for the undoped NFNM and Al-doped NFNMA0.01 after the air exposure for 30 days, respectively. The greatly decaying electrochemical performance could be due to the formation of carbonates during air exposure, which can be efficiently suppressed by Al doping. The doped Al3+ has been confirmed to be inserted into the NFNM crystal lattice, inducing the reduced values of lattice parameters a and c due to the smaller ionic radius of Al3+ (53.5 pm) vs Fe3+ (55.0 pm). This study demonstrates that Al doping plays an important role in the air stability and cycling stability for layered cathode materials, which offers an efficient strategy to optimize the material design for their practical application in NIBs.
研究领域:
储能
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 48
·17486-17492
·
IF 4.099
Fangfang He,Lei Wang,Cuifang Hu,Jing Zhou,Qian Li,Ling Huang,Daojiang Gao,Jian Bi,Xin Wang,Guohong Zou
Four antimony fluoride sulfates named A2SO4·SbF3 (A = Na+, NH4+, K+, Rb+) have been successfully synthesized using a hydrothermal method by introducing Sb3+ cations with a stereochemically active lone pair in sulfates and subsequently tuning the structure through the second monovalent cations. All of the title compounds are stoichiometrically equivalent materials which share a common structural motif composed of a distorted SO4 tetrahedron and an asymmetric SbF3 polyhedron. However, the macroscopic centricities of these four compounds are significantly influenced by the size and coordination environment of cations; Na2SO4·SbF3 crystallizes in centrosymmetric space groups Cmca and (NH4)2SO4·SbF3 in Pbca, while K2SO4·SbF3 and Rb2SO4·SbF3 crystallizes in noncentrosymmetric space group P212121. Complete characterization including thermal analyses, infrared and UV-vis spectroscopy, and theoretical calculations is also reported. Powder second harmonic generation measurement for noncentrosymmetric K2SO4·SbF3 and Rb2SO4·SbF3 indicated that both of them are type I phase-matchable.
研究领域:
无机化学
·
材料科学
·
非线性光学
·
晶体工程
·
固态化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 33
·17491-17502
·
IF 11.9
Qingyuan Liu,Jianchao Chen,Danni Du,Shuxian Zhang,Chunyan Zhu,Zhiwei Zhang,Chengxiang Wang,Longwei Yin,Rutao Wang
Sodium-ion capacitors (SICs) have long been pursued as economically favorable alternatives to their well-developed lithium-ion counterparts. However, their commercialization suffers from the immature pre-sodiation technology in existence, primarily due to the increased cost and risk invoked by the use of highly reactive metallic sodium and sodium containing additives as sodium sources. Herein, we uncover a unique approach based on the use of prelithiated carbon as the anode for SICs. The prelithiated hard carbon anode with the preformed solid-electrolyte-interphase (SEI) layer can effectively compensate the large irreversible capacity loss and greatly improve the initial coulombic efficiency of SICs. Besides, the preformed Li-based SEI layer is effective in controlling the Na-ion intercalation behavior of the carbon anode, as confirmed by the reversible capacity that is mainly contributed by the extended slope region without the low-potential plateau region, thus avoiding the safety issues from Na metal plating. These features endowed by the pre-lithiation strategy enable us to use a slope region-dominated soft carbon anode for high-safety SICs with high capacity and superior rate capability. This work possesses far-reaching potential to implant the mature pre-lithiation technology into sodium-ion energy storage systems to resolve the scientific bottleneck from the immature pre-sodiation technology.
研究领域:
能量存储
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Usman Ghani,Nousheen Iqbal,Jinghan Li,Ahmed A. Aboalhassan,Boya Sun,Bowen Liu,Farman Ullah,Johar Zeb,Muhammed Imtiaz,Jiajun Gu,Qinglei Liu
Porous hard carbons (PHC) are promising anode materials in sodium-ion batteries; however, the availability of large surface area creates numerous irreversible active sites that cause rapid initial cycle capacity fading and electrode degradation, resulting in lower specific capacity and poor cycle stability. PHC surface modification via 2D transition metal dichalcogenides is a synergistic approach to combine excellent electrochemical properties of both materials and resolve these issues. Therefore, we designed 1T MoS 2 nanopatterned PHC skeleton using carbonization and hydrothermal treatment of biomass (chickpea husk). As a result, HC@MoS 2 -II electrode with extended d 002 spacing of MoS 2 nanolayers (0.650 nm) exhibited an excellent specific capacity of 470 mAh/g at 50 mA/g with high initial coulombic efficiency (63%) and ultra-long cycle stability (190 mAh/g) at 1000 mA/g over 3500 cycles. The extraordinary electrochemical performance can be attributed to the synergistic assembly, where the high surface area PHC skeleton effectively buffered large volume expansion during charging/discharging, and 1T MoS 2 nanoflowers added fast ionic diffusion kinetics and PHC surface protection.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Nature Nanotechnology
·
2026
·
IF 37.5
Jin Ruo-Xi,Lei Xincheng,Su Xiao-Chuan,Zhang Xing,Zhao Yao,Qi Xiaodong,Lu Zhuo-Ya,Zhang Xu-Sheng,Zhang Yu-Ying,Zhang Jin,Yuan Qingxi,Zhang Jing,Zheng Lirong,Guo Yu-Jie,Xin Sen,Su Dong,Wen Rui,Wan Li-Jun,Guo Yu-Guo
The Fe( III )|Fe( IV ) redox couple in iron-containing Na layered oxides enables high-capacity, cost-effective positive electrodes. However, although a high iron content (when the Fe concentration exceeds 33 at.% on transition metal layers) leads to rapid capacity decay during battery cycling, the underlying mechanism of this detrimental behaviour remains unclear. Here we report that the electrochemomechanical failure mechanism in Fe-rich Na layered oxides is related to the stability of the Fe octahedral coordination environment at the nanoscale. Fe-ion migration and dissolution govern the formation of intragranular microcracking in the positive electrode active material particles, accompanied by dislocations and an uneven distribution of mechanical stress. Driven by the non-uniform strain field, microcracks proliferate and planar gliding occurs, resulting in a stepped surface. By nanoscale doping with Al( III ) (1 at.%), Y( III ) (1 at.%) and Co( III ) (3 at.%), we inhibit the Fe-ion migration and dissolution, thereby reducing cracks and planar gliding. Using the multi-element nanoscale-doped iron-rich sodium layered oxide at the positive electrode and a hard-carbon-based negative electrode, we assembled and tested 2.7-Ah Na-ion pouch cells showing an initial specific energy of 121 Wh kg −1 (based on the total mass of the cell) at 26 mA g −1 , and a discharge capacity retention of 83.4% after 2,000 cycles at 130 mA g −1 at 25 °C.
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Xueqiong Lei,Fan Zhang,Xin Wang,Xiaoyue Ma,Xinhui Li,Chao Wang,Tailong Che,Changlong Li,Zhan Jie Wang
Due to their exceptional power density and fast charge–discharge performance, dielectric ceramic capacitors have emerged as vital components in advanced pulsed power systems. However, concurrently achieving excellent recoverable energy density (Wrec) and high efficiency (η) in lead-free systems remains challenging. Herein, a multi-scale high-entropy design strategy is proposed for (Bi0.5Na0.5)0.94Ba0.06TiO3-based relaxor ferroelectrics. The approach involves sequentially introducing (Sr0.7Bi0.2)TiO3 and (Bi0.5La0.5)(Nb1/3Mg2/3)O3 to construct a high-entropy system that simultaneously regulates material behavior across lattice, microstructural, and electronic structure scales. This coordinated approach induces strong lattice distortion and local random fields to disrupt ferroelectric order and stabilize polar nanoregions, while sluggish diffusion kinetics refine grain morphology and wide-bandgap ions enhance breakdown strength. Consequently, an ultrahigh energy storage performance with Wrec ∼10.72 J cm−3 and η ∼86.9% is achieved at 698 kV cm−1, accompanied by excellent energy storage stability and high hardness (∼8.58 GPa). This work demonstrates that multi-scale high-entropy design is an effective paradigm for developing advanced lead-free energy storage ceramics.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Qing Xu,Guojie Wu,Jiamin Deng,Xi Ke,Zhicong Shi,Liying Liu
Large K + ions act as structural pillars to enhance crystal stability. • Mg doping introduces additional vacancies to accelerate Na + diffusion. • K Mg co-doping significantly enhances rate performance and cycling stability at 4.5 V. The polyanionic compound Na 3 V 2 (PO 4 ) 2 F 3 (NVPF) cathode material has attracted extensive attention due to its high theoretical specific capacity (128 mAh g −1 ) and energy density (500 Wh kg −1 ). The primary bottleneck for NVPF is the low intrinsic electronic conductivity, which results in poor long cycling and rate performance. A K Mg co-doped Na 2.92 K 0.08 V 1.95 Mg 0.05 (PO 4 ) 2 F 3 (NKVMPF) cathode material is designed in this work to address the above problem. K Mg co-doping improves the Na + diffusion kinetics and crystal structure stability of NVPF due to the increased lattice volume, introduced additional vacancies, and the pillar supporting role of K + with larger radius. At a potential window of 2.0 V–4.5 V, the NKVMPF delivers superior rate performance and long-term cycle ability compared to NVPF, with a specific discharge capacity of 66.9 mAh g −1 at the high current rate of 20C and a capacity retention of 81.1% after 250 cycles at 0.2C. This work provides a binary doping strategy suitable for polyanion cathode materials and offers a new perspective for the development of high-performance cathode materials for sodium-ion batteries (SIBs).
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 22
·1686
·
IF 4.3
Yan Xu,Qihua Sun,Jialin Li,Zhaofeng Wu,Haiming Duan
Ethylene glycol (EG) is a vital industrial raw material. However, it has the potential to be hazardous to the environment and human health. High operating temperatures and long response/recovery times limit the wide application of EG sensors. Thus, we need to develop high-performance room-temperature EG-sensing materials. This paper proposes the direct hydrothermal carbonization of magnolia hair to prepare porous microtubular carbon (CMH) for room-temperature EG sensing. SEM, TEM, and XPS characterization showed that the CMH exhibited a porous microtubular structure and contained Na, which enhanced the adsorption capacity of the CMH for ethylene glycol gas. The CMH sensor exhibits a high response (156.4) to 500 ppm ethylene glycol gas at room temperature with moderate response/recovery time (14.2/37.3 s). It exhibits good linearity in measuring EG gases in the 10–100 ppm range, with a 0.292 ppm theoretical detection limit. Additionally, CMH sensors provide excellent repeatability and long-term stability. The synergistic effect of microtubule porous structure and Na doping is the main reason for enhancing the response of the sensor to EG gas. On this basis, the gas-sensitive enhancement mechanism of CMH was analyzed. The results show that biomass carbon materials provide a new method to prepare high-performance EG gas sensors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Jiayu Li,Haoxu Zhan,Bingjun Su,Yiqun Yao,Yiran He,Wu Zhang,Zeqiang Zhong,Lei Li,Dongyan Zhang,Hao Yang,Chao Li
Sodium manganese hexacyanoferrate, also called Prussian white (PW), has attracted much attention as a promising cathode material for Na-ion batteries due to its high-voltage platform and inexpensive elemental composition. However, their parasitic vacancies and water molecules often deteriorate the electrochemical performance. Proper regulation of such defects in scale-up preparation is still a challenge. In this work, PW was prepared via aqueous precipitation assisted by manganese oxalate in a 10 L reactor. High-quality Na2.32Mn[Fe(CN)6]0.95□0.05·1.97 H2O was obtained and exhibited a specific capacity of 148 mAh g–1. The phase transition from monoclinic to rhombohedral during long-term cycling for such an ultra-Na-rich cathode has been first reported. In addition, the vacuum drying temperature was further discussed, and 150 °C is more suitable for achieving the balance between dehydration and electrical properties.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）