JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 28
·期 7
·2413-2423
·
IF 2.5
Lu Chengwei,Yu Liyue,Zhou Xiaozheng,Gan Yongping,He Xinping,Huang Hui,Zhang Jun,Zhang Wenkui,Xia Xinhui,Xiao Zhen,Fang Ruyi,Xia Yang
Lithium sulfide (Li 2 S) is a promising alternative cathodic material for lithium–sulfur batteries, which can alleviate the volume expansion of sulfur‑based cathodes. As a fully lithiated cathode, Li 2 S can be paired with Li-free anodes, thereby increasing the selectivity of anodic materials. Nevertheless, Li 2 S cathode is hindered by its high cost, harsh preparation conditions, and inadequate conductivity, which impose limitations on its practical application. Hence, the crucial factor in enabling the practicality of Li 2 S cathode is the development of low-cost and facile synthetic methods to produce highly conductive Li 2 S material. Herein, a high‑conductivity Li 2 S@C/CNT composite cathode is prepared using low-cost Li 2 SO 4 as a lithium source through a facile spray drying technique combined with carbothermal reduction method. Benefiting from the high-speed three-dimensional pathway for electron transport provided by the in-situ formed botryoidal highly conductive network, the Li 2 S@C/CNT cathode exhibits ultrahigh initial discharge capacity (1028.5 mA h g − 1 @1 C), superior cycle stability (520.6 mA h g − 1 after 200 cycles), and remarkable rate capability (301.8 mA h g − 1 @5 C). This work not only presents a simple and feasible approach for the low-cost preparation of high‑performance Li 2 S cathode, but also proposes an innovative idea for advancing the development of high energy density lithium–sulfur batteries.
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高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 22
·3498-3505
·
IF 4.446
Su Nie,Li Liu,Min Li,Junfang Liu,Jing Xia,Yue Zhang,Xianyou Wang
Graphical The unique structure of these one-dimensional nanofibers with two-dimensional nanosheets on the surface is successfully synthesized. Large specific surface area can greatly shorten the diffusion routes for both electrons and ions. Besides, the carbon matrix can dramatically improve the overall conductivity. As a result, the anode exhibits excellent electrochemical capability for sodium-ion batteries. Na 2 Ti 3 O 7 /C nanofibers are successfully synthesized through an electrospinning process followed by hydrothermal treatment. The unique structure of these one-dimensional nanofibers with two-dimensional nanosheets on the surface is presumed to significantly shorten the diffusion routes for both electrons and ions. Meanwhile, the carbon matrix with a certain degree of graphitization can dramatically improve the overall conductivity. As a result, the Na 2 Ti 3 O 7 /C nanofiber electrode reveals an impressive electrochemical capability as the anode material of sodium-ion batteries. It demonstrates a reversible capacity of 110 mA h g −1 after 500 cycles at a rate of 1 C. Moreover, with almost no capacity degradation, the discharge capacity of the Na 2 Ti 3 O 7 /C nanofiber electrode remains at 58 mA h g −1 after 1500 cycles at the high rate of 50 C. This superior electrochemical performance places the Na 2 Ti 3 O 7 /C nanofibers as an anode material with great promise for sodium-ion batteries that could be applied in large-scale energy storage.
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Sheng Liang,Ranlin Dong,Shaohua Lu,Lei Hu,Lingli Liu,Qiang Dong,Chonghai Deng,Guangchao Qin,Mao Xu,Chu Liang
Lithium sulfide (Li 2 S) is considered as a promising alternative for the intercalation–type cathode materials because of its high theoretical specific capacity (1166 mAh g –1 ). However, the large–scale application of Li 2 S is limited by its intrinsic low electronic/ionic conductivity and severe shuttle effect of polysulfides. Herein, we report a facile and green method to the in–situ synthesis of Li 2 S–molybdenum (Mo) nanocomposites at room temperature by mechanochemical reaction of lithium hydride with molybdenum sulfide. The fig–like carbon coated Li 2 S–Mo (Li 2 S–Mo@C) nanocomposite with core–shell structure exhibits a low initial activation barrier of 2.51 V, high reversible capacity of 742 mAh g − 1 after 70 cycles at 0.2 A g − 1 and excellent cycling stability over 500 cycles at 1.0 A g − 1 . According to density functional theory calculation and experimental studies, the excellent electrochemical performance of fig–like Li 2 S–Mo@C nanocomposite can be attributed to the increased electronic/ionic conductivity, strong adsorption ability and catalytic conversion of lithium polysulfides, resulting from the synergistic effects of Mo nanodots and, carbon shell and their nanostructure. This work provides a new idea for developing large–scale applications of Li 2 S–based electrodes.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Hao Gu,Yi Jiang,Xijia Yang,Yue Yang,Xuesong Li,Liying Wang,Wei Lü
Flexible and wearable pressure sensors have attracted significant attention due to their wide range of potential applications. However, they often suffer from low sensitivity, narrow pressure detection range, and poor mechanical flexibility. In this work, a multifunctional 3D pressure sensor based on a ternary metal oxide@carbon-based sponge (C–NiCoZn–O/CMF) was developed by the hydrothermal method. The pressure feedback layer of the sensor was uniformly coated with C–NiCoZn–O on the surface of the framework, which improved the device’s conductivity, sensitivity, and stability significantly. The sensitivities of 41.99, 23.39, and 11.19 kPa–1 are in the ranges 0–4.01, 4.01–8.39, and 8.39–20.1 kPa, respectively, and the cyclic retention rate exceeded 90% after 2000 cycles. The C–NiCoZn–O/CMF composite demonstrated excellent electrochemical performance as an electrode for supercapacitors, with a high specific capacity of 2030 mF/cm2 at a current density of 1 mA/cm2 and a high capacity retention rate of 81.55% after 4000 cycles. As a multifunctional device, when integrated with a microprocessor, it can easily detect and process a large amount of human physiological signal data in daily work scenarios. Present composites maintain adjustable conductivity and extremely high elasticity even under extreme conditions such as liquid nitrogen and high temperatures up to 85.6 °C. This work is expected to play a great role in polar exploration, volcano survey, deep space exploration, etc.
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高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 7
·期 2
·394-401
·
IF 5.934
Yushan Luo,Mengli Tao,Jianhua Deng,Renming Zhan,Bingshu Guo,Qianru Ma,Muhammad Kashif Aslam,Yuruo Qi,Maowen Xu
K-ion batteries (KIBs) are considered as one of the most promising devices for large-scale energy storage because of the comparable output voltage with lithium-ion batteries and the abundant reserves of potassium. FeS2 is regarded as a kind of very important anode material for KIBs due to its low cost and high capacity. However, the poor electronic conductivity and huge volume expansion of FeS2 during the discharge/charge process strongly inhibit the K-storage performance. To solve these problems, herein, unique core–shell FeS2@C nanocubes with nanoparticles in the interior and carbon shells in the exterior are designed. The inside FeS2 nanoparticles are beneficial for K+ diffusion and the penetration of the electrolyte, while the outside carbon shells can enhance the electronic conductivity and suppress the volume expansion. The unique core–shell structure displays outstanding K-storage performance with impressive specific capacity, excellent cycling stability, and superior rate capability with 73% capacity retention at 2 A g−1. This work not only provides solutions to obtain a superior anode material for KIBs but also offers insights into designing a hierarchical structure for energy storage systems.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 21
·期 1
·125-131
·
IF 2.327
Ren Yurong,Lu Peng,Huang Xiaobing,Ding Jianning,Wang Haiyan
Li 2 ZnTi 3 O 8 /C nanocomposite has been synthesized using phenolic resin as carbon source in this work. The structure, morphology, and electrochemical properties of the as-prepared Li 2 ZnTi 3 O 8 samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), Raman spectroscopy (RS), galvanostatic charge–discharge, and AC impedance spectroscopy. SEM images show that Li 2 ZnTi 3 O 8 /C was agglomerated with a primary particle size of ca. 40 nm. TEM images reveal that a homogeneous carbon layer (ca. 5 nm) formed on the surface of Li 2 ZnTi 3 O 8 particles which is favorable to improve the electronic conductivity and inhibit the growth of Li 2 ZnTi 3 O 8 during annealing process. The as-prepared Li 2 ZnTi 3 O 8 /C composite with 6.0 wt.% carbon exhibited a high initial discharge capacity of 425 and 159 mAh g −1 at 0.05 and 5 A g −1 , respectively. At a high current density of 1 A g −1 , 95.5 % of its initial value is obtained after 100 cycles.
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高影响因子
Nanoscale
·
2021
·Vol. 13
·期 13
·6635-6643
·
IF 7.79
Die Su,Jing Dai,Min Yang,Jiaxing Wen,Jianping Yang,Wen Liu,Hai Hu,Li Liu,Yan Feng
TiO2-red phosphorus/C nanofibers (TiO2-RP/CN) have been synthesized via electrospinning and then annealed with red phosphorus sublimation. Benefiting from the high electronic/ionic conductivity and robust stability of the unique structure, the TiO2-RP/CN show high reversible capacities, as well as an outstanding cycling ability. In K half cells, the capacity decay of the TiO2-RP/CN electrode mainly occurs in the first few cycles, and at 0.05 A g−1 it delivers a high specific capacity of 257.8 mA h g−1 after 500 cycles. K full cells were fabricated; these are well-matched with PTCDA (perylene-3,4,9,10-tetracarboxylic dianhydride) and also exhibited a good electrochemical performance (62 mA h g−1 after 100 cycles). Therefore, the TiO2-RP/CN are potential anode materials for use in K-ion batteries.
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高影响因子
Nano Research
·
2020
·Vol. 14
·期 1
·139-147
·
IF 8.183
Pan Jun,Wang Nana,Li Lili,Zhang Feng,Cheng Zhenjie,Li Yanlu,Yang Jian,Qian Yitai
Ti-based anode materials in sodium ion batteries have attracted extensive interests due to its abundant resources, low toxicity, easy synthesis and long cycle life. However, low Coulombic efficiency and limited specific capacity affect their applications. Here, cubic-phase TiP 2 O 7 is examined as anode materials, using in-situ/ex-situ characterization techniques. It is concluded that the redox reactions of Ti 4+ /Ti 3+ and Ti 3+ /Ti 0 consecutively occur during the discharge/charge processes, both of which are highly reversible. These reactions make the specific capacity of TiP 2 O 7 even higher than the case of TiO 2 that only contains a simple anion, O 2− . Interestingly, Ti species participate only one of the redox reactions, due to the remarkable difference in local structures related to the sodiation process. The stable discharge/charge products in TiP 2 O 7 reduce the side reactions and improve the Coulombic efficiency as compared to TiO 2 . These features make it a promising Ti-based anode for sodium ion batteries. Therefore, TiP 2 O 7 @C microflowers exhibit excellent electrochemical performances, ~ 109 mAh·g −1 after 10,000 cycles at 2 A·g −1 , or 95.2 mAh·g −1 at 10 A·g −1 . The results demonstrate new opportunities for advanced Ti-based anodes in sodium ion batteries.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 28
·16984-16990
·
IF 3.108
Jian-Min Zhu,Tian Xia,Kang-Kang Yan,Wei-Jui Chang,Xue-Gang Chen,Ying Ye,Ping-Ping Zhang
LiFePO4 is an effective battery material which has gained global focus. In this study, we prepared a novel Cu+-doped Li[Fe0.9Cu0.1Li0.1]PO4/C cathode material via a carbothermal reduction method using glucose as carbon source. X-ray diffraction (XRD) patterns and Rietveld refinement on the samples are consistent with the orthorhombic phase and showed that the substituting Cu+ ions and excess Li+ ions occupy the Fe sites. The micro-morphology of the samples indicates that Cu+ doping can decrease the particle size and maintain the crystal structure of LiFePO4/C. XP spectra confirmed that the surface oxidation states of Fe and Cu are +2 and +1, respectively. The as-prepared Li[Fe0.9Cu0.1Li0.1]PO4/C composite exhibits enhanced initial discharge capacity (148.8 mA h g−1) compared to the un-doped LiFePO4/C. The discharge capacity remains at 149.8 mA h g−1 after 50 cycles at a rate of 0.2C, which displayed an excellent cycling stability. Furthermore, the cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) results showed that the Cu+-doped LiFePO4/C composite exhibits a higher lithium-ion diffusion coefficient and lower charge transfer resistance than the undoped counterparts. This study presents a novel Cu+-doped LiFePO4/C cathode material with enhanced electrochemical properties, which could be potentially applied as a battery material.
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高影响因子
Energy Technology
·
2017
·Vol. 5
·期 9
·1656-1662
·
IF 2.789
Yifan Chen,Yangfan Lin,Ning Du,Chengmao Xiao,Shali Wu,Yaguang Zhang,Deren Yang
We report the synthesis of Zn 2 GeO 4 nanorods using a simple hydrothermal process. After the coating of a carbon layer by the thermal decomposition of acetylene gas, the Zn 2 GeO 4 @C core–shell nanorods were obtained. The as-synthesized Zn 2 GeO 4 @C core–shell nanorods were used as anode materials of lithium-ion batteries, which showed good cycling and rate performance. A highly reversible specific capacity of 718 mAh g −1 after 400 cycles was achieved at a current density of 400 mA g −1 . The core–shell nanostructures and partially amorphous and porous nanostructures helped to alleviate the volume change and enhance the conductivity during the charge/discharge process, which may be responsible for the good performance.
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高影响因子
Nanoscale
·
2022
·Vol. 14
·期 29
·10375-10388
·
IF 8.307
Congyu Zhou,Zhengjun Yao,Bo Wei,Wenying Li,Zhejia Li,Xuewei Tao,Jintang Zhou
The increasing hazard of electromagnetic radiation prompts people to pursue absorbing materials with better performance. However, absorbing materials with a single loss mechanism usually is unable to obtain better absorbing performance due to low impedance matching or high filling ratio. Therefore, this work proposes a C/NiCo2S4 (CNCS) material with both dielectric loss/magnetic loss to achieve efficient absorption of electromagnetic waves. The simple preparation of CNCS materials was achieved through the etching of the ZIF-67 template by nickel nitrate and the subsequent hydrothermal vulcanization process. Its unique prismatic dodecahedron hollow structure promotes multiple scattering of electromagnetic waves. The attachment of the magnetic NiCo2S4 particles on the surface of the carbon template further promotes the interface polarization and dipole polarization, which is equivalent to the formation of a resistance-rich microcircuit and enhances the effect of the conductance loss on electromagnetic waves. At 2–18 GHz, the CNCS-2 with 30% paraffin addition achieves an effective bandwidth of 5.54 GHz at a matching thickness of 1.7 mm, and has a maximum reflection loss of −36.44 dB at 1.5 mm. By adjusting the thickness of the material matching layer (1–3 mm), an effective bandwidth of up to 13.48 GHz can be achieved, perfectly covering the X-band and Ku-band. Based on the simple preparation process of the material, the special hollow structure and the multiple loss mechanisms for electromagnetic waves, we believe that CNCS can become a strong competitor for high-efficiency broadband absorbers.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Jinghui Zhu,Caiming Jiao,Tuo Kang,Liubiao Zhong,Sanfei Zhao,Yejun Qiu
Aiming to commercialize Li S battery, it is very important to achieve high sulfur loading alongside superior electrochemical performance. In this work, a novel composite material with sandwich structure constructed by titanium nitride nanoparticles and boron nitride‑carbon nanofibers (BNC-TiN-BNC), has been successfully prepared through electrospinning and spraying method, and applied as the interlayer in Li S batteries. Compared with the BNCNF interlayer, the sandwich-like BNC-TiN-BNC interlayer shows more excellent chemical adsorption for soluble lithium polysulfides (LiPSs) via the polar effects of the Ti S and S N bonds, and furthermore, the uniform distribution of TiN nanoparticles , filling in the pores between the nanofibers as packing layer of the BNC-TiN-BNC interlayer, can retard the migration of LiPSs more effectively by physical barriers. By introducing the BNC-TiN-BNC interlayer, the electron transfer , capacity and cycling life of Li S batteries have been improved significantly, especially at high current density . With the sulfur loading of 2.5 mg cm −2 , the cell with BNC-TiN-BNC interlayer delivers a high initial discharge capacity of 642.3 mA h g −1 at high current density of 2.0C, and the capacity remains 594 mA h g −1 with only the decay rate of 0.025% over 300 cycles.
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高影响因子
危险品化学品经营许可证（带存储）