ELECTROCHEMISTRY
·
2020
·Vol. 88
·期 6
·532-539
·
IF 1.099
Ruifang CHEN,BiXia WEN,Changwei SU,Wei BAI,Junming GUO
LiMn2O4 cathodes are prepared by a rapid microwave-induced solution combustion method. Their initial discharge capacity is significantly improved by introducing trace Ni. For example, the LiMn1.975Ni0.025O4 (LMNO-0.025) cathode releases an initial discharge capacity of 134.1 mAh g−1 at 1 C, even 144.5 mAh g−1 at 0.5 C, which is far higher than of the pristine LiMn2O4 cathode (119.7 mAh g−1 at 1 C) and close to its theoretical capacity of 148.2 mAh g−1. After 1000 cycles, the capacity retention of the LMNO-0.025 sample reaches 56.53 % at 1 C, and it can be presented the higher capacity retentions of 66.79 % at 5 C and 66.89 % at 20 C. The robust structure stability proved by XRD, SEM and HRTEM data, and the good kinetics testified by CV and EIS data of the Ni-doped material are responsible to improve the high-rate capability and long cycle properties.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Wenwu Fu,Gang Wang,Kai Zhang,Jiafan Zheng,Chengyu Zhang,Jieyuan Wang,Junwei Li,Jun Zheng,Ming Zhang,Zhongrong Shen
Iron-based Prussian Blue Analogues (PBAs) are widely utilized in sodium-ion battery cathodes owing to their low cost and high theoretical capacity (170 mAh g −1 ). However, the electrochemical inactivity of low-spin iron (LS-Fe) significantly limits the operating voltage and capacity, thereby hindering the energy density of the battery. This study introduces a method for thermally activating the LS-Fe capacity of Prussian Blue Analogues under a nitrogen atmosphere. The results show that the LS-Fe capacity increases progressively with temperature. However, excessively high temperatures can lead to decomposition and oxide formation, which subsequently reduces the capacity. The sample thermally activated at 200 °C (PB-200) demonstrates the highest specific capacity of 119.86 mAh g −1 at 0.2C and optimal rate performance. Moreover, after 500 cycles at 5C, PB-200 retains 84.6 % of its initial capacity. In-situ Electrochemical Impedance Spectroscopy (EIS) and Galvanostatic Intermittent Titration Technique (GITT) measurements reveal a significant improvement in the diffusion process following heat treatment, attributed to phase changes during heating, resulting in lattice misalignment and crack formation. The full cell exhibits a stable capacity of 84.81 mAh g −1 at 0.2C. After 100 cycles at 1C, its capacity remains at 70.7 %.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Xiaofei Sun,Xiangguo Hou,Xuesong Mei,Yanbin Han,Bin Liu,Quansheng Li,Zikang Wang,Wei Tang,Yuping Wu,Wenjun Wang,Jianlei Cui
High-capacity rechargeable batteries are crucial for portable electronics, electric vehicles, and smart power grids. High-quality porous Al current collectors with well-designed hole size and hole density are expected to strengthen lithium transportation as well as to accommodate volume variations during fast charging and discharging. Ultrafast femtosecond laser drilling is exploited in this paper to fabricate 3D porous current collectors with precisely controlled hole size and porosity. With optimized laser processing parameters, a series of high-quality porous Al foils with different hole diameters and porosities are designed, simulated, and prepared to investigate their influence on the battery performance of the LiFePO4 electrode. The electrode using laser-drilled Al foil with a hole diameter of 60 μm and a porosity of 15% shows pretty high capacities at various charge/discharge rates. The performance improvement is ascribed to the large roughness and high surface area of the 3D Al foil, the strong connection between electrode materials and the porous current collector, the high loading density and efficient utilization of active materials, the good wettability and facile penetration of the electrolyte and, thus, the high Li+ diffusivity, and the buffering of volume/stress variation during charging/discharging in the 3D porous electrode.
研究领域:
材料科学
·
能源技术
·
电池工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yue Chen,Shaohua Zhang,Dongni Zhao,Zhixian You,Yubiao Niu,Liqiang Zeng,Nagarathinam Mangayarkarasi,Oleg V. Kolosov,Jianming Tao,Jiaxin Li,Yingbin Lin,Yongping Zheng,Long Zhang,Zhigao Huang
The widespread application of Li 4 Ti 5 O 12 (LTO) anode in lithium-ion batteries has been hindered by its relatively low energy density. In this study, we investigated the capacity enhancement mechanism of LTO anode through the incorporation of Na + cations in an Li + -based electrolyte (dual-cation electrolyte). LTO thin film electrodes were prepared as conductive additive-free and binder-free model electrodes. Electrochemical performance assessments revealed that the dual-cation electrolyte boosts the reversible capacity of the LTO thin film electrode, attributable to the additional pseudocapacitance and intercalation of Na + into the LTO lattice. Operando Raman spectroscopy validated the insertion of Li + /Na + cations into the LTO thin film electrode, and the cation migration kinetics were confirmed by ab initio molecular dynamic (AIMD) simulation and electrochemical impedance spectroscopy, which revealed that the incorporation of Na + reduces the activation energy of cation diffusion within the LTO lattice and improves the rate performance of LTO thin film electrodes in the dual-cation electrolyte. Furthermore, the interfacial charge transfer resistance in the dual-cation electrolyte, associated with ion de-solvation processes and traversal of the cations in the solid-electrolyte interphase (SEI) layer, are evaluated using the distribution of relaxation time, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Our approach of performance enhancement using dual-cation electrolytes can be extrapolated to other battery electrodes with sodium/lithium storage capabilities, presenting a novel avenue for the performance enhancement of lithium/sodium-ion batteries.
CAS / MDL:
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 48
·2412319
·
IF 27.4
Xitang Qian,Yuxiang Lyu,Siyu Zhou,Yican Qiu,Yan Sun,Yuan Yuan,Minhua Shao
Metal sulfides are increasingly favored as cathode materials in all-solid-state batteries (ASSBs) due to their high energy density, stability, affordability, and conductivity. Metal sulfides often exhibit capacities exceeding their theoretical limits, a phenomenon that remains not fully understood. In this study, it reveals that this phenomenon is primarily due to the sulfur decomposition from sulfide-based electrolyte. By employing the high-energy ball milling (HEBM) technique, the deposition of sulfide-based electrolyte onto sulfur is intentionally promoted, resulting in higher charge capacities compared to the discharge capacities and surpass theoretical limits of metal sulfides. Using chromium sulfide (Cr 2 S 3 ) as the active material, the sulfur decomposed from sulfide-based electrolyte transforms into lithium sulfide (Li 2 S) after discharge, resulting in an increased capacity by ≈439.6 mAh g −1 and improved cycling stability. Consequently, it demonstrates a specific capacity surpassing 1200 mAh g −1 with a capacity retention of over 80% after 650 cycles, maintaining cycling stability for more than 1900 cycles and achieving a Coulombic efficiency exceeding 99.9%. This versatile HEBM approach enables the fabrication of ASSBs utilizing various transition metal sulfides, such as molybdenum disulfide (MoS 2 ), niobium disulfide (NbS 2 ), and iron disulfide (FeS 2 ), all exhibiting over theoretical limited capacities and prolonged cycling capabilities.
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
Batteries-Basel
·
2024
·Vol. 10
·期 2
·44
·
IF 4.6
Shijiang He,Zidong Wang,Wenbo Qiu,Huaping Zhao,Yong Lei
Due to their high specific capacity and long cycle life, bimetallic sulfides are the preferred choice of researchers as anodes in sodium-ion batteries (SIBs). However, studies indicate that this class of materials often requires expensive elements such as Co, Sb, Sn, etc., and their performance is insufficient with the use of inexpensive Fe, V alone. Therefore, there is a need to explore the relationship between metal cations and anode performance so that the requirements of cost reduction and performance enhancement can be met simultaneously. In this work, a series of partially replaced sulfides with different cation ratios have been prepared by a hydrothermal method followed by heat treatment. By partially replacing Co in NiCo sulfides, all samples show improved capacity and stability over the original NiCo sulfides. As a result, the metal elements have different oxidation states, which leads to a higher capacity through their synergistic effects on each other. Mn-NiCoS with 10% replacement showed satisfactory capacity (721.09 mAh g−1at 300 mA g−1, 662.58 mAh g−1after 20 cycles) and excellent cycle life (85.41% capacity retention after 1000 cycles at 2000 mA g−1).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Tianli Meng,Zifang Chen,Xiaoxu Lai,Jiayi Xing,Chi Chen,Dan Sun
Prussian blue analogs (PBAs) show promise as cathodes for sodium-ion batteries due to their notable cycle stability, cost-effectiveness, and eco-friendly nature, yet the presence of interstitial water limits the specific capacity and obstructs Na + mobility within the material. Although considerable experimental efforts are focused on dehydrating water for capacity enhancement, there is still a deficiency of a comprehensive understanding of the low capacity of low-spin Fe resulting from interstitial water, which holds significance in Na + storage. This study introduces a novel gas-assisted heat treatment method to efficiently remove interstitial water from Fe-based PBA (NaFeHCF) electrodes and combines experiments and theoretical calculations to reveal the iron spin state regulation that is related to the capacity enhancement mechanism. This dehydration strategy significantly enhances battery capacity, especially the portion at higher voltages (3.4–4.0 V). The increase in capacity is attributed to the following factors: an enhanced proportion of Fe 2+ , reduced water content which facilitates faster charge transfer, and the activation of low spin Fe 2+ . The optimized NaFeHCF demonstrated impressive half-cell performance of retaining 87.3% capacity after 2000 cycles at a 5 C rate and achieving 100 mAh g −1 capacity over 200 cycles when being paired with hard carbon, exhibiting its practical potential.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Shuqi He,Yaozhi Liu,Hong Wu,Wenjun Zhao,Zhiqing Xue,Yue Zhang,Sibo Wang,Jing Wang,Xiao-Xia Liu,Xiaoqi Sun
Rechargeable aqueous Zn-MnO 2 batteries are promising for large-scale energy storage. A two-electron transfer reaction of MnO 2 /Mn 2+ is available for the cathode, delivering a high theoretical capacity of 616 mAh g −1 . However, this process requires protons, and its practical contribution in conventional mildly acidic zinc batteries is limited. Herein, an organic redox mediator of Tiron is demonstrated to realize dominant two-electron transfer energy storage in MnO 2 cathode materials. The reversible hydroquinone/benzoquinone redox couple of Tiron allows facile spontaneous chemical reaction with MnO 2 to generate Mn 2+ as well as electrochemical redox in zinc cells according to combined in situ/ex situ analysis. Theoretical calculations further reveal that Tiron reduces the energy required for Mn release from the MnO 2 lattice. Therefore, Tiron not only boosts the two-electron reaction of MnO 2 but also reactivates any dead materials. Thanks to these effects, the MnO 2 cathode achieves a high capacity of 525 mAh g −1 at 0.3 A g −1 , far exceeding 384 mAh g −1 in the baseline system. The lifespan also extends four times to 12 000 cycles at 5 A g −1 together with stable capacity retention. This work presents an effective strategy to encourage the high-capacity reaction path of MnO 2 cathodes in aqueous zinc batteries.
研究领域:
储能
·
电化学
·
材料科学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2024
·
IF 18.9
Shuai Cui,Ting Li,Donggang Tao,Daohong Zhang,Yuliang Cao,Fei Xu
Rechargeable magnesium batteries are a potential selection for large-scale energy storage technologies, but development of cathode materials is the major difficulty at present. Organic polyimides are promising magnesium battery cathodes with the open and amorphous frameworks as well as enhanced charge delocalization. However, only two carbonyls are redox-active out of four for each imide unit, which largely limits the capacity. Herein, a new polyimide containing disulfide bond is fabricated and studied as cathode for rechargeable magnesium batteries. This polyimide shows a high capacity beyond the traditional two-electron principle. A mechanism study demonstrates that carbonyl enolization and disulfide bond break/formation occur in the redox process, leading to formation/break of sulfur-oxygen bond. This sulfur-oxygen bond enhances enolization and electron delocalization, resulting in an improved capacity. Further theoretical computation indicates a charge transfer within this sulfur-oxygen bond. The two-electron reduction state exhibits quite low HOMO and LUMO energy levels, which makes the disulfide bonded polyimide have a higher tendency to accept more electrons and a higher oxidation stability after reduction.
研究领域:
储能材料
·
电化学
·
高分子化学
·
电池技术
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Bei Long,Xiaojie Liang,Yong Pei,Xiongwei Wu,Xianyou Wang,Man-Kay Law
Photo-rechargeable batteries can implement solar energy harvesting and storage simultaneously and have attracted strong interest from researchers. The development of photoactive electrodes is the key to promoting the development of high-performance photocells. Herein, a free-standing BiOI@MWCNTs film is developed as photoelectrode to achieve the effective separation of photogenerated electron-hole pairs for high-efficiency solar-electric-chemical energy conversion. Light can charge up photocells with a photoconversion efficiency of ∼1.3 %, as well as accelerate charge transfer without requiring any external bias voltage. Ex situ XRD and XPS tests prove that the enhanced electrochemical reaction kinetics can improve the chemical-electric energy conversion efficiency under illumination. The capacity of the proposed photocell can be increased by 10.6 % (from 195 mA h g –1 to 216 mA h g –1 at 0.2 A g –1 ) and 57.9 % (from 76 mA h g –1 to 120 mA h g –1 at 5.0 A g –1 ) in light condition, while exhibiting a cyclic life of up to 600 cycles. This work can help to deepen the understanding of photo-rechargeable batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
太阳能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）