RSC Advances
·
2021
·Vol. 11
·期 56
·35280-35286
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IF 3.361
Jingliang Xu,Xinhang Hu,Md Asraful Alam,Gul Muhammad,Yongkun Lv,Minghai Wang,Chenjie Zhu,Wenlong Xiong
Zn/MnO2 batteries, one of the most widely studied rechargeable aqueous zinc-ion batteries, suffer from poor cyclability because the structure of MnO2 is labile with cycling. Herein, the structural stability of α-MnO2 is enhanced by simultaneous Al3+ doping and lignin coating during the formation of α-MnO2 crystals in a hydrothermal process. Al3+ enters the [MnO6] octahedron accompanied by producing oxygen vacancies, and lignin further stabilizes the doped Al3+ via strong interaction in the prepared material, Al-doped α-MnO2 coated by lignin (L + Al@α-MnO2). Meanwhile, the conductivity of L + Al@α-MnO2 improves due to Al3+ doping, and the surface area of L + Al@α-MnO2 increases because of the production of nanorod structures after Al3+ doping and lignin coating. Compared with the reference α-MnO2 cathode, the L + Al@α-MnO2 cathode achieves superior performance with durably high reversible capacity (∼180 mA h g−1 at 1.5 A g−1) and good cycle stability. In addition, ex situ X-ray diffraction characterization of the cathode at different voltages in the first cycle is employed to study the related mechanism on improving battery performance. This study may provide ideas of designing advanced cathode materials for other aqueous metal-ion batteries.
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
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wangqiong Xu,Yonghui Zheng,Yan Cheng,Ruijuan Qi,Hui Peng,Hechun Lin,Rong Huang
It is well known that the electrochemical performance of spinel LiMn2O4 can be improved by Al doping. Herein, combining X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and spherical aberration-corrected scanning transmission electron microscopy (Cs-STEM) with in situ electron-beam (E-beam) irradiation techniques, the influence of Al doping on the structural evolution and stability improvement of the LiMn2O4 cathode material is revealed. It is revealed that an appropriate concentration of Al3+ ions could dope into the spinel structure to form a more stable LiAlxMn2–xO4 phase framework, which can effectively stabilize the surface and bulk structure by inhibiting the dissolution of Mn ions during cycling. The optimized LiAl0.05Mn1.95O4 sample exhibits a superior capacity retention ratio of 80% after 1000 cycles at 10 C (1 C = 148 mA h g–1) in the voltage range of 3.0–4.5 V, which possesses an initial discharge capacity of 90.3 mA h g–1. Compared with the undoped LiMn2O4 sample, the Al-doped sample also shows superior rate performance, especially the capacity recovery performance.
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
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Wangqiong Xu,Qiling Li,Fengrui Sui,Shimei Guo,Ruijuan Qi,Cuiqiong Yan,Lijuan Chen,Shubiao Xia,Junming Guo,Zhe Li,Rong Huang,Feixiang Cheng
Ni doping is a commonly used strategy to improve the electrochemical performance of LiMn 2 O 4 . Uncovering the structural changes of Ni-doped LiMn 2 O 4 during electrochemical cycling, particularly at the atomic level, is important to understand the mechanism of the relationship between Ni doping and performance improvement. Herein, we investigate the chemical and structural evolutions of the Ni-doped LiMn 2 O 4 electrodes before and after 1000 cycles at 10 C with atomic resolution and correlate them with changes in the electrochemical properties . We found that Ni 2+ ions doped into the Mn 16d sites to form a more steady LiNi x Mn 2-x O 4 phase construction, which can effectively stabilize the spinel structure by hindering Jahn − Teller distortion. Comprehensive atomic imaging demonstrated that Ni doping can suppress the formation of the unexpected Mn 3 O 4 , and rock-salt MnO phases on the surface and subsurface of LiMn 2 O 4 during cycling, which is conducive to stabilizing the MnO 6 octahedron and inhibiting the migration of Mn. Resultantly, splendid long cycling stability of 88.92 % after 1000 cycles at 10 C (1 C = 148 mAh g −1 ) for the optimized LiNi 0.05 Mn 1.95 O 4 sample is presented. Our study provides an ingenious avenue for regulating the surface optimization and reconstruction of electrode materials .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Shouyi Yin,Hongyi Chen,Jun Chen,Abouzar Massoudi,Wentao Deng,Xu Gao,Shu Zhang,Ying Wang,Tsung-Wu Lin,Craig E. Banks,Shi-zhang Qiao,Guoqiang Zou,Hongshuai Hou,Xiaobo Ji
The implementation of Ni-rich cathodes with high energy density has been critically restrained by stress corrosion. Herein, crack-free LiNbO3-coated LiNi0.88Co0.10Mn0.02O2, as theoretically predicted, demonstrates highly reversible lithiation/delithiation. Mechanically, the phase transition (H1 → H2 → H3) is significantly alleviated by the excogitation of the interfacial force invoked by the LiNbO3 coating layer, as verified by X-ray absorption spectroscopy and extended X-ray absorption near-edge structure spectroscopy. Meanwhile, the stabilities of the crystal structure are remarkably strengthened by the strong Nb–O bond activated by Nb5+ doping that is confirmed by Rietveld refinement of X-ray diffraction and differential capacitance curves. Chemically, the interface shielding effect is conducive to protecting the electrode against electrolyte corrosion along with subsequent transition-metal dissolution, ultimately rendering a faster/highly convertible lithium-ion diffusion. Greatly, the excellent electrochemical properties (74% capacity retention after 300 cycles at 2 C within 2.5–4.3 V) and structural stability (the morphology remains intact after 500 cycles at 5 C within 2.5–4.3 V) are successfully achieved. Given this, this elaborate work might inaugurate a potential avenue for rationally tuning the structure/interface evolution toward Ni-rich materials.
研究领域:
材料科学
·
电化学
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能源存储
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Ziyan Wu,Qiqi Zhang,Binghan Li,Zhifang Shi,Kaimin Xu,Yi Chen,Zhijun Ning,Qixi Mi
All-inorganic metal halide perovskites are noted for their excellent optoelectronic properties and good chemical stability but also a propensity to transform into nonperovskite phases. A case in point is lead-free CsSnCl3, whose perovskite Phase I is metastable at room temperature and could not be stabilized by partial substitution of Cs+ or Cl–. Judging from the radii of the constituent ions of CsSnCl3, we paid attention to octahedral cations smaller than Sn2+ and selected Mn2+ and In3+ for substitution at the B-site. A quantitative structural indicator, volume per formula unit (V/Z), guided the syntheses of CsSn0.9Mn0.1Cl3 (CTMC) and CsSn0.9In0.067Cl3 (CTIC), which are shown by single-crystal X-ray diffraction and differential scanning calorimetry to be homogeneous, stable perovskite phases at room temperature. CTMC turns into a disordered perovskite structure at 193 K, lower than the corresponding transition temperature of CsSnCl3 by nearly 100 K. Vacancies in CTIC result in a more flexible crystal structure than CTMC and CsSnCl3. CTMC and CTIC appear bright yellow with a steep absorption edge at ∼450 nm, and their photoluminescence peaks are located at 645 and 484 nm, respectively, with intensities significantly enhanced from CsSnCl3. Energy transfer processes are proposed to account for the Stokes shifts in the photoluminescence of CTMC and CTIC. Thin films of CTMC glow red under ultraviolet excitation and hold promise for electroluminescence devices. This study gives insights into the structural and electronic effects of ionic substitution in CsSnCl3 and can be extended to other metastable perovskite phases.
研究领域:
材料科学
·
光电
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固体化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Shuyu Zhou,Junhong Liao,Chenglong Yu,Pengpeng Dai,Tong Gao,Tingzheng Hou,Guozhong Cao,Shixi Zhao
The Jahn–Teller (JT) deformation triggers severe structural distortion and large capacity fading in the cathode materials of alkali-ion batteries. Although conventional doping containing over 20 dopant species has been demonstrated to suppress the JT effect, how the short-range and cooperative JT effect are regulated remains an open question. Recently, the new compositionally complex (high entropy) doping has been validated in various oxide cathodes and achieved “zero strain”, but the reported “synergistic effect” is largely factual reporting with a limited fundamental understanding of the link between multicomponents and the JT effect. By comparing a group of spinel LiMn2O4 (LMO) cathodes with tridoping sites containing one, three, or five dopants’ species, the present work shows that MnO6 octahedral distortion systematically decreases, whereas capacity retention and structure stability systematically increase as the number of dopants’ species increases. We propose the generality rules that Mn-site doping breaks the linear continuous short-range JT distortion while 16c-sites doping disturbs the dz2-orbital collinear ordering and mitigates the cooperative JT effect. Moreover, our complex doping strategy further buffers and rotates the JT strain, resulting in isotropic moderate volume distortion. Based on this synergic effect, both the short-range and cooperative JT effect are significantly suppressed in our synthesized multisites multicomponent doped LMO.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Lun Ma,Qiming Liu,Huijuan Zhu,Yilin Wang,Han Su,Jie Wang
Na₄Fe₃(PO₄)₂(P₂O₇) (NFPP) has attracted growing interest as a cathode material for sodium-ion batteries (SIBs) because of its non-toxic nature, economic cost, and robust structure. However, its practical application is limited by relatively poor electronic conductivity, which affects its electrochemical performance. The introduction of Al³⁺ ions, characterized by their smaller ionic radius, leads to lattice contraction. This not only minimizes lattice distortion during the sodium ion transport process but also significantly enhances the structural stability of the material. Furthermore, coating the material with a carbon layer significantly boosts its electrical conductivity. Consequently, the optimized NFPP exhibits superior sodium-ion diffusion, enhanced electronic conductivity, and improved structural integrity. Research findings show that the formulated non-stoichiometric, carbon-coated Na₄.₄Fe₃.₄Al₀.₁(PO₄)₂.₅P₂O₇/C cathode delivers exceptional electrochemical performance.It achieves a high specific capacity of 133 mAh g⁻¹ at 0.2 C, maintains good rate capability with 91 mAh g⁻¹ at 20 C, and shows excellent cycling stability, preserving 88 % of its initial capacity after 2500 cycles at 50 C.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Tiantian Wang,Lei Ni,Xu Sun,Hejie Lu,Haiqiang Li,Maosen Fu,Xiao Ma
Co-free binary cathode materials (LiNixMn1−xO2, x ≥ 0.5) are promising candidates for lithium-ion batteries (LIBs) due to their high specific capacity and low cost. The degradation of the low-temperature electrochemical performance of these materials not only hinders their practical application but also emerges as a critical research focus in energy storage technologies. In this work, the effect of Sm doping on the structure and electrochemical performance of LiNi0.55Mn0.45O2 (NM5545) cathode materials (x% Sm-NM5545, x = 0, 0.5, 1.0, 1.5) is systematically investigated over a wide temperature range (−10 to 45 °C). Sm doping significantly enhances the structural stability and enlarges interlayer spacing, which likely facilitates Li+ transport. Compared with undoped NM5545, the 1.0% Sm-NM5545 cathode materials exhibit remarkable improvements in capacity retention, which increases by 14.1%, 8.0%, and 9.4% after 100 cycles at temperatures of −10 °C, 25 °C, and 45 °C (1.0C, 3.0–4.45 V), respectively. Meanwhile, the discharge-specific capacity of 1.0% Sm-NM5545 cathode materials increases by 7.9 mA h g−1, 9.1 mA h g−1, and 12.9 mA h g−1 at the above respective temperatures. Electrochemical impedance spectroscopy and galvanostatic intermittent titration technique analyses confirm that Sm doping has enhanced the lithium-ion migration rate while reducing the charge transfer resistance in the modified materials. Furthermore, post-cycling characterization via scanning electron microscopy and X-ray photoelectron spectroscopy reveals that Sm doping effectively reinforces the structural integrity, suppresses crack propagation during high voltage cycling, and inhibits detrimental cathode–electrolyte interfacial reactions.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Yang Jian,Zhang Yaowen,Liu Yongping
The oxygen evolution reaction (OER), serving as the anode in water electrolysis, plays a pivotal role in various applications. Developing efficient non-iridium-based catalysts for acidic water splitting remains a significant challenge. This study employs a phase engineering strategy to synthesize defect-rich crystalline/amorphous Ru 0.6 Mo 0.2 Cr 0.2 O x solid solution catalysts through dual-metal doping. The catalyst exhibits superior acidic OER performance with an overpotential of 204 mV (@10 mA cm −2 ) and mass activity of 577.8 A g Ru −1 at 1.5 V vs RHE, outperforming all control samples. Furthermore, synergistic Cr/Mo doping effectively reduces the oxidation state of Ru in RuO 2 while enhancing structural stability, resulting in minimal activity decay during prolonged testing. Theoretical calculations reveal that dual-doping synergistically modulates charge distribution on Ru sites, lowering the energy barrier for *OOH formation in the thermodynamic limiting step. This work provides a facile strategy for developing high-performance acidic OER catalysts with dramatically reduced noble metal loading, demonstrating critical industrial relevance.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2024
·
IF 24.4
Gongzheng Yang,Kaixuan Ma,Chengxin Wang
Manganese oxide is among the most promising cathode materials for rechargeable aqueous zinc-ion batteries due to its abundant reserves, low toxicity, and high theoretical capacity. However, the occurrence of Mn dissolution and structural collapse during the charge and discharge process, as well as the hydrogen evolution reaction, zinc dendrite formation, and corrosion on the anode surface, have seriously hindered practical applications. Here, a novel cathode material design is proposed intended to enhance both cathode and anode stability simultaneously. Specifically, an inherently stable CuMn 2 O 4 is employed as cathode material, which demonstrates good maintenance of its spinel structure during cycling. Interestingly, insertion of Zn 2+ -ions leads to the extraction of Cu 2+ -ions from CuMn 2 O 4 , subsequently in situ reduces to Cu 0 , which results in extra capacity and improves electrical conductivity. The migration of Cu 2+ ions into the Zn anode surface during the charge process eventuated the formation of copper–zinc alloys via electrodeposition. Moreover, the reconstructed anode exhibits superior stability and corrosion resistance during the Zn plating-stripping process. Consequently, the CuMn 2 O 4 electrode demonstrates a markedly improved cycle capability compared to the spinel Mn 3 O 4 electrode. This study highlights an unconventional copper electrochemistry in aqueous Zn-Mn batteries and introduces a new design principle for high-performance aqueous zinc-ion batteries.
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
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Qian Peng,Wanling Zhong,Kun Liu,Yingjie Zhang,Jiajie Xing,Xuekun Tang
The preparation of monolithic catalysts with excellent catalytic performance and stability for the continuous purification of organic wastewater remains a challenge in the field of advanced oxidation processes based on sulfate radical (SR-AOPs). In this work, a series of catalysts (AP-X/Si-Co) with macroscopic dimensions (0.5–1 mm) were prepared by regulating the surface properties of alumina spheres (AP) through pre-calcination and sodium silicate modification. Optimized surface acidity by pre-calcination and sodium silicate modification induces the formation of Co 2 AlO 4 and increase the content of Co 3+ in the octahedral coordination, which are responsible for excellent catalytic performance. Meanwhile, the Si-O-Al bond and enlarged pore size endow the catalyst with excellent structural stability and reusability. In the continuous catalytic degradation experiment, the degradation ratio of p-nitrophenol (PNP) can still approach 50% in AP-1000/Si-Co/PMS system the mass ratio of simulated wastewater to catalyst dosage reaches to 4500. This study provides a simple, reliable, and effective method for preparing monolithic catalysts for organic matter degradation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yujue Wang,Yilin Wang,Xianghao Tang,Lei Zhang,Dan Xiao,Xicui Zhang,Qian Zhao
Mn/Fe-based layered oxides are supposed to be suitable as low-cost cathode materials for sodium ion batteries (SIBs) since they are of high specific capacity and wide availability of Mn and Fe sources in nature. However, these materials generally suffer from complex and irreversible phase transitions. The manufacture of high entropy materials can solve these matters. Herein, we rationally design and synthesized high entropy doped P2-Na 0.62 Ca 0.03 Mn 0.58 Fe 0.23 Cu 0.085 Mg 0.01 Ti 0.015 Li 0.08 O 2 (NFM-HEO) material. As cathode for SIB, it exhibits enhanced long cycling stability and better rate capability compared to the undoped P2-Na 0.65 Mn 0.6 Fe 0.4 O 2 material within 2.0 ∼ 4.3 V. After 500 cycles at 1C, the capacity retention rate reaches 85.4 %, and it can provide a reversible specific capacity of 134 mAh g −1 at 0.1C and 70 mAh g −1 at 5C. In-situ XRD, diffusion kinetics results together with microstructure and phase characterization before and after cycling indicate that high entropy doping enhances structural stability of layered oxides, suppresses irreversible phase transitions, stabilizes Na + diffusion paths, ensures reversible anionic redox reactions, inhibits crack generation after cycling, prevents transition metal dissolution, and improves humid air stability. This study is expected to offer guidance for the improvement of structural stability of layered cathode for SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）