Journal of Physical Chemistry C
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2020
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IF 4.189
Ningyun Hong,Kang Wu,Zhengjun Peng,Zenghu Zhu,Guofeng Jia,Min Wang
O3-type layered transition metal oxides have shown great promise as high-capacity cathode materials for sodium-ion batteries in large-scale energy storage, due to their low cost and the abundance of sodium resources. However, the limited interlayer spacing and the unstable structure of the O3 phase result in inferior cycling stability and poor rate capability, which could even hinder their practical application process. Hereby, we present that doping with nonelectrochemically active Al in NaAlx(Ni0.5Mn0.5)1–xO2 (x = 0, 0.02, 0.06, 0.1) can effectively alleviate these issues. Among these materials, materials with x = 0.02 exhibited the best electrochemical behavior with improved capacity and better cycling property than other materials. Specifically, the discharge capacity of a 2 mol % Al-doped material possesses 63.2% capacity retention after 200 cycles at a current density of 240 mA g–1, which is 21.4% higher than that in NaNi0.5Mn0.5O2. In addition, a 2 mol % Al-doped electrode also shows outstanding rate capability and delivers 90 mAh g–1 at a high rate of 480 mA g–1, compared to only 67 mAh g–1 for that of the pristine one. X-ray diffraction (XRD), cyclic voltammetry (CV), and galvanostatic intermittent titration technique (GITT) analysis elucidated that the introduced Al dopant can effectively improve the structural stability and promote kinetics of Na+ diffusion mobility. Therefore, the strategy of doping inactive aluminum elements for optimizing the electrochemical performance of NaNi0.5Mn0.5O2 was verified, which could also open an avenue for the design of other O3-type sodium cathode materials.
研究领域:
材料科学
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电化学
·
能量存储
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Linying Yang,Shuwei Sun,Kai Du,Huiling Zhao,Dong Yan,Hui Ying Yang,Caiyan Yu,Ying Bai
Layered O3 type oxides exhibit promising prospects as high-performance cathodes for sodium-ion batteries (SIBs) due to their low cost and high theoretical capacities. Nevertheless, the intrinsic surface composition and bulk structure degradation upon cycling presents a huge obstacle to stable sodium-ion storage/transportation. Besides, the effective surface decoration on layered O3 oxides is still challenging through conventional wet chemical route owing to their extraordinarily high surface sensitivities. Herein, a typical O3 type layered oxide of NaNi 0.5 Mn 0.5 O 2 (NNMO) was selected and successfully encapsulated by precisely controlled Al 2 O 3 layers via atomic layer deposition (ALD) technology. With the optimally controlled Al 2 O 3 thickness of 3 nm, the surface regulated NNMO delivers a highly reversible capacity of 73.6 mA h g -1 , with a significantly improved capacity retention of 68.0% after 300 cycles at 0.5 C, and a superior rate capability of 65.8 mA h g -1 at 10 C. Further air sensitivity tests demonstrate that the protective layer could effectively mitigate the generation of sodium-based impurities on NNMO, and reduce the surface sensitivities. Both chemical and electrochemical aging tests confirm the contribution of Al 2 O 3 coating layer in alleviating ion dissolution as well as stabilizing the structure and morphology of NNMO. Based on regulating the surface of O3 type layered oxides utilizing ALD technique, this work supplies an effective and facile strategy to overcome the challenges from fast structure degradation and electrochemical property decay, which not only highlights the significance and effectiveness of surface engineering in secondary batteries, but also sheds light on accurate interface construction and regulation for active electrode materials, particularly for those sensitive to ambient atmosphere.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Caiyan Yu,Linying Yang,Shuwei Sun,Di Chen,Yanfeng Yin,Hui Ying Yang,Ying Bai
Due to their high theoretical specific capacities and good structural compatibility, O3-layered oxides are considered as high-performance cathode candidates for sodium-ion batteries. However, serious side reactions and structural degradation during long-term cycling have greatly hindered their practical applications. Herein, O3-type NaNi 0.5 Mn 0.5 O 2 (NNMO) was prepared by partially substituting Ni 2+ with Cu 2+ and inducing CuO surface coating to enhance the structural stability without sacrificing the high capacity. In Particular, Cu 2+ incorporated at a molar ratio of 0.10 greatly improved the electrochemical performance of pristine NNMO. The NaMn 0.5 Ni 0.4 Cu 0.1 O 2 electrode exhibited a capacity retention of 64.5% after 300 cycles at 0.5 C. Microscopic and spectral studies revealed that the CuO coating layer suppressed detrimental side reactions upon cycling. Moreover, the bulk doping of Cu 2+ ultimately enhanced the structural stability by mitigating irreversible phase transitions. Hence, the integration of bulk Cu 2+ doping and CuO surface coating contributed to the increased structural stability and electrochemical performance of NNMO. The doping and coating dual-modification strategy established in this work effectively suppressed the side reactions and structural degradation of NNMO, and this work provides new insight into the effective design of electrode microstructures for use in high-performance batteries.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Energy Storage Materials
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2023
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IF 20.4
Bo Peng,Yanxu Chen,Liping Zhao,Suyuan Zeng,Guanglin Wan,Feng Wang,Xiaolei Zhang,Wentao Wang,Genqiang Zhang
The O3-type layered oxides featuring sufficient Na reservoir have been extensively investigated as promising cathode candidates for sodium-ion batteries. However, the complicated phase transitions derived fast capacity decay has severely impeded its practical applications. Herein, we present a scalable yet feasible strategy to tune the local chemical environment in O3-NaNi 0.5 Mn 0.5 O 2 via Al 3+ doping for dramatically enhancing its electrochemical properties. Specifically, the modulated O3-NaNi 0.45 Al 0.1 Mn 0.45 O 2 cathode raises the capacity retention rate from 40.9% to 86.2% within 200 cycles at a current density of 85 mA g −1 . Combining theoretical calculation and experimental characterizations, it is confirmed that the Al 3+ doping induced reinforcement of transition metal-oxygen bonds and enlargement of Na layer distance can simultaneously inhibit the complicated phase transitions and decrease the Na + diffusion energy barrier, which are responsible for the impressive performance improvement. Importantly, the full-cell device based on this unique cathode and commercial hard carbon anode can deliver a high energy density of 213.5 Wh kg −1 , suggesting its great potential of practicability. This work provides a new insight in finely designing high performance layered oxide cathode for sodium ion batteries, which advances the next generation of cost-effective yet grid-level energy storage systems.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
IONICS
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2026
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IF 3.4
Xie Yi,Luo Qingsong,Han Lina,Yu Lingxin,Li Baolong,Zeng Xiaoyuan,Zhang Yingjie,Dong Peng
Layered O3-type oxides have attracted significant interest as high-capacity cathode materials for sodium-ion batteries, owing to their ample sodium storage and competitive energy density. However, their practical implementation is hindered by irreversible phase transitions and sluggish Na + diffusion kinetics, leading to rapid capacity decay. Herein, we realize a unique dual-spacing modulation in O3-NaNi 0.5 Mn 0.5 O 2 cathodes via rational Cu substitution to effectively mitigate these intrinsic challenges. Comprehensive structural characterization reveals that this targeted modulation simultaneously expands the Na + layer spacing to facilitate ionic transport and contracts the transition metal slabs to enhance structural coherence. Consequently, the optimized NaNi 0.45 Mn 0.5 Cu 0.05 O 2 electrode delivers a high reversible capacity of 129.0 mA h g − 1 at 0.5 C, with exceptional cycling stability (83.3% capacity retention after 100 cycles) and outstanding rate capability (94.6 mA h g − 1 at 5 C). Furthermore, even within an extended voltage window (2.0–4.3 V), the material maintains a retention of 69.3% due to enhanced structural integrity. When paired with a commercial hard carbon anode, the resulting full cell demonstrates performance analogous to the half-cell configuration, underscoring its promising potential for large-scale commercialization. Graphical
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产品关联
DOI
高影响因子
Nanoscale
·
2025
·Vol. 17
·期 17
·10910-10921
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IF 5.1
Peng Sun,Chenhui Wang,Jing Liu,Jie Liao,Yaohan Fei,Ziyan Zhang,Ning Nie,Jiangjiexing Wu,You Han,Jinli Zhang,Wei Li
To enhance the electrochemical performance of NaNi0.5Mn0.5O2 (NM) cathode material for sodium-ion batteries, a novel indium-intercalated NaNi0.5−xMn0.5InxO2 cathode material enriched with oxygen vacancies was first synthesized via a high-shear co-precipitation method. Subsequently, a thin Si-containing protective layer was produced on the surface through the interfacial reaction between oxygen vacancies and tetraethyl orthosilicate. Results of performance evaluation and characterization tests, including in situ XRD, Ar+ sputtering XPS, and HAADF-STEM, indicated that the optimal sample Siy@NaNi0.497Mn0.5In0.003O2−y exhibited superior initial discharge capacity of 125.0 mA h g−1 (0.1 C) and excellent capacity retention of 98.4% after 100 cycles at 1 C. In particular, the Si@In-doped sample offered larger lattice spacing, higher Na+ diffusion rate and better conductivity than the In-intercalated sample and pristine NM. DFT calculations illustrated that In preferentially substituted the Mn site, while Si preferred to substitute the Ni site closer to the In-intercalating location. The Na+ diffusion energy barrier was greatly reduced with In intercalation and Si doping. Such a facile strategy to augment the lattice spacing of the O3-layer cathode while producing a thin protective layer using the oxygen vacancies on the surface has promising applications to explore new cathode materials with high electrochemical performance for sodium-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
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