Materials Today Nano
·
2021
·
IF 8.109
P. Zhang,C. Xie,G. Han,Q. Zhu,L. Chen,M. Jin,Q. Liu,Y. Zhou,Q. Sun,J. Xie
Chemical/electrochemical instability of LiCoO 2 (LCO) at high voltage limits its deliverable capacity and thereby energy density of the battery , although it has a high theoretical capacity of 274 mAh/g. In this study, stable cycling of LiCoO 2 at a voltage as high as 4.55 V can be achieved by simultaneous lattice doping with Mg (LMCO) and surface coating with a NASICON-type Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) solid-state electrolyte. Uniform coating can be realized by a facile Pechini route combined with solid-phase calcination . The LCO with 4 wt% LATP coating and 2 at% Mg doping (4 wt% LATP/LMCO-0.02) can deliver a high capacity of 204 mAh/g in the voltage range of 3.0–4.55 V (vs. Li/Li + ) at 0.4C. After 300 cycles at 0.4C, the 4 wt% LATP/LMCO-0.02 material can maintain 86.2% of its initial capacity, significantly superior to those of undoped and/or uncoated materials. The results show that both doping and coating are critical in inhibiting structural change of LCO and electrolyte decomposition at a deeply charged state of LiCoO 2 material.
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
Zhenbo Wang,Xiaoyan Guo,Guowei Zhang,Lu Sai,Hongzhe Wang,Ying Bai,Huiling Zhao
Li-rich oxides are one kind of promising cathodes for the advanced lithium-ion batteries owing to ultrahigh specific discharge capacity and low cost. Whereas, their high energy density stemmed from oxygen anion redox easily triggers irreversible phase transition and oxygen release, simultaneously companied with low initial Coulombic efficiency, rapid capacity degradation and poor cycling stability. Herein, an integrated strategy of Li 0.35 La 0.55 TiO 3 (LLTO) coating and Ti 4+ /La 3+ dual-element doping is introduced to improve the electrochemical performances of Li 1.2 Mn 0.56 Ni 0.17 Co 0.07 O 2 (LMNCO) via facile sol-gel method and annealing treatment. Various characterizations including in-situ XRD and DEMS demonstrate that LLTO coating can accelerate Li + diffusion and alleviate side reactions at cathode-electrolyte interface, meanwhile Ti 4+ /La 3+ -doping can stabilize lattice oxygen and restrain oxygen release in the charge-discharge process. Electrochemical test results manifest that the LLTO-modified LMNCO cathode exhibits excellent rate property and long-term cycling stability, e.g. , a discharge capacity of 153.6 mAh g −1 at 5C, and a superior capacity retention of 83 % after 400 cycles at 1C. This work presents one simple strategy for the modification of Li-rich material to rationally utilize TM cationic and oxygen anionic redox reactions, and to promote the electrochemical performance and structure stability of layered-structure cathode in long-term cycling even under elevated temperature.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lifeng Zhang,Yaoxin He,Jiaxi Bai,Fenghua Liu,Robert Bradley,Weiping Wu,Xingang Kong,Shouwu Guo
Addressing the slow electrochemical kinetics and electrode pulverization of sodium ion batteries (SIBs) is needed to continuously develop advanced anode materials . Molybdenum telluride (MoTe 2 ) is considered promising for SIBs anodes due to its wider interlayer distance , faster electronic conductivity , and weaker interlayer force. However, the nanoparticle aggregation and layered structure collapse caused by bond breakage weaken its inherent advantages for excellent sodium storage performance. Herein, hierarchically nanostructured regulation and surface coating of MoTe 2 based SIB anodes are simultaneously achieved by employing Mo-PDA as precursors through a concise and effective method containing chelation, preoxidation and tellurization. The microstructure and morphology of MoTe 2 /C composites can be facilely regulated by controlling the chelation time and tellurization temperature. The as-synthesized MoTe 2 /C-6h-600 electrode exhibits encouraging Na + storage performance, which delivers discharge capacitances of 290.7 mAh g −1 (0.1 A g −1 ) and 161.1 mAh g −1 (1.0 A g −1 ) after hundreds and thousands cycles, respevtively. Furthermore, the assembled full cell of MoTe 2 /C-6h-600//NVP delivers a stable reversible capacitance of 103 mAh g −1 , which is promising for future practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Zheming Chen,Ming Gu,Feng Wang,Chong Gao,Peng Liu,Yanfen Ding,Shimin Zhang,Mingshu Yang
Titanium dioxide (TiO 2 ) has been widely used as the white pigment in paintings and coatings. It is of significance to endow TiO 2 powders with the high conductivity to extend its application. In this research, rutile TiO 2 nanorods were prepared as the substrate material. Further the surface coating by antimony doped tin dioxide (Sb SnO 2 ) shell layers was achieved to obtain conductive TiO 2 nanorods . The morphology and structure of TiO 2 @Sb SnO 2 nanorods was mainly focused on to obtain high conductivity by optimizing the calcination temperature. When the temperature was properly applied at nearly 500 ° C, the calcination led to the fusion and attachment of Sb SnO 2 crystalline regions on the surface of TiO 2 nanorods, forming a continuous intact coating layer and thus getting lower volume electrical resistivity of the composite nanopowder . However, after calcination at 600 °C or higher temperature, the integrity of Sb SnO 2 shell layers would be destroyed, resulting in the increased electrical resistivity. The conductive TiO 2 nanorods obtained at the optimized reaction condition showed a very low resistivity of 52 ± 1.6 Ω cm, in contrast to 10 5 Ω cm of the pure TiO 2 . The conductive TiO 2 nanorods would be excellent candidate for antistatic or electromagnetic shielding applications in coatings.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Yiping Sun,Houcai Dong,Kuan Wu,Xi Chen,Shaofei Wang,Wei Gu,Ziwei Hong,Min Liu,Yanbin Shen,Wei Lu
Surface coating is an efficient strategy to enhance the interfacial stability of the electrode. Graphene quantum dots (GQDs) have advantages of excellent dispersion in water, outstanding electron and ion conductivities and high specific surface area. In this work, GQDs were coated directly on the surface of LiCoO 2 particles (GQDs-LiCoO 2 ) through liquid phase method. Compared to bare LiCoO 2 , the cycling performance, rate capacity and thermo-stability of the GQDs-LiCoO 2 have been significantly improved in the voltage range of 3.04.5 V. GQDs-LiCoO 2 showed a much higher capacity retention than that of bare LiCoO 2 (82.8 % vs 46.1 %) after 100 cycles at 0.5 C. The excellent improvement of the GQDs-LiCoO 2 was mainly attributed to the formation of a uniform, stable, dense and well-conductive protective layer on the surface of LiCoO 2 particles by the surface coating of GQDs. The detailed analysis of the cycled electrodes reveals that the GQDs coating stabilizes the crystal structure of LiCoO 2 and suppresses undesirable interfacial side reactions between the cathode and electrolyte, leading to the improvement of battery performance.
研究领域:
材料科学
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电化学
·
能源存储
·
锂离子电池
·
界面工程
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Yi Hao,Xiaoyi Chen,Kaili Wang,Xingyan Wang,Long Zhang,Haiyan Jing,Ruixia Gao,Sicen Wang
Background Perfluorooctane sulfonate (PFOS) is a persistent organic pollutant with significant risks to ecosystems and human health. Magnetic molecularly imprinted polymers (MIPs) provide a promising solution for selectively extracting PFOS from contaminated water. However, while bifunctional monomer imprinting improves the imprinting effect by introducing diverse functional groups, it can also increase non-specific adsorption. To address this problem, a surface cladding strategy was applied after polymerization, forming an inert cladding layer to reduce non-specific binding and improve specificity. Results The magnetic MIPs with a cladding layer (Fe 3 O 4 @PFOS-cMIPs) exhibited enhanced adsorption performance, achieving a high adsorption capacity of 135.1 mg g -1 , an imprinting factor of 3.19, and a selectivity factor greater than 1.3, surpassing most reported PFOS-MIPs. The interactions between Fe 3 O 4 @PFOS-cMIPs and PFOS were confirmed to be a synergistic combination of electrostatic and hydrophobic interactions, as evidenced by FTIR analysis, zeta potential measurements, and pH studies. Additionally, Fe 3 O 4 @PFOS-cMIPs demonstrated excellent reusability, with stable performance across six adsorption-desorption cycles using a regeneration solution of acetone and NaCl. Furthermore, when coupled with LC-MS, Fe 3 O 4 @PFOS-cMIPs successfully detected trace levels of PFOS in complex environmental water samples. The method demonstrated high precision (RSD, 6.0%), excellent recoveries (90.9% - 103.3%), a low limit of detection (LOD, 0.06 ng L -1 ), and an enrichment factor of 299. Significance This study presents a practical and efficient strategy for developing magnetic MIPs with enhanced molecular recognition. The enhanced specificity and adsorption capacity highlight the strong potential of these MIPs for the targeted extraction of PFOS from various contaminated water sources, offering significant contributions to environmental analysis and remediation.
研究领域:
环境科学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 20
·e202300517
·
IF 8.4
Guozhong Lu,Ying Jiang,Xiang Wu,Fushan Geng,Chao Li,Bingwen Hu,Ming Shen
Graphical Simultaneous surface coating with Li 2 TiO 3 /Li(TiMg) 1/2 O 2 and bulk Mg-doping for LiCoO 2 is proposed to achieve long-life Li 10 GeP 2 S 12 -based ASSLBs. The Li 2 TiO 3 /Li(MgTi) 1/2 O 2 coating layers effectively suppress the interface side reactions and the space charge layer effect. The gradient Mg doping stabilizes the lattice structure of LiCoO 2 under local overcharging. Interfacial side reactions and space charge layers between the oxide cathode material and the sulfide solid-state electrolytes (SSEs), along with the structural degradation of the active material, significantly compromise the electrochemical performance of all-solid-state batteries (ASSLBs). Surface coating and bulk doping of the cathodes are considered the most effective approaches to mitigate the interface issues between the cathode and SSEs and enhance the structural integrity of composite cathodes. Here, a one-step low-cost means is ingeniously designed to modify LiCoO 2 (LCO) with heterogeneous Li 2 TiO 3 /Li(TiMg) 1/2 O 2 surface coating and bulk gradient Mg doping. When applied in Li 10 GeP 2 S 12 -based ASSLBs, the Li 2 TiO 3 and Li(TiMg) 1/2 O 2 coating layers effectively suppress interfacial side reactions and weaken space charge layer effect. Furthermore, gradient Mg doping stabilizes the bulk structure to mitigate the formation of spinel-like phases during local overcharging caused by solid-solid contact. The modified LCO cathodes exhibit excellent cycle performance with a capacity retention of 80 % after 870 cycles. This dual-functional strategy provides the possibility for large-scale commercial implementation of cathodes modification in sulfide based ASSLBs in the future.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 12
·1-13
·
IF 2.8
Guo Xueyi,Cai Haiyan,Mao Gaoqiang,Jiao Wen,Yu Wanjing,Meng Kui,Tong Hui,Xu Kaihua,Zhang Kun,Zhang Yuping
Developing battery materials with high specific energy and long cycle life is a crucial core technology that needs to be broken. High-nickel and high-voltage are the development trends of cathode materials, but the structural instability seriously deteriorate electrochemical performance. Herein, to solve the above problem and obtain structurally stable high-voltage nickel-rich cathode materials, a novel high-voltage spinel-structured cladding layer was designed by wet chemistry and coated on the surface of LiNi 0.83 Co 0.11 Mn 0.06 O 2 material. LiNi 0.5 Mn 1.5 O 4 with spinel structure possesses good structural compatibility with layered cathode materials and has efficient three-dimensional Li-ion diffusion paths, which can meet the needs of Li-ion diffusion kinetics. Meanwhile, LiNi 0.5 Mn 1.5 O 4 has a high operating voltage and a very stable thermodynamic structure in the charging state which can inhibit the corrosion and interfacial side reactions of the cathode material, thus stabilizing the crystal structure. The results show that 1 wt% LiNi 0.5 Mn 1.5 O 4 -coated sample displayed the best electrochemical performance, with a discharge capacity of 203.7 mAh g −1 at 1 C, the capacity retention of 77.71% after 200 cycles, and even after 300 cycles, the capacity retention still reached 64.36%.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 10
·4567-4576
·
IF 2.289
Xu Chun-Sheng,Yu Hai-Tao,Guo Chen-Feng,Xie Ying,Ren Ning,Yi Ting-Feng,Zhang Guo-Xu
To improve the stability and performance of the cathode materials, an ionic conductor layer was coated successfully on the surface of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMNC) microspheres. The structural analysis confirmed that LiV 3 O 8 coating did not change the basic structure of LMNC, and all obtained materials are solid solutions with a good-layered structure and a good crystallinity. The microscopy measurement showed that the thickness of the coating layer for the LV-3 sample is about 2.5 nm. This appropriate layer is helpful for improving the surface stability of LMNC and the diffusion of lithium, leading to an obvious enhancement of the electrochemical performance. Our result confirmed that the average discharge specific capacities for LV-3 sample at 0.1 C, 0.2 C, 0.5 C, 1 C, and 3 C are respectively 265.9, 219.1, 188.0, 156.3, and 121.5 mAh g −1 , which are much larger than the values of other samples. After 50 cycles at a 1 C rate, the capacity retentions for different samples are 60.7%, 74.0%, 87.6%, and 70.4%, indicating that LV-3 sample exhibits the best performance. Furthermore, EIS measurements showed that the diffusion coefficient for LV-3 sample is calculated to be 1.26 × 10 −15 cm 2 s −1 , which is also the largest value among all considered samples. Our experiments identified that coating an ionic conductive layer on the cathode material surface will significantly improve their rate capacity and cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态离子学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Jijiang Huang,Duolun Wang,Yang Jiang,Wen Liu,Jing Li,Hongyan Xie
The spinel-structured LiNi 0·5 Mn 1·5 O 4 (LNMO) has attracted considerable attention in cathode material research due to its elevated energy density and high voltage. However, the practical application of LNMO is limited by issues such as surface structural instability and side reactions caused by electrolyte breakdown. To address these issues, this study constructed a CaF 2 coating layer on the surface of LNMO cathode material through wet chemical methods , investigated the protective mechanism and electrochemical performance of the CaF 2 coating layer on the cycling process of LNMO cathode material. Experimental findings indicate that an appropriate amount of CaF 2 coating does not modify the intrinsic structure of the material, effectively decreases side reactions with the electrolyte during the LNMO cycling process under high-voltage conditions, and significantly stabilizes the material structure and enhances capacity retention during high-rate cycling. Consequently, the material coated with 5 % CaF 2 demonstrates the best electrochemical performance, achieving a capacity retention of 92.7 % after 200 cycles at a 3C rate, compared to only 76.8 % for the bare material. This study provides some ideas for building stable high-voltage LNMO cathode material.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2016
·Vol. 26
·期 3
·481-487
·
IF 2.322
Zhen Zhang,Pengfei Zhou,Huanju Meng,Chengcheng Chen,Fangyi Cheng,Zhanliang Tao,Jun Chen
LiNi 0.915 Co 0.075 Al 0.01 O 2 (NCA) with Zr(OH) 4 coating is demonstrated as high performance cathode material for lithium ion batteries (LIBs). The coated materials are synthesized via a simple dry coating method of NCA with Zr(OH) 4 powders, and then characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Experimental results show that amorphous Zr(OH) 4 powders have been successfully coated on the surface of spherical NCA particles, exhibiting improved electrochemical performance . 0.50 wt% Zr(OH) 4 coated NCA delivers a capacity of 197.6 mAh/g at the first cycle and 154.3 mAh/g after 100 cycles with a capacity retention of 78.1% at 1 C rate. In comparison, the pure NCA shows a capacity of 194.6 mAh/g at the first cycle and 142.5 mAh/g after 100 cycles with a capacity retention of 73.2% at 1 C rate. Electrochemical impedance spectroscopy (EIS) results show that the coated material exhibits a lower resistance, indicating that the coating layer can efficiently suppress transition metals dissolution and decrease the side reactions at the surface between the electrode and electrolyte. Therefore, surface coating with amorphous Zr(OH) 4 is a simple and useful method to enhance the electrochemical performance of NCA-based materials for the cathode of LIBs.
研究领域:
电化学
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材料科学
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能源存储
·
电池技术
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无机非金属材料
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Lingjun Li,Lingfeng Xia,Huiping Yang,Xuehui Zhan,Jie Chen,Zhaoyong Chen,Junfei Duan
The high voltage application of the LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode is still hindered by its unstable surficial structure and poor capacity retention. Surface coating has been proved to be an effective strategy to deal with these problems. However, previous multistep surface coating approaches greatly complicate the synthesis procedure. In this work, a simple and large-scale solid-state approach is developed to prepare lanthanum-based oxides co-coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode materials . Electrochemical tests indicate that the co-coated samples exhibit superior cycle life and higher rate performance than those of the pristine sample. Further studies reveal that the enhanced interface stability and facilitated electron transportation can be attributed to the synergetic contribution provided by the lanthanum-based oxides co-coating layer. The present work demonstrates that our approach can achieve cathode synthesis and surface coating synchronously, and shows great potential to apply on a large scale and extent to all Ni-rich cathodes.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）