Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 39
·22463-22474
·
IF 10.733
Qian Lu,Xiaohong Zou,Ran Ran,Wei Zhou,Kaiming Liao,Zongping Shao
Lithium–sulfur (Li–S) batteries are of great interest due to their high theoretical energy density and potentially low cost. However, two of the key issues hindering their commercialization are the polysulfide shuttling and Li-dendrite growth, which result in severe capacity decay and serious safety hazards. Herein, liquid-phase delaminated birnessite (HxMnO2+x) nanosheets along with graphene and carbon nanotubes are utilized for the first time to create an “electronegative” coating layer for Li–S batteries to suppress the polysulfide shuttling and Li-dendrite growth. The as-prepared coating layer enables stable cycling of the Li–S battery with a low capacity decay rate of 0.04% per cycle over 1000 cycles at 1C. In addition, a Li-symmetrical cell with the coating layer shows suppressed dendrite growth even after being cycled over 1000 hours at 1 mA cm−2. This excellent performance is ascribed, in part, to the synergistic effect of the chemical and electrostatic interactions among polysulfides, Li ions, and [MnO2+x]x− ions, resulting in a homogeneous Li-ion flux distribution and a mitigated polysulfide shuttling. The proposed concept of an “electronegative” bifunctional coating layer illustrates a simple and effective way to develop highly stable and safe Li–S batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Jin Zhu,Mingyu Zhang,Yunyan Gai,Ronghua Zeng,Yuepeng Cai,Dongsheng Lu
Tosylmethyl isocyanide (TosMIC) is used as electrolyte additive to study the effect on the cycling performance of LiNi 0.5 Mn 1.5 O 4 (LNMO)/graphite 5V lithium-ion cell. The constant current charge and discharge measurement results shows that the capacity retention rate of the cell containing 0.3 wt% TosMIC increases by 18% after 200 cycles, while 1.0 wt% TosMIC worsens the cycling performance of the cell. The decomposition product PF 5 of electrolyte salt LiPF 6 may interact with TosMIC to form TosMIC-PF 5 complex. The results of surface and electrochemical analysis indicate that the complex can be oxidized at the cathode and reduced at the anode simultaneously prior to the solvent molecules of the electrolyte. Theoretical calculation further shows that TosMIC-PF 5 can be oxidized to form a dimer (TosMIC-PF 5 ) 2 at 4.46V ( vs . Li/Li + ), which may be deposited on the LNMO cathode to help form a coating layer . This coating layer can be rapidly formed in the first cycle and can significantly alleviate the oxidation of the electrolyte, but it cannot inhibit the decomposition of excessive additive. Two proposed reduction reactions of TosMIC-PF 5 occur at 1.66 V and 2.00 V ( vs . Li/Li + ). Unfortunately, the reduction of this additive has a negative impact on the cycling performance of the cell.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wanjiao Li,Jing Li,Xiaoling Peng,Jiaxin Xu,Yanting Yang,Dingfeng Jin,Hongxiao Jin,Xinqing Wang,Hongliang Ge
In this study, single-phase yttrium iron garnet (YIG) ferrite was synthesized by sol-gel method, which was firstly used as the insulating layer to prepare Fe/YIG soft magnetic composites (SMCs). It was demonstrated that the Fe powders were uniformly coated with the YIG ferrite for the Fe/YIG SMCs. The influence of the YIG content on the soft magnetic properties of the Fe/YIG SMCs were investigated in detail, the results showed that the total core loss ( P cv ) of all Fe/YIG SMCs were smaller than pure Fe. The P cv firstly decreased with increase of the YIG content up to 1.0 wt% ( P cv = 2460 mW/cm 3 , 4 mT/590 kHz), then increased with the increase of YIG from 1.0 wt% to 5.0 wt%. What’s more, the effective permeability ( μ e ) of the Fe/YIG SMCs with YIG from 1.0 wt% to 3.0 wt% were higher than that of Fe, confirming both decreased core loss and improved permeability were accomplished in the Fe/YIG SMCs, which demonstrated that the YIG ferrite has good application prospects as new coating layer for SMCs used in medium to high frequency environments.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Bin Wang,Yu Dong,Zihao Zeng,Hai Lei,Yue Yang,Peng Ge
Attracted by the potential value of spent lithium-ion batteries, their high effective-recycling has been devoted to numerous attentions. Unfortunately, spent graphite is always used as fossil fuel, accompanying with the serious resources wasting and carbon emission. Owing to low-cost and energy-consumption, their direct regeneration has been regarded as the next-generation key technology. Although high-temperature sintering can induce the recovering of internal structure, they still suffer from strong surface anisotropy. Herein, through the introduction of coating-layer, their infiltration abilities and isotropy are effectively improved. And, their physical-chemical properties can be recovered to that of commercial materials, containing compact-density, impurities-content and conductivities. The as-regenerated sample delivers a Li-storage capacity of 324 mA h g −1 at 1.0 C after 250 cycles. Even at high rates, their specific capacity can be still kept at about 286 mA h g −1 after 300 loops. Assisted by detailed electrochemical analysis, the pre-storage role of surface/near-surface layer is successfully confirmed, accompanied by stable charge balance. Moreover, its diffusion energy barrier of layers is further decreasing, accompanying with the considerable ion-diffusion behaviors. Therefore, the work is anticipated to provide significant surface-tailoring strategy for spent graphite, meanwhile illustrating the in-depth understanding of carbon-layers effect.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 16
·14869-14877
·
IF 2.195
Zhang Yiqun,Dong Yaqiang,Liu Lei,Chang Liang,Zhou Bang,Chi Qiang,Wang Xinmin
A high-filling alumina/epoxy nanocomposite with improved thermal stability and insulation performance has been successfully designed as an organic–inorganic coating layer for the toroid-shaped FeSiBPNbCr amorphous magnetic powder cores (AMPCs). Unlike the organic coating, the organic–inorganic hybrid coating cores exhibited superior magnetic properties without compromising on saturation magnetization and permeability. The core loss declined by 40%, and the quality factor was 13% higher as half alumina was introduced into the epoxy resin matrix. A thin and uniform-coating layer of alumina/epoxy nanocomposite led to better high-frequency characteristics than those obtained with direct coating of the cores with alumina. Besides the outstanding magnetic properties, the Fe-based AMPCs with a convenient insulation-coating process cost lesser than Fe–Ni magnetic powder cores, thereby rendering the Fe-based AMPCs a potential candidate for a variety of industrial applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Shao-Lun Cui,Dan Feng,Zhen-Xue Xiao,Sheng Liu,Xue-Ping Gao,Guo-Ran Li
Ni-rich layered cathode materials are being paid much attention to because their high capacity can handily improve energy density of lithium-ion batteries. However, Ni-rich cathode materials still suffer from the deficiencies such as poor cycle stability, weak structural and thermal stability. In this work, Eu 2 O 3 -doped Li 4 SiO 4 with an enhanced ionic conductivity is proposed as surface coating layer for LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM) cathode material to improve the capacity retention and structural stability during cycling. The doping of Eu 2 O 3 in Li 4 SiO 4 makes the coating layer have higher ion conductivity and better stability than pure Li 4 SiO 4 layer. When the doping amount is 10 mol% of Li 4 SiO 4 , the corresponding cathode material NCM-LS3-0.10Eu 2 O 3 exhibits the optimal cycle and rate performance. The discharge specific capacity and capacity retention after 400 cycles at 1 C rate are 150.1 mAh g −1 and 80.48%, respectively. In particular, the NCM-LS3-0.10Eu 2 O 3 secondary particles avoid the appearance of serious cracks and maintain excellent structural stability even after long cycling. It is proved finally that the Eu 2 O 3 -doped Li 4 SiO 4 coating layer can not only inhibit the side reactions caused by the contact between electrode surface and electrolyte, but also reduce the resistance of lithium ion migration and suppress the microstructure changes caused by local stress.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 47
·2206970
·
IF 32.086
Zhijia Zhang,Xu Yang,Peng Li,Yao Wang,Xin Zhao,Javad Safaei,Hao Tian,Dong Zhou,Baohua Li,Feiyu Kang,Guoxiu Wang
Rechargeable multivalent metal (e.g., zinc (Zn) and aluminum (Al)) batteries are ideal choices for large-scale energy storage owing to their intrinsic low cost and safety. However, the poor compatibility between metallic anodes and electrolytes strongly hampers their practical applications. Herein, it is demonstrated that confining multivalent metals in a biomimetic scaffold (Bio-scaffold) can achieve highly efficient multivalent metal plating/stripping. This Bio-scaffold is well-tailored through the synergy of a parallel-aligned array of fractal copper branches and a CaTiO 3 (CTO)-based coating layer. By virtue of this design strategy, the as-developed Bio-scaffold-based Zn- and Al-metal anodes exhibited dendrite-free morphologies with high reversibility and long lifespan, as well as excellent performance for Zn and Al full batteries. Theoretical modeling and experimental investigations reveal that the fractal copper array not only facilitates multivalent ion diffusion and electrolyte wetting but also effectively reduces the local current densities during cycling; Meanwhile, the CTO-based coating layer effectively blocks interfacial side reactions and enables a homogeneous ionic flux. This work opens a new avenue for developing multivalent metal batteries.
研究领域:
材料科学
·
电化学
·
储能系统
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2018
·
IF 5.08
Linawati Sutrisno,Yan Hu,Xinkun Shen,Menghuan Li,Zhong Luo,Liangliang Dai,Sixiang Wang,Julia Li Zhong,Kaiyong Cai
Infection associated with orthopedic implants is the chief cause of implant failure. An important consideration to prevent the infection at implants is to inhibit the biofilm formation for the initial 6 h. Therefore, we fabricated hyaluronidase-sensitive multilayers of chitosan (Chi)/sodium hyaluronate-lauric acid (SL) onto the surface of bone morphogenetic protein 2 (BMP2) loaded titanium nanotube (TNT) via spin-assisted layer-by-layer technique. The results of both Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance ( 1 H NMR) confirmed the successful synthesis of SL. The multilayer structure on BMP2 loaded TNT was characterized by field-emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM) and water contact angle, respectively. The release profiles confirmed that hyaluronidase could trigger the release of lauric acid (LA) from the SL multilayer and accelerate the release of BMP2 in the system. The hyaluronidase-sensitive-multilayer-coated BMP2-loaded TNT (TNT/BMP2/(Chi/SL/Chi/Gel) 4 ) not only demonstrated good antibacterial capability, but also showed good biocompatibility in in vitro usage, which was supported by the efficient growth inhibition of both Staphylococcus aureus and Escherichia coli , as well as higher cell viability, alkaline phosphatase activity, mineralization capability, and higher gene expression of osteoblasts on TNT/BMP2/(Chi/SL/Chi/Gel) 4 . This study developed an alternative approach to fabricate effective antibacterial implants for orthopedic implantation.
研究领域:
材料科学
·
生物材料
·
骨科
·
生物医学工程
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）