JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yunyi Lu,Chenqi Kang,Zhenxiang Ye,Lehui Liu,Feifei Yuan,Yisheng Huang,Lizhen Zhang,Zhoubin Lin
This paper presents a method that employs charge compensation to effectively enhance the spectral, mechanical, and thermal properties of Cr 3+ : Ca 3 (VO 4 ) 2 (Cr:CVO) crystals. Due to doping with heterovalent ions, a significant number of oxygen vacancies are present in the Cr:CVO crystals, resulting in strong self-absorption and suppression of emission at 842 nm. To address this issue, Li + ions were introduced as charge compensators. When the concentration of Li + ions reached 5 at%, self-absorption was most effectively suppressed, and the emission at 842 nm was significantly enhanced. Additionally, the mechanical and thermal properties of the crystal are significantly improved. The XPS research results indicate that changes in the color, spectra, and physical properties of Cr:CVO crystals primarily depend on the relative concentration of oxygen vacancies within them. Both annealing and the introduction of Li + ions effectively reduce the high concentration of oxygen vacancies in Cr:CVO crystals. However, the strategy of Li + ion charge compensation is more effective than annealing in comprehensively enhancing the overall performance of Cr:CVO crystals. This study presents an effective strategy for defect regulation and performance optimization in Cr 3+ -doped oxide laser crystals.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Long Chen,Gen Chen,Zuxin Wen,Dan Wu,Zuoyu Qin,Ning Zhang,Xiaohe Liu,Renzhi Ma
Undesirable dendrite growth and infinite volume expansion are the major barriers to the potential application for next-generation safe Li metal batteries. To solve these problems, we herein report electroplating CuO nanoneedle arrays on Ni foam (NCNF) as 3D porous framework for Li metal batteries. The influence of different morphologies of CuO on guiding Li plating/stripping behavior has been investigated. The homogenous deposition of Li can be attributed to the interspace between the CuO nanoneedles, which is remarkably superior over granular CuO on Ni foam (GCNF) at high areal capacity. The hierarchical skeleton can not only decrease local current inhomogeneity but also alleviate the volume change of Li. The NCNF electrode delivers a higher Coulombic efficiency of Li deposition comparing with the bare Ni foam and GCNF. Furthermore, enhanced cycling stability with small overpotential can be achieved in symmetric cells. In a Li/LiFePO 4 full cell, the excellent cycling performance also proves the superiority of NCNF@Li composite electrode.
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DOI
高影响因子
Small
·
2017
·Vol. 13
·期 34
·1701260
·
IF 8.643
Chao Zhu,Ziqiang Liu,Jian Wang,Jun Pu,Wenlu Wu,Qingwen Zhou,Huigang Zhang
A novel spinel Co 2 VO 4 is studied as the Li-ion battery anode material and it is sandwiched with a 3D ultralight porous current collector (PCC) and amorphous carbon. Co 2 VO 4 demonstrates the high capacity and excellent cyclability because of the mixed lithium storage mechanisms. The 3D composite structure requires no binders and replaces the conventional current collector (Cu foil) with a 3D ultralight porous metal scaffold, yielding the high electrode-based capacity. Such a novel composite anode also enables the close adhesion of Co 2 VO 4 to the PCC scaffold. The resulting monolithic electrode has the rapid electron pathway and stable mechanical properties, which lead to the excellent rate capabilities and cycling properties. At a current density of 1 A g −1 , the PCC and carbon sandwiched Co 2 VO 4 anode is able to deliver a stable reversible capacity of about 706.8 mAh g −1 after 1000 cycles. Generally, this study not only develops a new Co 2 VO 4 anode with high capacity and good cyclability, but also demonstrates an alternative approach to improve the electrochemical properties of high capacity anode materials by using ultralight porous metallic current collector instead of heavy copper foil.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Peng-Yuan Zhai,Shi-Xi Zhao,Hong-Mei Cheng,Jian-Wei Zhao,Ce-Wen Nan
Li 2 MnSiO 4 /C nanocomposites have been successfully prepared by a two-step method to accurately control the formation of the orthorhombic Pmnb phase, and phosphate substitution is used to improve the electrochemical performance of this cathode material . The structure and electrochemical properties are investigated using X-ray diffraction, scanning electron microscope and electrochemical tests. The crystal structure of this material is confirmed to be Pmnb polymorph and the average grain size is about 80–100 nm. The electrochemical tests indicate that Li 2.1 Mn 0.9 [PO 4 ] 0.1 [SiO 4 ] 0.9 /C nanocomposites deliver a discharge specific capacity of 216.9 mAh·g −1 after initial activation and it shows much enhanced electrochemical performance compared with Li 2 MnSiO 4 /C nanocomposites. Furthermore, the XRD patterns , HRTEM images and Raman analysis reveal the crystal structural changes of the two samples during cycling. Thus, this material has shown potential for high power applications in Li-ion batteries.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Bin Li,Mengqing Xu,Benzhen Li,Yanlin Liu,Liang Yang,Weishan Li,Shejun Hu
The physical and chemical properties of the solid electrolyte interphase (SEI) formed by prop-1-ene-1,3-sultone (PES) on graphite anode in propylene carbonate (PC) based electrolyte for lithium ion battery were investigated by charge–discharge test, scanning electron spectroscopy with energy dispersive X-ray spectroscopy (SEM–EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). It is found that the charge–discharge performance of the cell LiCoO 2 /natural graphite (NG) using PC-based electrolyte containing 3 wt% PES is superior to that containing 6 wt% propane sultone (PS), an SEI formation additive that has the similar molecular structure to PES but is reduced not as easily as PES. The results from SEM–EDS, FTIR and XPS show that the structure of graphite has been protected and some S-containing species are proven to be components of the SEI, suggesting that the preferable reduction of PES plays an important role in the formation of a protective SEI on NG.
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Wenfeng Cui,Chao Ma,Xiaofeng Lei,Yang Lv,Qingxu Zhang,Weiye Guan,Xizheng Liu
The instability of the electrolyte and insufficient ionic conductivity are considered the main problems that adversely affect applications of Li-air batteries (LABs) at sub-zero temperatures. In this study, a polymer-confined gel (PCG) electrolyte suitable for low-temperature LABs is developed by confining high donor number dimethyl sulfoxide (DMSO) within an in situ polymerized 4,4′-bis(stearoylamino)diphenyl ether (BSDE) matrix. The strong hydrogen bonds between the BSDE framework and DMSO molecules has destroyed the frozen structure of DMSO, thus the ionic conductivity at lower temperature has thus been improved. Furthermore, a local high-concentration electrolyte is constructed using DMSO as a solvent to dissolve the Li salt. The ionic conductivity of PCG in the fabricated electrolyte at −20 °C is maintained at 0.15 mS cm −1 , which is 5.5 times higher than the corresponding liquid DMSO electrolyte. As a result, the LABs equipped with PCG display a long cycle life of 450 h (−20 °C) and 760 h (25 °C), whereas the LABs with a liquid DMSO electrolyte fail at −20 °C and can only operate for 40 h at 25 °C. This study provides a feasible but facile strategy for the design of gel electrolytes suitable for low-temperature LABs, and this strategy can be extended to other energy-storage systems.
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DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Long Li,Chun Fang,Wenfei Wei,Lei Zhang,Zhao Ye,Gang He,Yunhui Huang
The huge volume change of silicon anode during cycling results in unstable solid electrolyte interface (SEI), causing rapid performance degradation . Natural SEI layer has a heterogeneous structure, results in the inhomogeneous Li + diffusion. The repeated destruction and regeneration of SEI aggravate the inhomogeneity of Li + diffusion at the interface, leading to non-uniform alloy reaction in the Si bulk. In this work, the silicon surface is passivated by an ultrathin uniform chitosan layer with abundant lithiophilic groups. The capacity of chitosan-coated Si (Si@CS) could reach 1500 mAh g −1 at a current density of 1 A g −1 , and the capacity retention remains 91% after 400 cycles. It is demonstrated that the oxygen and nitrogen atoms in chitosan are coordinated with Li + , providing uniformly distributed Li + transfer sites, results in a homogeneous Li + flux in the surface layer. Interestingly, a nano-scale ordered atomic arrangement is observed in the delithiated Si@CS, which contributes to more stable and reversible lithiation/delithiation reaction of the Si@CS electrode. It is proposed that optimizing the reaction interface on the Si surface is able to alter the Li-ion diffusion kinetics and structure transition behavior of silicon, which can improve the structure reversibility and stability during cycling.
研究领域:
材料科学
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电化学
·
纳米科技
·
能源存储
·
表面工程
·
锂离子电池
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DOI
高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Shuzhen Yang,Yanfang Huang,Shengpeng Su,Guihong Han,Jiongtian Liu
A hybrid water-soluble humics-based binder (humics/sodium carboxymethyl cellulose (CMC)) was studied to enhance the electrochemical performance of a Li-ion battery cathode (LiFePO 4 ) in this work. Molecular dynamics simulations of binder active fractions with related materials (LiFePO 4 and Al) were performed to explore the binding mechanisms. Humics serve to connect the active material and provide a conducting bridge in the cathode. To improve the adhesion between the particles and current collector, CMC is added as an auxiliary fraction with a mass ratio of humics to CMC of 3:1. The scanning electron microscope results indicate that the morphology of the electrode with the hybrid humics/CMC binder is more uniform than that of electrodes with conventional polyvinylidene fluoride and CMC binders. The electrochemical performance and cycling stability of the cathode materials are obviously enhanced. The reversible specific capacity can reach 152.3 mAh g −1 at 0.5 °C after 100 cycles. The rate capability is greatly improved, with a specific capacity as high as 105 mAh g −1 at 8 °C. The humics/CMC composite can be regarded as a novel, environmentally friendly and high-efficiency binder for application in Li-ion batteries.
研究领域:
电化学
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材料科学
·
能源存储
·
纳米材料
·
可持续能源技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yihui Li,Kun Chang,Hongwei Tang,Bao Li,Yalei Qin,Yan Hou,Zhaorong Chang
To address the large structural and volume changes of commercial WO 3 during charge/discharge, which make this material unsuitable for use in Li-ion batteries (LIBs), we herein prepared oxygen deficient WO 3- x nanosheets on a large scale by thermal treatment of ammonium paratungstate in a reducing atmosphere followed by sonication and freeze-drying. The above nanosheets were employed as LIB anode materials and exhibited a specific capacity and cycling stability significantly exceeding those of oxygen-deficient WO 3- x nanoparticles and commercial WO 3 . In addition, we investigated the effect of nanosheet loading on electrode performance, demonstrating that the best results (Li storage capacity of ∼628 mAh g −1 after 100 cycles at 100 mA g −1 ) were obtained at a nanosheet content of 20 wt%. This excellent performance was ascribe to the good exposure of defects caused by the comparatively small size of WO 3- x nanosheets , which resulted in an increased number of sites and diffusion paths available for Li-ion storage and transfer. The novel electrode-optimized strategy may be extended to the fabrication of other electrodes that use nanomaterials as active substances due to its superior comprehensive performance and low cost.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
电池技术
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DOI
高影响因子
Energy Technology
·
2022
·Vol. 11
·期 11
·2200376
·
IF 4.149
Peng Xu,Decheng Zhao,Shupei Liu,Jinghui Ren,Jian Zhou,Ning Wang,Zhoulu Wang,Xiang Liu,Yutong Wu,Yi Zhang
Selenium cathodes are expected to become next-generation energy storage materials due to their high electronic conductivity and volumetric capacity. However, their commercial applications are hindered by polyselenides dissolution and low Se utilization. Herein, a biomass compound, namely lychee seed, is used as a sustainable precursor to design hierarchically porous carbon by a single-step carbonization activation method. With a unique hierarchical porous structure, the lychee seed–derived activated carbon (LSDAC) used to encapsulate selenium delivers a reversible capacity of 446 mA h g −1 at 2 C and 291 mA h g −1 at 5 C after 1000 cycles. The Se/LSDAC electrodes show the most favorable fast-charging and good cycling behavior compared to the previously reported biomass-based carbon materials. By increasing the Se area loading to 9.5 mg cm −2 , the Se/LSDAC cathode maintains an areal capacity of 3.7 mA h cm −2 (3.2 mA cm −2 areal current density) after 80 cycles. High Se loading and economical and fast-charging cathode designs in Li–Se batteries are inspired.
研究领域:
电化学储能
·
材料科学
·
纳米能源材料
·
可持续能源技术
·
先进电池技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Zhao Jiang,Taibo Liang,Yu Liu,Shengzhao Zhang,Zhongxu Li,Donghuang Wang,Xiuli Wang,Xinhui Xia,Changdong Gu,Jiangping Tu
It is still a big challenge to simultaneously enhance the ionic conductivity, dendrite suppression capability, and interfacial compatibility of sulfide solid electrolytes. In this work, a novel Li7P2.88Nb0.12S10.7O0.3 solid electrolyte is prepared via Nb and O cosubstitution of glass-ceramic Li7P3S11. This sulfide-based electrolyte possesses a high ionic conductivity (3.59 mS cm–1) at 298 K, improved critical current density (1.16 mA cm–2), and excellent interfacial compatibility between the sulfide electrolyte and Li2S active material. The improved electrochemical stability of the sulfide solid electrolyte against metallic lithium is attributed to the formation of Nb and Li2O at the interface, which can induce uniform Li deposition and prevent further side reaction. The all-solid-state Li/Li2S batteries based on this electrolyte exhibit remarkably enhanced cycling stability and rate performance.
研究领域:
材料科学
·
电化学
·
储能技术
·
固体离子学
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DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Tao Jiang,Bowen Zhu,Haiyun Shen,Ying Liu,Hao Liu,Wei Zheng,Mengtao Wu,Ning Xu,Li Chen
The Ni-rich LiNixCoyMn1–x–yO2 with high specific capacity and superior thermal stability under a high cutoff voltage (>4.3 V) will play a critical role in high-power lithium-ion batteries (LIBs). In this paper, LiNi0.8Co0.1Mn0.1O2 (NCM811) equipped with a stable garnet ceramic Li6.5La3Zr1.5Ta0.5O12 (LLZTO) nanoshell is successfully synthesized via a simple wet chemical approach. X-ray diffraction, scanning electron microscope (SEM), energy-dispersive spectrometer (EDS) element mapping, and transmission electron microscopy (TEM) confirm the presence of LLZTO on the NCM811 surface. The NCM811 with 2 wt % LLZTO (2-NCM811) can deliver a superior specific capacity of 144.4 mAh·g–1 at 1C (2.8–4.3 V) after 100 cycles, accompanied by a capacity retention rate as high as 81.1%. But pristine NCM811 has a discharge capacity of only 119.6 mAh·g–1 and a capacity retention rate as low as 69.5% under the same condition. What is more, 2-NCM811 exhibits an enhanced discharge capacity of 129.6 mAh·g–1 at 1C (2.8–4.5 V) after 100 cycles and a high capacity retention rate of 62.9%, which are superior to those of pristine NCM811 (110.0 mAh·g–1, 57.6%). The improved high-potential performance of 2-NCM811 can be attributed to the positive role of the LLZTO shell, which enhances the structural stability and simultaneously inhibits adverse side reactions at the surface of 2-NCM811 during cycling. Based on the above advantages, LLZTO with three-dimensional (3D) diffusion pathways and high ion conductivity is expected to be the most prospective material for the surface modification engineering of nickel-rich cathode materials in lithium-ion batteries (LIBs).
研究领域:
材料科学
·
电化学
·
储能技术
·
锂离子电池
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DOI
高影响因子
危险品化学品经营许可证（带存储）