CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guotai Zhang,Chunxi Hai,Yuan Zhou,Weiping Tang,Jingze Zhang,Jinbo Zeng,Yanhua Liu,Shengde Dong,Guiping Peng
A surge of interest has been attracted by Li 1.6 Mn 1.6 O 4 -type adsorbent for collecting lithium resources from salt-lake brines due to its excellent selectivity, high theorical adsorption capacity up to 72. 3 mg g −1 and low cost. However, its large-scale practical application is limited because of its bone element Mn dissolution during the cycled desorption process. Herein, F and Al co-modifying technique, an efficient method for stabilizing its spinel structure or forming protective coating, was employed to improve the application performances of Li 1.6 Mn 1.6 O 4 -type adsorbent prepared by sol–gel method. Based on the various characterization results, the co-modification not only leads to the formation of fluoride-rich coating and the substitution of Mn 3+ by Al 3+ , but also generates the active adsorbents with abundant nano-islands. DFT calculations revealed that the coating layer is indeed AlF 3 rather than LiF. In addition, in-situ high-temperature XRD tests demonstrates that the co-modification can significantly enhance the heat resistance and structural stability of the material. As-prepared adsorbent exhibits greatly improved Li adsorption capacity (increased from 28.5 to 33.7 mg g −1 ), lower Mn loss rate (decreased from 2.1 to 1.8%), enhanced cycling stability and good adsorption selectivity in the Qarhan brine containing Na + , K + , Ca 2+ , Mg 2+ , which is very significant and important for effectively removing lithium from low-grade brines.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Yang,Yawen Deng,Li Zhang,Yaru He,Shuai Zhao,Ting Xiao,Suihu Dang,Yunfeng Bai
Er 3+ /Li + co-doped Y 2 O 3 nanocrystals were synthesized by the sol-gel method. Fluorescence intensity has been enhanced about 270 times under 980 nm laser excitation by combined laser annealing (90 times) and co-doped with Li + ions (3 times). The doping of Li + ions increased the asymmetry around Er 3+ , while laser annealing reduced surface defects . Fluorescence characteristics with the temperature of laser annealed Er 3+ /Li + co-doped Y 2 O 3 nanocrystals were studied. An interesting phenomenon that the non-thermal coupling of I 563 /I 799 transformed into the thermal coupling as the temperature rises is found. The possible mechanisms were discussed, and fluorescence thermometry based on I 563 /I 799 showed higher temperature sensitivity than other reports. The effective fluorescence enhancement method and the new fluorescence thermometry energy levels can promote the application of rare earth fluorescent materials.
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高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Qiuyan Liu,Gaojing Yang,Xiaoyun Li,Simeng Zhang,Renjie Chen,Xuefeng Wang,Yurui Gao,Zhaoxiang Wang,Liquan Chen
Poly(vinylidene fluoride) (PVDF) is the most popular electrode binder in the current lithium ion batteries (LIBs). Depending on solvent content, polymer electrolytes are classified into solid polymer electrolyte (SPE; solvent-free) and gel polymer electrolytes (GPE; solvent-rich). PVDF-based electrolytes with high contents of solvent undisputedly belong to GPE. However, the affiliation (SPE or GPE) of the PVDF-based electrolyte with low content of “solvent” is in argument as its “solvent” cannot be eliminated till 80 °C in vacuum and its structure and ion transport mechanism remain unclear. By a series of studies, we demonstrate that this is actually a polymer electrolyte based on the interactions between the [solvent-Li + ] complex and the polymer in structure and in Li-ion transport mechanism. The “residual solvent” (N,N-dimethylformamide, DMF, for example) plays critical roles in constructing the polymer electrolyte and in determining its ion transport and therefore such electrolyte cannot be assigned to any of the known polymer electrolytes. The Li + -associated DMF becomes difficult to be eliminated while the DMF-dehydrofluorinated PVDF has a larger dielectric constant, enhances the dissociation of the lithium salt and interacts with the [DMF-Li + ] complex, the charge carrier of the electrolyte. These [solvent-Li + ] complex-based polymer electrolytes have high ionic conductivity (10 −4 S cm −1 at room temperature), Li-ion transference number (0.44) and Young's modulus (45.87 MPa) and will find important applications in the solid lithium batteries and as an ion-conducting binder for the electrodes. These findings will enrich the gallery and deepen the fundamental understandings of the polymer electrolytes, spurring designing of novel electrolytes.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Hanwu Luo,Haipeng Shi,Yang Cao,Yuting Yin,Yi-Hu Feng,Xin-Yu Fan,Peng-Fei Wang,Xiaogang Han
Delivery of a high operating voltage with stable cycling behavior is a challenge in developing cathodes for high-energy Li-ion batteries (LIBs). The representative spinel LiNi0.5Mn1.5O4 materials own a high discharge voltage of 4.7 V (versus Li+/Li) and a large theoretical specific capacity of 147 mA h g–1. However, they usually suffer from undesired transition metal dissolution and intensive cathode–electrolyte interfacial side reactions during high-voltage cycling, incurring unacceptable capacity decay and short cycle life. To solve these problems, we present a radially aligned hierarchical structure with different chemical compositions from the bulk (LiNi0.4Cr0.1Mn1.5O4) to the surface (LiNi0.5Mn1.5O4) of the structure. The introduction of Cr3+ to the inner end suppresses the Jahn–Teller active Mn3+ and partial Mn2+ dissolution, thus improving the bulk stability. The construction of the undoped shell avoids and eliminates the catalytic effect of the dopant on interfacial side reactions, thus enhancing the interfacial stability. As a consequence, the designed LNMO@iCr–LNMO (6 wt % coating) compound achieves capacity retentions of 95.2% at 1C after 500 cycles and 93.6% at 2C after 1000 cycles. This work highlights the significance of bulk and interface chemistry in high-energy cathode materials for LIBs.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Dan Zhang,Yixin Luo,Jiaxiang Liu,Yu Dong,Cong Xiang,Chenke Zhao,Hongbo Shu,Jianhua Hou,Xianyou Wang,Manfang Chen
The practical progress of lithium–sulfur batteries is hindered by the serious shuttle effect and the slow oxidation–reduction kinetics of polysulfides. Herein, the ZnFe2O4–Ni5P4 Mott–Schottky heterojunction material is prepared to address these issues. Benefitting from a self-generated built-in electric field, ZnFe2O4–Ni5P4 as an efficient bidirectional catalysis regulates the charge distribution at the interface and accelerates electron transfer. Meanwhile, the synergy of the strong adsorption capacity derived from metal oxides and the outstanding catalytic performance that comes from metal phosphides strengthens the adsorption of polysulfides, reduces the energy barrier during the reaction, accelerates the conversion between sulfur species, and further accelerates the reaction kinetics. Hence, the cell with ZnFe2O4–Ni5P4/S harvests a high discharge capacity of 1132.4 mAh g–1 at 0.5C and displays a high Coulombic efficiency of 99.3% after 700 cycles. The ZnFe2O4–Ni5P4/S battery still maintains a capacity of 610.1 mAh g–1 with 84.4% capacity retention after 150 cycles at 0.1C under a high sulfur loading of 3.2 mg cm–2. This work provides a favorable reference and advanced guidance for developing Mott–Schottky heterojunctions in lithium–sulfur batteries.
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PubMed
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Tao Liang,Gang Peng,Xiangzhe Zhang,Yuehua Wei,Xiaoming Zheng,Wei Luo,Mengyan Dai,Chuyun Deng,Xueao Zhang
Two-dimensional materials with optical turnability have wide prospect in related applications such as electrochromic coating and thermal camouflage. Here we report a Li-intercalated ultrathin graphite device with tunable visible-near-infrared reflectivity . After Li-ion intercalation, the Fermi surface of ultrathin graphite will move to a higher level, which prevents the interband optical transitions below it. Therefore, it is possible to change the absorptivity or emissivity of ultrathin graphite through reversible Li-ion intercalation, which accomplishes the modification to reflectivity indirectly. In our experiment, the strong fluorescence background and Peak shifts in Raman spectra , as well as the enlarged layer spacing in XRD spectra, together confirmed that Li-ions were successfully intercalated into the graphite layers. The relative reflectivity of ultrathin graphite increased sharply in a wide range from 460 nm to 1500 nm after complete Li-ion intercalation. At a typical near-infrared wavelength 1500 nm for instance, the relative reflectivity is 0.28 for pristine graphite while 0.70 for fully lithiated graphite. Such reversible intercalated modulation in visible-near-infrared reflectivity of ultrathin graphite might provide a new way to design electrochromic coating, thermal camouflage or radar stealth systems, which also promotes further understanding and optical applications of graphene and other 2D materials.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhaoqian Yan,Zhihao Sun,Anran Li,Hongshou Liu,Zihao Guo,Lanling Zhao,Jinkui Feng,Lei Qian
With high theoretical capacity (926 mAh g −1 ) and safer voltage platform, Iron phosphide (FeP) as an anode material for lithium ion batteries has attracted a lot of attention. However, FeP also suffers serious capacity fading and unsatisfied rate capability, which are triggered by inferior intrinsic conductivity and large volume expansion. Herein, oriented by density functional theory (DFT) calculations, MOF-derived porous FeP nanorods modified by abundant P vacancies (denoted as V-FeP) were ingeniously designed via a simplified approach to alleviate the above obstacles. As a result, the V-FeP nanorods electrode delivered extraordinary specific capacity (1228.3 mAh g −1 at 0.1 A g −1 after 120 cycles) and long-cyclic performance (590.7 mAh g −1 at 2.0 A g −1 after 1000 cycles). Transmission electron microscopy, X-ray absorption fine structure, electron paramagnetic resonance and so on were used to character the V-FeP nanorods. The results indicated the supernormal electrochemical performances of V-FeP nanorods were originated from abundant P vacancies and good distribution of FeP nanoparticles in conductive carbon network, which enhanced electrical conductivity, provided more active sites, shortened the diffusion distances of Li ions and relieved the volume variations. The strategy demonstrates a further direction to effectively improve the lithium storage performance of transition metal phosphides.
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高影响因子
JOURNAL OF POWER SOURCES
·
2021
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IF 9.127
Mingming Xie,Xiaobo Zhu,Danqing Li,Zhizhao Xu,Yingjia Huang,Huanyi Zha,Mei Ding,Chuankun Jia
Along with the surging demand for rechargeable alkali-ion (Li + , Na + , or K + ) batteries , cost and availability of the battery materials become critical. In this paper, we report the use of spent asphalt , which is widely available and even poses environmental risks, to produce a high-performing universal Li/Na/K-ion host material. Taking advantage of a nano-Fe 2 O 3 template, the spent asphalt is converted into mesoporous carbon with an interconnected three-dimensional porous structure , high surface area, and numerous crystal defects . As an anode material for Li-ion batteries, the mesoporous carbon exhibits a reversible capability of 674.2 mA h g −1 at 0.2 A g −1 as well as excellent rate and cycling performance (258.7 mA h g −1 at 1.0 A g −1 after 1000 cycles) owing to the shortened diffusion path of ion and easier penetration of electrolytes. The carbon anode also delivers superior reversible capacities and cycling stability in Na-ion and K-ion batteries. With the potential to simultaneously tackle energy and environmental problems, the spent asphalt-derived mesoporous carbon is promising for large-scale applications.
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高影响因子
SOLID STATE IONICS
·
2021
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IF 3.785
Yawen He,Zhongbin Ye,Mohamad Chamas,Moulay Tahar Sougrati,Pierre-Emmanuel Lippens
The silicon based composite Si/Cu-Zn(ox)/C was prepared by ball milling from Si microparticles , Cu-Zn nanopowder heated at air and carbon black. The composite is formed by Si submicrometer particles, Cu-rich Cu x Zn, CuO , ZnO and C nanoparticles . The two oxides are electrochemically active during the first discharge, improving the nanostructuration of the composite and providing Cu nanoparticles that enhance the electronic conductivity with Cu x Zn and C. The nanostructuration helps to buffer the volume variations due to Li-Si alloying reactions during cycling. The composite is further nanostructured during the first cycles as shown by XRD and electrochemical measurements. The material was tested as anode material for Li-ion batteries, providing a reversible capacity of 800 mAh.g −1 during 100 cycles at current of 300 mA.g −1 and a good rate capability. The reversible capacity is mainly due to Li-Si alloying reactions and is stable after few cycles while the solid electrolyte interphase is stabilized after about ten cycles as shown by electrochemical impedance spectroscopy .
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高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Ailing Tian,Kailin Luo,Zhendong Li,Mingming Ma,Shun Li,Xingyi Wang,Deyu Wang,Zhe Peng
Lithium (Li) metal and alloy anodes are strongly attractive for next high-energy-density batteries , owing to their high theoretical specific capacity and low redox potentials . However, the fast electrode pulverization caused by large volume variation upon cycling inhibits the use of the Li metal and alloy anodes seriously, whereas the sluggish charge transfer and weak electrode/electrolyte interphase are mainly responsible for their uneven volume expansion and surface breaks, respectively. Herein, a versatile F–N–S doped lithiophilic interphase is obtained via a one-pot electrochemical fabrication process with high controllability, which exhibits high robustness, Li affinity and fast Li transfer, and significantly outperforms the single lithiophilic interphase obtained via chemical route. When this advanced interphase is applied to the copper or aluminum electrodes, great stabilizations of Li plating/stripping or Li insertion/extraction processes can be achieved. This work emphasizes the importance of the interphase composition for designing stable high-energy-density electrodes, and gives insights on a general and efficient remedy to boost the performances of the large-volume-change electrodes.
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高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 16
·6090-6100
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IF 10.182
Xinxin Wang,Wu Tang,Yang Hu,Wenqiang Liu,Yichao Yan,Liang Xu,Cong Fan
An insoluble small-molecule organic compound [N,N′-bis(2-anthraquinone)]-perylene-3,4,9,10-tetracarboxydiimide (PTCDI-DAQ) can be a high-performance cathode in Li-ion batteries (LIBs). In half cells, PTCDI-DAQ delivers a peak specific capacity of 229 mA h g−1, along with the good retention of 82% over 3 months. Meanwhile, PTCDI-DAQ can still hold a capacity of 46 mA h g−1 at 25 A g−1. By using the reduced state (Li4TP) of lithium terephthalate (Li2TP) as an organic anode in the all-organic Li-ion batteries (OLIBs), our OLIBs can realize a high-energy density of 296 W h kg−1cathode in the voltage range of 0.2–3.2 V and fulfill a long lifespan over 20 000 cycles. To the best of our knowledge, the comprehensive performance of our PTCDI-DAQ II Li4TP OLIBs is currently one of the best pure-organic LIBs in the world.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 14
·9309-9321
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IF 5.044
Zhao Xiaobin,Wang Wenbo,Huang Chenghao,Luo Lei,Deng Zhongmin,Guo Wei,Xu Jie,Meng Zhenghua
Cattail is widely abounding in wetlands and marshes and is usually considered as an abundant and inexpensive biomass lignocellulose resource due to its rapid growth. In this paper, a novel cellulose (named as TOCF) separator for Li-ion batteries (LIBs) is successfully fabricated from cattail fibers by 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO) oxidation and vacuum filtration. The proposed TOCF membrane shows good tensile strength (75 MPa), superior thermal dimensional stability, sufficient porosity (64.8%), outstanding liquid electrolyte uptake (323%) as well as large ionic conductivity (2.83 mS cm −1 ). Moreover, the Li/LiFePO 4 cell assembled using the TOCF separator demonstrates better discharge capacity and cycling stability than the cell with a commercial Celgard separator. Thus, the TOCF separator is a promising and low-cost candidate used in high-performance LIBs.
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高影响因子
危险品化学品经营许可证（带存储）