APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hui Luo,Yunshu Yang,Liwen Lu,Guangxu Li,Xinhua Wang,Xiantun Huang,Xiaoma Tao,Cunke Huang,Zhiqiang Lan,Wenzheng Zhou,Jin Guo,Haizhen Liu
Li–Mg–B–H composite (2LiBH 4 + MgH 2 ) possesses a very high hydrogen storage capacity of 11.4 wt%. However, it still suffers from high operating temperature, slow kinetics, and poor reversibility. In this work, the two-dimensional Ti 3 CN MXene was first synthesized and then introduced into the Li–Mg–B–H composite. The addition of 5 wt% Ti 3 CN reduces the onset dehydrogenation temperature of the 2LiBH 4 + MgH 2 composite by about 50 °C and shortens the induction period of the LiBH 4 decomposition at 400 °C from >90 min to <10 min. The reversible capacity maintains at 8.3 wt% after 20 cycles, with a capacity retention ratio of 93%. Microstructure studies show that Ti 3 CN will partially transform to a highly-dispersed nano-TiB 2 with particle size around 5 nm. Such nano-TiB 2 could serve as an active catalyst to significantly improve the kinetics and reversibility of the Li–Mg–B–H composite. This work offers a strategy to enhancing the hydrogen storage performance of the advanced metal borohydride-based composites by addition of the MXene material and provides some new insights in understanding the role of MXene in tailoring the hydrogen storage properties of the Li–Mg–B–H composite.
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高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 15
·e202200817
·
IF 9.14
Jiarong He,Tao Tao,Fan Yang,Zhipeng Sun
Graphical Li? Na(h) . The intercalation mechanism and cathode electrolyte interphase property of Li-free polyanionic cathodes such as Na 3 V 2 (PO 4 ) 3 and Na 3 (VOPO 4 ) 2 F are systematically demonstrated. They show intriguing electrochemical performances for lithium-ion batteries towards a sustainable society due to the abundance of Na resource, providing appropriate crystallographic sites for Li + /Na + intercalation/deintercalation due to the existence of pillar Na + ion residing in the structure. Although lithium-ion batteries (LIBs) are promising towards high energy density and superior safety energy storage systems (ESS), severe depletion of Li reserve cannot meet the ever-growing demand for LIBs due to the uneven distribution and limited amount of Li resource. Li-free polyanionic cathodes, such as Na 3 V 2 (PO 4 ) 3 (NVP) and Na 3 (VOPO 4 ) 2 F (NVOPF), show intriguing electrochemical performances with prospective future for LIBs due to their appropriate crystallographic sites, robust host structure, and abundant Na resource. In this work, NVP and NVOPF were systematically investigated as cathodes for LIBs using different voltage windows of 2.5–4.3, 2.0–4.3, and 1.5–4.8 V, along with their electrochemical mechanisms, cathode electrolyte interphase properties, and electrode morphologies for comparison. Ex-situ X-ray diffraction, ex-situ X-ray photoelectron spectroscopy, and post-mortem scanning electron microscopy revealed that their mechanisms shifted from a predominant Na + intercalation/deintercalation in the first charging/discharging to a mixed Li + /Na + intercalation/deintercalation at the subsequent cycling. Due to the residual Na + acting as pillar in the structure, NVP and NVPF could serve as robust host framework, providing appropriate crystallographic sites for repeated Li + /Na + intercalation/deintercalation. NVP electrode delivered a higher discharge capacity of 107.6 mAh g −1 with superior capacity retention of 84.3 % after 1000 cycles (2.5–4.3 V, 100 mA g −1 ) than NVOPF electrode (97.3 mAh g −1 , 68.8 %). Electrode polarization and kinetic analysis manifested one energetically similar and two energetically nonequivalent crystallographic Na sites within the R c and I 4 /mmm polyanionic structure of NVP and NVOPF. This work comprehensively demonstrates the feasibility and prospect of sodium-based NVP and NVOPF polyanions serving as advanced Li-free cathodes for LIBs, which provides novel insights into seeking Li-free candidates as prospective cathodes for LIBs towards a more sustainable society and a cost-effective battery manufacturing system.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Ziming Qiao,Zhipeng Yang,Mengke Li,Yi Feng,Xiongwei Qu,Hemi Qu,Xiaojie Zhang
Two quaternary pyridinium-type cationic-based porous organic frameworks (DB-POF and LB-POF) were first synthesized via “one-pot” polymerization and were incorporated into a PEO/LiTFSI matrix as fillers to prepare a series of solid polymer electrolytes (SPEs) . The obtained quaternary pyridine-type cationic-based POFs not only have higher polarizability through the characteristic of skeleton charge but also have a stable structure and simple preparation, making them a good candidate material for achieving rapid Li+ conductivity in SPEs. Therefore, POFs could be incorporated into PEO-based SPEs that will have a positive impact on the ion transport capacity and the mechanical properties of SPEs and also increase the stability of the lithium metal anode. Among the obtained membranes, the PEO-LB-10% electrolyte exhibits the best ion conductivity, up to 5.8 × 10–4 S cm–1 at 90 °C, and has outstanding mechanical properties, and the tensile strength can reach 8.61 MPa. Significantly, the Li–S battery containing the PEO-LB-10% electrolyte indicates superior electrochemical performance, with an excellent initial discharge specific capacity of 906 mAh g–1 at 0.2 C. After 500 cycles at 1 C, its capacity remained at 472 mAh g–1, with an attenuation rate of 0.037% per cycle.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Bin-Mei Zhang,Yu-Shan Zhang,Mao-Cheng Liu,Jun Li,Chun Lu,Bingni Gu,Ming-Jin Liu,Yu-Xia Hu,Kun Zhao,Wen-Wu Liu,Wen-Jun Niu,Ling-Bin Kong,Yu-Lun Chueh
A facile method of chemical welding was proposed to construct the diamine molecules (xDM, x = 2, 3, 4, 6 and 8) pillared- and strained-graphene oxides (GO) with controllable interlayer spacing via the dehydration condensation reaction between GO and xDM. The interlayer spacing of xDM pillared- and strained-GO (GO-xDM) is controllably enlarged by choosing the length of xDM, which determines the pillaring effects. The GO-xDM exhibits a low diffusion barrier and ultrafast Li + diffusion dynamics due to its enlarged interlayer spacing, which leads the excellent Li + storage rate capability. The effects of interlayer spacing on Li + diffusion dynamics are clarified that GO-2DM with the interlayer spacing of 0.911 nm displays the excellent Li + storage performance and fast Li + diffusion dynamics (D Li+ =2.4 × 10 −7 cm 2 s −1 ). The GO-2DM presents a high capacity of 291.8 mAh g −1 at a current density of 0.1 A g −1 and a high-rate capability of 120.8 mAh g −1 at a current density of 5.0 A g −1 . The GO-2DM//AC lithium-ion hybrid capacitor delivers a high energy density of 103.6 Wh kg −1 at a power density of 55.8 W kg −1 , even reaches 2777.8 W kg −1 at a power density of 61.1 Wh kg −1 . The approach of chemical welding provides a novel perspective for controllably enlarging interlayer spacing and designing two-dimensional (2D) energy storage materials with high-rate capability.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiao Yu,Qi Liu,Zhenqian Wu,Wenxia Zhao,Ruimei Xu,Yong Liu
Flexible and foldable Li-ion batteries (LIBs) are presently attracting immense research interest for their potential use in wearable electronics but are still limited to electrodes with very small mass loading, low bending/folding endurance, and poor electrochemical stability during repeated bending and folding movements. Moreover, one-dimensional (1D) structured electrode materials have shown excellent electrochemical performance but are still restricted by the high cost and complicated fabrication process. Here, we present a very simple yet novel approach for fabricating extra-long Li4Ti5O12 (LTO) and LiCoO2 (LCO) nanofiber precursors by directly stirring the reagents in an atmospheric vessel. In addition, we present multilayer pyramid/inverted pyramid interlocking inside the LTO and LCO nanofiber films as well as between films and current collectors, which can create strengthened interfacial bonding like a zipper and tangentially disperse the strains generated during folding through the pyramidal planes and edges, leading to the realization of thick-film electrodes with outstanding electrochemical stability during folding movements. The foldable LIBs that are assembled with LTO and LCO nanofiber electrodes at a practical level of mass loading (14.9–19.4 mg cm–2) can maintain 102% of the initial capacity after 15 000 times of fully folding (180°) motions.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Wenwen Li,Sanpei Zhang,Bangrun Wang,Sui Gu,Dong Xu,Jianing Wang,Chunhua Chen,Zhaoyin Wen
Solid polymer electrolytes (SPEs) have shown extraordinary promise for all-solid-state lithium metal batteries with high energy density and flexibility but are mainly limited by low ionic conductivity and their poor stability with lithium metal anodes. In this work, we propose a highly ordered porous electrolyte additive derived from SSZ-13 for high-rate all-solid-state lithium metal batteries. The nanoporous adsorption effect provided by the highly ordered porous nanoparticles in the poly(ethylene oxide) (PEO) electrolyte is found to significantly improve the Li+ conductivity (1.91 × 10–3 S cm–1 at 60 °C, 4.43 × 10–5 S cm–1 at 20 °C) and widen the electrochemical stability window to 4.7 V vs Li+/Li. Meanwhile, the designed PEO-based electrolyte demonstrates enhanced stability with the lithium metal anode. Through systematically increasing Li+ diffusion, widening the electrochemical stability window, and enhancing the interfacial stability of the SSZ-composite electrolyte (CPE) electrolyte, the LiFePO4/SSZ-CPE/Li cell is optimized to deliver high rate capability and stable cycling performance, which demonstrates great potential for all-solid-state energy storage application.
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ACS Applied Energy Materials
·
2018
·
IF 0
Kai Yang,Lei Zhong,Yudi Mo,Rui Wen,Min Xiao,Dongmei Han,Shuanjin Wang,Yuezhong Meng
Lithium sulfur battery is highly appealing for energy storage because of its high theoretical capacity and energy density. Nevertheless, as one of the pivotal problems, the shuttling of soluble polysulfide intermediates hinders its practical application. In this work, we employ an electronic conductive carbon material and a lithium ion conductive block polymer (lithium sulfonated poly(styrene-ethylene-butylene-styrene), Li+-SSEBS) to fabricate a functional separator by a simple coating method. The functional coating on the PP separator exhibits excellent electronic conductivity for reactivating the active materials, good lithium ion conductivity for facilitating lithium ion transport, and great ionic selectivity for the suppressing polysulfide shuttle. With this separator, the battery shows a high initial discharge capacity of 1066 mAh g–1 and excellent capacity retention of 762.7 mAh g–1 after 350 cycles at 0.5 C. It also exhibits excellent rate performance with a high capacity of 750 mAh g–1 at 2 C and good recovery capability. Furthermore, a correction strategy has been adopted to investigate the anti-self-discharge behavior of Li–S battery, which is more reasonable and precise than reported method. The results demonstrate that the SEBS-based functional separator can endow the enhanced electrochemical performance and anti-self-charge capability of Li–S battery.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 12
·6455-6463
·
IF 7.443
Kunlei Zhu,Xiaoyan Liu,Jiangyong Du,Jianhua Tian,Yun Wang,Shengzhong Liu,Zhongqiang Shan
There are few reports on mesoporous anatase TiO2 nanosheets being synthesized without additives and ex situ templates under mild conditions. In this study, mesoporous single-grain layer anatase (MSGLA) TiO2 nanosheets were first synthesized in situ without additives in a new methanol–tetrabutyl titanate (TBT) system on a large scale using a simple and easily reproducible method. The formation mechanism of the MSGLA TiO2 nanosheets was investigated in detail. The results suggest that MSGLA TiO2 nanosheets can be obtained after a simple thermal treatment of amorphous TiO2 sheets that are converted in situ from the precursor Ti(OC4H9)4−n(OCH3)n (1 ≤ n ≤ 4) (TBM), which is gained easily via the transesterification reactions of TBT and anhydrous methanol at room temperature. Moreover, the MSGLA TiO2 nanosheets were applied successfully as anode materials for Li-ion batteries (LIB) and exhibited a discharge capacity of ∼73 mA h g−1 with obvious voltage plateaus over 4000 cycles (a test time of ∼50 days) at 5 C (1 C = 170 mA g−1) and Coulombic efficiencies of each cycle approaching 100%, highlighting them as promising materials for long-term LIB.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Liye Li,Pengcheng Liu,Kongjun Zhu,Jing Wang,Guoan Tai,Jinsong Liu
With the wearable electronics progressing rapidly, the demand for flexible, long-life and low-cost electrodes of Li-ion batteries (LIBs) becomes more and more urgent. Due to the abundant resources and low cost, silica (SiO 2 ), especially the amorphous one, has attracted a lot of interests on the application of anode materials for LIBs. However, SiO 2 still suffer from the poor cycling performance mainly caused by the huge volume change during cycling like other alloy-type materials. Furthermore, it remains a challenge to fabricate the SiO 2 –based flexible electrode. Herein, we propose a facile in situ strategy to fabricate the electrospun robust free-standing SiO 2 /carbon nanofibers (denoted as in-SCNFs) film constructed by N-doped carbon nanofibers encapsulating uniformly amorphous SiO 2 nanoparticles . The in situ synthesized finer SiO 2 nanoparticles in the in-SCNFs are uniformly encapsulated in flexible carbon nanofibers, which can effectively buffer the volume change. Furthermore, the robust in-SCNFs film possesses the excellent mechanical flexibility and strength. So, when served as the free-standing anode of LIBs, the in-SCNFs film exhibits superior cycling performance. A discharge specific capacity of 405 mAh/g can be delivered even after a long-term 1000 cycles at a large current density of 500 mA/g, and the retention is up to 115%. It is an exciting finding that the in-SCNFs film is also a long-life anode of Na-ion batteries (NIBs). The 99% of initial capacity can be kept after 250 cycles at 500 mA/g. To our best knowledge, this is the first report on the application of SiO 2 /C composite for NIBs. These results suggest that the as-fabricated in-SCNFs film can become one promising free-standing long-life anode for LIBs and NIBs.
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RSC Advances
·
2016
·Vol. 6
·期 55
·50173-50179
·
IF 3.289
Song Li,Song Ye,Tianhua Liu,Zhuang Guo,Huiyun Wang,Deping Wang
ZnO quantum dots (QDs) with tunable size and photoluminescence can be achieved simply by controlling their growth during the sol–gel synthesis process. However, the role of alkali metal hydroxide MOH (M = Li, Na or K) as the reactant in the growth of ZnO QDs is still controversial. In this work, we carried out a comprehensive study on the growth of ZnO QDs by using different types of MOH as the reactant under different reaction temperatures and in different solvents. The results reveal that the growth of ZnO QDs is considerably governed by MOH through the co-effect of OH− and M+ ions, which can facilitate and hinder the growth, respectively. Further investigations suggest that the hindering effect caused by M+ cations is strongly dependent on the amount of OH− anions around the ZnO QD surface and follows the trend of Li+ > Na+ > K+. Moreover, the dual role of the reactant MOH can also be confirmed when altering reaction temperature and solvent. The photoluminescence of ZnO QDs shows size-dependence and can be easily tuned over a wide range from purple to yellow via adjusting the reaction parameters. This research establishes a fundamental understanding on the growth of ZnO QDs from the role of the reactant MOH point of view, which may benefit the controllable growth of ZnO QDs.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Haizhen Liu,Liwen Lu,Hui Luo,Jiayi Deng,Guangxu Li,Hua Ning,Yi Fan,Cunke Huang,Zhiqiang Lan,Wenzheng Zhou,Jin Guo,Xinhua Wang
The Li-Mg-B-H composite (2LiBH 4 + MgH 2 ) is acknowledged as a promising material for hydrogen storage due to its large hydrogen capacity (11.4 wt.%). However, the sluggish kinetics and poor reversibility make it difficult to be practically used. In this work, the hydrogen storage performances of 2LiBH 4 + MgH 2 have been significantly improved by a hybrid of bulk NbC and layered Nb 4 C 3 MXene (denoted as “Nb-C”). The 2LiBH 4 + MgH 2 + 6 wt.% Nb-C can release 8.5 wt.% H 2 within 30 min at 400°C and the dehydrogenated composite can absorb 9.3 wt.% H 2 within 30 min at 350°C and 7.5 MPa H 2 . The reversible dehydrogenation capacity maintains at 8.4 wt.% after 24 cycles, with a capacity retention ratio of 95.4%. By contrast, the undoped 2LiBH 4 + MgH 2 suffers from serious capacity degradation, with the capacity decreased dramatically to 3.5 wt.% after 3 cycles. Microstructural studies revealed that the doped composite has uniform particle and elemental distributions and possesses various multiphase interfaces of LiH/MgB 2 /NbC/Nb 4 C 3 , which is beneficial to hydrogen diffusion during the hydrogen uptake and release process. Theoretical studies by first principle calculation presented an extended bond length of the Mg-H and B-H bonds in the 2LiBH 4 + MgH 2 + NbC system, which may also explain the improved hydrogen storage properties of 2LiBH 4 + MgH 2 by addition of Nb-C. This work provides new insights into the role of transition metal carbides in regulating the Li-Mg-B-H hydrogen storage materials both experimentally and theoretically.
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高影响因子
mSystems
·
2024
·
IF 5
Hong Xue,Yitian Wang,Chunfeng Mei,Lili Han,Mengxiong Lu,Xuan Li,Ting Chen,Fengyun Wang,Xudong Tang
Lactose intolerance (LI) is a prevalent condition characterized by gastrointestinal symptoms that arise following lactose consumption. Recent evidence suggests that the gut microbiome may influence lactose levels in the gut. However, there is limited understanding regarding the alterations in microbiota and metabolism between individuals with LI and non-LI. This study conducted a paired-sample investigation utilizing data from the American Gut Project (AGP) and performed metagenomic and untargeted metabolomic analyses in a Chinese cohort to explore the interaction between the gut microbiome and serum metabolites. In addition, fecal microbiota transplantation (FMT) experiments were conducted to further examine the impact of the LI-associated gut microbiome on inflammatory outcomes. We identified 14 microbial genera that significantly differed between LI and controls from AGP data. Using a machine learning approach, group separation was predicted based on seven species and nine metabolites in the Chinese cohort. Notably, increased levels of Escherichia coli in the LI group were negatively correlated with several metabolites, including PC (22:6/0:0), indole, and Lyso PC, while reduced levels of Faecalibacterium prausnitzii and Eubacterium rectale were positively correlated with indole and furazolidone. FMT-LI rats displayed visceral hypersensitivity and an altered gut microbiota composition compared to FMT-HC rats. Metagenomic and metabolomic analyses revealed an enrichment of MAPK signaling in LI, which was confirmed by FMT-LI rats showing higher expression of ERK and RAS, along with increased concentrations of proinflammatory cytokines. This study provides valuable insights into the disrupted microbial and metabolic traits associated with LI, emphasizing potential microbiome-based approaches for its prevention and treatment.
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高影响因子
危险品化学品经营许可证（带存储）