JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wenbo Li,Jinyang Dong,Yong Zhao,Jiayu Zhao,Haoyu Wang,Ning Li,Yun Lu,Jianan Hao,Yujia Wu,Youyou Fang,Yali Li,Qiongqiong Qi,Yuefeng Su,Feng Wu,Lai Chen
Li-rich Mn-based (LMR) layered oxides are considered promising cathode materials for high energy–density Li-ion batteries. Nevertheless, challenges such as irreversible oxygen loss at the surface during the initial charge, alteration of the bulk structure, and poor rate performance impede their path to commercialisation. Most modification methods focus on specific layers, making the overall impact of modifications at various depths on the properties of materials unclear. This research presents an approach by using doping to adjust both surface and bulk properties; the materials with surface and bulk fluoride anion doping are synthesised to explore the connection between doping depth, structural and electrochemical stability. The surface-doped material significantly improves the initial Coulombic efficiency (ICE) from 77.85% to 85.12% and limits phase transitions, yet it does not enhance rate performance. Conversely, doping in bulk stands out by improving both rate performance and cyclic stability: it increases the specific discharge capacity by around 60 mAh g −1 and enhances capacity retention from 57.69% to 82.26% after 300 cycles at 5C. These results highlight a notable dependence of material properties on depth, providing essential insights into the mechanisms of surface and bulk modifications.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 23
·14539-14544
·
IF 3.269
Chao Li,Haochen Tan,Jingfang Pei,Chuan Wang,Cong Fan,Fangyi Huang,Bei Cao,Minghui Hao,Yuanxun Li,Zhihong Wang,Jingze Li
A novel polymer (PTPBQ) with alternating terephthalate (TP) and benzoquinone (BQ) moieties is synthesized for the first time as an organic cathode for Li-ion batteries. Both TP and BQ moieties probably could remain electrochemically active and thus may make PTPBQ realize a maximum 4-electron redox behaviour and a theoretical specific capacity of up to ∼390 mAh g−1. In its practical application, Li-ion half cells based on PTPBQ can realize discharge capacities of ∼110 mAh g−1 on average for 400 cycles (40 mA g−1, 0.1C), and ∼180 mAh g−1 on average for 200 cycles (80 mA g−1, 0.2C) when the carbon additive is augmented to 40 wt%.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 19
·9339-9349
·
IF 8.867
Zhenggang Zhang,Zhe Peng,Jieyun Zheng,Susu Wang,Zixuan Liu,Yujing Bi,Yousi Chen,Gang Wu,Hong Li,Ping Cui,Zhaoyin Wen,Deyu Wang
Attempts to utilize lithium metal in secondary batteries are seriously restricted by its uncontrollable side reactions with the electrolyte solvent. Here we utilize a protective porous structure based on the pyrolyzed PAN binder to stabilize the electrolyte/lithium interface to prolong its working life. With the increase of pyrolysis temperatures, the treated PAN fibers possess two mutational points in mechanical properties located at ∼300 & ∼700 °C, and exhibit carbon-like characteristics at ∼400 °C and higher. Compared to the control electrode, the cyclic life-span of the treated electrodes can increase 1.8 times at the first mutational point, and surprisingly rise to 12 & 7 times for the samples pyrolyzed at 400 & 500 °C, then fall back to 1.6 times at the second mutational point. These results reveal that the stable operation of lithium plating/stripping could be provided by the internal interwoven SEI layer grown on the carbon-like binder network with appropriate rigidity. Among the investigated systems, the protective structure treated at 400 °C can stably operate for 350 cycles with an average coulombic efficiency as high as ∼98%, which is the best efficiency recorded for carbonate-based electrolytes to date.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jiankun Lin,Chengwei Ma,Chunli Li,Xinyi Zou,Wen Chen,Jiangqi Zhou,Peichao Lian
Anode-free Li metal batteries are an excellent choice for developing the next generation of high-energy-density battery systems. However, due to poor chemical compatibility between the current collector and electrolyte interface, the Li electrodeposition on current collectors faces a huge challenge of rapid capacity degradation in anode-free Li metal batteries. Herein, a strategy for modifying an ultrathin black phosphorene (BP) mixed ion/electron conductor interface layer on the surface of a current collector by relying on pressure is proposed. The BP hybrid interface layer is formed in situ on the surface of the current collector solely by pressure compared with traditional current collector modification technology, and there is no powder shedding phenomenon in the absence of a binder. Moreover, the Cu-NCM811 cell matched with high mass loading cathodes exhibits excellent capacity retention and an average Coulombic efficiency of 99.1%. The relevant result has established the foundation for the development of long cycling anode-free Li metal batteries.
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PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 26
·14037-14046
·
IF 6.895
Shenghui Zheng,Junpeng Shi,Xiaoyan Fu,Chengcheng Wang,Xia Sun,Changjian Chen,Yixi Zhuang,Xiaoyan Zou,Yuechan Li,Hongwu Zhang
In this paper, we have designed long afterglow luminescent MgGeO3:Mn2+,Yb3+,Li+ (MGO) nanoparticles in the first (NIR-I) and second (NIR-II) biological windows. Yb3+ ions served not only as the trap center to enhance the NIR-I long afterglow emission of Mn2+ at 680 nm, but also as an emitting center to produce a NIR-II long afterglow emission at ∼1000 nm. Furthermore, we have found the addition of Li+ can greatly increase the NIR-II afterglow emission of Yb3+ and the optimal amount of Mn2+, Yb3+ and Li+ was found to be 0.1, 0.5 and 0.5 mol%, respectively. The MGO nanoparticles synthesized using sol–gel methods showed a uniform morphology with a diameter of 50–100 nm, which were suitable for applications in bioimaging. More importantly, we have found MGO nanoparticles can be effectively excited to produce long persistent NIR-I and II luminescence using soft X-rays, suggesting that low dosage soft X-rays can also serve as a more powerful and deep tissue excitation source to recharge MGO nanoparticles. Furthermore, the MGO nanoparticles can also be re-excited to produce photo-stimulated emission under the irradiation of 650 and 808 nm NIR lasers. The in vivo imaging results have shown that MGO nanoparticles modified with folic acid (FA) can effectively realize super long-term targeted in vivo imaging of inflammation with a high sensitivity via recharging using soft X-rays and NIR lasers, which can provide not only an accurate diagnosis of inflammation, but also long-term monitoring of possible changes in the focus of inflammation in real time.
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高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Amir Abdul Razzaq,Ganwen Chen,Xiaohui Zhao,Xietao Yuan,Jiapeng Hu,Ziwei Li,Yufeng Chen,Jiabin Xu,Rahim Shah,Jun Zhong,Yang Peng,Zhao Deng
Sulfurized polyacrylonitrile (SPAN) represents a unique class of cathode material for lithium sulfur (Li-S) batteries as it eradicates the polysulfides shuttling issue in carbonate-based electrolyte. However, due to the essential chemical S-linking and organic nature of SPAN, the active mass percentage and rate capability are two bottleneck issues preventing its ultimate deployment outside of laboratories. In the current work, aiming to endow both the charge conductivity and catalytic activity to SPAN for maximizing the redox kinetics of S conversion, a freestanding nanofibrous SPAN cathode embedding conductive CNTs and atomically dispersed Co centers is fabricated via multivariate electrospinning. While the CNTs enable dramatically enhancing the fiber conductivity and generating mesoscopic porosity for facilitating charge and mass transportation, the cross-linking of SPAN by Co-N 4 S motifs creates extra charge conduction pathways and further serves as the catalytic active sites for expediting redox S conversion. As a result, an extraordinary Li-SPAN performance is achieved with a high specific capacity up to 1856 mAh g −1 @0.2 C, a superb rate capability up to 10 C, and an ultra-long battery life up to 1500 cycles@1 C. Consequently, our study here provides insights into the adoption of coordination chemistry to maximize the sulfur utilization by ensuring a more complete redox conversion from SPAN to Li 2 S, and vice versa .
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IONICS
·
2020
·Vol. 26
·期 7
·3359-3365
·
IF 2.394
Xu Ruijie,Lin Xiaogui,Xu Jinbao,Lei Caihong
The water absorption property of the coated separator directly affects the electrochemical performance of a Lithium-ion battery. For the water-based coated separator, the water absorption is directly dependent on the binder and ceramic components. In this work, β-cyclodextrin is chosen as the binder, and its hydrophilicity is regulated by chemical oxidation, while titanium dioxide (TiO 2 ) is used as the ceramic component. It is found that the water absorption of the coated separator using modified β-cyclodextrin is lower than that of commercial aqueous binders such as PVA. In addition, the Li-ion battery assembled with the coated separator shows better discharge capacity retention. At 8 C rate discharge, the discharge capacity of the battery using coated separator is measured at 123 mAhg − 1 , and the capacity retention is up to 88%. This work provides a new idea to modify the water-based coated separator with reduced water absorption in the storage stage.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xueqian Ji,Yuxing Xu,Hailan Feng,Pengfei Wang,Yuncheng Zhou,Jiechen Song,Qing Xia,Qiangqiang Tan
To improve the initial Coulombic efficiency, cycling stability, and rate performance of the Li-rich Mn-based Li1.2Mn0.54Ni0.13Co0.13O2 cathode, the combination of LiMn1.4Ni0.5Mo0.1O4 coating with Mo doping has been successfully carried out by the sol–gel method and subsequent dip-dry process. This strategy buffers the electrodes from the corrosion of electrolyte and enhances the lattice parameter, which could inhibit the oxygen release and maintain the structural stability, thus improving the cycle stability and rate capability. After LiMn1.4Ni0.5Mo0.1O4 modification, the initial discharge capacity reaches 272.4 mAh g–1 with a corresponding initial Coulombic efficiency (ICE) of 84.2% at 0.1C (1C = 250 mAh g–1), far higher than those (221.5 mAh g–1 and 68.9%) of the pristine sample. Besides, the capacity retention of the coated sample is enhanced by up to 66.8% after 200 cycles at 0.1C. Especially, the rate capability of the coated sample is 95.2 mAh g–1 at 5C. XRD, SEM, TEM, XPS, and Raman spectroscopy are adopted to characterize the morphologies and structures of the samples. This coating strategy has been demonstrated to be an effective approach to construct high-performance energy storage devices.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Yang Zhan,Shao-hua Luo,Jian Feng,Lin Zhang,Xin Liu,Qing Wang,Ya-hui Zhang
The lithium-oxygen batteries (LOBs) have gained extensive interest in the past decade, but are plagued by slow reaction kinetics and induced large-voltage hysteresis. Therefore, developing extremely capable catalysts to enhance catalytic behavior and mitigate oxidation-reduction overpotential of LOBs is of huge challenge and significance. Attributable to their economically friendly and great activity, transition metal oxides (TMO) have incurred lots of attention as alternative electrocatalysts to replace the currently used noble metal-based catalysts. In this work, we fabricate a highly efficient TMO (the MIL-88A heated at 500 °C under protective flow, M8-Fe 3 O 4 @NC-500) electrocatalyst as advanced cathodes, which attributed to its unique structure, numerous dendritic-shaped carbon layer was anchored inplane into the micrometer-long spindle-shaped prisms with evenly distribution and contains abundant Fe–N/Graphitic N active sites. Therefore, the LOBs (based on M8-Fe 3 O 4 @NC-500/AB cathode) deliver superior electrochemical performance with large specific capacities of 14866.1 mAh g −1 , low overpotentials (1.31 V), and steady cycling stability (553 cycles, limited 500 mAh g −1 , under 0.05 mA cm −2 ). Our work provides a novel vision to rationally design and synthesize a powerful TMO electrocatalyst (with the 2D carbon nanosheet coating) for the LOBs cathode.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 46
·23357-23365
·
IF 9.931
Anyu Su,Qiang Pang,Xin Chen,Jiajun Dong,Yingying Zhao,Ruqian Lian,Dong Zhang,Bingbing Liu,Gang Chen,Yingjin Wei
Li3V2(PO4)3 (LVP) has been highlighted as a promising cathode material for lithium ion batteries, but it suffers from poor rate capability and rapid capacity decay due to sluggish electrode kinetics and vigorous electrode/electrolyte side reactions at high voltage. In this study, an inexpensive aqueous lithium poly-acrylic acid (LiPAA) binder was developed to deftly solve the shortcomings of the LVP material by tailoring the functional groups in the binder. The good adhesion and cohesion properties of the LiPAA binder ensured a close linkage between the active LVP particles, conductive additives and current collector, which formed a stable and conductive network in the electrode. In addition, the reversible H+/Li+ exchange in LiPAA effectively assisted the transport of Li+ ions at the electrode interface, which allowed the establishment of a Li+ conductive pathway without considerable degradation of the electrolyte. Due to these advantages, the LVP electrode containing the LiPAA binder exhibited significantly improved electrochemical performance compared to the electrode that employed the traditional polyvinylidene fluoride binder. The new electrode configuration showed a large specific capacity of 107 mA h g−1 at 70C rate and a high capacity retention of 91% was obtained after 1400 cycles at 10C rate, showcasing the great potential of this aqueous binder in lithium ion batteries.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kejin Jiao,Shujie Liu,Yanyan Ma,Shuo Chen,Liying Wei,Jianhua Yan
Lithium (Li) metal battery is a promising next generation energy storage system due to its high energy density , but what hinders its commercialization is the safety hazard of Li-anode, especially under high current densities. Here, we report a dual strategy of using electronic conductive black TiO 2−x nanofiber films to construct composite Li-metal anodes with stable 3D networks and applying an in-situ polymerized ionic conductive gel-electrolyte to construct efficient quasi-solid-state Li-batteries (QSSLBs). The 3D nanofibrous Li-anode shows a stable and small nucleation barrier and can run stably (>1600 h) at a high current density of 10 mA/cm 2 . When matching with high-loading cathodes of LiFePO 4 , the QSSLBs exhibit excellent long-term cycling stability (>500 cycles) and high-rate capability (>1 C). In addition, the in-situ polymerization strategy can be incorporated with the commercial lamination manufacturing to produce 63-Ah pouch cells of LiFePO 4 ||graphite, which deliver a high initial Coloumbic efficiency, a large energy density at 0.3 C, excellent rate capability from 0.25 to 2 C, and long-term cycling performance at 0.3 and 1 C, showing potential commercial prospects.
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DESALINATION
·
2025
·
IF 9.8
Fengrui Yang,Xinyu Ma,Jun Wei,Xuanhua Chen,Zhi Wang
The efficient extraction of lithium from salt-lake brine still faces challenges due to the insufficient performance of nanofiltration (NF) membranes. In this study, a nanofiltration membrane was fabricated by first pre-crosslinking polyethyleneimine (PEI) with 1,3,5-triformylphloroglucinol (Tp), followed by interfacial polymerization (IP) with trimesoyl chloride (TMC). The pre-crosslinking step incurred no amine loss. However, the higher molecular weight and increased steric hindrance of the product reduced its subsequent crosslinking with TMC. An optimal balance enables the simultaneous enhancement of both the overall crosslinking density, which is contributed by both pre-crosslinking and TMC crosslinking, and the positive charge density of the membrane. The optimized membrane (Tp 0.12) achieved a pure water permeability of 8.57 L·m −2 ·h −1 ·bar −1 and an ideal LiCl/MgCl₂ selectivity of 32.9, representing 179 % and 700 % of the values for the pristine membrane, respectively. Moreover, the optimal membrane remained effective even when the Mg 2+ /Li + ratio in the feed was as high as 140 or the total salt concentration reached up to 10,000 ppm. This work provides a simple and efficient new pathway for preparing high-performance selective nanofiltration membranes for lithium extraction.
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