ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 12
·2108669
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IF 18.808
Zhilong Han,Shuping Li,Ruoyu Xiong,Zhipeng Jiang,Mengjun Sun,Wei Hu,Linfeng Peng,Renjie He,Huamin Zhou,Chuang Yu,Shijie Cheng,Jia Xie
High-energy density and ultra-long cycling lifespan are of great significance in pursuit of practical lithium–sulfur (Li-S) batteries, in which the construction of ultrathick, high-areal-capacity, and stable-cycling sulfur cathodes remains challenging. Here, a unique layered reinforced concrete structure (LRCS) is reported by integrating an ice-template method with incorporating carbon fibers in the thick electrodes for Li-S batteries. The LRCS enables aligned through-channel structure and intertwined conductive network, which lead to both fast kinetics of ions/electrons transport and strengthened electrode integrity to tolerate the volume change during cycling and the dimensional deformation under a high compaction density. Benefiting from the unique structure, the ultra-thick Se 0.05 S 0.95 @ pPAN cathode (20.2 mg cm −2 ) delivers a high capacity of 10 mAh cm −2 and excellent capacity retention of 80.8% over 140 cycles at a low electrolyte-to-sulfur ratio of 2 and a negative-to-positive capacity ratio of 2.7, corresponding to a calculated energy density of 390 Wh kg −1 . This investigation not only provides guidance for the design of thick sulfur electrodes but also paves the way for the development of practical Li-S batteries.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
Energy Material Advances
·
2022
·
IF 0
Renjie He,Sheng Lei,Mengchuang Liu,Mingsheng Qin,Wei Zhong,Shijie Cheng,Jia Xie
Microspinel LiMn2O4 (LMO) is a widely used cathode material in power lithium-ion batteries. However, inevitable Mn dissolution and dynamic phase instability will cause the degradation of microspinel LMO during cycling. Here, a low-tortuosity LMO (LMO-LT) electrode is fabricated by an ice-templating method, which exhibits enhanced dynamic phase stability, alleviated Mn dissolution, and rare particle microcracks during cycling. It is shown that the low-tortuosity electrode enables fast lithium-ion diffusion and thus small concentration polarization, leading to uniform electrochemical reaction within microregions of the LMO-LT electrode. Furthermore, the fast lithium-ion transport kinetics and even mesoscopic scale reactions of the LMO-LT electrode effectively alleviate irreversible phase transition and Mn dissolution as well as suppress crack generation in LMO particles. As a result, the full cell [negative-to-positive capacity ratio (N/P) = 1.1] with thick LMO-LT cathode (13 mg cm−2) and Li4Ti5O12 anode sustains 80.0% capacity over 200 cycles. The LMO-LT electrode further delivers 78.9% capacity of that at 0.1 C at the high rate of 5 C. This work provides an important strategy to enhance dynamic phase stability and suppress Mn dissolution at the mesoscopic scale, promoting the development of high-performance LMO electrodes.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
Advanced Energy Materials
·
2024
·Vol. 14
·期 31
·2400985
·
IF 24.4
Cheng Li,Ying Lin,Jun Liu,Fucheng Ren,Yuqi Wu,Zhongwei Lv,Jinxue Peng,Xuefan Zheng,Zhengliang Gong,Yong Yang
The all-solid-state lithium batteries (ASSLBs) stand as a promising candidate for the next generation of high-energy-density batteries with superior safety. Nevertheless, achieving high energy density in ASSLBs necessitates the simultaneous realization of high active material content and loading, posing a significant challenge in ensuring effective Li-ion conduction within the cathode. Notably, the inhomogeneous distribution of cathode particles causes high porosity and tortuosity within the composite cathodes, thereby adversely impacting the electrochemical performance of the battery. Herein, an in situ liquid-phase method for the fabrication of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) composite cathode is proposed. This strategy ensures the generation of uniformly distributed and densely packed composite cathode, establishing a well-networked conduction path that ensures exceptional electronic and ionic conductivity. ASSLBs utilizing LP-cathode exhibit outstanding electrochemical performance. It delivers a high capacity of 233.3 mAh g −1 at 0.05 C with superior rate capability and remarkable long-term cycling stability. Moreover, ASSLBs manifest exceptional electrochemical performance, even at a high cathode active material content of 80%. This underscores the efficacy of the liquid-phase method in constructing low-tortuosity electrodes and accelerating charge transport kinetics, thereby enhancing the overall performance of ASSLBs. This approach holds promise for addressing the challenges associated with achieving high energy density and facilitating the development of ASSLBs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 36
·19374-19383
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IF 11.9
Hukang Guo,Jianxiao Jiang,Chuanjie Fang,Liping Zhu
Covalent organic frameworks (COFs) with well-ordered nanopores and stable structures have excited exponential interest as potent membrane platforms for molecular separation in organic solvent systems. However, the fabrication of defect-free and crystalline COF membranes remains extremely challenging due to the poor processibility of COF powders. Herein, we report the facile in situ synthesis of highly crystalline COF membranes on the confined surface of porous substrates via contra-diffusion interfacial polymerization. The continuous imine-linked COF membranes with high structural rigidity exhibited robust chemical stability in organic solvents. The variable membrane thickness was achieved by tailoring the initial monomer concentration. Notably, the synthesized COF membranes displayed tunable solvent permeance and solute rejection with a linear dependence on their thickness. The linear relationship between the membrane thickness and pore tortuosity was further demonstrated, enabling the reasonable prediction of solvent permeance based on the pore-flow model. Owing to the regular hexagonal nanochannels, the COF membrane exhibited precise molecular sieving capability toward molecules with varying dimensions in the organic solvent. This work showcases the immense potential of crystalline COF membranes for molecular separation in harsh organic solvents.
研究领域:
材料科学
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化学工程
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膜技术
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Tianrui Zheng,Qiwen Chen,Guoyao Li,Tong Zhou,Yeqing Shen,Nan Zhang,Bowen Dong,Yuesheng Ning,Huanan Duan
Structural design of electrodes is a widely adopted approach towards enhanced electrochemical performance in various battery systems. However, in quasi-solid-state lithium metal batteries, research has predominantly focused on developing gel polymer electrolytes (GPEs), with limited attention given to utilizing electrodes with specialized structural design. Herein, by exploiting the excellent wettability and permeability of the GPE, high-loading NMC-811 cathodes featuring aligned channels achieved through freeze-casting are integrated with in-situ UV-polymerized poly (butyl acrylate) (PBA). The aligned channels in the freeze-cast electrodes provide low-tortuosity pathways for smooth Li + transport, facilitating rapid kinetics. Consequently, superior areal capacity can be delivered under high areal current density (e.g. 1 mAh cm −2 at 2 mA cm −2 and 0.7 mAh cm −2 at 3.8 mA cm −2 ), demonstrating the fast-charging capability of quasi-solid-state lithium metal batteries.
研究领域:
材料科学
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电化学
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电池技术
✓ 已验证
DOI
高影响因子
DESALINATION
·
2020
·
IF 7.098
Xuan Zhang,Shu Xiong,Chu-Xuan Liu,Liang Shen,Song-Lin Wang,Wan-Zhong Lang,Yan Wang
Substrate modification is advantageous to ameliorate the internal concentration polarization (ICP) phenomenon encountered by most thin-film composite (TFC) membrane in forward osmosis (FO) process, therefore promoting FO implementation to a large extent. Optimization of the intrinsic parameters of substrate (e.g. porosity and tortuosity) can generally be achieved by incorporating hydrophilic or pore-containing materials into the dope solution before the substrate fabrication. In this work, polyvinylidene fluoride (PVDF) substrate with embedded thermal-response poly (N-isopropyl acrylamide) (PNIPAM) microgels is employed for the construction of TFC-FO membrane, where the reversible shrinkage of PNIPAM microgels brings about a lower tortuosity and a higher porosity of the substrate at higher operation temperature, thereby mitigating the ICP impact of the TFC-FO membranes significantly. Effects of PNIPAM content on the properties of the substrates and the resultant polyamide (PA) layer, as well as the corresponding performance of the TFC-FO membranes were comprehensively investigated. The benchmarking shows that, TFC membrane with PNIPAM-modified substrate exhibits remarkably improved water flux of 40.2 L·m −2 ·h −1 and a reduced reverse salt flux of 10.1 g·m −2 ·h −1 , with DI water as feed (50 °C) and 1 M NaCl as draw solution (ambient temperature), which suggests its great potential for treating feed solution with relatively high temperature in the practical applications, for instance, the dyestuff wastewater enrichment.
研究领域:
膜科学
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环境工程
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水处理
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）