COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Haofei Sima,Bo Liu,Jingshi Liang,Xiaolin Shi,Chunling Zhang
Highly conductive and super-tough acrylamide hydrogels are essential for the development of flexible electronics. However, the inherent electrical and mechanical deficiencies of polyacrylamide (PAM) impede their utilization in flexible electronics. To address this challenge, a novel double-crosslinking method for rapid gelation based on an MXene-initiated poly (acrylamide/vinylimidazole) (MPAV) system is presented in this paper. MXene rapidly initiated the copolymerization of acrylamide with ionic liquids and acted as a physical cross-linking point for dynamic and reversible physical interactions with the polymer chains. The copolymerization of ionic liquids solved the problem of MXene aggregation in the medium and enabled the ionic conductivity mechanism of directional movement of free ions inside the MPAV hydrogel. MPAV hydrogels exhibited high electrical conductivity (2.28 S/m), excellent electromagnetic interference shielding efficiency (SE t > 35 dB), and sensitive strain sensing properties (maximum gauge factor: 14.69 and maximum sensitivity: 0.124 kPa -1 ). The well-designed MPAV double crosslinked hydrogel also displays remarkable mechanical properties (elongation: 457% and compressibility: 80%) and self-healing capabilities.
研究领域:
材料科学
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2020
·
IF 0
Songjia Han,Chunrui Liu,Xiaoyun Lin,Jiwen Zheng,Jin Wu,Chuan Liu
Self-healing hydrogel plays an important role in flexible sensors. However, the development of high-performance hydrogel-based strain sensors with both high sensitivity and large sensing range remains a key challenge. Herein, we prepare a dual conductive network (DCN) hydrogel based on carbon nanotube (CNT) film and conductive hydrogel that exhibits high-conductivity, self-healing, anti-freezing, and non-drying features. The tolerance of this hydrogel to extreme temperatures is improved via a simple solvent replacement, enabling the DCN hydrogel to maintain high flexibility and stretchability under arduous conditions such as temperatures ranging from −85 to 50 °C. Additionally, owing to the dual conductive percolation network structure, the strain sensor based on DCN hydrogel exhibits a gauge factor as high as 343 at a strain of 110%, indicating high sensitivity. The mechanical and electrical performances of the hydrogel would be efficiently self-repaired after a simple heating–cooling treatment. The self-healing sensor can be mounted on the human body to detect biosignals in real time. Our work shows a method of fabricating high-performance self-healing hydrogel for future flexible electronics.
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
DOI
Nano Energy
·
2019
·
IF 15.548
Xueying Zheng,Wenjuan Yang,Zhongqiang Wang,Liqiang Huang,Sheng Geng,Jiayun Wen,Wei Luo,Yunhui Huang
The high theoretical capacity and earth-abundancy of metallic sodium (Na) endow it with high potential as the ultimate anode for batteries based on Na-ion chemistry. Nevertheless, dendritic Na, the unstable solid electrolyte interphase (SEI) and an infinite volume change of Na metal, drive rapid cell deterioration and potential safety hazards. In tackling these challenges, we take advantage of the spontaneous reaction between molten Na and SnO 2 that triggers the formation of a percolated Na–Sn alloy/Na 2 O framework throughout Na metal, effectively anchoring the “hostless” Na into a dual ion/electron-conductive matrix and simultaneously improving the electrode surface chemistry. By density functional theory (DFT) calculations, we validate the high “sodiophilicity” and low Na + diffusion barrier enabled by the Na–Sn alloy/Na 2 O framework. As such, stable Na plating/striping is realized in symmetric cells using both carbonate and ether-based electrolytes without any additive. The full cell paired with Na 3 V 2 (PO 4 ) 3 cathode further demonstrates superior capacity retention of 83% over 300 cycles (1C), along with a promising rate performance at 10C.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Advanced Sustainable Systems
·
2023
·Vol. 9
·期 7
·2300233
·
IF 7.1
Sijie Yu,Yuwei Chen,Yangyang Huang,Huabin Sun,Yu Xie,Sihao Du,Wei Luo
NASICON (NAtrium Super Ionic CONductor)-structured Na 4 MnCr(PO 4 ) 3 has attracted attention as a promising cathode for sodium-ion batteries due to its high operating voltage and specific capacity contributed by multielectron reactions. Unfortunately, its intrinsic low electronic conductivity significantly hinders the release of specific capacity and rate capability, preventing its practical application. Herein, a carbon layer with dual conductive networks connected by chain-like Ketjen black (KB) is built on the surface of Na 4 MnCr(PO 4 ) 3 material. This novel Na 4 MnCr(PO 4 ) 3 /C@KB composite material exhibits improved rate capability of 61.2 mAh g −1 at 2 C compared to 19.5 mAh g −1 of Na 4 MnCr(PO 4 ) 3 /C and high reversible capacity of 88.0 mAh g −1 at 1 C with 73% capacity retention after 100 cycles. The enhanced electrochemical performance can be ascribed to an increase of electronic conductivity enabled by the dual conductive 3D network construction and an adequate infiltration of electrolyte by substantial pores existence in carbon layer. A promising dual conductive network design strategy is demonstrated here for improving the performance of NASICON-structured cathodes.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
·
固态离子学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yiqi Wei,Yinglin Yan,Yiming Zou,Mangmang Shi,Qijiu Deng,Nana Zhao,Juan Wang,Caiyin You,Rong Yang,Yunhua Xu
The sulfonic acid group exhibits considerable ion affinity. The present work therefore synthesizes, a core-shell composite material having a sulfonated polyaniline shell, and a bamboo-derived porous carbon core loaded with sulfur. The thin, homogeneous shell has a thickness of approximately 20 nm. This composite is employed as a cathode material in Li-S batteries and the electrochemical properties of these devices are systematically investigated. This cathode (containing 64.0 wt% S) exhibits a higher initial discharge capacity (1484 mAh g −1 at 0.1 C), improved cycling stability (853 mAh g −1 after 100 cycles at 0.1 C), and remarkable rate performance (810.2, 682.7 and 353.0 mAh g −1 at 2, 3 and 5 C, respectively). These values are superior to those obtained using a polyaniline shell. Electrochemical impedance spectroscopy and density functional theory calculations are used to elucidate the internal mechanisms of the sulfonated polyaniline shell during cycling. The calculated results demonstrate that the shell possesses extremely high electron and Li ion conductivities, and so enhances the redox reaction kinetics during long-term cycling. It also physically confines and chemically anchors polysulfides , thus limiting the shuttle effect. This cathode design is expected to assist in the future commercialization of Li-S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
功能高分子
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 59
·期 2
·563-576
·
IF 4.5
Cao Shuangquan,Chen Jisi,Yang Quanling,Xiong Chuanxi,Fan Rong,Shi Zhuqun
Lithium-sulfur (Li–S) batteries have received great attention due to their high theoretical specific capacity and energy density, wide range of sulfur sources, and environmental compatibility. However, the development of Li–S batteries is limited by a series of problems such as the non-conductivity and volume expansion of the sulfur cathode and the shuttle of lithium polysulfide. It is frequently feasible to alleviate these difficulties by blending carbon-based conductive additives with the cathode material, utilizing a nanostructured cathode, or enhancing the cathode's flexibility. Here, an ion/electron dual-conductive three-dimensional (3D) network structure has been constructed using TEMPO-oxidized cellulose nanofibrils (OCNF) and modified carbon nanotubes. We improved the ionic/electronic conductivity of the cathode materials by adding NCNT or SCNT, and also boosted its electrochemical performance through effective inhibition of polysulfide shuttling by amino or sulfonic acid groups that adsorb the polysulfide. The results showed that the 40-CNFSC@S composite cathode with the introduction of sulfonated carbon nanotubes (SCNT) contained up to 73.9 wt% of sulfur and exhibited the best electrochemical performance, with an initial specific capacity of 1052 mAh g −1 at 0.5 C, and the specific capacity was still as high as 837 mAh g −1 after 120 cycles. Its great cycling stability allows for environmentally friendly and low-cost cellulose-based materials to be utilized in Li–S batteries.
研究领域:
储能
·
材料科学
·
纳米技术
·
电化学
✓ 已验证
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 22
·7930
·
IF 3.748
Ze-Kun Zhang,Shi-Peng Ding,Ze Ye,Ding-Li Xia,Jun-Ting Xu
In this work, the advanced all solid-state block copolymer electrolytes (SBCPEs) for lithium-ion batteries with double conductive phases, poly(ethylene oxide)-b-poly(trimethyl-N-((2-(dimethylamino)ethyl methacrylate)-7-propyl)-ammonium bis(trifluoromethanesulfonyl) imide) (PEO-b-PDM-dTFSI)/LiTFSI, were fabricated, in which the charged PDM-dTFSI block contained double quaternary ammonium cations and the PEO block was doped with LiTFSI. The disordered (DIS) and ordered lamellae (LAM) phase structures were achieved by adjusting the composition of the block copolymer and the doping ratior. In addition, the presence of the hard PDM-dTFSI block and the formation of the LAM phase structure resulted in a good mechanical strength of the solid PEO-b-PDM-dTFSI/LiTFSI electrolyte, and it could maintain a high level of 104Pa at 100 °C, which was around 10,000 times stronger than that of the PEO/LiTFSI electrolyte. Based on the good mechanical and electrochemical properties, the PEO-b-PDM-dTFSI/LiTFSI SBCPE exhibited excellent long-term galvanostatic cycle performance, indicating the strong ability to suppress lithium dendrites.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）