Energy Storage Materials
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2022
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IF 20.831
Rui Wang,Huasong Xu,Sang Cheng,Jiajie Liang,Bin Gou,Jiangang Zhou,Jing Fu,Congzhen Xie,Jinliang He,Qi Li
Polymer dielectrics have been widely used for capacitive energy storage. However, the volumetric energy density of polymer dielectrics is generally low, which falls short of the need for high-power and compact-size electronic devices and electrical systems . Here, a scalable all-organic composite based on a ferroelectric polymer incorporated with an abundant, cost-effective organic molecule, i.e. , glucose is reported, exhibiting record dischargeable energy density (37.7 J/cm 3 ) that outperforms the state-of-the-art dielectric polymer composites . The glucose molecules rich in hydroxyl groups are found to facilitate the formation of a physically cross-linking network of hydrogen bonds within the polymer matrix , which is responsible for the remarkable performance improvement. Both simulation and experimental results show that the hydrogen bonds serve as the trapping sites of charge carriers and suppress conduction loss . The hydrogen bond network is also found to account for the increased crystallinity , reduced crystallite size , and stabilized γ phase in the polymer, which leads to enhanced electric displacement and reduced hysteresis loss . In combining the advantages of extraordinary energy storage performance, abundant raw materials, ease of preparation, this approach is viable for large-scale production of polymer-based high-energy-density dielectric materials.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
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2020
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IF 16.28
Zhuo Chen,Zhonghui Shen,Yang Liu,Yang Zhang,Shengliao Yan,Rui Feng,Tingting Zhao,Guanghui Zhao,Chuanxi Xiong,Lijie Dong
Flexible dielectric materials with ultrahigh energy density ( U e ) is of critical importance to reduce the size of dielectric capacitors, which has recently drawn ever-increasing attention. Herein, different from the incorporation of traditional 1D/2D inorganic nanofiller into single/multi-layer polymer matrix , a multifunctional poly ( p -phenylene terephthalamide) (PPTA)-based derivative fluxible polymer ( f -PPTA) nanocluster is selected and introduced to typical ferroelectric poly (vinylidene fluoride) (PVDF) matrix. As a novel polymer-based nanofiller, the f -PPTA nanocluster consists of self-bundled parallel sulfonated PPTA skeleton and grafted with octadecylamine polyoxyethylene ether amphiphilic (PEGO) amine ligand through ionic interaction. In the multi-arm amphiphilic PEGO, one alkyl chain with the length of 15 carbon atoms provides similar hydrophobic nature to that of PVDF, which contributes to improving the interfacial compatibility between polymer nanocluster and matrix. Furthermore, the relatively short hydrophilic chain with the length of 8 carbon atoms induces a specific necklace-like arrangement of the f -PPTA nanoclusters in PVDF matrix during film fabrication spontaneously. Consequently , an ultrahigh U e ~ 22.5 J•cm −3 of the dielectric film is acquired at 600 MV•m −1 electric field. This value is the highest reported so far among all the poly (vinylidene fluoride) (PVDF)-based dielectric nanocomposites to the best of our knowledge. In addition, the elongation at break of the film can be increased to 390%, which is over 9 times that of pure PVDF sample. This work provides a new route to PVDF-based polymer nanocomposites with ultrahigh U e and highly stretchable performance.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Dong Yang,Junyuan Tian,Shuo Tian,Fang Yu,Kailiang Ren
BNT-6BT-based lead-free ceramics have gained significant attention due to their relatively large piezoelectric coefficients and tunable morphotropic phase boundary conditions. In this investigation, SrTiO 3 (ST) was added to BNT-6BT ceramics to fabricate the BNT-6BT- x ST (BNBT- x ST) composition. The impact of ST content on the phase structure and dielectric permittivity of the BNBT- x ST ceramics was studied. The XRD refinement data show that with increasing ST content, the crystal structure of BNBT- x ST ceramics was transformed from the morphotropic phase structure (coexisting tetragonal (P4/mmm) and pseudo-cubic (Pmm) phase) to the pseudo-cubic phase. The dielectric permittivity data of the BNBT-80ST showed that the T m (the maximum permittivity temperature) moved to −61.9 °C, which caused the room temperature to fall within the range of T m < T < T B (the Burns temperature). This makes the BNBT-80ST a superparaelectric state in relaxor ferroelectrics (RFE). Furthermore, the maximum energy density and the charge-discharge efficiency of the BNBT-80ST achieved 5.48 J/cm 3 and 87% at 495 kV/cm, respectively. The energy density of the BNBT-80ST was improved by 2.97-fold and 49% compared with that of the BNBT-30ST and BNBT-70ST. This is mostly attributed to weakened ferroelectricity and improved paraelectricity in the BNBT-80ST. This investigation demonstrates that BNBT- x ST ceramics can be adjusted to a superparaelectric state with an ST content of 80%. This makes the material to possess both a large polarization and a high breakdown field. This material holds great promise for high energy density capacitor applications.
研究领域:
材料科学
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陶瓷
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铁电材料
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能量存储
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2023
·Vol. 34
·期 2
·2305470
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IF 19
Hangyu Lu,Shiyong Chu,Jiaming Tian,Qi Wang,Chuanchao Sheng,Chen Cheng,Rixin Liu,Anita M. D'Angelo,Wei Kong Pang,Liang Zhang,Haoshen Zhou,Shaohua Guo
Lattice-oxygen redox in layered metal oxide cathodes offers a promising way to exploit high-energy density sodium-ion batteries. However, oxidation and reduction of lattice-oxygen are always asymmetric, showing poor reversibility upon charging and discharging due to the activated oxygen loss and subsequent structural rearrangement. Here, a layered Na 0.7 [Li 0.2 Mn 0.7 Co 0.1 ]O 2 (NLMCO) is developed by balancing lattice-oxygen activity and reversibility, which can deliver a record energy density of 729.7 Wh kg −1 , further exceeding the state-of-the-art Na 0.75 [Li 0.25 Mn 0.75 ]O 2 (NLMO, 638.4 Wh kg −1 ). In light of electron paramagnetic resonance spectroscopy, in situ differential electrochemical mass spectroscopy, and electrochemical testing results, the highly activated lattice-oxygen is effectively stabilized in NLMCO without oxygen molecule release while obvious oxygen release is detected in the highly activated NLMO. Benefiting from the enhanced transition metal-oxygen covalency and reduced band energy gap, the NLMCO electrode demonstrates simultaneously high lattice-oxygen activity and reversibility, thus resulting in excellent rate and cycling performance, as well as ultra-high energy density. The findings highlight the critical association of energy density and lattice-oxygen redox reversibility, which will inspire more interest in anionic redox-based high-energy batteries.
研究领域:
材料科学
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电池技术
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2025
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IF 4.9
Chunyu Wu,Zhiqiang Wei,Meijie Ding,Meipan Zhou,Yanxia He,Ke Huang,Qingpan Liu,Jinglong Bai
Transition metal phosphides are regarded as ideal electrode materials for high energy density supercapacitors due to their high theoretical specific capacitance and multi-electron redox properties, but they still face challenges such as low utilization of active sites, high resistance to ion diffusion, and structural collapse during cycling. In this study, we propose a three-dimensional nickel-cobalt phosphide nanosheet array design strategy based on ammonium fluoride (NH 4 F) modulation, and vertically aligned three-dimensional porous nickel-cobalt-phosphide nanosheet arrays (F5–NiCoP/NF) were constructed in-situ on nickel foam substrates by a template-free hydrothermal-phosphorization two-step method. Its superior electrochemical performance stems from bimetallic synergy and the high conductivity of the phosphide. Vertical nanosheet arrays build a three-dimensional conductive network to reduce ion diffusion resistance, and abundant pores significantly accelerate charge transport and expose abundant electroactive sites. Notably, this approach simultaneously simplifies the preparation process and reduces the cost. Benefitted from these merits, the F5–NiCoP/NF electrode achieves a high specific capacitance of 3244 F g −1 at a current density of 1 A g −1 , a capacity retention of 75.69 % at a high multiplicity of 10 A g −1 , and retains 81.44 % of its initial capacity after 10,000 cycles. The assembled asymmetric supercapacitor F5–NiCoP/NF//AC exhibits an energy density of 48.37 Wh kg −1 and a power density of 800.04 W kg −1 .
研究领域:
材料科学
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电化学
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纳米技术
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储能
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表面工程
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产品关联
DOI
高影响因子
ACS Nano
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2022
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IF 18.027
Yingyi Ding,Tianli Han,Zhao Wu,Yong Guan,Jun Hu,Chaoquan Hu,Yangchao Tian,Jinyun Liu
Magnesium/lithium hybrid-ion batteries (MLHBs) combine the advantages of high safety and fast ionic kinetics, which enable them to be promising emerging energy-storage systems. Here, a high-performance MLHB using a modified all-phenyl complex with a lithium bis(trifluoromethanesulfonyl)imide electrolyte and a NiCo2S4 cathode on a copper current collector is developed. A reversible conversion involving a copper collector with NiCo2S4 efficiently avoids the electrolyte dissociation and diffusion difficulties of Mg2+ ions, enabling low polarization and fast redox, which is verified by X-ray absorption near edge structure analysis. Such combination affords the best MLHB among all those ever reported, with a reversible capacity of 204.7 mAh g–1 after 2600 cycles at 2.0 A g–1, and delivers an ultrahigh full electrode-basis energy density of 708 Wh kg–1. The developed MLHB also achieves good rate performance and temperature tolerance at −10 and 50 °C with a low electrolyte consumption. The hybrid-ion battery system presented here could inspire a broad set of engineering potentials for high-safety battery technologies and beyond.
研究领域:
储能
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电池技术
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电化学
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材料科学
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可持续能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）