MATERIALS LETTERS
·
2014
·
IF 2.269
Yaguang Yuan,Yanping Yuan,Nan Zhang,Yanxia Du,Xiaoling Cao
Capric–myristic–palmitic acid ternary eutectic mixture (CA–MA–PA) was prepared as phase change material (PCM). A novel composite PCM of CA–MA–PA/expanded graphite (EG) with an optimum mass ratio (CA–MA–PA:EG=13:1) was prepared by uniformly absorbing CA–MA–PA into the porous network structure of the EG. The melting and freezing temperatures of CA–MA–PA/EG composite PCM were measured by differential scanning calorimeter as 18.61 °C and 16.58 °C, respectively, while the melting and freezing latent heats were 128.2 J/g and 124.5 J/g, respectively. The thermal conductivity of the CA–MA–PA/EG composite PCM was measured as 3.67 W/m K and thus the thermal storage and release rates were significantly increased. The thermal cycling test results showed that CA–MA–PA/EG composite PCM has a good thermal reliability. All the above results show that the CA–MA–PA/EG composite PCM is a potential solution for latent heat storage system.
研究领域:
材料科学
·
能源化学
·
热物理
·
功能材料
·
储能技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Liming Jin,Jie Ni,Chao Shen,Fenglai Peng,Qiang Wu,Donghao Ye,Junsheng Zheng,Gaoran Li,Cunman Zhang,Zhoupeng Li,Jim P. Zheng
A metallically conductive TiB 2 is developed to construct multifunctional separator toward improved lithium-sulfur (Li–S) battery performance. Coupled with two-dimensional graphene, the obtained TiB 2 @G separator fulfills a synergistic combination of strong physical and chemical sulfur immobilization as well as a high-efficiency sulfur reutilization, thus establishing a robust barrier against the polysulfide shuttling and enabling a fast and durable sulfur electrochemistry . As a result, cells based on TiB 2 @G separator exhibit a high sulfur utilization with 1350 mA h g −1 capacity at 0.05C, superb rate capability up to 5.0C, and excellent cyclability with a high capacity retention over 85% after 300 cycles at 0.5C. Moreover, significantly mitigated self-discharge and considerably high areal capacity of 5.8 mA h cm −2 can be also achieved, indicating the great promise of this separator design for the development of high-performance Li–S batteries.
研究领域:
电化学
·
能源材料
·
纳米材料科学
·
储能技术
·
电池化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Heli Yu,Mingzhu Bi,Cuijuan Zhang,Tianjie Zhang,Xiaoning Zhang,Hongtao Liu,Jianli Mi,Xiangqian Shen,Shanshan Yao
Construction of high sulfur loading electrode is one of the effective ways to achieve high specific energy density lithium/sulfur batteries. Therefore, the optimization of polymeric binders has been considered as effective strategy to improve the volume changes of sulfur electrodes during charge/discharge processes. In this work, an effective route for the preparation of three dimensional polymeric binder (PAA-PANI) via multiple hydrogen bonds was developed and fabricated through in situ polymerization between polyacrylic acid (PAA) and polyaniline (PANI), which possess bifunctional effects on high sulfur loading cathodes in lithium/sulfur batteries. The carboxyl polar groups of PAA could effectively adsorb polysulfides and the conductive PANI enhance the electronic conductivity of the sulfur electrode. The three dimensional polymeric binder of PAA-PANI has enhanced the active material adhesion, mechanical properties and electronic conductivity, which decreased overpotential polarization, improved the lithium ions diffusion coefficient, and reduced the self-discharge. More importantly, the PAA-PANI functional binder could alleviate the expansion of high sulfur loading electrode. Taking advantages of PAA-PANI binder, the carbon nanotubes modified sulfur electrode (CNTs@S; sulfur content: 84.3 wt%) with PAA-PANI binder exhibits an initial discharge capacity of 906 mAh g –1 at 2.56 mA cm –2 (0.3 C) under a sulfur loading of 5.1 mg cm –2 . Even at higher current density of 8.54 mA cm –2 (1 C), the PAA-PANI binder electrode delivers a high capacity of 846 mAh g –1 . Moreover, with an extremely high areal sulfur loading of 17 mg cm –2 , the cathode shows an areal specific capacity of 16.7 mAh cm –2 .
研究领域:
电化学
·
能源材料
·
高能电池
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功能高分子
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界面化学
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储能技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Chengyuan Liu,Zhiwei Liu,Qiming Li,Hongkun Niu,Cong Wang,Zhaowen Wang,Bingliang Gao
Aluminum battery offers a new possibility for low cost and large-scale stationary storage of electricity because it can be made with cheap materials and exhibits high theoretical mass specific capacity and power density. Among many cathodic materials, graphite/graphene may be one of the most promising cathode materials for aluminum-ion battery. A suitable three-dimensional structure of the cathode is an important factor for the high performance of battery. In this paper, a binder-free cathode is prepared by dropcasting small ultrasonicated graphite flakes (u-GF) on carbon fiber cloth (CFC) which provides a three-dimensional network skeleton for the new cathode. Al|EMImCl-1.3AlCl 3 |u-GF@CFC battery exhibits a high discharge specific capacity of ~140 mAh g −1 at 100 mA g −1 . The battery has good rate performance and cycling stability: the capacity still exceeds 100 mAh g −1 at 600 mA g −1 with a high coulomb efficiency of 98% and maintains 60 mAh g −1 at 3000 mA g −1 over 300 cycles.
研究领域:
电化学
·
能源材料
·
纳米材料
·
储能技术
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Jing Gao,Chunshui Sun,Lei Xu,Jian Chen,Chong Wang,Decai Guo,Hao Chen
Due to flexible property and light weight, the lithiated Nafion membrane swollen with PC (PC-Li-Nafion) has been employed as both solid-state electrolyte and separator to fabricate solid-state Li-S cells. The electrochemical measurements of PC-Li-Nafion membrane show that its Li-ion transference number is 0.928, ionic conductivity of 2.1 × 10 −4 S cm −1 can be achieved at 70 °C and its electrochemical window is 0 ∼ +4.1 V vs. Li + /Li. It is observed that the Li dendrites are suppressed by using PC-Li-Nafion membrane due to its single-ion conducting property. The amounts of Li-Nafion resin binder and conductive carbon in the cathode are optimized as 40% and 10% respectively to make a balance of ionic and electronic conductivities . A thin-layer Li-Nafion resin with a thickness of around 2 μm is fabricated between the cathode and PC-Li-Nafion membrane to improve the interfacial contact and further enhance the specific capacity of the cell. When measured at 70 °C, the Li-S cell delivers a reversible specific capacity of 1072.8 mAh g −1 (S) at 0.05 C and 895 mAh g −1 (S) at 1 C. The capacity retention at 1 C is 89% after 100 cycles. These results suggest that high-performance solid-state Li-S cells can be fabricated with the Li-Nafion polymer electrolyte .
研究领域:
电化学
·
能源材料
·
固态电池
·
聚合物电解质
·
锂离子电池
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电极界面工程
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储能技术
✓ 已验证
DOI
高影响因子
Energy & Environmental Materials
·
2020
·Vol. 3
·期 4
·529-534
·
IF 0
Yanyou Yin,Yu Zhang,Nannan Liu,Lishuang Fan,Naiqing Zhang
Transitional metal phosphides (TMPs) anode materials usually have large volume change and weak diffusion kinetics, leading to poor cycle stability. Combining TMPs with conductive carbon matrix has been widely used to boost sodium storage. However, it still needs to make efforts in the rational and facile design of nano/micro-structural TMPs/carbon hybrid anode material. Herein, a MOFs-derived strategy is developed to synthesize porous yolk–shell MoP/Cu 3 P@carbon microcages (MoP/Cu 3 P@C) through in situ and confined phosphidation reaction as a high-performance sodium-ion batteries anode. This yolk–shell structure can offer adequate internal space to buffer the large volume expansion, shorten diffusion distance, and create more active sites of Na + . Especially, the Cu nanoparticles generated from Cu 3 P have remarkable electronic conductivity of 5.7 × 10 7 S m −1 (the second most conductive metal) to benefit transporting electrons. And the introduction of Mo (MoP has high theoretical capacity of 633 mA h g −1 ) can enhance the reversible capacity of the whole anode material. Therefore, these porous yolk–shell MoP/Cu 3 P@carbon microcages possess excellent reversible capacity of 307.8 mA h g −1 at 1.0 A g −1 and extraordinary cycle stability of 132.1 mA h g −1 at 5.0 A g −1 even after 6000 cycles.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
无机功能材料
✓ 已验证
DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zecheng Yang,Liluo Shi,Hao Wang,Jianzhen Xiong,Xuena Xu,Limei Sun,Jiangmin Jiang,Quanchao Zhuang,Yaxin Chen,Zhicheng Ju
Carbon nanosheets (CNS) have garnered significant interest as anode materials for potassium-ion batteries (PIBs) due to the excellent potassium storage kinetics and rate performance. Moreover, tuning the thickness of CNS can enhance the potassium storage performance by exposing abundant surface active sites and shortening the K + migration path. Herein, crystallization-induced thickness tuning of carbon nanosheets in polyvinyl pyrrolidone-potassium chloride (PVP-KCl) solution is reported to enhance the fast potassium storage. PVP with varying molecular weights is employed to induce the crystallization behavior of KCl, leading to the formation of KCl grains with controllable sizes. Concurrently, these KCl grains act as hard templates for dispersing the PVP molecules to fabricate carbon nanosheets on the surface during annealing. PVP with high molecular weight is beneficial for hindering ion migration to reduce crystal sizes, which can decrease the thickness of carbon nanosheets. The ultrathin structure exposes abundant potassium storage sites, endowing CNS with high reversible capacity (359.0 mAh/g at 100 mA/g). The reduction in the migration path of K + ions facilitate rapid ion and electron transport kinetics, resulting in rate performance with a capacity of 181.9 mAh/g at 1 A/g. Our work extends the application of the crystallization-induced strategy for controllable designing carbon nanosheets, and puts forward some conceptions on improving the potassium storage performance of carbon anode materials.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
碳材料
·
电池材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 36
·19536-19545
·
IF 11.9
Gege Wang,Feifan Zhang,Caiyu Ma,Jianhua Yang,Xiaowei Chi,Yu Liu
Aqueous zinc metal batteries (AZMBs) as one of the next-generation energy storage technologies have attracted both academic and industrial attention due to their high safety, low cost, and high specific energy, yet are facing interfacial challenges at the electrolyte/anode interface, e.g. uneven physical diffusion of Zn2+ flux, severe chemical corrosion, and disordered electrochemical deposition behavior of the zinc metal anode. To address these issues, herein, we propose a facile and effective electrolyte modulating strategy to construct a physico-chemo-electrochemically coupled stable interface between the aqueous electrolyte and zinc anode. The aqueous electrolyte modified using a tiny amount of water-soluble ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) can form a positively charged organic EMIM+ adsorption layer and a protective inorganic Zn2+-conducting layer through the in situ decomposition of BF4− on the zinc anode surface, thus effectively homogenizing the Zn2+ diffusion flux and decreasing the chemical corrosion rate. Moreover, EMIM+ provides an electrostatic shielding layer, leading to the preferential and ordered electrodeposition of Zn2+ along the Zn (002). Benefiting from this physico-chemo-electrochemically multifunctional interfacial layer, the Zn//Zn symmetric cells achieve a considerably extended lifespan of up to 1200 h at 5 mA cm−2 and 5 mA h cm−2, and more than 450 h even at an ultrahigh current density and large deposition capacity (10 mA cm−2 and 10 mA h cm−2). Zn//Cu asymmetric cells also exhibit excellent reversibility with a high coulombic efficiency of 99.75%. Furthermore, the physically, chemically, and electrochemically stabilized interface enables the AZMB with a quinone-based cathode to offer high specific capacity (256.9 mA h g−1) and a decent capacity retention rate (83.9% after 300 cycles).
研究领域:
电化学
·
能源材料
·
界面科学
·
储能技术
·
材料化学
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2016
·
IF 3.043
Min-Jie Liu,Li-Wu Fan,Zi-Qin Zhu,Biao Feng,Han-Cong Zhang,Yi Zeng
In order to study quantitatively the inward solidification heat transfer of a phase change material (PCM) enclosed in spherical capsules, an experimental method was proposed in this Technical Note, which is based upon measurement on the instantaneous volume shrinkage of the PCM during solidification. The shrunk volume was compensated continuously by an extra amount of liquid PCM preserved in a tube, and the descending height in the tube was recorded to calculate the volume shrinkage. Other quantities of interest, solidification fraction and surface-averaged heat flux for example, were readily reduced as single-valued functions of the volume shrinkage. Using 1-tetradecanol as the PCM, the proposed method was realized in laboratory with a stainless steel spherical capsule having an inner diameter of approximately 60 mm. Parallel tests were carried out for a set of three boundary cooling temperatures. It was shown that the measured descending heights are reproducible and are in agreement with the theoretical maximum values approaching the end of solidification. The experimental results were then discussed with an emphasis on the transient variations of solidification and heat transfer. Correlations were obtained for both solidification fraction and surface-averaged Nusselt number with respect to the product of Fourier and Stefan numbers.
研究领域:
热科学与工程
·
储能技术
·
传热传质学
·
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 22
·2000870
·
IF 11.459
Kezhong Lv,Pengfei Wang,Chao Wang,Zihan Shen,Zhenda Lu,Huigang Zhang,Mingbo Zheng,Ping He,Haoshen Zhou
Lithium–sulfur batteries, as one of promising next-generation energy storage devices, hold great potential to meet the demands of electric vehicles and grids due to their high specific energy. However, the sluggish kinetics and the inevitable “shuttle effect” severely limit the practical application of this technology. Recently, design of composite cathode with effective catalysts has been reported as an essential way to overcome these issues. In this work, oxygen-deficient ferric oxide (Fe 2 O 3− x ), prepared by lithiothermic reduction, is used as a low-cost and effective cathodic catalyst. By introducing a small amount of Fe 2 O 3− x into the cathode, the battery can deliver a high capacity of 512 mAh g −1 over 500 cycles at 4 C, with a capacity fade rate of 0.049% per cycle. In addition, a self-supporting porous S@KB/Fe 2 O 3− x cathode with a high sulfur loading of 12.73 mg cm −2 is prepared by freeze-drying, which can achieve a high areal capacity of 12.24 mAh cm −2 at 0.05 C. Both the calculative and experimental results demonstrate that the Fe 2 O 3− x has a strong adsorption toward soluble polysulfides and can accelerate their subsequent conversion to insoluble products. As a result, this work provides a low-cost and effective catalyst candidate for the practical application of lithium–sulfur batteries.
研究领域:
电化学
·
能源材料
·
纳米催化
·
储能技术
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED ENERGY
·
2018
·
IF 7.9
H.R. Jiang,W. Shyy,M.C. Wu,R.H. Zhang,T.S. Zhao
In this work, a bi-porous graphite felt electrode is prepared by a simple yet effective catalytic etching method for vanadium redox reflow batteries (VRFBs). The primary pores, ∼100 μm in size and formed by voids between interconnected carbon fibers, act as the macroscopic pathways for electrolyte flow, while the secondary pores, ∼200 nm in size and formed onto carbon fibers, increase the active surfaces for electrochemical reactions. The Brunauer-Emmett-Teller results show that the specific surface area of bi-porous graphite felt is 17.73 m 2 g −1 , which is 7 times larger than that of the original graphite felt. The cyclic voltammetry and electrochemical impedance spectroscopy tests demonstrate the higher peak currents, smaller peak potential separations and lower charge transfer resistances of the bi-porous graphite felt than the original graphite felt. Battery tests show that the VRFB with the bi-porous graphite felt electrode achieves an energy efficiency of 87.02% and an electrolyte utilization of 84.07% at the current density of 200 mA cm −2 , which are 17.90% and 38.91% higher than that with the original graphite felt electrodes. More importantly, the battery can be operated at the high current densities of 300 and 400 mA cm −2 with the energy efficiencies of 82.47% and 77.69%, among the highest performance in the open literature. All these superior results demonstrate that the bi-porous graphite felt prepared in this work offers a promise to replace conventional mono-scale porous graphite felt electrodes for VRFBs.
研究领域:
储能技术
·
电化学
·
材料科学
·
可再生能源技术
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Zhifang Liu,Zhonghua Chen,Fei Yu
High thermal performance of microencapsulated phase change material (MEPCM) helps to achieve good solar energy storage behavior. Here, n-dodecanol/melamine resin composite microcapsules modified by graphene oxide (GO) with different oxidation degrees were synthesized, which was applied to study how the oxidation degree of GO influenced the thermal properties of MEPCM. The as-prepared microcapsules were all spherical particles with the average latent heat of 170 J/g. TEM analysis showed that MEPCMs with or without GO had obvious core-shell structure with uniform shell thickness. When the dosing of GO was about 0.6 wt%, the thermal conductivity of MEPCM/GO with the minimum oxidation degree was enhanced by 115%, while MEPCM/GO with maximum oxidation degree was increased by 72% in thermal conductivity , greatly improving the energy storage efficiency. The result suggested the as-prepared microcapsules with large energy storage capacity and high energy storage efficiency could be a potential material used for solar energy storage.
研究领域:
材料科学
·
储能技术
·
纳米技术
·
热工工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）