LANGMUIR
·
2023
·
IF 3.9
Suwanda Arachchige Don Rumesh Madhusanka,Jiaxing Qi,Nan Chen,Boyu Wang,Guobao Xu,Decheng Li,Hongyu Wang
A straightforward hybrid approach of a blend cathode is put forward to alleviate self-discharged anion-graphite intercalation compounds in dual-ion batteries. The self-discharge mechanism of the LiNi0.5Mn1.5O4/graphite blend cathode is investigated by conventional electrochemical tests and in situ X-ray diffraction measurements. A charging behavior between electrode materials during self-discharge has been discovered. This work will contribute to advancing the practical implementation of dual-ion batteries and provide valuable theoretical support for the research of blend electrodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuang Chen,Jincheng Huang,Hui Wang,Xuming Liu,Guanghui Gao,Xin Liu,Qin Zhang
Hydrogel-based zinc ion hybrid supercapacitors (ZHSCs) with high flexibility and appealing energy/power densities have attracted increasing attention in energy storage fields. However, the Zn dendrite growth, water-related side reactions, and fast self-charge issues lead to severe performance degeneration of hydrogel-based ZHSCs. Herein, a zwitterion L-carnitine (CN) was integrated into hydrogel electrolyte to construct a dendrite-free and anti-corrosive hydrogel-based ZHSC with a slow self-discharge rate. CN can enter the Zn 2+ inner solvation sheath and isolate active water molecules from Zn anodes to induce homogeneous Zn 2+ deposition and inhibit undesired side reactions. The CN ionic complexes serving as ion transport channels enable the Zn 2+ to move along the migration channels, endowing the hydrogel electrolytes with a high Zn 2+ transference number of 0.847. Besides, CN with zwitterionic groups forms electrostatic interactions with cations and anions, which prevents the diffusion of moveable ions from the electrode surfaces to hydrogel electrolytes, thus effectively prolonging the self-discharge time of ZHSCs. Accordingly, the hydrogel-based ZHSCs exhibit dendrite-free and corrosive-free behaviors on Zn electrodes after long-time operation, presenting a capacitance retention of 75 % after 2000 charge and discharge cycles at 1 A/g. The hydrogel-based ZHSC also display a long self-discharge time of 3h, which is more than 9 times that of the one without CN. This work provides guidance on the design of dendrite-free and anti-self-discharge hydrogel-based zinc ion energy storage devices.
研究领域:
能量存储
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 8
·1908
·
IF 3.623
Yuting Du,Yan Mo,Yong Chen
Activated carbon is widely used as an electrode material in supercapacitors due to its superior electrochemical stability, excellent electrical conductivity, and environmental friendliness. In this study, the self-discharge mechanisms of activated carbon electrodes loaded with different contents of Fe impurities (Fe and Fe3O4) were analyzed by multi-stage fitting to explore the tunability of self-discharge. It is was found that a small quantity of Fe impurities on carbon materials improves the self-discharge performance dominated by redox reaction, by adjusting the surface state and pore structure of carbon materials. As the content of Fe impurities increases, the voltage loss of activated carbon with the Fe impurity concentrations of 1.12 wt.% (AF-1.12) decreases by 37.9% of the original, which is attributable to the reduce of ohmic leakage and diffusion, and the increase in Faradic redox at the electrode/electrolyte interface. In summary, self-discharge performance of carbon-based supercapacitors can be adjusted via the surface state and pour structure, which provides insights for the future design of energy storage.Keywords:supercapacitors;self-discharge;carbon;redox reactions
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Siqi Jing,Xiaohui Yan,Yige Xiong,Taibai Li,Junkai Xiong,Tao Hu,Zhongjie Wang,Liang Lou,Xiang Ge
Supercapacitor is an efficient energy storage device, yet its wider application is still limited by self-discharge. Currently, various composite materials have been reported to have improved inhibition on self-discharge, while the evaluation of the synergistic effect in composite materials is challenging. Herein, pairs of intercalation type pseudocapacitive niobium oxides are pre-lithiated and coupled to construct conjugatedly configured supercapacitors, within which the cathode and anode experience identical reaction environment with single type of charge carrier, thus providing ideal platform to quantify the synergistic effect of composite materials on the self-discharge process. By using titanium dioxide as the stabilizer, we have compared how the modes of forming composite would influence the self-discharge performance of the active composite materials with similar ratio of the constituent materials. Specifically, core@shell Nb 2 O 5 @TiO 2 composite using TiO 2 as the shell shows significantly higher synergy coefficient ( µ = 0.61, defined as the value that evaluates the synergistic effect between composite materials, and can be quantified using the overall performance of the composite, performance of individual component as well as the ratio of the component.) than other control group samples, which corresponds to the highest retained energy of 63% at 100 h. This work is expected to provide a general method for quantifying the synergistic effect and guide the design of composite materials with specific mode of forming the composite.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2022
·Vol. 12
·期 40
·2201800
·
IF 29.698
Jie Chen,Zexiao Cheng,Yaqi Liao,Lixia Yuan,Zhen Li,Yunhui Huang
Li metal batteries have suffered from dendrite growth and its derived dead Li formation for a long time. A new lithium restoration method through the shuttling of redox mediators has been proposed recently. However, the side reaction of severe self-discharge often occurs when some redox mediators are used. Here, a selection principle of redox mediators for reactivating dead Li in lithium metal batteries is put forward, which is able to reactivate the dead Li effectively and reduce the self-discharge at the same time. Three redox mediators of ferrocene (Fc), 10-methylphenothiazine (MPT), and thianthrene (Th) with different redox potentials are tested in LiFePO 4 |Cu anode-free Li metal batteries to clarify the selection principle. Furthermore, 2,2,6,6-tetramethylpiperidinooxy (TEMPO), which is speculated to be a suitable one for reactivating dead Li in lithium metal batteries, is verified. This work provides a universal selection principle of redox mediators and may boost its practical application in Li metal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2023
·Vol. 36
·期 1
·103-112
·
IF 1
Mo Guang-shuai,Ge Kang-kang,Liu Guang-ming
Specific energy and self-discharge are two important performances of electrochemical capacitors. In this work, we have fabricated the composite electrodes by complexing the negatively charged carboxylated multi-walled carbon nanotubes (cMWCNT) with the redox active units-containing positively charged random copolymers. 2,2,6,6-Tetramethylpiperidinyl- N -oxyl and viologen are employed as model redox active units to exemplify the strategy of the concurrent increase of specific energy and suppression of self-discharge of a two-electrode device. The slower hydrogen and oxygen evolution reactions compared with the reactions of the redox active units lead to an increased electrolyte decomposition window, thereby giving rise to an increase in specific energy. On the other hand, the complexation between the cMWCNT and the copolymers suppresses both the redox shuttling and the cross-diffusion of the redox active units-containing polymer chains, leading to an improved performance of self-discharge. Based on the complexation between carbon nanotubes and redox active units-containing charged copolymers, this work provides a convenient and universal strategy to concurrently increase specific energy and suppress self-discharge of electrochemical capacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xuerui Yang,Jianhui Li,Lidan Xing,Youhao Liao,Mengqing Xu,Qiming Huang,Weishan Li
A simple boron-containing molecule, tripropyl borate (TPB), is used as an electrolyte additive to stabilize the interface between spinel lithium manganese oxide (LiMn 2 O 4 ) and carbonate-based electrolyte under elevated temperature. Electrochemical measurements indicate that the cyclic stability of LiMn 2 O 4 electrode can be significantly improved by TPB. The capacity retention of LiMn 2 O 4 at 1C after 200 cycles under 55 °C is improved from 47% to 74% by adding 3% TPB into a standard electrolyte (1.0 mol L −1 LiPF 6 -EC/EMC/DEC (3/5/2, in weight)). Most importantly, the self-discharge of LiMn 2 O 4 under 55 °C, which takes place dramatically in the standard electrolyte, is effectively suppressed in 3% TPB-containing electrolyte. Theoretical calculations and physical characterizations demonstrate that a protective cathode electrolyte interface (CEI) film is formed on LiMn 2 O 4 from the preferential oxidation of TPB, which suppresses the oxidation decomposition of the standard electrolyte. Due to the incorporation of boron, the CEI film formed from TPB is beneficial to the rate capability of LiMn 2 O 4 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 14
·8633-8640
·
IF 10.733
Zixing Wang,Xiang Chu,Zhong Xu,Hai Su,Cheng Yan,Fangyan Liu,Bingni Gu,Haichao Huang,Da Xiong,Hepeng Zhang,Weili Deng,Haitao Zhang,Weiqing Yang
Apart from low energy density, the rapid self-discharge phenomenon also severely limits the application of supercapacitors in periodic energy storage and power supply. Herein, we proposed a novel ‘playing mud pies’ strategy to prepare the high-performance bentonite clay@ionic liquid based solid-state electrolyte (BISE), which can efficiently solve the self-discharge issue of supercapacitors. The BISE-based supercapacitors display an extremely low self-discharge behavior with an open circuit potential drop of only 28.9% within 60 h, much better than that of conventional supercapacitors (40.1%@12 h). More importantly, even at a high temperature of 75 °C, the supercapacitors can still present a low voltage decline of 40% within 12 h and can stably deliver a high voltage of >1.5 V, which guarantees high-temperature energy conversion and storage application. We further proved that the low self-discharge mechanism originates from the confinement effect of silicon–oxygen bonds of the clay, which suppress the shuttle effect of Fe ions and promote selective penetration of electrolyte anions. Consequently, the remarkable decrease of both the ohmic leakage and diffusion-controlled faradaic process could sharply weaken the self-discharge behavior. Based on the BISE, we also developed soft-packaged supercapacitors with a low self-discharge value of 23.6%@20 h. Evidently, our ‘playing mud pies’ method can open a route to exploit extremely low self-discharge supercapacitors at widely ranging temperatures for deep insight into the self-discharge mechanism and further for efficient energy storage of supercapacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Haonan Zhang,Lin Fang,Yuanchao Guo,Zhongzhu Wang,Haibo Hu,Wen He,Peihong Wang
Supercapacitors (SCs) have attracted extensive attention due to the properties of high power density, long cycle life, and high rate performance. However, the high self-discharge is one giant challenge for long-term energy storage applications of SC. Herein, we prepared a high-performance SC with low self-discharge based on nitrogen-sulfur co-doped ZIF-8-derived (NS-PC) materials. The synergistic effects of high-temperature carbonization and nitrogen-sulfur (N-S) doping are systematically investigated. With a carbonization temperature of 900 °C, assisted with N-S doping, the maximum specific capacitance of the NS-PC-900//NS-PC-900 symmetrical SC is 42.7 F g −1 , while the power densities range from 650 to 13,000 W kg −1 at the energy densities of 10.04–7.5 Wh kg −1 . The specific capacitance remains 95.7 % even after 20,000 charge-discharge cycles. More importantly, the as-prepared NS-PC-900//NS-PC-900 SC exhibits an ultra-low self-discharge rate of solely 0.025 V h −1 within 24 h. This work provides a universal strategy to fabricate high-performance SCs with low self-discharge.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jinxiu Gu,Xiaopeng Li,Shaofei Shi,Juanjuan Wang,Xue Han,Conghua Lu
Iodide-based redox supercapacitors (SCs) can increase the specific capacitance of conventional SCs by introducing redox species in the electrolyte. However, the rapid shuttling effect of I - /I 3 - would exacerbate the self-discharge behavior of the redox SCs. Herein, we developed a novel composite electrolyte solution consisting of 0.1 M potassium iodide (KI) and highly concentrated salt (e.g., 9 M potassium acetate (KAc)), which is used for the assembly of iodide-based redox SCs. The composite electrolyte solution not only extends the operating voltage of the aqueous redox SCs to 2.0 V, but also leads to a low self-discharge rate. Specifically, at 1.6 V, the self-discharge rate of the 9 M KAc-based SCs decreases from 62.58 to 19.58 mV/h, compared to the 1 M KAc-based SCs. Meanwhile, the suppressed shuttling effect of I - /I 3 - by highly concentrated salt solution is well studied by in-situ UV–vis absorption spectrum, viscosity, conductivity, Raman spectroscopy, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. It is concluded that highly concentrated electrolyte can limit the diffusion of active species and thus transform the self-discharge mechanism from an activation-controlled faradaic reaction to a diffusion-controlled faradaic reaction. This work not only deepens understanding the working mechanism of highly concentrated composite electrolyte for alleviating the self-discharge of redox SCs, but also opens a new universal avenue to fabricate good cycling stability and high performances of redox SCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Dezhu Zhang,Su Fan,Kenan Xu,Haotian Liu,Nana Chang,Yijie Wang,Yixing Wang,Kang Huang,Zhi Xu
Vanadium flow battery (VFB) shows great potential in balancing the volatility of renewable energy. In this work, we investigated, for the first time, the various properties of crystalline ZSM-5 membranes prepared through the organic template-free gel strategy in VFB. The subnano windows (∼0.55 nm) of ZSM-5 zeolite provided selective transport paths for protons (∼0.27 nm) and blocked the vanadium (>0.6 nm) migration through pore repulsion effect. The zeolite membranes exhibited a very low vanadium penetration rate (0.05 mmol L–1 h–1), achieving a Coulombic efficiency (CE) of 96.1%, a voltage efficiency of 78.3%, and an energy efficiency of 75.3% at the current density of 40 mA cm–2. Notably, ZSM-5 prepared using the template-free strategy eliminates the need for a high-temperature calcination step, and the membrane has a lower defect density and exhibits a higher CE. The self-discharge time of the ZSM-5 zeolite membrane increased up to 78 h. Furthermore, the charge–discharge performance kept stable more than 300 cycles at 60 mA cm–2.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2025
·
IF 17.1
Huanchi Chen,Yuxuan Zhang,Gang Zhao,Bingzhe Jia,Xinming Wu
Transition metal sulfides exhibit excellent energy density and specific capacitance in redox enhanced supercapacitors. However, the phenomenon of rapid self-discharge limits their large-scale development. In this study, we have analyzed an innovative and simple preparation of polydopamine (PDA) coated CoS 2 @MoS 2 @CC for redox enhanced supercapacitors applications. Considering the suppression the self-discharge of supercapacitors while also improving electrochemical performance of electrode. Subsequently, the densities of states, differential charges and adsorption energies of the PDA@CoS 2 @MoS 2 @CC and CoS 2 @MoS 2 @CC electrodes were calculated by using density functional theory (DFT) to investigate the mechanism of the effect of polydopamine on the performance of supercapacitors. PDA@CoS 2 @MoS 2 @CC electrode reveals a large specific capacitance (3520.45 mF cm −2 ) and outstanding cycling stability (92.75 % capacity maintenance after 10,000 cycles at 1 mA cm −2 ). This is because of the strong interaction between the PDA coating and K + , while K + are adsorbed in the PDA@CoS 2 @MoS 2 @CC electrode with high adsorption energy (-2.59 eV). It is convenient for the storage of K + . Therefore supercapacitors assembled with PDA@CoS 2 @MoS 2 @CC electrode also exhibit excellent performance (specific capacitance, energy density and power density are 511.85 mF cm −2 , 0.74 Wh cm −2 and 1.53 W cm −2 at 0.5 mA cm −2 ). It is important to investigate the self-discharge performance of the supercapacitor constructed by PDA@CoS 2 @MoS 2 @CC. Notably, the voltage of this device decreases to 0.73 V after 20000 s (initial potential is 1.7 V), which is better than the device assembled by CoS 2 @MoS 2 @CC (0.6 V after 20000 s). Further, the leakage current of this device is also less than the device assembled by CoS 2 @MoS 2 @CC at 1.7 V (0.05 mA vs 0.08 mA). This effective self-discharge suppression strategy is due to the free radical/singlet oxygen scavenging properties of PDA, which limits the parasitic Faraday reaction induced by diffusion-controlled, thus mitigating self-discharge.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 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）