ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Ce Qiu,Xiaohui Zhu,Liang Xue,Mingzhu Ni,Yang Zhao,Bo Liu,Hui Xia
Adding Mn 2+ in aqueous electrolyte is a well adopted approach to improve cycle performance for Zn/MnO 2 batteries. The function of Mn 2+ additive in aqueous electrolyte, however, is not well understood, which could affect revealing the real performance of the MnO 2 cathode itself. In this work, a battery system with Zn anode and birnessite MnO 2 cathode is constructed and systematically investigated by using MnSO 4 additive in the electrolyte with different concentrations. The function of Mn 2+ in the electrolyte, the structural evolution of the electrode, the reaction mechanism, and the cause for capacity fading are comprehensively investigated in this system. It is found that Mn 2+ can be continuously electro-oxidized at the cathode and form ε-MnO 2 when the charge voltage is above 1.7 V during cycling, leading to successive capacity increase up to hundreds of cycles. The capacity increase, however, stops after certain cycle numbers, and is followed by fast capacity fading, which is correlated to the competition between ε-MnO 2 formation and phase transition from birnessite to spinel ZnMn 2 O 4 . It is suggested that addition of Mn 2+ in the electrolyte cannot stabilize the MnO 2 cathode and the improved cycle performance is achieved at the expense of consuming the Mn 2+ in the electrolyte.
研究领域:
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2018
·Vol. 7
·期 4
·1800912
·
IF 3.175
Hang Wei,Xiao Hu,Xianfeng Zhang,Zhifeng Yu,Tianyi Zhou,Yang Liu,Yongguang Liu,Yue Wang,Jiexin Xie,Lianfeng Sun,Minghui Liang,Peng Jiang
Rechargeable zinc-based aqueous batteries are a promising candidate for next-generation energy storage devices because of the high theoretical energy density of Zn as well as the availability, safety, and cheap price of Zn-based aqueous batteries. A Zn@C core–shell composite is designed to overcome two problems of Zn anodes, that is, the formation of Zn dendrites and the corrosion/loss of Zn anode during the charge–discharge process, influencing the lifetime of Zn-based aqueous batteries. The prepared Zn@C composite from ZnO@C with electrochemical reduction is robust as the anode for a Zn@C//MnO 2 battery, and a 98.8% retention after 400 cycles is obtained at a discharge rate of 5 C. The specific capacitance of Zn@C//MnO 2 battery can reach 135 mAh g Zn −1 at 3 C, and the energy density of this battery can reach 75.9 Wh Kg −1 . The coated carbon layer on Zn/ZnO plays a role in protecting Zn/ZnO from leaching or corrosion by KOH, so the structure of Zn@C is a key factor in improving the cycling lifetime of Zn-based aqueous batteries.
研究领域:
能源存储
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Energy
·
2020
·Vol. 5
·期 6
·440-449
·
IF 46.495
Zhong Cheng,Liu Bin,Ding Jia,Liu Xiaorui,Zhong Yuwei,Li Yuan,Sun Changbin,Han Xiaopeng,Deng Yida,Zhao Naiqin,Hu Wenbin
Aqueous battery systems feature high safety, but they usually suffer from low voltage and low energy density, restricting their applications in large-scale storage. Here, we propose an electrolyte-decoupling strategy to maximize the full potential of Zn–MnO 2 batteries by simultaneously enabling the optimal redox chemistry of both the Zn and MnO 2 electrodes. The decoupled Zn–MnO 2 battery exhibits an open-circuit voltage of 2.83 V (in contrast to the typical voltage of 1.5 V in conventional Zn–MnO 2 batteries), as well as cyclability with only 2% capacity fading after deep cycling for 200 h. Benefiting from the full utilization of MnO 2 , the Zn–MnO 2 battery is also able to maintain approximately 100% of its capacity at various discharge current densities. We also demonstrate the feasibility of integrating the Zn–MnO 2 battery with a wind and photovoltaic hybrid power generating system. This electrolyte-decoupling strategy is shown to be applicable for other high-performance zinc-based aqueous batteries such as Zn–Cu and Zn–Ag batteries.
研究领域:
能源存储
·
电池技术
·
材料科学
·
可再生能源系统
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Di Jiang,Nan Lu,Leibo Li,Haoqun Zhang,Jiashuang Luan,Guibin Wang
Compressibility of zinc-manganese oxide (Zn-MnO 2 ) batteries is an essential element of modern flexible electronics. Hydrogel electrolytes with superior elasticity and compressibility are highly demand to guarantee a stable energy output of the flexible Zn-MnO 2 battery. Herein, a highly compressible hydrogel electrolyte was developed by introducing soybean protein isolate nanoparticles (SPI) into covalently cross-linked polyacrylamide (PAAM) polymer networks . The SPI/PAAM hydrogel electrolyte for Zn-MnO 2 battery possessed outstanding reversible compressibility due to the aggregation of SPI nanoparticles on the PAAM chains through the weak electrostatic interaction , which could dissipate energy effectively. Consequently, the Zn-MnO 2 battery based on the compressible hydrogel electrolyte displayed a decent specific capacity (299.3 mA h g −1 ) and desirable capacity retention rate (78.2%) after 500 charge/discharge cycles. Notably, the device could maintain stable power output under 96% compress strain and light the bulb even under severe mechanical stimulation like being-bent and hammered. It’s believed that the compressible Zn-MnO 2 batteries hold enormous potential as the energy storage devices in the field of flexible wearable electronics.
研究领域:
材料科学
·
电化学
·
柔性电子
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Guifeng Zhang,Weijun Zhou,Minfeng Chen,Qiuya Wang,Anxin Li,Junling Xu,Jizhang Chen
Benefiting from the advantages in safety, reliability, affordability, and energy/power densities, aqueous zinc-ion batteries (AZIBs) with mildly acidic electrolytes have triggered tremendous research interest. However, Ti foil, as the most widely used current collector for cathodes of AZIBs, is rather expensive. In this work, stainless steel (SS) foil, with a much lower price, is proposed to be a more appropriate current collector than Ti, Ni, Al, and Cu foils. Among them, Ti and SS foils are found to own superior wettability with related solvents, excellent anti-corrosion ability, and strong binding with cathode material. In contrast, Al and Cu foils suffer from severe corrosion in aqueous electrolytes even without external potential, and Ni foil is electrochemically unstable in aqueous electrolytes. Further studies show that only Ti and SS current collectors can enable Zn//MnO 2 battery to work normally. And SS foil behaves slightly better than Ti foil in both Zn//MnO 2 battery and hybrid supercapacitor in terms of specific capacity, rate capability, and cyclability. This work provides guidance for the selection of current collectors for AZIBs and related energy storage devices.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Ping Shen,Yuanyuan Hu,Shanguo Ji,Hao Luo,Cuiping Zhai,Kai Yang
Hydrogel electrolytes are an attractive class of conductive materials for flexible energy storage devices given their reassuring flexibility and stable electrochemical performance . However, it still remains a challenge to assemble the smart battery with mechanical stability and self-healing property when suffering from inevitable physical damages. Here, a novel Zn 2+ -based polyacrylamide/halloysite nanotubes (PAAm/HNTs) nanocomposite hydrogel electrolyte is designed and prepared through rigid HNTs doped into the chemical cross-linked PAAm network. The PAAm/HNTs hydrogel with tensile performance, self-healing property and extended Zn 2+ transport channels was used as hydrogel electrolyte in Zn/MnO 2 batteries which possess an initial capacity of 347 mA h g 1 at a current density of 0.2 A g –1 with good cycle stability. This work offers an effective design method to improve strength , self-healing and fatigue resistance of nanocomposite hydrogel electrolytes which would provide alterative view for the construct of hydrogel electrolytes with desirable properties.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）