MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Ming Song,Xihua Du,Yan Chen,Lei Zhang,Ding Zhu,Yungui Chen
Among all the factors that restrict the application of Li–air battery, large charging polarization, due to the poor bulk charge transport ability of discharge product Li 2 O 2 , comes first. In this paper, we adopt the method of controlling discharging temperature to reduce the charging polarization during the first cycle of Li 2 O 2 based on the fact that controlling discharging temperature can reduce Li 2 O 2 bulk charge transport path since finer Li 2 O 2 particles can be observed at higher temperature. The mechanism of reducing charging polarization simply through increasing the discharging test temperature has also been researched in this paper.
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 Physical Chemistry C
·
2014
·
IF 4.835
Wugang Fan,Xiangxin Guo,Dongdong Xiao,Lin Gu
Gold nanoparticles (AuNPs) anchored to vertically aligned carbon nanotubes (VACNTs) act as additional nucleation sites for the Li2O2 growth, leading to the decreased size while increased density of Li2O2 particles in process of discharge. Correspondingly, at the deep discharge to 2.0 V the batteries show increased specific capacity. Upon charge, the AuNPs exhibit promotion effect on the Li2O2 decomposition by improving the conduction property of the discharge-formed particles, rather than by imposing the conventional electrocatalytic effect on the oxygen evolution reaction. Moreover, the AuNPs show promotion effect on decomposition of carbonate species arising from the side reactions. These effects consequently lead to the reduced charge overpotentials and extended cycle operation of the batteries. The results here provide a new as well as clear picture on the role of incorporated AuNPs in the Li2O2 formation and decomposition, which would be helpful for better understanding and constructing of high-performance air cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Ji-Jun Dong,Chao Ma,Qiang Zhang,Wen-Long Bai,Zhi-Peng Cai,Se-Si Li,Zhen Zhang,Xue-Yan Wu,Xiao Wei,Kai-Xue Wang,Jie-Sheng Chen
Lithium-oxygen batteries (LOBs) with superior energy density are recognized as a promising next-generation energy storage device for electric vehicles. However, the morphology and particle size of Li 2 O 2 as well as the parasitic products Li 2 CO 3 give an essential impact on electrochemical properties . To address these issues, a free-standing Co 3 O 4 -NiO@Ni electrode with Co 3 O 4 -NiO heterostructure nanoneedle arrays on Ni foam was fabricated. The Co 3 O 4 -NiO heterostructure would control the morphology and size of Li 2 O 2 . The free-standing carbon-free electrode design would avoid the generation of Li 2 CO 3 . Ultrathin Li 2 O 2 film is preferentially generated within the Co 3 O 4 -NiO heterostructure nanoneedles during the discharge process. The film-like morphology of Li 2 O 2 would decrease the Li 2 O 2 /electrode interfacial resistance and charge overpotential, and enhance the discharge capacity. The free-standing Co 3 O 4 -NiO@Ni electrode exhibits an improved electrochemical performance with a high discharge specific capacity of 7905 mAh g −1 at 0.1 A g −1 and good cyclic stability of 120 cycles at 0.1 A g −1 with a cutoff capacity of 500 mAh g −1 . This work provides a new strategy for improving the electrochemical performance of LOBs through the morphology control of Li 2 O 2 .
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Xinjian Li,Yanhui Su,Yong Ma,Le Wei,Ying He,Yuting Gu,Shiwei Mei,Qiaoqiao Mu,ChengYuan Peng,Yang Peng,Zhao Deng
Photo-assisted charge/discharge has witnessed marked success in Li-O 2 batteries (LOBs) to overcome the sluggish kinetics of triphasic reactions at the cathode, but challenges remain to develop high-efficiency but low-cost photocathode catalysts. Herein, a photoactive electron mediator is applied, for the first time, as bifunctional photocathode catalyst in solar-assisted LOBs. The facilely synthesized tris(2,2-bipyridine) cobalt(II) complex (Co-bpy) manifests good electrocatalytic activity in dark and high photoactivity under illumination, concertedly affording an superior charge/discharge voltage gap of 0.12 V and round-trip efficiency of 97%. Moreover, a significantly enhanced charge/discharge reversibility was attained under illumination and attributed to the light-induced amorphization of Li 2 O 2 that further extends the cycle life. A two-circuit model is proposed to rationalize the better reduction of charge/discharge polarization at lower operating current density. This work not only extends the family of photocathode catalysts to small-molecule complexes, but also offers new insights into the mechanism of photoenergy storage in LOBs.
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
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Le Wei,Yong Ma,Yuting Gu,Xuzhou Yuan,Ying He,Xinjian Li,Liang Zhao,Yang Peng,Zhao Deng
Rechargeable lithium–oxygen batteries (LOBs) have attracted increasing attention due to their high energy density but highly rely on the development of efficient oxygen catalysts for reversible Li2O2 deposition/decomposition. Herein, highly porous carbon nanocubes with a specific surface area up to 1600 m2 g–1 are synthesized and utilized to tightly anchor Ru nanoparticles for using as the oxygen-cathode catalyst in LOBs, achieving a low charge/discharge potential gap of only 0.75 V, a high total discharge capacity of 17,632 mA h g–1, and a superb cycling performance of 550 cycles at 1000 mA g–1. Comprehensive ex situ and operando characterizations unravel that the outstanding LOB performance is ascribed to the highly porous catalyst structure embedding rich active sites that synergistically function in reducing overpotentials, suppressing parasitic reactions, accommodating reaction products, and promoting mass and charge transportation.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Zhiqian Hou,Shan Feng,Peng Hei,Tingshuai Yang,Zhiqun Ran,Ruixin Zheng,Xin Liao,Chaozhu Shu,Jianping Long
The development of high-efficiency oxygen electrode with well structural and chemical stability is critical to boost the rapid development of lithium-oxygen (Li-O 2 ) batteries. Which are reckoned as a potent contender for next-generation energy storage devices due to their ultra-high theoretical energy density . Here, a flower-like three-dimensional self-standing ZnCo 2 S 4 -based electrode without an addition of binders are fabricated and employing as positive electrode for Li-O 2 batteries. The bifunctional catalytic activity of flower-like ZnCo 2 S 4 is conducive to improving the hysteresis kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Representative ultrathin petal edge exposes adequate active sites and provides a sufficient contact interface between Li 2 O 2 and positive electrode, which are essential for reducing the charge overpotential during OER. Compared with the control electrodes, the flower-like ZnCo 2 S 4 @Ni-based Li-O 2 battery shows decreased overpotential (0.78 V) and improved cycle stability (over 500 cycles).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yihao Liu,Kun Wang,Xiaohui Peng,Chen Wang,Weiwei Fang,Yusong Zhu,Yuhui Chen,Lili Liu,Yuping Wu
To realize the utilization of high-performance lithium–oxygen batteries (LOBs), a rational-designed cathode structure and efficient catalytic materials are necessary. However, side products accumulated during battery cycling seriously affects the performance. Designing a cathode catalyst that could simultaneously facilitate the catalytic efficiency of the main reaction and inhibit the side reactions will make great sense. Herein, NiCeOx was proposed for the first time as a bifunctional cathode catalyst material for LOBs. The combined action of NiO and CeO2 components was expected to facilitate the decomposition of byproducts (e.g., Li2CO3), increase the oxygen vacancy content in CeO2, and enhance the adsorption of oxygen and superoxide. NiCeOx nanorods (NiCeOx PNR) were prepared using electrospinning method. It showed a hollow and porous nanorod (PNR)-like structure, which provided a large number of catalytic active sites and facilitated the transport of reactants and the deposition of discharge products. As a result, a high specific discharge capacity (2175.9 mAh g–1) and a long lifespan (67 cycles at 100 mA g–1 with a limited capacity of 500 mAh g–1) were obtained.
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
·
2020
·
IF 10.652
Yaying Dou,Xin-Gai Wang,Dashuai Wang,Qinming Zhang,Chengyi Wang,Gang Chen,Yingjin Wei,Zhen Zhou
Large overpotential in oxygen reduction and evolution reactions is the intractable obstruction of Li-O 2 batteries, causing inferior round-trip efficiency and diminished cycle life. Modulating the reaction mechanism of Li 2 O 2 is of crucial importance for a high-performance Li-O 2 battery. Herein, we report a composite of amorphous RuO 2 nanoparticles decorated carbon nanotubes (A-RuO 2 @CNT) as an efficient catalyst for Li-O 2 batteries. The amorphous catalyst contains abundant defects and vacancies as well as distorted atom arrangements, which provide sufficient active sites for reactions and enhance the affinity for LiO 2 intermediates. As a result, the formation/decomposition mechanisms of Li 2 O 2 are reasonably regulated. An amorphous film-like Li 2 O 2 product forms and uniformly deposits on the surface of A-RuO 2 @CNT, thus achieving faster redox kinetics and smaller overpotential. When used in Li-O 2 batteries, the amorphous catalyst affords remarkably decreased charge overpotential and enhanced cyclic stability, which is superior to its crystalline counterpart.
研究领域:
储能
·
电化学
·
材料科学
·
纳米材料
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2022
·Vol. 12
·期 21
·2103910
·
IF 29.698
Guoliang Zhang,Gaoyang Li,Jun Wang,Hui Tong,Jianchuan Wang,Yong Du,Shuhui Sun,Feng Dang
2D materials are attracting much attention in the field of cathode catalysts for lithium–oxygen batteries (LOBs) due to their layered structure, unique electronic properties, and high stability. However, different stacking layer structures trigger different catalytic capabilities in LOBs. In this work, tin selenide nanosheets with a black phosphorus-like 2D structure are synthesized and used as the cathode catalyst for LOBs. SnSe nanosheets with exposed stack (200) facets and stack edge facets exhibit superior specific capacity over 20 783 mAh g −1 and ultralong cycle stability over 380 cycles at 500 mA g −1 in LOBs. This demonstrates that the growth of discharge products is mainly concentrated on the 2D surface (200) facets, rather than the stack edge facets. Experimental and theoretical studies reveal that the confined adsorption of Li 2 O 2 on the stack edge facets of SnSe, due to the 2D layer structure and the unique electron distribution, restricts the growth of discharge products. The 2D surface facets of SnSe benefit for the formation and stabilization of LiO 2 intermediates, leading to the efficient formation/decomposition of discharge products. The findings provide in-depth insight into the elusive electrocatalytic mechanism for 2D layer-structures materials in LOBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米催化
·
固态化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaohui Peng,Mingzhe Li,Lihua Huang,Qizhe Chen,Weiwei Fang,Yuyang Hou,Yusong Zhu,Jilei Ye,Lili Liu,Yuping Wu
Developing ideal Li–O2 batteries (LOBs) requires the discharge product to have a large quantity, have large contact area with the cathode, and not passivate the porous surface after discharge, which put forward high requirement for the design of cathodes. Herein, combining the rational structural design and high activity catalyst selection, minor amounts of RuO2-incorporated Co3O4 nanoneedles grown on carbon cloth are successfully synthesized as binder-free integrated cathodes for LOBs. With this unique design, plenty of electron–ion–oxygen tri-phase reaction interface is created, the side reaction from carbon is isolated, and oxygen reduction reaction/oxygen evolution reaction (OER) kinetics are significantly facilitated. Upon discharge, film-like Li2O2 is observed growing on the needle surface first and eventually ball-like Li2O2 particles form at each tip of the needle. The cathode surface remains porous after discharge, which is beneficial to the OER and is rare in the previous reports. The battery exhibits a high specific discharge capacity (7.64 mAh cm–2) and a long lifespan (500 h at 0.1 mA cm–2). Even with a high current of 0.3 mA cm–2, the battery achieves a cycling life of 200 h. In addition, punch-type LOBs are fabricated and successfully operated, suggesting that the cathode material can be utilized in ultralight, flexible electronic devices.
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
Advanced Energy Materials
·
2018
·Vol. 8
·期 18
·1800089
·
IF 21.875
Xiaodong Lin,Ruming Yuan,Senrong Cai,Youhong Jiang,Jie Lei,San-Gui Liu,Qi-Hui Wu,Hong-Gang Liao,Mingsen Zheng,Quanfeng Dong
The nonaqueous lithium–oxygen (Li–O 2 ) battery is considered as one of the most promising candidates for next-generation energy storage systems because of its very high theoretical energy density. However, its development is severely hindered by large overpotential and limited capacity, far less than theory, caused by sluggish oxygen redox kinetics, pore clogging by solid Li 2 O 2 deposition, inferior Li 2 O 2 /cathode contact interface, and difficult oxygen transport. Herein, an open-structured Co 9 S 8 matrix with sisal morphology is reported for the first time as an oxygen cathode for Li–O 2 batteries, in which the catalyzing for oxygen redox, good Li 2 O 2 /cathode contact interface, favorable oxygen evolution, and a promising Li 2 O 2 storage matrix are successfully achieved simultaneously, leading to a significant improvement in the electrochemical performance of Li–O 2 batteries. The intrinsic oxygen-affinity revealed by density functional theory calculations and superior bifunctional catalytic properties of Co 9 S 8 electrode are found to play an important role in the remarkable enhancement in specific capacity and round-trip efficiency for Li–O 2 batteries. As expected, the Co 9 S 8 electrode can deliver a high discharge capacity of ≈6875 mA h g −1 at 50 mA g −1 and exhibit a low overpotential of 0.57 V under a cutoff capacity of 1000 mA h g −1 , outperforming most of the current metal-oxide-based cathodes.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 16
·160536
·
IF 3.721
Yizhao Tang,Hao Cheng,Qinggang He,Hanyu Li,Yue An,Jian Xie,Ronghai Liu
Through a facile, stepwise approach that includes electropolymerization, calcination, a hydrothermal method and low-temperature adsorption, a carbon array was coated with RuO2/MnO2 to form a highly efficient composite catalyst (RuO2/MnO2@carbon array) for Li–O2 batteries. The unique, hierarchical, three-dimensional array-type structure facilitates electrode wetting and oxygen transport as well as providing a large volume for Li2O2 loading. The growth of MnO2 nanosheets on the carbon array surface alters the surface roughness and provides attachment sites for the subsequent loading of catalyst nanoparticles. In addition, the introduction of RuO2 induces the formation of Mn3+ on the surface of MnO2, which not only improves the electrode conductivity but also the catalytic activity for ORR/OER. As a result, conformal growth of thin layers of Li2O2 on the surface of the RuO2/MnO2@carbon array and reversible decomposition of Li2O2 during cycling were achieved. In comparison with cathodes without a carbon array or catalyst, the Li–O2 cell with a RuO2/MnO2@carbon array cathode exhibits an markedly improved performance with high discharge capacity (10 000 mAh g−1 at 100 mA g−1) and long cycling life (252 cycles at 200 mA g−1 with a limited capacity of 500 mAh g−1).
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）