JOURNAL OF POWER SOURCES
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2015
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IF 6.217
Ke Wang,Shan Gao,Zhaolong Du,Anbao Yuan,Wei Lu,Liwei Chen
Practical supercapacitor devices require high areal capacitance and areal power density, and thus demand high utilization of active material and good rate performance under high areal mass loading. However, ion transport in high-mass-loading electrodes can be a challenge, which leads to deteriorate specific capacitance and rate performance. In this paper, a well-dispersed porous MnO 2 -carbon nanotube (CNT) composite was prepared for use as a supercapacitor electrode material . The small MnO 2 nanoparticles and porous CNT network facilitated fast electron/ion transfer kinetics in the electrode. With a mass loading as high as 6.4 mg cm −2 on the electrode, the MnO 2 -CNT composite exhibited an excellent areal capacitance of 1.0 F cm −2 at 0.2 A g −1 (1.28 mA cm −2 ), with a retention of 77% even at a high current density of 20 A g −1 (128 mA cm −2 ). The electrode exhibited a high power density of 45.2 kW kg −1 (0.29 W cm −2 ) while maintaining a reasonable energy density of 16.7 Wh kg −1 (106 μWh cm −2 ). No apparent fading was observed even after 3000 charge/discharge cycles at 1 A g −1 . This porous and evenly distributed MnO 2 -CNT composite has great potential for practical applications in supercapacitors .
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
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2022
·
IF 4.654
Difeng Wei,Xuexian Yu,Yingwu Luo,Xiang Gao,Sainan Ma
Silicon monoxide (SiO) is a promising anode material for the next-generation lithium-ion batteries (LIBs) due to its higher capacity than graphite and better cycle life than pure silicon. However, the issues of volume changes, low mass loading, and poor conductivity still exist. In this study, an economic battery manufacturing technique is developed to promote the performance of commercial SiO/C-based batteries. A novel triblock copolymer binder was synthesized and used to relieve the volume changes and improve ion transportation. Copper nanowires were adopted in the anode material to improve electrical conductivity. A high mass loading anode with a laminated conductive structure was fabricated by spraying a layer upon layer. The synthesized SiO/C exhibits a high specific capacity retention of 606 mA h g–1 after 200 cycles at a high areal mass loading of 10.26 mg cm–2. Furthermore, under a current density of 1 C (1255 mA g–1), it delivers a reversible rate capacity of 620 mA h g–1. This novel design paves a new way to fabricate high-performance SiO-based anodes for commercial LIB applications.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
·
2022
·Vol. 61
·期 45
·e202212338
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IF 16.823
Long Kuai,Li Liu,Qingmei Tao,Nan Yu,Erjie Kan,Na Sun,Shoujie Liu,Baoyou Geng
The two-dimensional nanosheets are conducive to not only endow opened surfaces for loading active metal atoms but also boost the mass transfer for the heterogeneous reactions. The challenge is how to load and stabilize single-atoms on nanosheets in high-areal densities. This work reports an efficient micro-gas blasting (MGB) strategy to access versatile noble metal single-atoms/metal oxide nanosheets, including Ir 1 /CoO x , Pd 1 /CeO 2 , etc . Especially for Pt/CeO 2 nanosheets (Pt 1 /CeO 2 −S), the Pt loading is increased to 15 at%. The Pt 1 /CeO 2 −S catalysts from MGB are revealed to possess superior reactivity and tolerance in the model reaction of water-gas shift (WGS). The Pt 1 /CeO 2 −S catalyst exhibit 2–3 times reactivity that of their thicker counterpart, single-atom Pt 1 /CeO 2 microspheric catalyst. Moreover, the single-atom sites in Pt 1 /CeO 2 −S (1–10 %) catalysts are stable in a harsh WGS reaction condition of 10 % CO. This work thus paves a way to access the practical single-atom catalysts. Graphical An efficient and general micro-gas blasting (MGB) synthesis is developed to access versatile high-areal density noble metal single-atoms/metal oxide nanosheets, including Pt 1 /CeO 2 , Ir 1 /CoO x , Pd 1 /CeO 2 , etc. The as-prepared Pt 1 /CeO 2 −S catalysts are revealed to possess superior reactivity and tolerance than routinely structured alternatives by using water-gas shift (WGS) as a model reaction.
研究领域:
催化化学
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纳米材料科学
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表面科学
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能源化学
·
多相催化
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Xiao Yu,Qi Liu,Zhenqian Wu,Wenxia Zhao,Ruimei Xu,Yong Liu
Flexible and foldable Li-ion batteries (LIBs) are presently attracting immense research interest for their potential use in wearable electronics but are still limited to electrodes with very small mass loading, low bending/folding endurance, and poor electrochemical stability during repeated bending and folding movements. Moreover, one-dimensional (1D) structured electrode materials have shown excellent electrochemical performance but are still restricted by the high cost and complicated fabrication process. Here, we present a very simple yet novel approach for fabricating extra-long Li4Ti5O12 (LTO) and LiCoO2 (LCO) nanofiber precursors by directly stirring the reagents in an atmospheric vessel. In addition, we present multilayer pyramid/inverted pyramid interlocking inside the LTO and LCO nanofiber films as well as between films and current collectors, which can create strengthened interfacial bonding like a zipper and tangentially disperse the strains generated during folding through the pyramidal planes and edges, leading to the realization of thick-film electrodes with outstanding electrochemical stability during folding movements. The foldable LIBs that are assembled with LTO and LCO nanofiber electrodes at a practical level of mass loading (14.9–19.4 mg cm–2) can maintain 102% of the initial capacity after 15 000 times of fully folding (180°) motions.
研究领域:
材料科学
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电化学
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纳米技术
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）