Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 561, Issue -, Pages 195-202Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.11.042
Keywords
Potassium-ion battery; Hollow carbon; Nanosphere-interconnected network; Local graphitized carbon; Excellent performance
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Funding
- National Natural Science Foundation of China, China [51972121, 51602107, U1501242, 21571066, 21671069]
- Guangdong Basic and Applied Basic Research Foundation, China [2019A1515011502]
- Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program, China [2017TQ04C419]
- Program for Pearl River New Star of Science and Technology in Guangzhou [201710010104]
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Potassium-ion batteries (KlBs) have been developed as an emerging electrochemical energy storage device due to the low cost and abundant resource of potassium. However, they suffer insufficient cyclability and poor rate capability caused by the large le, severely limits their further applications. Herein, a nanonetwork-structured carbon (NNSC) is reported to address the issue. Cycling stability with very low decay rate of 0.004% per cycle over 2000 cycles and excellent rate capability (i.e., 261 mAh g(-1), at 100 mA g(-1), and 108 mAh g(-1) at 5000 mA g(-1)) are achieved. The superior performance is attributed to the unique structure of NNSC, in which the three-dimensional interconnected hierarchical porous structure with hollow nanosphere as network units not only can effectively alleviate the volume expansion induced by the insertion of large K+ but also can offer fast pathways for K+ diffusion. In addition, the local graphitized carbon shell of NNSC can promote conductivity of material and reduce the resistance to K+ transportation. Thus, the NNSC has great potential in developing stable-structure and high-rate electrodes for next generation KIBs. (C) 2019 Elsevier Inc. All rights reserved.
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