Hard–Soft Composite Carbon as a Long-Cycling and High-Rate Anode for Potassium-Ion Batteries
Zelang Jian,Sooyeon Hwang,Zhifei Li,Alexandre S. Hernandez,Xingfeng Wang,Zhenyu Xing,Dong Su,Xiulei Ji +7 more
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TLDR
In this paper, nongraphitic carbons as K-ion anodes with sodium carboxymethyl cellulose as the binder are systematically investigated, and a hard-soft composite carbon with 20 wt% soft carbon distributed in the matrix phase of hard carbon microspheres exhibits highly amenable performance: high capacity, high rate capability, and very stable long-term cycling.Abstract:
There exist tremendous needs for sustainable storage solutions for intermittent renewable energy sources, such as solar and wind energy. Thus, systems based on Earth-abundant elements deserve much attention. Potassium-ion batteries represent a promising candidate because of the abundance of potassium resources. As for the choices of anodes, graphite exhibits encouraging potassium-ion storage properties; however, it suffers limited rate capability and poor cycling stability. Here, nongraphitic carbons as K-ion anodes with sodium carboxymethyl cellulose as the binder are systematically investigated. Compared to hard carbon and soft carbon, a hard–soft composite carbon with 20 wt% soft carbon distributed in the matrix phase of hard carbon microspheres exhibits highly amenable performance: high capacity, high rate capability, and very stable long-term cycling. In contrast, pure hard carbon suffers limited rate capability, while the capacity of pure soft carbon fades more rapidly.read more
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Nitrogen-doped carbon microfiber networks decorated with CuO/Cu clusters as self-supported anode materials for potassium ion batteries
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Edge-Oxidation-Induced Densification towards Hybrid Bulk Carbon for Low-Voltage, Reversible and Fast Potassium Storage
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TL;DR: In this article , an edge-oxidation-induced densification strategy is reported to construct hybrid bulk carbon, in which the edge-oxygen of oxidized pitch serves as the cross-linking agent to in-situ conduct the densification.
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