A simple and recyclable molten-salt route to prepare superthin biocarbon sheets based on the high water-absorbent agaric for efficient lithium storage. (February 2020)

• Record Type: Journal Article
• Authors: Qi, Xingtao; Zhang, Hai; Li, Chao; Chen, Deliang; Sun, Chenghua; Yang, Zhenyu
• Is Part Of: Carbon. Volume 157(2020)
• Page Start: 286
• Page End: 294
• Publication Date: 2020-02
• Subjects: Recyclable molten-salt route -- Agaric -- Porous ultrathin biomass carbon nanosheets -- Efficient lithium storage; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.10.050
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Due to its sustainability, biomass materials shows great potential in replacing mineral carbon source to fabricate high-energy electrode materials, and efficient routes have been explored to synthesize and regulate biomass-derived carbonaceous materials with rational structures to enable their applications. Herein, a simple and recyclable molten-salt route is used to synthesize porous ultrathin biocarbon nanosheets from biomass (agaric). Due to the excellent adsorption ability of agaric for molten-salt ions, the interior and exterior of the agaric was fully exposed to the molten-salts, the fluidity and thermal motion of the high-temperature ionic solution promoted the complete exfoliation of biomass. The obtained superthin porous 2D carbon nanosheets provided more active sites and shortened the diffusion distance for lithium ion insertion/deinsertion, and formed a continuous conducting network for electron transport. Consequently, when used as the anodic material for lithium storage, the electrode displayed a higher specific capacity (∼795 mAh g −1 at 0.1 A g −1 ), outstanding rate performance (∼382 and ∼331 mAh g −1 at 5 and 10 A g −1 ), and superior cyclic stability (no capacity decay after 1000 cycles at 1 A g −1 ). Therefore, the preparation of sustainable biocarbon materials by the recyclable, molten-salt-assisted method described in this paper will enable the practical application of such materials in various energy storage devices. Graphical abstract: Image 1