The Beneficial Impact of Mineral Content in Spent-Coffee-Ground-Derived Hard Carbon on Sodium-Ion Storage

被引:6
作者
Harizanova, Sonya [1 ]
Uzunov, Ivan [1 ]
Aleksandrov, Lyubomir [1 ]
Shipochka, Maria [1 ]
Spassova, Ivanka [1 ]
Kalapsazova, Mariya [1 ]
机构
[1] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, Sofia 1113, Bulgaria
关键词
hard carbon; spent coffee grounds; sodium-ion storage; mineral content; albite; ASH-FORMING ELEMENTS; CHEMICAL-COMPOSITION; PERFORMANCE; BIOMASS; TEMPERATURE; ANODE; BATTERIES; HEMICELLULOSE; CAPACITY; INDUSTRY;
D O I
10.3390/ma17051016
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The key technological implementation of sodium-ion batteries is converting biomass-derived hard carbons into effective anode materials. This becomes feasible if appropriate knowledge of the relations between the structure of carbonized biomass products, the mineral ash content in them, and Na storage properties is gained. In this study, we examine the simultaneous impact of the ash phase composition and carbon structure on the Na storage properties of hard carbons derived from spent coffee grounds (SCGs). The carbon structure is modified using the pre-carbonization of SCGs at 750 degrees C, followed by annealing at 1100 degrees C in an Ar atmosphere. Two variants of the pre-carbonization procedure are adopted: the pre-carbonization of SCGs in a fixed bed and CO2 flow. For the sake of comparison, the pre-carbonized products are chemically treated to remove the ash content. The Na storage performance of SCG-derived carbons is examined in model two and three Na-ion cells. It was found that ash-containing carbons outperformed the ash-free analogs with respect to cycling stability, Coulombic efficiency, and rate capability. The enhanced performance is explained in terms of the modification of the carbon surface by ash phases (mainly albite) and its interaction with the electrolyte, which is monitored by ex situ XPS.
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页数:20
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