物理化学学报2017，Vol.33Issue(5)：968-975,8.DOI:10.3866/PKU.WHXB201702093
不同生物炭材料的制备及其在Li-S电池中的应用
Preparation of Biochar from Different Biomasses and Their Application in the Li-S Battery
摘要
Abstract
Biochar derived from reproducible massive biomasses presents the advantages of low cost and renewable resources.In this work aiming to solve the existing problems of the lithium-sulfur battery,sulfur@biochar (S@biochar) composite cathode materials with high capacity and good cycle performance were developed.Specifically,four kinds of biochar prepared from rice husk,miscanthus,fir,and pomelo peel were used as host matrices for the Li-S battery.Among them,the S@biochar derived from rice husk delivered the highest specific capacity and the best cycle stability according to electrochemical tests.To further optimize its performance,we prepared a highly porous rice husk derived biochar (HPRH-biochar) using silica gel as the template.The S@HPRH-biochar composite (60％ (w,mass fraction) S) enables the homogeneous dispersion of amorphous sulfur in the carbon matrix and its porous structure could effectively suppress the dissolution of the polysulfide.As a result,its electrochemical performance improved,achieving a high initial charge capacity of 1534.1 mAh· g-1 and maintaining a high capacity of 738.7 mAh· g 1 after 100 cycles at 0.2C (1C corresponds to a current density of 1675 mA·g-1).It also gives a capacity of 485.3 mAh·g 1 at 2.0C in the rate capacity test.关键词
锂硫电池/复合物/稻壳/芒草/杉木/柚子皮Key words
Li/S battery/Composite/Rice husk/Miscanthus/Fir/Pomelo peel分类
化学化工引用本文复制引用
李君涛,吴娇红,张涛,黄令..不同生物炭材料的制备及其在Li-S电池中的应用[J].物理化学学报,2017,33(5):968-975,8.基金项目
The project was supported by the National Natural Science Foundation of China (21373008) and Fundamental Research Funds for the Central Universities,China (20720160124).国家自然科学基金(21373008)和中央高校基本科研业务费(20720160124)资助项目 （21373008）
