为提高锂硫电池的循环性能,采用水热法制备负载有硫化锰（MnS）的竹炭（BC）复合材料MnS@BC,通过热复合获得负载S的BC复合材料S-BC和负载S、MnS的BC复合材料S-MnS@BC。SEM和XRD分析表明：MnS@BC中MnS可填充BC表面的孔洞,并呈不均匀分布...为提高锂硫电池的循环性能,采用水热法制备负载有硫化锰（MnS）的竹炭（BC）复合材料MnS@BC,通过热复合获得负载S的BC复合材料S-BC和负载S、MnS的BC复合材料S-MnS@BC。SEM和XRD分析表明：MnS@BC中MnS可填充BC表面的孔洞,并呈不均匀分布;没有出现MnS的衍射峰。电化学性能测试结果表明：负载于BC上的MnS本身没有电化学活性,但对多硫离子的氧化还原过程有催化作用,可提高电极的可逆性。S-MnS@BC复合材料电极以100 m A/g的电流在1.5~3.0 V充放电,首次放电比容量为1 346.1 m Ah/g,第50次循环的放电比容量保持在504.0 m Ah/g,在同等条件下的性能好于S-BC复合材料,表现出较轻的“飞梭效应”和较好的循环性能。展开更多
Manganese sulfide is often referred to as one of important inhibitors in grain-oriented electrical steels, which is of great importance to yield strong Goss texture. However, the early stage of nucleation for such inh...Manganese sulfide is often referred to as one of important inhibitors in grain-oriented electrical steels, which is of great importance to yield strong Goss texture. However, the early stage of nucleation for such inhibitors and their evolution during the processing has not been well understood. In present work we selected a Fe-3.12wt.%Si- 0.11wt.%Mn-0.021wt.%S model system and used FE-SEM and atom probe tomography （APT） to investigate the precipitation behavior of MnS inhibitors at near atomic scale. It was found that the Si-S enriched clusters with sizes of 5-15 nm were formed close to the MnS particles. The density of inhibitors decreased after large pseudo-plane-strain compression because of the effect of dislocation motion, and then slightly increased again when sample was aged at 200℃ for 48 h. The dislocations and grain boundaries can act as fast diffusion paths and assist the reemergence of Si-S enriched clusters.展开更多
文摘为提高锂硫电池的循环性能,采用水热法制备负载有硫化锰（MnS）的竹炭（BC）复合材料MnS@BC,通过热复合获得负载S的BC复合材料S-BC和负载S、MnS的BC复合材料S-MnS@BC。SEM和XRD分析表明：MnS@BC中MnS可填充BC表面的孔洞,并呈不均匀分布;没有出现MnS的衍射峰。电化学性能测试结果表明：负载于BC上的MnS本身没有电化学活性,但对多硫离子的氧化还原过程有催化作用,可提高电极的可逆性。S-MnS@BC复合材料电极以100 m A/g的电流在1.5~3.0 V充放电,首次放电比容量为1 346.1 m Ah/g,第50次循环的放电比容量保持在504.0 m Ah/g,在同等条件下的性能好于S-BC复合材料,表现出较轻的“飞梭效应”和较好的循环性能。
基金Acknowledgements The authors gratefully appreciate the financial support from the National Natural Science Foundation of China （Grant No. 51171019） and China＇s State Grid Corporation of Science and Technology Projects （SGRI-WD-71-13-002）.
文摘Manganese sulfide is often referred to as one of important inhibitors in grain-oriented electrical steels, which is of great importance to yield strong Goss texture. However, the early stage of nucleation for such inhibitors and their evolution during the processing has not been well understood. In present work we selected a Fe-3.12wt.%Si- 0.11wt.%Mn-0.021wt.%S model system and used FE-SEM and atom probe tomography （APT） to investigate the precipitation behavior of MnS inhibitors at near atomic scale. It was found that the Si-S enriched clusters with sizes of 5-15 nm were formed close to the MnS particles. The density of inhibitors decreased after large pseudo-plane-strain compression because of the effect of dislocation motion, and then slightly increased again when sample was aged at 200℃ for 48 h. The dislocations and grain boundaries can act as fast diffusion paths and assist the reemergence of Si-S enriched clusters.
