Difference in Electrochemical Mechanism of SnO2 Conversion in Lithium-Ion and Sodium-Ion Batteries: Combined in Operando and Ex Situ XAS Investigations

被引:62
作者
Dixon, Ditty [1 ,4 ]
Avila, Marta [2 ]
Ehrenberg, Helmut [1 ]
Bhaskar, Aiswarya [1 ,3 ,4 ]
机构
[1] Karlsruhe Inst Technol, IAM, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
[2] ALBA Synchrotron, Carrer Llum 2-26, Barcelona 08290, Spain
[3] Helmholtz Inst Ulm Electrochem Energy Storage HIU, Albert Einstein Allee 11, D-89081 Ulm, Germany
[4] CSIR CECRI, Electrochem Power Sources Div, Karaikkudi 630003, Tamil Nadu, India
关键词
RAY-ABSORPTION SPECTROSCOPY; ANODE MATERIALS; SNO2/GRAPHENE COMPOSITE; ELECTRODE MATERIALS; POWDER DIFFRACTION; TEMPERATURE; OXIDE; PERFORMANCE; CAPACITY; GRAPHENE;
D O I
10.1021/acsomega.9b00563
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Conversion and alloying type negative electrodes attracted huge attention in the present research on lithium/sodium-ion batteries (LIBs/SIBs) due to the high capacity delivered. Among these, SnO2 is investigated intensively in LIBs due to high cyclability, low reaction potential, cost-effectiveness, and environmental friendliness. Most of the LIB electrodes are explored in SIBs too due to expected similar electrochemical performance. Though several LIB negative electrode materials successfully worked in SIBs, bare SnO2 shows very poor electrochemical performance in SIB. The reason for this difference is investigated here through combined in operando and ex situ X-ray absorption spectroscopy (XAS). For this, the electrodes of SnO2 (space group P42/mnm synthesized via one-pot hydrothermal method) were cycled in Na-ion and Li-ion half-cells. The Na/SnO2 half-cell delivered a much lower discharge capacity than the Li/SnO2 half-cell. In addition, higher irreversibility was observed for Na/SnO2 half-cell during electrochemical investigations compared to that for Li/SnO2 half-cell. In operando XAS investigations on the Na/SnO2 half-cell confirms incomplete conversion and alloying reactions in the Na/SnO2 half-cell, resulting in poor electrochemical performance. The difference in the lithiation and sodiation mechanisms of SnO2 is discussed in detail.
引用
收藏
页码:9731 / 9738
页数:8
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