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首页> 美国卫生研究院文献>ACS Omega >Difference in Electrochemical Mechanism of SnO2 Conversionin Lithium-Ion and Sodium-Ion Batteries: Combinedin Operando and Ex Situ XAS Investigations
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Difference in Electrochemical Mechanism of SnO2 Conversionin Lithium-Ion and Sodium-Ion Batteries: Combinedin Operando and Ex Situ XAS Investigations

机译：SnO2转化的电化学机理差异锂离子和钠离子电池中的电池：组合在Operando和异地XAS调查中

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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 mechanismsof SnO2 is discussed in detail.
机译：转换和合金化负极由于其高容量而在锂/钠离子电池（LIB / SIB）的当前研究中引起了极大的关注。其中，由于高循环性，低反应潜力，成本效益和环境友好性，在LIB中对SnO2进行了深入研究。由于预期的相似的电化学性能，大多数LIB电极也在SIB中进行了研究。尽管几种LIB负极材料已成功在SIB中工作，但裸露的SnO2在SIB中显示出非常差的电化学性能。在此通过操作和非原位X射线吸收光谱（XAS）结合研究了这种差异的原因。为此，在Na离子和Li离子半电池中循环使用SnO2电极（通过一锅水热法合成的空间群P42 / mnm）。 Na / SnO2半电池的放电容量比Li / SnO2半电池低得多。此外，与Li / SnO2半电池相比，在电化学研究期间，Na / SnO2半电池具有更高的不可逆性。在操作中，XAS对Na / SnO2半电池的研究证实了Na / SnO2半电池中的不完全转化和合金化反应，导致电化学性能较差。锂化和胶结机制的差异SnO2的详细讨论。

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