中文摘要：

转变金属 dichalcogenides (TMD ) 由于他们的像三明治的分层的结构作为 lithium/ 钠离子电极材料展出巨大的潜力。优化他们的 lithium/sodium-storage 表演，二个问题应该被处理：根本上理解发生在 TMD 电极和发展中的新奇 TMD 的化学反应。在这研究， WSe ₂ 六角形的 nanoplates 作为 lithium/sodium-ion 被综合电池(解放 / 亲族) 电极材料。为解放， WSe ₂-nanoplate 电极完成了一个稳定的可逆能力和高率能力，以及多达 1,500 的 ultralong 周期生活在 1,000 妈敢楬杮瀠潲散畤敲 ? 牯猠煥敵据 ? 敤楳湧骑车

英文摘要：

Transition-metal dichalcogenides （TMDs） exhibit immense potential as lithium/ sodium-ion electrode materials owing to their sandwich-like layered structures. To optimize their lithium/sodium-storage performance, two issues should be addressed： fundamentally understanding the chemical reaction occurring in TMD electrodes and developing novel TMDs. In this study, WSe2 hexagonal nanoplates were synthesized as lithium/sodium-ion battery （LIB/SIB） electrode materials. For LIBs, the WSe2-nanoplate electrodes achieved a stable reversible capacity and a high rate capability, as well as an ultralong cycle life of up to 1,500 cycles at 1,000 mA·g^-1. Most importantly, in situ Raman spectroscopy, ex situ X-ray diffraction （XRD）, transmission electron microscopy, and electrochemical impedance spectroscopy measurements performed during the discharge-charge process clearly verified the reversible conversion mechanism, which can be summarized as follows： WSe2 ＋ 4Li^＋ ＋ 4e^- ←→ W ＋ 2Li2Se. The WSe2 nanoplates also exhibited excellent cycling performance and a high rate capability as SIB electrodes. Ex situ XRD and Raman spectroscopy results demonstrate that WSe2 reacted with Na^＋ more easily and thoroughly than with Li^＋ and converted to Na2Se and tungsten in the Ist sodiated state. The subsequent charging reaction can be expressed as Na2Se → Se ＋ 2Na^＋＋ 2e^-, which differs from the traditional conversion mechanism for LIBs. To our knowledge, this is the first systematic exploration of the lithium/sodium-storage performance of WSe2 and the mechanism involved.