Lithiation mechanism of silver nanowires as negative electrode materials for lithium-ion batteries
In order to explore the lithiation mechanism of silver nanowires at different working voltages,with the help of high-resolution technique and electron diffraction technique of in situ transmission electron microscopy,the phase transition process and morphology transition of silver nanowires during lithiation under different working voltages were studied.The results show that when metallic silver is used as the negative electrode material of the battery,its working voltage has a great influence on the activity of the electrode material;silver has a large amount of lithium storage at low operating voltage,and the electrode material is not easy to fail.When the oper-ating voltage is-1 V,the Ag nanowires first form LiAg phase during the process of storing lithium ions,and there is no obvious volume deformation.With the subsequent increase of lithiation time,when the x in LixAg alloy exceeds 1,the nanowires are pulverized to form Li3Ag and Li9Ag phases;when the applied voltage is-2 V,lithium ions are rapidly transported on the surface of nanowires and react with Ag,and leading to the fragmenta-tion of nanowires.
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