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Lithiation/Delithiation Behavior of Silver Nitrate as Lithium Storage Material for Lithium Ion Batteries

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journal contribution
posted on 25.05.2017, 00:00 by Peng Li, Hua Lan, Lei Yan, Shangshu Qian, Haoxiang Yu, Xing Cheng, Nengbing Long, Miao Shui, Jie Shu
In this work, AgNO3/CNTs composite is synthesized through a simple solution method. The morphology, electrochemical property, and lithium storage mechanism of AgNO3/CNTs are thoroughly investigated and compared with bare AgNO3. For AgNO3, it can deliver an initial charge capacity of 552.3 mAh g–1. After 100 cycles, AgNO3 only retains a capacity of 84.5 mAh g–1 with inferior capacity retention of 15.3%. In contrast, AgNO3/CNTs composite presents the first charge capacity of 530.3 mAh g–1 with capacity retention of 92.5% after 100 cycles (482.5 mAh g–1). The enhanced performance can be ascribed to the introduction of carbon nanotube networks interlaced with AgNO3 particles. Furthermore, the reaction mechanism of AgNO3 with Li is also studied by various in situ and ex situ methods. It can be seen that the preliminary reaction between AgNO3 and Li leads to the irreversible formation of LiNO3, Li3N, Li2O, and Ag. With further reaction at low potentials, the resulting Ag reacts with Li to form Ag3Li10 alloys. Upon a reverse charge process, the lithium storage capacity is associated with the dealloying reaction of Ag3Li10 to the formation of Ag and Li. In the following cycles, the reversible capacity is maintained by Ag–Li alloying/dealloying reaction.