Enhancement of Mn-doped LiPON electrolyte for higher performance of all-solid-state thin film lithium battery. (April 2023)

• Record Type: Journal Article
• Authors: Song, Xinyi; Yu, Wenhua; Zhou, Shuyu; Zhao, Liuyang; Li, Aikui; Wu, Aimin; Li, Lianchi; Huang, Hao
• Is Part Of: Materials today physics. Volume 33(2023)
• Publication Date: 2023-04
• Subjects: LiPON thin Film electrolyte -- Mn-ions doping -- All-solid-state thin film lithium battery -- Magnetron sputtering; Materials science -- Periodicals; Physics -- Periodicals; Electronic journals; 530.41
• DOI: 10.1016/j.mtphys.2023.101037
• Languages: English
• ISSNs: 2542-5293

Abstract

Abstract: Mn-doped amorphous LiPON solid electrolyte films has been deposited by magnetron sputtering, and the effect of Mn on the electrochemical performance of LiPON electrolyte was systematically studied in this work. The results show that this electrolyte film effectively enhanced the network cross-linked structure and facilitated the migration of Li + with an ionic conductivity as high as 5.00 × 10 −6 S/cm. The decomposition voltage analyzed by CV and LSV is above 5 V, and the ion migration number reaches 0.999. The doping of Mn-ions increases the intrinsic work function of LiPON and reduces the V CPD between LiPON and LiCoO2, beneficial to enhance the electrochemical stability of the contact interface. All-solid-state thin film lithium battery (TFLB) with the structure of LiCoO2 /LiPON–Mn/Li have been fabricated by Mn-doped LiPON electrolyte layer, showing a high cycle and rate performance. We suggested that the Mn-doping is an effective approach to enhance the electrochemical performance of LiPON electrolyte, and lower the Li + migration barrier at the LiCoO2 /LiPON interface. Highlights: Mn-doping inhibits the blocking effect of space charge layer on Li +, which is verified by Kelvin probe force analysis, meanwhile, weakens binding of Li + by PO3 N 4− tetrahedra. The formation of Mn–N bonds enhanced the network cross-linked structure and provided more channels for the rapid migration of Li + . Mn–O bonds are strongly covalent, which is beneficial to reduce the constraint effect of O on Li + . LiCoO2 is fabricated by in-situ annealing at up to 550 °C, which strengthens the binding force of the membrane groups.