Enhancement of Mn-doped LiPON electrolyte for higher performance of all-solid-state thin film lithium battery

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 x 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 VCPD 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.

Automated summary

Mn-doped amorphous LiPON solid electrolyte films were deposited using magnetron sputtering, and the influence of Mn on the electrochemical performance of LiPON electrolyte was studied. The doping of Mn resulted in enhanced network cross-linked structure and facilitated Li+ migration, leading to an ionic conductivity of up to 5.00 x 10-6 S/cm. The Mn-doped LiPON electrolyte also improved the electrochemical stability of the contact interface, enabling the fabrication of high-performance thin film lithium batteries.