One-dimensional NiS-CNT@Li7P3S11 nanocomposites as ionic/electronic additives for LiCoO2 based all-solid-state lithium batteries

Increasing active material content is critical to realize high energy density for all-solid-state lithium bat-teries (ASSLBs), which is generally impeded by limited ionic/electronic conductions in cathode layer. Herein, one-dimensional NiS-CNT@Li7P3S11 nanocomposites are synthesized by wet chemistry method and possess high mixed ionic/electronic conductivities. When employed as additives for LiCoO2, the NiS-CNT@Li7P3S11 nanocomposites can efficiently improve the electrochemical performances of LiCoO2 cathode in the ASSLBs. Specifically, the resultant Li/75%Li2S-24%P2S5-1%P2O5/Li10GeP2S12/LiCoO2-5%NiS-CNT@Li7P3S11 ASSLBs with 70 wt% LiCoO2 content deliver a reversible capacity of 114.3 mAh g(-1) after 50 cycles under 0.1 C and 99.6 mAh g(-1) at 0.5 C after 100 cycles at room temperature. Even if the active material LiCoO2 content increases to 80%, a high reversible discharge capacity of 124 mAh g(-1) can be achieved at 0.05 C after 25 cycles. Obviously, the excellent electrochemical performances are attributed to the improved ionic/electronic conductivities with assistance of NiS-CNT@Li7P3S11. This work provides an efficient strategy to design cathode materials with high ionic/electronic conductivities and paves the way for the practical application of ASSLBs. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The study focuses on enhancing the electrochemical performance of LiCoO2 cathode in all-solid-state lithium batteries by synthesizing NiS-CNT@Li7P3S11 nanocomposites. The nanocomposites effectively improved the reversible capacity and discharge capacity of the LiCoO2 cathode in the solid-state batteries.