# Interface Construction via Scavenging Oxygen Species Enables High‐Performance Li‐Rich Layered Oxide Cathode

## TL;DR

This paper introduces a new electrolyte strategy that improves the performance and stability of lithium-rich oxide cathodes in batteries by scavenging harmful oxygen species.

## Contribution

A dual B/P-containing additive electrolyte is proposed to scavenge reactive oxygen species and form a stable cathode interface.

## Key findings

- The modified electrolyte enables 94.4% capacity retention after 200 cycles at high mass loading.
- A 4.5 Ah pouch cell achieves 282.5 Wh kg−1 energy density with stable cycling over 50 cycles.
- The electrolyte suppresses electrolyte decomposition and transition metal dissolution in LRLO cathodes.

## Abstract

Lithium‐rich layered oxide (LRLO) is a promising material for high‐energy‐density lithium‐ion batteries (LIBs), yet its practical application is hindered by the nucleophilic attack of reactive oxygen species (ROS) on carbonate electrolytes, inducing severe interfacial incompatibility. Herein, a LiPF6‐based carbonate electrolyte modified by dual B/P‐containing additives with oxygen scavenging capability is developed to mitigate these issues. The designed electrolyte enables efficient ROS scavenging and in situ formation of a robust cathode/electrolyte interface (CEI) on the LRLO surface. The designed electrolyte not only enhances the reversibility of anionic redox reactions (ARRs) but also suppresses electrolyte decomposition and transition metal dissolution. Electrochemical tests demonstrate that the Li//LRLO cell with a high mass loading of 15 mg cm−2 retains 94.4% of its initial capacity after 200 cycles, while the 4.5 Ah graphite//LRLO pouch cell exhibits a higher energy density of 282.5 Wh kg−1 with stable cycling over 50 cycles. This work offers a viable strategy for interface engineering of LRLO‐based cathodes, paving the way for the development of high‐performance LIBs with long‐term cyclic stability.

To inhibit electrolyte decomposition by nucleophilic attack in carbonate electrolyte, LiBOB and LiDFOP with strong oxygen scavenging ability are selected to quench reactive oxygen species and following construct a robust CEI film on the LRLO cathode. The electrochemical performance of the LRLO cathode is largely improved, attributed to decomposition suppression and structural stability, when cycled in C‐BP electrolyte.