AI Article Synopsis
- Increasing the cut-off voltage of lithium cobalt oxide (LCO) is a strategy to meet the demand for high energy density, but it leads to structural damage due to irreversible phase transitions.
- The study investigates the role of an anion chelating agent, tris(pentafluorophenyl) borane (TPFPB), in stabilizing the electrode-electrolyte interface (EEI) of LCO.
- By using TPFPB additives in a special electrolyte, researchers were able to create a stable LiF-rich CEI layer, significantly improving the cycling stability of Li/LCO half cells and Gr/LCO pouch cells at high voltage.
Article Abstract
Increasing cut-off voltage of lithium cobalt oxide (LCO) (>4.6 V) is an effective strategy to satisfy the ever-increasing demand for high energy density. However, the irreversible phase transition significantly destroys the structure of high-voltage LCO, especially the surface lattice. Considering that the structural stability of LCO is primarily dominated by the intrinsic merits of electrode-electrolyte interface (EEI), we explored and disclosed the operating mechanism of anion chelating agent tris(pentafluorophenyl) borane (TPFPB) and regulate the CEI layer on LCO electrode. Benefiting from the high HOMO energy level and preferential decomposition of TPFPB-PF , a robust LiF-rich CEI layer is constructed and greatly improves the stability of electrode/electrolyte interface. The well-designed electrolyte composed of 1 mol L LiPF in EC/EMC with TPFPB additives endows Li/LCO half cells and 4 Ah Gr/LCO pouch cell with enhanced cycling stability under a high voltage condition. This work provides pave a new direction for the development of economical high-voltage LIBs.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/chem.202403042 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!