Major Contributions

1. Development of a New Salt Additive:
The study introduces lithium 1-fluoro benzimidazole (Li-1FB) as a novel electrolyte additive for high-voltage spinel LiNi0.5Mn1.5O4LiNi0.5​Mn1.5​O4​ (LNMO) cathodes. This additive is designed to enhance the electrochemical performance by delaying intermediate phase transitions and preventing manganese dissolution, which are common issues in LNMO cathodes

2. Improvement in Electrochemical Stability:
The research demonstrates that Li-1FB can significantly improve the cycle performance of LNMO cathodes in both half-cell and full-cell configurations. This improvement is attributed to the additive's ability to inhibit hydrofluoric acid formation and stabilize the cathode electrolyte interphase (CEI), thereby enhancing the overall stability and performance of the battery

3. Insights into Phase Transition Mechanisms:
Through ex-situ X-ray diffraction (XRD) and nuclear magnetic resonance (NMR) analyses, the study provides insights into how Li-1FB influences phase transitions within different space groups (Fd3‾mFd3m and P4332P43​32) of LNMO. These findings help in understanding the structural dynamics during charging and discharging processes, which are crucial for optimizing battery materials


主要貢獻

1. 開發新型鹽添加劑：
本研究引入鋰1-氟苯并咪唑（Li-1FB）作為高壓尖晶石LiNi0.5Mn1.5O4LiNi0.5​Mn1.5​O4​（LNMO）正極的新型電解質添加劑。該添加劑旨在通過延遲中間相轉變和防止錳溶解來提高電化學性能，這是LNMO正極常見的問題

2. 提高電化學穩定性：
研究表明，Li-1FB可以顯著改善LNMO正極在半電池和全電池配置中的循環性能。這種改善歸因於該添加劑能抑制氟化氫的形成並穩定正極電解質界面（CEI），從而增強電池的整體穩定性和性能

3. 相轉變機制的見解：
通過異地X射線衍射（XRD）和核磁共振（NMR）分析，研究提供了Li-1FB如何影響LNMO不同空間群（Fd3‾mFd3m 和 P4332P43​32）內部相轉變的見解。這些發現有助於理解充放電過程中的結構動力學，對優化電池材料至關重要