Ramar Vishwanathan, Pszolla Christian, Weinberger Manuel, Borck Markus, Zinck Laurent
Innolith Technology AG, Hirzbodenweg 95, 4052, Basel, Switzerland.
ChemSusChem. 2025 Jan 14;18(2):e202400122. doi: 10.1002/cssc.202400122. Epub 2024 Sep 25.
We unveil the fundamental insights of electrochemical kinetics of LFP cathode material and the passivation layer formation in the SO-based non-flammable inorganic liquid electrolyte (IE). The influence of temperature and electrochemical potential cutoff in the electrochemical activity of LFP cathode and IE is disclosed. Furthermore, the materials compatibility, structural and chemical stability of LFP in IE is demonstrated using very slow galvanostatic cycling in combination with LiFePO4||LiFePO symmetric cells. The lithium storage performance of LFP half-cell using inorganic electrolyte is presented with the optimum voltage window. LFP half-cells exhibit discharge capacities of 147, 111, and 75 mAh/g at 1, 4, 8 C rates, respectively, with coulombic efficiencies of ~99.98 %. The electrochemical behavior and mechanism of LFP||Graphite cell in IE is investigated while concurrently tracking the electrochemical potentials of LFP and Graphite half-cell.
我们揭示了磷酸铁锂（LFP）正极材料的电化学动力学以及基于亚砜（SO）的不可燃无机液体电解质（IE）中钝化层形成的基本见解。揭示了温度和电化学势截止对LFP正极和IE电化学活性的影响。此外，通过结合使用LiFePO4||LiFePO对称电池进行非常缓慢的恒电流循环，证明了LFP在IE中的材料兼容性、结构和化学稳定性。给出了使用无机电解质的LFP半电池在最佳电压窗口下的储锂性能。LFP半电池在1C、4C、8C倍率下的放电容量分别为147、111和75 mAh/g，库仑效率约为99.98%。研究了IE中LFP||石墨电池的电化学行为和机理，同时跟踪LFP和石墨半电池的电化学势。
