Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE This figure demonstrates how incorporating K2C2O4 as a functional additive into the PVDF electrolyte enhances lithium metal battery performance. The unmodified PVDF layer promotes uneven lithium deposition and dendritic growth. In contrast, the K2C2O4-modified electrolyte establishes a stable electrode interface, effectively suppressing dendrites and ensuring uniform lithium plating/stripping, thereby significantly improving cycling stability.

ABSTRACT
Poly(vinylidene fluoride) (PVDF)-based polymer electrolytes are promising candidates for lithium-ion batteries due to their high ionic conductivity, wide electrochemical stability window, and ease of processing. However, PVDF chain scission during cycling often leads to battery failure. This study introduces a straightforward strategy for modifying PVDF using potassium oxalate (K2C2O4). The resulting composite gel polymer electrolyte (CGPEK-X) facilitates the pre-formation of LiF, which enhances lithium-ion conductivity and promotes uniform lithium deposition. Moreover, the improved mechanical integrity of the composite effectively suppresses lithium dendrite growth. When integrated into LiFePO4/Li cells, the optimized K2C2O4-doped system demonstrates stable cycling over 200 cycles at room temperature, achieving a discharge capacity of 120.3 mAh g−1 at 1°C. This work presents a novel approach to engineering PVDF-based electrolytes with balanced mechanical and electrochemical properties, offering valuable insights for the development of high-performance lithium-polymer batteries.