Vanadium Selenide Carbon Cellulose Composite for Battery Electrodes

The patent creates a composite material consisting of vanadium diselenide (VSe2) nanosheets combined with conductive carbon materials (such as reduced graphene oxide or carbon nanotubes). This composite structure leverages the electrochemical activity of VSe2 while the carbon component provides conductivity pathways and prevents restacking, thereby resolving the contradiction between achieving moderate potassium-embedded voltage with good safety and maintaining capacity retention through improved conductivity and structural stability.

The patent employs thin film structures where VSe2 nanosheets are dispersed and stabilized within a carbon matrix. The carbon component acts as a flexible conductive network that maintains electrical contact between VSe2 particles during cycling, preventing restacking and capacity fade while preserving the electrochemical benefits of VSe2.

The patent constructs a composite where VSe2 nanosheets are embedded in a robust carbon framework. The carbon component provides structural integrity and prevents agglomeration of VSe2 particles during the volume expansion and contraction that occurs during potassium ion insertion and extraction. This maintains both the high specific capability of VSe2 and the structural stability needed to prevent degradation.

The patent creates a heterogeneous structure where VSe2 nanosheets provide localized high-capacity regions while the carbon matrix provides distributed structural support and conductivity throughout the electrode. This local quality differentiation allows the VSe2 to deliver high specific capability while the carbon network maintains overall structural integrity during cycling.