Asphalt-Coated Graphite for Enhanced Performance of Lithium-Ion Battery Anodes

Lithium-ion batteries, known for their efficiency and lightweight energy storage capabilities, have found widespread use in mobile devices, electric vehicles, renewable energy storage, and other fields. Among these applications, the performance and cycle life of lithium-ion battery anode materials play a crucial role. This article explores the application of graphite powder coated with asphalt in lithium-ion battery anodes, and how it effectively enhances the tap density of the anode material, thereby further improving the charge-discharge efficiency and capacity of lithium-ion batteries.

Asphalt-coated graphite powder is a modified anode material that offers the following advantages:

★ Improved Electron Conductivity: Graphite exhibits excellent electron conductivity, and asphalt coating fills the micropores and cracks between graphite particles, enhancing overall electron conductivity. This reduction in resistance contributes to improved battery discharge efficiency.

★ Suppression of Solid Electrolyte Interphase Formation: During the cycling of lithium-ion batteries, the formation of a solid electrolyte interface can lead to capacity loss. Asphalt coating reduces direct contact between the electrolyte and graphite, inhibiting the formation of a solid electrolyte interface and enhancing battery cycle stability.

★ Enhanced Mechanical Stability: The protective layer formed by asphalt coating enhances the mechanical stability of graphite particles, reducing particle fracturing and detachment during cycling, thereby extending battery lifespan.

The use of asphalt-coated graphite powder in lithium-ion battery anodes can effectively increase tap density, resulting in the following performance improvements:

★ Improved Ion Transport: Higher tap density creates more pathways for ion transport within the battery, reducing ion diffusion distance and consequently enhancing charge-discharge rates and cycling performance of the battery.