Abstract
AbstractThe electrochemical performance of conventional lithium‐ion batteries are significantly deteriorates at low temperatures, posing a significant challenge in the development of battery technology. This paper addresses this issue by focusing on the synthesis of a nitrogen‐doped porous carbon material with fast lithium‐ion diffusion and reaction kinetics at low temperatures. The material was prepared using pitch as a precursor, urea as a nitrogen source and blowing agent, and SiO2 as a template. The obtained nitrogen‐doped porous carbon material (denoted as PN‐2) displayed a specific surface area of 167.64 m2/g and approximately five microcrystalline layers when the urea addition was 20%. Notably, at low temperatures, PN‐2 demonstrated an impressive discharge specific capacity, with average values of 372, 295, 254, and 197 mAh/g at 25 °C, 0 °C, −20 °C, and −40 °C, respectively. The large specific surface area of the porous carbon material effectively increased the active sites for lithium ions, promoting rapid diffusion and improved lithium/delithium kinetics, thus enhancing the multiplicity performance at low temperatures. This research provides the valuable insights for the design of high‐performance lithium‐ion battery materials suitable for cold climate environments.
Published Version
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