▎ 摘　　要

NOVELTY - Preparing polyacrylonitrile-based boron carbonitride nanofiber electrode material involves: (1) weighing a boron source, a carbon source and a nitrogen source for processing to obtain boron carbonitride nanopowder; (2) mixing the boron carbonitride nanopowder and a template material in N,N-dimethylformamide, and stirring to obtain a shell layer spinning solution; (3) mixing polyacrylonitrile and a pore-forming template in a solvent to obtain a core layer spinning solution; (4) coaxially electrospinning the shell layer spinning solution and the core layer spinning solution to obtain an electrode material precursor; and (5) carbonizing the electrode material precursor in a tubular furnace. USE - The method is useful for preparing polyacrylonitrile-based boron carbonitride nanofiber electrode material used in electrochemical energy storage device (all claimed). ADVANTAGE - The method: provides polyacrylonitrile-based boron carbonitride nanofiber electrode material, which has high boron carbonitride degree; and adopts boron carbonitride material, which uniformly covers the surface of the polyacrylonitrile carbon fiber, and has high stability, and porous carbon layer, which improves the conductivity of the electrode material, increases the electron transfer rate in the energy storage process, and accelerates the electron dynamics process. The electrochemical energy storage device has high energy storage performance, capacity, rate performance, and long service life.