This invention discloses a method for preparing a 3D graphitized ultrafine
fiber conductive network self-supporting
lithium battery, relating to the field of
lithium battery
cathode material technology. This invention utilizes
electrospinning technology to prepare three-dimensional (3D)
network structure polyimide (PI) nanofibers, which, after graphitization (GPI), are used as a substrate to support the NCM811
cathode material. This method offers several advantages: First, the PI prepared by
electrospinning can form a long-range, continuous three-dimensional
electron network, facilitating
electron and
ion transfer and effectively alleviating the
volume expansion and cycle performance degradation issues of NCM811
electrode materials. Second, it eliminates the need for conductive additives and
aluminum foil current collectors, achieving a self-supporting
electrode material. Third, because the PI fibers prepared by
electrospinning have excellent flexibility, they can be used in flexible
lithium-
ion batteries, directly assembled into
energy storage and conversion devices. Therefore, combining electrospinned graphitized GPI to support NCM811 battery materials is a good strategy for improving the electrochemical performance of NCM811.