▎ 摘　　要

NOVELTY - The preparation method of a nano spiral graphite fiber material involves: using methane as a raw material, adding a metal catalyst, and adopting a vapor deposition method to prepare the nano spiral fiber; carbonizing the nano spiral fiber for 0.5 hour at 1000-1773K in an inert atmosphere; and graphitizing the carbonized nano spiral fiber for 0.5 hour under the protection of high-purity argon at 2000-3273K. USE - Preparation method of a nano spiral graphite fiber material used in portable electronic equipment and electric automobiles. Can also be used in automobile manufacturing, bridge building, cultural and sports entertainment products. ADVANTAGE - The preparation method takes methane gas as a precursor, prepares the nano spiral fiber by adopting a vapor deposition process, and prepares the nano spiral graphite fiber by sequentially carrying out a carbonization process and a graphitization process, and the nano spiral graphite fiber has good conductivity, is beneficial to the rapid transportation of lithium ions, and can also be used as a functional material of a conductive additive. The prepared nano spiral graphite fiber carbon layer is of a fold stack structure, is more beneficial to ion storage, and has good lithium storage performance and cycle stability. The prepared nano spiral graphite fiber has good electrical conductivity, thermal conductivity, acid resistance, alkali resistance and corrosion resistance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) the nano spiral graphite fiber material; (2) use application of the nano spiral graphite fiber material in preparing lithium-ion battery negative electrode materials or conductive additive materials. DESCRIPTION OF DRAWING(S) - The drawing shows a scanning electron microscope image of a nano spiral graphite fiber.