▎ 摘　　要

NOVELTY - Use of ethylene maleic anhydride alternating copolymer and hydrolysis product i.e. 3-ethyldihydrofuran-2,5-dione compound of formula (I) and 3-ethyldihydrofuran-2,5-dione compound of formula (II) in preparing silicon cathode material, is claimed. USE - The ethylene maleic anhydride alternating copolymer and its hydrolysis product is useful as a binder in preparing silicon cathode material and flexible silicon cathode (all claimed). ADVANTAGE - The ethylene maleic anhydride alternating copolymer and its hydrolysis product: can enhances the specific charge capacity of the electrode material; and suppress the rapid volume change of the cathode material during the charging and discharging process, and improves the cycle performance of the silicon cathode material. DETAILED DESCRIPTION - Use of ethylene maleic anhydride alternating copolymer and hydrolysis product i.e. 3-ethyldihydrofuran-2,5-dione compound of formula (I) and 3-ethyldihydrofuran-2,5-dione compound of formula (II) in preparing silicon cathode material, is claimed. n = 800-4000. INDEPENDENT CLAIMS are also included for: 1. silicon cathode material comprising 5-20 pts. wt. ethylene maleic anhydride alternating copolymer and hydrolysis product, 60-90 pts. wt. silicon-based active material, and 5-20 pts. wt. conductive agent; and 2. preparing silicon cathode electrode comprising dispersing silicon cathode electrode in a solvent, uniformly mixing, coating on a metal substrate, and drying to obtain final product; and 3. preparing flexible silicon cathode comprising dispersing silicon cathode electrode material in an organic solvent, mixing evenly, pouring into a mold, and drying to obtain flexible silicon cathode, the conductive agent is a carbon nanotube.