▎ 摘　　要

NOVELTY - Composite material comprises 10-20 pts. wt. polycarbonate, 8-18 pts. wt. sodium bicarbonate, 5-15 pts. wt. graphene, 4-12 pts. wt. polyester fiber, 2-8 pts. wt. nickel oxide, 2-6 pts. wt. nano sodium chloride powder, 2-8 pts. wt. nano silicon powder, 5-10 pts. wt. polyvinylpyrrolidone, 3-9 pts. wt. lithium titanate and 4-10 pts. wt. polyvinyl alcohol. USE - The material is useful for lithium battery (claimed). ADVANTAGE - The material: has simple preparation method; improves cycle performance, charging and discharging performance of the lithium battery; and reduces capacitance loss rate after multiple cycles. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing composite material, comprising (i) mixing graphene, nickel oxide, nano sodium chloride powder and nano silicon powder, then adding the obtained mixture into a ball mill, ball milling for 120-150 minutes, and sieving through 80-mesh sieve to obtain mixture A, (ii) adding polycarbonate, sodium bicarbonate and polyvinyl alcohol into the mixture A, mixing, adding into a stirring kettle, stirring at low speed, and then allowing to stand for 30 minutes to obtain mixture B, (iii) adding polyvinylpyrrolidone and lithium titanate into the mixture B, mixing, adding into an ultrasonicator, and ultrasonicating for 20-40 minutes to obtain mixture C, (iv) adding polyester fiber into the mixture C, mixing, placing on water bath, and heating at 55-70 degrees C for 8-20 minutes, and then cooling to room temperature to obtain mixture D, (v) vacuum distilling the mixture D, then placing in an oven, and drying at 140-180 degrees C to obtain mixture E, and (vi) adding the mixture E into a sintering furnace, passing nitrogen gas, heating at 280-320 degrees C for 30-60 minutes, then heating at 430-520 degrees C for 20-50 minutes, and then slowly cooling to room temperature to obtain final product.