Honeycomb zinc sulfide/carbon composite negative electrode material and preparation method thereof

• Main Authors: LI HUI, ZHENG JUNCHAO, TONG HUI, DONG PENGYUAN, CHEN HEZHANG, YU WANJING, ZHOU QIJIE, ZHANG JIAFENG, ZHANG BAO
• Format: Patent
• Language: Chinese; English
• Published: 18.08.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A honeycomb zinc sulfide/carbon composite negative electrode material is prepared according to the following method of (1) adding a sulfur source compound, a chloride and citric acid into water, performing stirring reaction to form a transparent solution, adjusting a pH value, and adding a zinc source compound to obtain a colorless and transparent solution; (2) quickly freezing the colorless and transparent solution with liquid nitrogen, and performing vacuum freezing and drying to obtain white solid powder; and (3) roasting the white solid powder in a protection atmosphere, cooling the product with a furnace, and performing washing and drying to obtain the honeycomb zinc sulfide/carbon composite negative electrode material. In the honeycomb zinc sulfide/carbon composite negative electrode material, the discharge capacity per gram reaches 1,430 mAh.g<-1> under current density of 3.0-0.01V and 100mA/g and reaches 487 mAh.g<-1> under the current density of 1.0A/g, the capacity retention ratio reaches 100.84% af