Surfactant-assisted graphene three-dimensional network modified lithium iron (II) phosphate positive electrode material and preparation method thereof

• Main Authors: GUO SHOUWU, WU HAIXIA, HE SHUJUN, DAI ZHUJUN, WANG CHUNYU
• Format: Patent
• Language: Chinese; English
• Published: 16.07.2014
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a surfactant-assisted graphene three-dimensional network modified lithium iron (II) phosphate positive electrode material and a preparation method thereof. According to the present invention, a dispersion effect of a surfactant is adopted, lithium iron (II) phosphate is mono-dispersed in a graphene or graphene oxide solution, stirring and ultrasonic treatment are performed to uniformly mix, filtering and drying are performed to obtain a graphene/graphene oxide composite lithium iron (II) phosphate material, thermal reduction is performed under a protective atmosphere condition, and high temperature annealing is performed to finally obtain the graphene three-dimensional network modified lithium iron (II) phosphate positive electrode material; and the process is simple and is easy to perform, and is easily combined with the existing positive electrode material production line, the obtained product can be adopted as the positive electrode active material so as to provide excellent rate p