Preparation method for compound lithium ion battery cathode material and application of petroleum resin in preparation method

• Main Authors: LIANG YUZHENG, LEI TIEJUN
• Format: Patent
• Language: Chinese; English
• Published: 10.12.2014
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a preparation method for a compound lithium ion battery cathode material with high energy density, high-rate-capability charge and discharge performance and good cycle performance, and application of petroleum resin in the preparation method. Petroleum resin is used as a coating material of a core material, particularly as a secondary coating and modifying material. The preparation method comprises steps of liquid preparation, material adding, drying for solidification, carbonization, modification, and high-temperature processing. The preparation technology is simple, and is easy to implement; a liquid phase system is adopted, coating is even and stable, and petroleum resin is adopted as a modifier, so that the modifier and a hard carbon coating layer have good compatibility and binding force, and the specific surface area of the hard carbon coating layer is reduced. The prepared cathode material has the tap density higher than 1.0g/cm and the specific surface area of the prepared cath