Lithium ion battery negative electrode material and method for preparing membrane electrode thereof

• Main Authors: HE FAN, LIU BINHONG, LI ZHOUPENG
• Format: Patent
• Language: English
• Published: 06.05.2015
• Subjects: BASIC ELECTRIC ELEMENTS; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention relates to battery negative electrode materials and aims at providing a lithium ion battery negative electrode material and a method for preparing a membrane electrode thereof. The method comprises the following steps: sequentially adding LiOH solution and pyrrole solution into a water-soluble carbon source material, stirring, reacting, and performing spray drying in air, thereby obtaining a precursor; and respectively calcining under the conditions of 200 DEG C, 600 DEG C and 900 DEG C in the argon atmosphere for 2 hours, thereby obtaining nitrogen-containing porous carbon material loaded Li2C2 powder. The product has the advantages of good thermal stability and high conductivity, so that the electrochemical dynamic performance of the negative electrode is improved, the electrode polarization is reduced, the speed capacity of a lithium battery is improved, and the cathode potential is flat. According to a thin-layer structure of the membrane electrode, the transmission distance of the lithium ion is greatly shortened, high current discharge is promoted, the nitrogen-containing porous carbon material has high conductivity and contains rich nucleophilic center, metal lithium dendrites during high current discharge can be avoided, the safety of the lithium ion battery is improved, and the product can be applied to an electric automobile to serve as a power battery.