A lithium battery negative electrode material co 3 o 4 Preparation method of nanofiber

Abstract

The invention discloses a lithium battery negative electrode material Co 3 o 4 The preparation method of nanofiber, the present invention uses trimethoprim (C 14 h 18 N 4 o 3 ) organic ligands, cobalt acetate tetrahydrate as the main raw materials, Co prepared by electrospinning and temperature-controlled sintering technology 3 o 4 Nanofibers, coated with a layer of carbon on the surface of cobalt trioxide nanocarbon fibers, improved the metal oxide in Li + The shortcomings of large volume expansion coefficient and poor conductivity during the deintercalation process have high reversible capacity; nanofibers have a quantum size effect, which increases the contact area between the material and the electrolyte, which is Li + Provides more active sites and shortens the Li + The transmission path improves the Li during the charging and discharging process + Deintercalation rate, stable structure, good reversible performance, high specific capacity, simple operation, low cost and low equipment investment in the whole preparation process, suitable for mass production.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a lithium battery negative electrode material Co 3 o 4 Preparation methods of nanofibers. Background technique [0002] Lithium-ion batteries (LIBs) are a promising battery with light weight, high energy density, long cycle life, wide operating temperature range, no memory effect, and environmental friendliness. It has become an important direction for the development of secondary batteries and is widely used in electronic products, electric vehicles, military aerospace and other fields. The theoretical specific capacitance of graphite anode materials for traditional lithium batteries is 372 mAh g -1 (Chemical Communications, 2012, 48, 1201-1217), its theoretical specific capacity is low, and the reaction kinetics is poor. When discharged to a lower voltage, lithium dendrites will be generated, and the lithium dendrites will break to form dead lithium, thereby form...

AI Technical Summary

Problems solved by technology

However, Co 3 o 4 As a lithium battery anode material, the conductivity is poor, and the cycle durability is poor, and the capacity decays sharply after many cycles, which largely hinders the Co 3 o 4 Practical applications of anode materials

This is mainly due to the volume expansion of the electrode material during the battery cycle, which causes the battery material to pulverize and fall off the current collector, eventually causing permanent damage to the electrode.

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