Preparation method of porous nano alpha-Fe2O3/Ag negative electrode material

Abstract

The invention discloses a preparation method of a porous nano alpha-Fe2O3 / Ag negative electrode material in the technical field of preparation of lithium batteries, raw materials comprise ferric salt, a surfactant, acetate, a solvent, a pore-forming agent and silver nitrate, firstly, the ferric salt, the surfactant, the acetate, the solvent and the pore-forming agent are mixed through a hydrothermal method to prepare porous nano alpha-Fe2O3; and depositing Ag nano particles formed by silver nitrate in pore channels of alpha-Fe2O3 through a hydrothermal method to obtain the porous nano alpha-Fe2O3 / Ag negative electrode material. Compared with the prior art, the preparation time is greatly saved, the nano-porous morphology can be obtained through the method, acetate can adjust the size of iron oxide particles and reduce the size of iron oxide, holes are formed in the roasting process after the pore forming agent is added, Ag nano-particles can be deposited into pore channels of iron oxide, the conductivity of the material is higher, and the material is more suitable for large-scale production. And the electrical performance of the lithium battery is further enhanced.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium batteries, in particular to a porous nano-α-Fe 2 o 3 The preparation method of / Ag negative electrode material. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge rate, high-voltage operation, wide operating temperature range, and no "memory effect". They are considered to be new power sources for electric vehicles, hybrid vehicles, and emerging smart networks. . The theoretical capacity of the current commercial lithium-ion battery anode material graphite is only 372mAh g -1 , unable to meet the needs of the new generation of lithium-ion batteries. Compared with graphite materials, α-Fe 2 o 3 The theoretical capacity is 1007mAh g -1 , and has the advantages of high conductivity and low cost, therefore, α-Fe 2 o 3 Considered to be one of the most promising substitutes for carbon anode materials...

AI Technical Summary

Problems solved by technology

The theoretical capacity of the current commercial lithium-ion battery anode material graphite is only 372mAh g -1 , unable to meet the needs of the new generation of lithium-ion batteries

Compared with graphite materials, α-Fe 2 o 3 The theoretical capacity is 1007mAh g -1 , and has the advantages of high conductivity and low cost, therefore, α-Fe 2 o 3 Considered to be one of the most promising substitutes for carbon anode materials, however, α-Fe 2 o 3 Huge volume changes during lithium-deintercalation can lead to pulverization of electrode materials and rapid loss of specific capacity

At present, research work mainly focuses on the preparation of nanostructured α-Fe 2 o 3 anode materials to alleviate the volume change during the process of intercalation and deintercalation of lithium, thereby improving its cycle stability, however, a single component of α-Fe 2 o 3 Agglomeration of nanostructures during cycling leads to structural damage