Method for manufacturing novel lithium iron battery

Abstract

The invention relates to a method for manufacturing a novel lithium iron battery. The novel lithium iron lithium ion battery is manufactured by combining an anode active substance made of a FeF3/V2O5 composite material and LiMn2O4 with a carbon cathode, wherein the anode active substance is prepared by ballmilling 5 to 85 mass percent of LiMn2O4 and 95 to 15 mass percent of FeF3/V2O5 composite material for 1 and 8 hours; before the anode active substance is prepared, the FeF3/V2O5 composite material is prepared first, namely V2O5 accounting for 1 to 50 percent of the total mass of the composite material and FeF3 accounting for 99 to 50 percent of the total mass of the composite material are subjected to high-energy ball mill for 1 to 8 hours and the ground V2O5 and FeF3 are annealed at the temperature of between 100 and 600 DEG C for 1 to 12 hours to form the FeF3/V2O5 composite material. The method has the advantages of improving the conductivity of the material, prolonging the service life of the battery, improving a discharging platform substantially and enhancing the large-current discharging capacity of the battery, along with high safety performance of the battery.

Description

Technical field: [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a novel method for preparing lithium iron batteries. Background technique: [0002] (1) As the economy continues to develop, it will inevitably lead to the depletion of petroleum resources, environmental pollution, and the intensification of the greenhouse effect. People must grasp the economic growth (Economic growth), environmental protection (Environment protection) and energy supply (Energy security). The balance between the three E". The needs of the times call for the development of efficient and clean energy. [0003] With the development of high technology and the improvement of people's living standards, the advancement of lithium-ion battery manufacturing technology and the decline of battery costs, lithium-ion batteries will become the mainstream of chemical power sources, and their application prospects are very broad. Since its introduction into...

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Problems solved by technology

But due to LiNiO 2 Synthesis is difficult, and it is difficult to obtain stoichiometric LiNiO 2 , and its electrochemical activity is poor, and its cycle performance is also poor, which is far from practical application

[0008] Compared with nickel and cobalt, lithium manganese oxide has the advantages of low price and abundant resources. At present, there are spinel lithium manganese oxide and layered lithium manganese oxide, which have physical properties unmatched by other positive electrode materials. And chemical properties, its thermal safety and overcharge resistance are excellent, but LiMn 2 o 4 During use, the dissolution of Mn can easily lead to defects in the crystal lattice, which makes the crystal structure disordered and blocks the intercalation and deintercalation channels of lithium ions, resulting in a rapid capacity decay of the material.

Especially at high temperature (above 45°C), the cycle performance drops sharply and the storage performance is poor, which limits its wide application.

[0009] Olivine LiFePO 4 The theoretical capacity is 170mAh / g, thermal stability, safety and cycle life are good, but there are two defects: ①The electronic conductance is very small, which is not conducive to reversible reactions, especially high-rate discharge; ②Li + Diffusion in which is slow

However, the experimental research found that the conductivity, battery life and discharge platform of the material need to be further improved.

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