Preparation method of titanium iron lithium battery

Abstract

The invention discloses a method for preparing a titanium-iron-lithium battery, a method for preparing a titanium-iron-lithium battery. The method prepares a titanium-silicon-carbon negative electrode slurry and a lithium iron phosphate positive electrode slurry, and then prepares the lithium iron phosphate positive electrode The slurry and the titanium-silicon-carbon negative electrode slurry are uniformly coated on the positive electrode current collector and the negative electrode current collector respectively, dried and pressed to obtain positive and negative electrode sheets, and finally assembled to obtain a titanium-iron-lithium battery; thus, the present invention uses titanium-silicon carbon as the negative electrode The material can use the "shell", "core" and "pomegranate coat" in the "shell core pomegranate structure" of titanium silicon carbon to ensure that the titanium silicon carbon negative electrode material is more stable and reliable than conventional graphite during charge and discharge, thereby further Improve the safety and reliability of the battery, prolong the cycle life of the battery, and improve the mass specific energy of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion preparation, and in particular relates to a preparation method of a titanium iron lithium battery. Background technique [0002] With the development of technology, lithium-ion batteries also have very good application prospects in the fields of electric vehicles and energy storage, which will have a profound impact on people's lives in the future. [0003] The negative electrodes of existing lithium iron phosphate batteries generally use pure graphite materials. The hexagonal layered structure of graphite materials is not conducive to maintaining the structural stability during charging and discharging; graphite is a combustible substance, which is not conducive to the control of the battery in thermal runaway Stability; at the same time, the expansion and contraction of graphite during charging and discharging lead to the failure of particle pulverization, and the cycle life of the battery m...

AI Technical Summary

Problems solved by technology

[0003] The negative electrodes of existing lithium iron phosphate batteries generally use pure graphite materials. The hexagonal layered structure of graphite materials is not conducive to maintaining the structural stability during charging and discharging; graphite is a combustible substance, which is not conducive to the control of the battery in thermal runaway Stability; at the same time, the expansion and contraction of graphite during charging and discharging lead to the failure of particle pulverization, and the cycle life of the battery made by it is relatively low, which cannot meet the needs of improving the energy density of the battery; in addition, the layered structure of graphite leads to The migration distance of medium ions is long, which makes it impossible to achieve high-rate charging, and the discharge capacity under low temperature conditions is also affected.

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