A graphene power battery with superior performance and preparation method thereof

Abstract

The invention provides a graphene power battery with superior performance and a preparation method thereof, which is composed of a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte and a casing, and the negative electrode active material is spinel lithium titanate, nano-silicon, and graphene powder body; the positive active material is lithium iron phosphate, porous graphene powder, nano-boron nitride; the positive and negative conductive agents contain graphene powder, polyaniline, SP, KS-6, carbon fiber, carbon nanotube, super At least one of conductive carbon black and flake graphite, wherein the positive electrode conductive agent contains graphene powder; the positive electrode binder and the negative electrode binder are polyvinylidene fluoride, polytetrafluoroethylene, styrene-butadiene rubber, CMC at least one. Solve the problems of poor electrical conductivity of lithium iron phosphate, a significant drop in the conductivity of the positive electrode / negative electrode, and poor permeability of the electrolyte under low-temperature conditions for lithium iron phosphate power batteries at a lower cost.

Description

technical field [0001] The invention belongs to a lithium iron phosphate power battery, in particular to a graphene power battery with superior performance and a preparation method thereof. Background technique [0002] Graphene is a flat monolayer of carbon atoms tightly packed into a two-dimensional honeycomb lattice, and is the basic building block of graphite materials in all other dimensions, which has the thinnest, largest specific surface area, hardest, most tensile, etc. Many unique properties such as the strongest properties in history, high-performance sensor functions, and catalyst-like functions. At present, there are mainly four methods for preparing graphene: micromechanical exfoliation method, vapor deposition method, epitaxial growth method, and graphite oxide reduction method. The emergence of graphene is expected to trigger a material revolution in many fields such as structural materials and functional materials for electronic devices. Due to its many sp...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the above deficiencies in the prior art, to provide a graphene ultra-low temperature fast charging power lithium battery, to improve the low-temperature discharge performance of lithium iron phosphate power battery, and to solve the problem of lithium iron phosphate power battery at a lower cost. Under low temperature conditions, lithium iron phosphate has poor conductivity, the conductivity of the positive electrode / negative electrode has dropped significantly, and the permeability of the electrolyte has deteriorated, etc.