Graphene power battery with excellent performance and preparation method thereof

Abstract

The invention provides a graphene power battery with excellent performance and a preparation method thereof. The graphene power battery consists of a positive pole piece, a negative pole piece, a membrane, electrolyte and a shell, wherein a negative pole active material is prepared from spinel lithium titanate, nano silicon and graphene powder; a positive pole active material is prepared from lithium iron phosphate, porous graphene powder and nano boron nitride; each of a positive pole conductive agent and a negative pole conductive agent contains at least one of graphene powder, polyaniline, SP, KS-6, carbon fiber, carbon nano tubes, superconductive carbon black and crystalline flake graphite; the positive pole conductive agent contains the graphene powder; each of a positive pole adhesive and a negative pole adhesive is at least one of polyvinylidene fluoride, polytetrafluoroethylene, butadiene styrene rubber and CMC. The problems of low lithium iron phosphate conductivity, substantial reduction of the conductivity of a positive / negative pole, decrease of the electrolyte permeability and the like of a lithium iron phosphate power battery under a low temperature condition are solved with relatively low 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...

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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.