Graphene power battery with excellent performance and preparation method thereof

A power battery and graphene technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve problems such as poor conductivity of lithium iron phosphate, decreased conductivity of positive and negative electrodes, and poor permeability of electrolyte

Active Publication Date: 2017-06-16
中昕(福建)石墨烯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A graphene ultra-low temperature fast charging power lithium battery, wherein, positive electrode active material: 3.6Kg lithium iron phosphate, 50g porous graphene powder, 2.2Kg nano boron nitride, positive electrode conductive agent: 20g graphene, 50 polyaniline, 180g Conductive agent SP, positive electrode binder: 4.8Kg of nitrogen-methylpyrrolidone solution of polyvinylidene fluoride with a solid content of 5%; negative electrode active material: 8.6Kg lithium titanate, 35g graphene powder, 55g nano-silicon, negative electrode conductive Agent: 340g conductive agent KS-6, negative electrode binder: 7.5Kg of nitrogen methyl pyrrolidone solution of polyvinylidene fluoride with a solid content of 5%. The preparation method of the battery comprises the following steps:

[0032]1) Preparation of positive electrode sheet: first prepare 4.8Kg of nitrogen methylpyrrolidone solution of polyvinylidene fluoride with a solid content of 5%, add 20g of graphene, 50g of polyanilin...

Embodiment 2

[0041] A graphene ultra-low temperature fast charging power lithium battery, wherein, positive electrode active material: 4.5Kg lithium iron phosphate, 55g porous graphene powder, 2.0Kg nano boron nitride, positive electrode conductive agent: 25g graphene, 55 polyaniline, 170g Conductive agent SP, positive electrode binder: 4.8Kg of nitrogen-methylpyrrolidone solution of polyvinylidene fluoride with a solid content of 5%; negative electrode active material: 8.8Kg lithium titanate, 40g graphene powder, 46g nano-silicon, negative electrode conductive Agent: 330g conductive agent KS-6, negative electrode binder: 7.5Kg of nitrogen methyl pyrrolidone solution of polyvinylidene fluoride with a solid content of 5%. The preparation method of the battery comprises the following steps:

[0042] 1) Preparation of positive electrode sheet: first prepare 4.8Kg of nitrogen-methylpyrrolidone solution of polyvinylidene fluoride with a solid content of 5%, add 25g of graphene, 55 polyaniline a...

Embodiment 3

[0051] A graphene ultra-low temperature fast charging power lithium battery, wherein, positive electrode active material: 4.5Kg lithium iron phosphate, 55g porous graphene powder, 2.0Kg nano boron nitride, positive electrode conductive agent: 25g graphene, 55 polyaniline, 170g Conductive agent SP, positive electrode binder: 4.8Kg of nitrogen-methylpyrrolidone solution of polyvinylidene fluoride with a solid content of 5%; negative electrode active material: 8.2Kg lithium titanate, 40g graphene powder, 46g nano-silicon, negative electrode conductive Agent: 100g superconducting carbon black, 500g flake graphite and 330g conductive agent KS-6, negative electrode binder: 7.5Kg of nitrogen methyl pyrrolidone solution of polyvinylidene fluoride with a solid content of 5%. The preparation method of the battery comprises the following steps:

[0052] 1) Preparation of positive electrode sheet: first prepare 4.8Kg of nitrogen-methylpyrrolidone solution of polyvinylidene fluoride with a...

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525H01M10/058
CPCH01M4/5825H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 谢智全陈敏
Owner 中昕(福建)石墨烯科技有限公司
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