Preparation method of graphene lithium battery with good environmental protection performance

Abstract

The invention discloses a preparation method of a graphene lithium battery with good environmental protection performance. The preparation method comprises following steps of S1, preparing a graphenelithium battery positive electrode material, namely, mixing graphene powder and N-methyl pyrrolidone according to a certain mass ratio, ultrasonically dispersing, transferring into a reactor, introducing nitrogen to increase the pressure, and then slowly relieving the pressure to normal pressure to obtain a mixture A1; weighing raw materials including lithium carbonate, nickel carbonate, manganesecarbonate, ferric acetate and cobalt oxide according to a certain proportion, putting the raw materials into a stirrer for stirring, and putting the uniformly mixed raw materials into a stirring typeball mill for mechanical activation to obtain a mixture A2; and introducing the mixture A1 and the mixture A2 into a stirrer in proportion for mixing. The raw materials can be processed, thereby being convenient for producing and assembling the raw materials into the battery, effectively solving the problem of poor conductivity of the existing lithium battery, and improving the quality of the product. In addition, the product can be quickly degraded and recycled, so that the environmental protection performance of the product is improved.

Description

technical field [0001] The invention relates to the technical field of graphene lithium battery preparation, in particular to a method for preparing a graphene lithium battery with good environmental performance. Background technique [0002] Graphene has very good thermal conductivity properties. The thermal conductivity of pure defect-free single-layer graphene is as high as 5300W / mK, which is the carbon material with the highest thermal conductivity so far, higher than single-walled carbon nanotubes (3500W / mK) and multi-walled carbon nanotubes (3000W / mK) . When it is used as a carrier, the thermal conductivity can reach 600W / mK. In addition, the ballistic thermal conductivity of graphene can lower the lower limit of the ballistic thermal conductivity of carbon nanotubes per unit circumference and length. The high thermal conductivity of graphene facilitates the release of heat generated by high current loads in battery systems. Lithium titanate battery is a kind of li...

AI Technical Summary

Problems solved by technology

However, its poor electrical conductivity is a problem we have to face. Due to its good electrical conductivity, excellent hardness and toughness, graphene can be combined with lithium titanate to form the negative electrode sheet of the battery, which can effectively increase the active material ratio of the battery material. More importantly, it can improve its cycle performance while improving the rate performance, which helps to prolong its service life and helps to improve the protection function of the environment

[0004] However, how to make good use of the conductivity of graphene to make up for the poor conductivity of lithium titanate batteries has always been a difficult problem for those skilled in the art. For this reason, we have proposed a graphene lithium battery with good environmental performance. Battery preparation method to solve the above problems

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