Graphene catalyst applied to improve ionic conductivity of lithium polymer battery

Abstract

The invention discloses a graphene catalyst applied to improve ionic conductivity of a lithium polymer battery. The graphene catalyst is prepared by the following steps of: (1) material selection, (2) preparation of diamine POSS (polyhedral oligomeric silsesquioxane), (3) preparation of octaphenyl POSS, (4) preparation of graphite oxide and (5) preparation of the graphene catalyst. The catalyst effectively improves the capacity of the battery and a working platform, can effectively avoid passivation of Li ions on an electrode to form an oxide, and prolongs a service life of the battery; the internal resistance is reduced greatly, so that an internal heating phenomenon of the battery is reduced; when a problem appears in the battery, the problem can be embodied timely and appears as ballooning without explosion; the safety and stability of the battery are improved; and at the same time, the graphene catalyst has excellent performances such as superconductivity, mechanical properties and heat resistance.

Description

technical field [0001] The invention relates to the technical field of carbon materials, in particular to a graphene catalyst applied to improve the ion conductivity of lithium polymer batteries. Background technique [0002] Graphene is a two-dimensional crystal that is exfoliated from graphite material and composed of carbon atoms with only one layer of atomic thickness. In 2004, Andre Geim and Konstantin Novoselov, physicists at the University of Manchester, successfully separated graphene from graphite and confirmed that it can exist alone. Bell Prize in Physics. Graphene is both the thinnest material and the strongest, with a breaking strength 200 times stronger than the best steel. At the same time, it has good elasticity, and the stretching range can reach 20% of its own size. It is currently the thinnest and strongest material in nature. If a piece of graphene with an area of ​​1 square meter is used to make a hammock, it can bear a cat weighing one kilogram with ...

AI Technical Summary

Problems solved by technology

However, the ion conductivity and mechanical strength of current lithium polymer batteries are relatively poor, the manufacturing process is complex, the battery volume is large, and the battery capacity is not enough. Since the positive active material and negative active material are easy to fall off, the ion conductivity and The electrochemical stability is poor, the strength and stability of the separator will change with the use of the battery, it is easy to cause the lithium polymer battery to age after long-term use, and the life of charge and discharge is greatly limited