The invention discloses a preparation method of a graphene oxide/sulfur microcapsule composite material, a positive electrode of lithium-sulfur battery and the lithium-sulfur battery. The method comprises the steps: taking graphene oxide aqueous solution, an organic photocuring material solution containing a photoinitiator and a polyvinyl alcohol aqueous solution as an inner phase, an outer phaseand a driving phase; employing a liquid drive coaxial flow focusing technology, and acquiring graphene oxide microcapsules from the inner phase and the outer phase under the shearing action of the driving phase, and performing curing under the irradiation of ultraviolet light; preparing a graphene oxide/sulfur microcapsule composite material through the steps of washing, drying, high-temperature carbonization and sulfur smoking. The lithium-sulfur battery positive electrode material has good conductivity, a large amount of graphene oxide in the capsule provides a specific surface area for sulfur adsorption, the active mass of sulfur is increased, and a buffer space is provided for volume expansion of sulfur, so the electrochemical performance of a lithium-sulfur battery is improved.

Preparation method of graphene oxide/sulfur microcapsule composite material, positive electrode of lithium-sulfur battery and lithium-sulfur battery

The invention provides a graphene functional self-repairing microcapsule with a cellular structure and a preparation method thereof, aiming at the problems in a self-repairing system in the prior art,The internal repairing and external fixing graphene functional self-repairing microcapsule with the cellular structure consists of a capsule wall and a curing agent with which the capsule wall is covered, wherein graphene is dispersed in the capsule wall; a series of microcapsules of a micro-nano scale are dispersed in the curing agent to form a cellular structure; the insides of the microcapsules of the micro-nano scale are covered with a repairing agent. The self-repairing microcapsule system has a multi-core coating structure of a micro-nano scale, thereby improving the stability of the microcapsules, increasing the probability of contact between the repairing agent and the curing agent at the same time, and improving the repairing efficiency. In addition, the capsule wall of the self-repairing microcapsule system is modified by silane, an unhydrolyzed silane emulsion left after rupture of the microcapsules can form a hydrophobic film inside concrete capillary holes to prevent further diffusion of moisture, and the hydrolyzed silane emulsion can also participate in the synthesis of a wall material to improve the performance of the microcapsules.

Graphene functional self-repairing microcapsule with a cellular structure and a preparation method thereof

The invention provides an inner-repairing and outer-curing type self-repairing microcapsule with a cellular structure and a preparation method of the self-repairing microcapsule for the problem existing in a self-repairing system in the prior art. The self-repairing microcapsule comprises a capsule wall and a curing agent coated by the capsule wall, wherein a series of micro-nano microcapsules aredispersed in the curing agent, so as to form the cellular structure; a repairing agent is coated in each of the micro-nano microcapsules. The self-repairing microcapsule system has a micro-nano multinuclear coating structure, so that the stability of the microcapsule is enhanced, meanwhile, the contact probability of the repairing agent and the curing agent are increased, and the repairing efficiency is improved. Additionally, the capsule wall of the self-repairing microcapsule system is modified by silane, silane emulsion which is not hydrolysed after the microcapsule is ruptured can form ahydrophobic membrane in a capillary hole of concrete, and the water content can be prevented from being diffused further; in addition, silane emulsion which is hydrolysed can participate in the synthesis of a wall material, so that the property of the microcapsule is improved.

Inner-repairing and outer-curing type self-repairing microcapsule with cellular structure and preparation method of self-repairing microcapsule

The invention provides a silane functionalized self-repair microcapsule with a cellular structure and a preparation method of the self-repair microcapsule aiming at the problems existing in the priorart in the self-repair system. The external repairing and internal curing type self-repair microcapsule with the cellular structure comprises a capsule wall and a repair agent coated by the capsule wall, wherein a series of micro/nano level microcapsules are dispersed in the repair agent so as to form the cellular structure; and the curing agent is coated in the micro/nano level microcapsules. Theexternal repairing and internal curing type self-repair microcapsule system has a micro/nano level multi-core coating structure, so that the stability of the microcapsules is increased, the contact probability of the repair agent and the curing agent is increased, and the repair efficiency is improved. In addition, the capsule wall of the self-repair microcapsule system is modified by silane, unhydrolyzed silane emulsion can form a hydrophobic membrane in capillary holes of the concrete after microcapsule rupture, and further dispersion of moisture is inhibited. Moreover, the hydrolyzed silane emulsion can participate in synthesis of the wall material, and the performance of the microcapsule is improved.

External repairing and internal curing type self-repair microcapsule with cellular structure and preparation method of self-repair microcapsule

The invention provides a graphene functionalization self-repairing microcapsule with a cellular structure and a preparation method of the self-repairing microcapsule for the problem existing in a self-repairing system in the prior art. The outer-repairing and inner-curing type graphene functionalization self-repairing microcapsule comprises a capsule wall and a repairing agent coated by the capsule wall, wherein graphene is dispersed in the capsule wall; a series of micro-nano microcapsules are dispersed into the repairing agent, so as to form a cellular structure; a curing agent is coated ineach of the micro-nano microcapsules. The self-repairing microcapsule system has a micro-nano multinuclear coating structure, so that the stability of the microcapsule is enhanced, meanwhile, the contact probability of the repairing agent and the curing agent are increased, and the repairing efficiency is improved. Additionally, the capsule wall of the self-repairing microcapsule system is modified by silane, silane emulsion which is not hydrolysed after the microcapsule is ruptured can form a hydrophobic membrane in a capillary hole of concrete, and the water content can be prevented from being diffused further; in addition, silane emulsion which is hydrolysed can participate in the synthesis of a wall material, so that the property of the microcapsule is improved.

Outer-repairing and inner-curing type graphene functionalization self-repairing microcapsule with cellular structure and preparation method of self-repairing microcapsule

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Graphene functional self-repairing microcapsule with a cellular structure and a preparation method thereof

Inner-repairing and outer-curing type self-repairing microcapsule with cellular structure and preparation method of self-repairing microcapsule

External repairing and internal curing type self-repair microcapsule with cellular structure and preparation method of self-repair microcapsule

Outer-repairing and inner-curing type graphene functionalization self-repairing microcapsule with cellular structure and preparation method of self-repairing microcapsule