The invention discloses general electronic paste based on graphene filler. The electronic paste contains graphene-containing conductive filler, an organic carrier, a solvent and an auxiliary agent. Because the graphene has good electronic conductivity and a unique two-dimensional laminar nano structure, the graphene forms a conductive network in the organic carrier more easily, and the electric conductivity of the electronic paste is improved by adding the graphene. Further, the conductive filler also contains a conductive material with relatively high electric conductivity, so that the electric conductivity of the electronic paste is further improved. Because the graphene and the conductive material are compounded to form the conductive filler, the electronic paste has good electric conductivity. The electronic paste can obtain a relatively wide electric conductivity range by changing the category of the conductive material mixed with the graphene and adjusting the relative proportion of the graphene to the conductive material of different category. The electric conductivity of the electronic paste is 1*10 S/cm to 1*10 S/cm. The paste can be widely applied, and can be particularly used as a conductive coating or adhesive.

General electronic paste based on graphene filler

A lithium salt-graphene-containing composite material and its preparation method are provided. The composite material has the microstructure which comprises carbon nanoparticles, lithium salt nanocrystals and graphene, wherein the surface of lithium salt nanocrystals is coated with carbon nanoparticles and graphene. The preparation method comprises concentrating and drying a mixed solution, then calcinating the solid. The lithium salt-graphene-containing composite material has excellent electric performance and stability since the problem of low electric performance resulted from carbon coating on the surface of lithium salt or coating imperfection resulted from graphene coating on the surface of lithium salt is effectively solved. For the more uniform and compacted combination between graphene and lithium salt nanocrystals, the graphene will not fall off and the composite material has a high capacity ratio, energy density and conductivity. Furthermore, particle agglomeration and growing up are reduced in the process of calcination. The technique of the method is simple, low cost and fit for industrialized production.

Lithium salt-graphene-containing composite material and preparation method thereof

Electrode composite material of lithium secondary battery and preparation method thereof

In order to prepare a highly conductive and highly dispersible graphene powder and to obtain an electrode for a lithium ion battery with excellent performance utilizing the highly conductive and highly dispersible graphene, a graphene powder and a preparation method thereof is provided. The graphene powder comprises a compound having a catechol group adsorbing on the surface of graphene in a weight ratio of 5-50% relative to the grapheme and the element ratio of oxygen to carbon in the graphene powder measured by X-ray photoelectron spectroscopy is 0.06 or more and 0.20 or less. The method for producing a graphene powder comprise the step of reducing a graphite oxide with a reducing agent having no catechol group in the presence of a compound having a catechol group.

Graphene powder, method for producing graphene powder and electrode for lithium ion battery containing graphene powder

The present invention provides a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, graphene layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers. A graphene coating-modified electrode plate for lithium secondary battery according to the present invention comprises a current collector foil, graphene layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers. The graphene-modified electrode plate for lithium secondary battery thus obtained increases the electrical conductivity and dissipation functions of the electrode plate due to the better electrical conductivity and thermal conductivity of graphene. The present invention further provides a method for producing a graphene coating-modified electrode plate for lithium secondary battery.

Graphene coating modified electrode plate for lithium secondary battery and method for producing the same

The invention relates to an electrode with grapheme as conductive additive and application thereof in a lithium ion battery. 1 to 30 percent of graphene active substance is added into positive pole active substance; or grapheme which is 1 to 30 percent of the active substance in percentage by weight is added into negative pole active substance. The assembled lithium ion battery is the lithium ion battery with the positive pole added with graphene conductive additive and the negative pole the same with the negative pole of the traditional industrial lithium ion battery, or the lithium ion battery the positive pole of which is the same with the positive pole of the traditional industrial lithium ion battery, and the negative pole added with the graphene conductive additive, or the lithium ion battery with the positive pole and the negative pole simultaneously added with the graphene conductive additive. The invention significantly improves the high-power charge and discharge properties as well as the charge and discharge efficiency and the cycle life of the battery; and researches have shown that the charge and discharge properties of the lithium iron phosphate of the grapheme which is 10 percent of the active substance in percentage by weight are close to or better than the charge and discharge properties of the lithium iron phosphate which contains 20 percent of conductive carbon black.

Electrode with grapheme as conductive additive and application thereof in lithium ion battery

The invention relates to the technical field of lithium ion batteries, in particular to core-shell structured carbon for a cathode material of a lithium ion battery and a preparation method thereof, and the lithium ion battery taking the core-shell structured carbon as the cathode material and a preparation method thereof The core-shell structured carbon comprises a hard carbon material serving as a 'core' and soft carbon 'shell' which is coated on the surface of the 'core' On the one hand, the hard carbon material serving as the 'core' provides a large number of spaces for storing lithium and channels for lithium ions to move, and the energy density and power density of the material are improved, and on the other hand, the soft carbon 'shell' with a graphite structure ensures that the material has high coulombic efficiency and cycle performance, so that the lithium ion battery made of the core-shell structured carbon serving as the cathode material has high capacity, high power characteristic, high cycle performance and high first charge and discharge coulombic efficiency, the preparation method is simple, and the cost is low

Core-shell structured carbon for cathode material of lithium ion battery and preparation method thereof

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Electrode with grapheme as conductive additive and application thereof in lithium ion battery

Core-shell structured carbon for cathode material of lithium ion battery and preparation method thereof