The invention belongs to the technical field of battery anode materials and in particular relates to a carbon-based composite material and a lithium ion battery. The carbon-based composite material ofthe invention comprises two-dimensional layered graphite carbon nitride and carbon coated with the two-dimensional layered graphite carbon nitride. The carbon-based composite material is obtained bythe in-situ pyrolytic reaction of the two-dimensional layered graphite carbon nitride and a carbon-containing organic matter or by the chemical vapor deposition of carbon on the surface of the two-dimensional layered graphite carbon nitride. The carbon-based composite material has a porous structure, high specific surface area, and good conductivity. The carbon on the surface of the two-dimensional layered graphite carbon nitride has a connection and support effect on g-C3N4, and can alleviate volume expansion. the carbon-based composite material, as a negative electrode material of a lithiumion battery, can increase the electrode/electrolyte contact area, shortens the lithium ion diffusion distance, thereby promoting the addition of lithium ions and improving the lithium storage capacity. Thus, the lithium ion battery has high specific capacity, fast charge-discharge speed, a long cycle life.

Carbon-based composite material and lithium ion battery

The invention belongs to the field of composite materials and application, and particularly relates to a carbon/carbon-nitrogen (CxNy) composite nanotube composite material, and a preparation method and application thereof. The composite material of the present invention is composed of an inner layer of carbon-nitrogen (CxNy) nanotubes and carbon nanotubes coating the inner layer material, and theinner layer of carbon-nitrogen nanotubes and the outer layer of carbon nanotubes are combined via Van der Waals' force. The composite material of the invention has good light absorption capability and can efficiently capture solar energy, so the composite material can be used in the field of photocatalysis. At the same time, carbon nanotubes have high-efficiency selective penetration for protons,allows only protons to pass through the outer layer of carbon nanotubes to move to the carbon-nitrogen material under the action of electrostatical attraction, and inhibits detachment of newly generated H2 and entering of molecules such as OH and O , thereby achieving safe hydrogen storage, and thus the composite material is also suitable for hydrogen storage.

Carbon/carbon-nitrogen (CxNy) composite nanotube composite material, and preparation method and application thereof

The invention provides a preparation method of a black lithium titanate material for a lithium ion battery negative electrode, and the method comprises the following steps: mixing and grinding one ofNaBH4 and CaH2 and white Li4Ti5O12 powder to obtain mixed powder; and calcining the mixed powder under a protective atmosphere condition to obtain the black lithium titanate. According to the invention, a simple and convenient method for modifying the conductivity of the Li4Ti5O12 material by using a strategy of introducing lattice oxygen vacancies is adopted. By the method, the black Li4Ti5O12 material in a defect state is obtained; impurity elements are not introduced on the premise of guaranteeing the integrity of crystal lattices, the conductivity of the material is effectively improved, the internal resistance value of a battery is reduced, and the black Li4Ti5O12 material shows higher specific capacity and better cycle performance than traditional white Li4Ti5O12 under the conditionof high-rate charging and discharging.

Black lithium titanate material for lithium ion battery negative electrode as well as preparation method and application thereof

The invention provides a carbon-coated bimetallic olivine phase lithium cobalt manganese phosphate material, a preparation method and application thereof. The carbon-coated bimetallic olivine phase lithium cobalt manganese phosphate nano material provided by the invention comprises bimetallic olivine phase lithium cobalt manganese phosphate nano particles and a carbon coating layer coating the surfaces of the nano particles. The bimetallic olivine phase lithium cobalt manganese phosphate nano particles have a structure shown as a formula (1), namely LiCo0.75Mn0.25PO4. According to the nano material provided by the invention, the core particles, i.e. bimetallic olivine phase lithium cobalt manganese phosphate nano particles have a structure shown as formula (1), has an olivine phase configuration, and is coated with the carbon coating layer, so that the material can be used as a catalyst for electrocatalytic oxygen evolution reaction, and the electrocatalytic oxygen evolution activity is improved. Meanwhile, the preparation method provided by the invention enables the crystalline phase of the product to be pure, reduces the particle size, and improves the particle uniformity.

Carbon-coated bimetallic olivine phase lithium cobalt manganese phosphate material, preparation method and application thereof

The invention belongs to the field of composite materials, and in particular relates to a carbon quantum dot embedded g-C3N composite material as well as a preparation method and application of the carbon quantum dot embedded g-C3N composite material. The carbon quantum dot embedded g-C3N composite material provided by the invention comprises a single-layer two-dimensional material g-C3N and carbon quantum dots bonded to one side of the single-layer two-dimensional material g-C3N by Van der Waals force. The composite material provided by the invention has good light absorption capability in the ultraviolet, visible and partial near-infrared light ranges of solar energy, and can efficiently collect solar energy, so that the composite material is suitable in the field of photocatalysis; andhigh-efficient selective permeability of the g-C3N is utilized, the composite material provided by the invention allows protons to penetrate the g-C3N to participate in a reaction to generate hydrogen, the generated hydrogen cannot penetrate the g-C3N to escape, and meanwhile the g-C3N blocks OH and O2 from entering the system to inhibit occurrence of reverse reactions, so that effective purification and safe storage of the hydrogen are realized, and the composite material is also suitable in the field of hydrogen storage.

Carbon quantum dot embedded g-C3N composite material as well as preparation method and application of carbon quantum dot embedded g-C3N composite material

The invention discloses a two-dimensional carbon-nitrogen-based compound photocatalyst and a preparation method and an application thereof and relates to the technical field of photocatalytic materials. The two-dimensional carbon-nitrogen-based compound photocatalyst is prepared by loading transitional metal elements onto the surface of two-dimensional carbon-nitrogen materials. The prepared two-dimensional carbon-nitrogen-based compound photocatalyst can reduce band gap to form a Z-scheme system, of which the valence-band maximum is lower than oxidation potential of water and the conduction band minimum higher than reduction potential of water. According to the two-dimensional carbon-nitrogen-based compound photocatalyst, electrons can be effectively transferred inside the Z-scheme systemcomposed of the two-dimensional carbon-nitrogen-based compound photocatalyst; the two-dimensional carbon-nitrogen-based compound photocatalyst ensures hydrogen production and oxygen production on tworeaction sites simultaneously; due to the fact that the band gap of the two-dimensional carbon-nitrogen-based compound photocatalyst is reduced after loading the transitional metal ions, so that thetwo-dimensional carbon-nitrogen-based compound photocatalyst can make effective use of the light energy within the visible light range and solve the problem of interfacial transfer difficulty of existing reaction electrons.

Two-dimensional carbon-nitrogen-based compound photocatalyst and preparation method and application thereof

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