The invention provides an electrostatic-spinning Co/N doped porous carbon nano-composite fiber, and preparation and application thereof The electrostatic-spinning Co/N doped porous carbon nano-composite fiber is prepared by growing polydopamine on electrostatic-spinning porous fibers in situ through in-situ polymerization; adhering cobalt ions on the surface of the fiber through impregnation; andperforming high temperature carbonization and performing blend sublimation with sulfur The fiber has stable chemical property, good electric-conductivity and great mechanical property, is controllable in appearance, has high porosity and large specific surface area, is an excellent electrode material for a lithium-sulfur batter, can improve conductivity of a sulfur positive electrode, buffer volume change and effectively inhibit shuttle effect, accelerates the redox reaction kinetics of polysulfides, and significantly improves the electrochemical performances thereof

Electrostatic-spinning Co/N doped porous carbon nano-composite fiber, and preparation and application thereof

The invention provides composite nano-fibers for nitrogen-doped porous carbon coated silicon nano-particles and preparation. The composite nano-fibers for the nitrogen-doped porous carbon coated silicon nano-particles is characterized in that the preparation method of the composite nano-fibers comprises the following steps: preparing silicon nano-particles/polyvinylpyrrolidone/polymethylmethacrylate composite nano-fibers by adopting an electrostatic spinning method; coating polypyrrole through in-situ polymerization; then, obtaining the composite nano-fibers for the nitrogen-doped porous carbon coated silicon nano-particles through a carbonizing process. The composite material prepared by the method provided by the invention has the characteristic of controllable shapes; silicon nano-particles are uniformly coated with polypyrrole-derived nitrogen-doped porous carbon materials, so that the problem of silicon aggregation is solved, and an influence caused by the change of silicon volumeis reduced; and the composite nano-fibers have the advantages of high specific surface area, high porosity, good electrical conductivity, stable physicochemical property and the like.

Composite nano-fibers for nitrogen-doped porous carbon coated silicon nano-particles and preparation

The invention provides a tin-phosphide composite material and a preparation method and application thereof. The preparation method comprises the following steps: performing the hydrothermal reaction of a tin source material and a carbon source material under an alkaline condition to obtain a hollow tin dioxide ball with carbon sources attached to the surface; carrying out carbonization treatment of the tin dioxide in an inert atmosphere to obtain a hollow tin dioxide sphere coated with a carbon layer on the surface; and heating the hollow tin dioxide sphere coated with the carbon layer on thesurface and a phosphorus source material in an inert atmosphere to react, so as to obtain the composite material containing tin phosphide, hollow tin dioxide, carbon and carbon as a coating layer. Thematerial obtained by the preparation method of the tin-phosphide composite material contains tin phosphide, hollow tin dioxide and carbon, and the carbon is a coating layer, so that the tin phosphidecomposite material has good electrical conductivity, can effectively inhibit the volume expansion effect and improve the electrochemical performance of the battery when being used as a negative electrode active material of the battery, and the preparation method is simple in condition, low in requirement on equipment and suitable for large-scale production.

Tin-phosphide composite material and preparation method and application thereof

The invention discloses a nitrogen-doped carbon-coated silicon nanoparticle composite material and a preparation method thereof. The preparation method comprises the following steps that: S1: puttinga silicon nanoparticle of which the grain diameter is 30-50nm in Tris-HCl buffer solution of which the pH (Potential of Hydrogen) is 7.5, cleaning, and drying to obtain processed silicon nanoparticles; S2: adding dopamine hydrochloride into Tris-HCl buffer solution of which the pH is 8.5, and dissolving to obtain dopamine solution; S3: adding the silicon nanoparticle processed in S1 into the dopamine solution obtained in S2, evenly dispersing, carrying out stirring reaction at the room temperature for 1-8 days, and carrying out separation and drying to obtain reactant; and S4: under an inert atmosphere, calcinating the reactant obtained in S3 at a temperature of 700-900DEG C for 1-2h to obtain a composite material. The invention also discloses the application of the above composite material on a lithium battery negative electrode. The composite material synthesized by the preparation method has excellent cycling stability.

Nitrogen-doped carbon-coated silicon nanoparticle composite material, preparation method and application

The invention discloses an alpha-MoO3-x nanobelt and a preparation method thereof as well as an electrode material and an energy storage device. The preparation method of the alpha-MoO3-x nanobelt comprises the following steps: taking molybdenum powder and dissolving the molybdenum powder in a hydrogen peroxide solution, adding a reducing agent, sufficiently mixing, transferring the obtained mixture into a reaction kettle for reacting to prepare the alpha-MoO3-x nanobelt. The prepared alpha-MoO3-x nanobelt has abundant and uniformly-distributed oxygen vacancies, and is extremely excellent in morphology and excellent in conductivity; and the alpha-MoO3-x nanobelt can be prepared into the electrode material with extremely excellent electrochemical properties such as capacity, rate performance and cycling performance, so that the electrochemical properties of the energy storage device can be improved.

Alpha-MoO3-x nanobelt and preparation method thereof as well as electrode material and energy storage device

The invention discloses a preparation method of a nitrogen-doped ordered porous carbon coated silicon nanometer composite material. The preparation method comprises the following steps: firstly adopting dopamine hydrochloride coated silicon nanometer particles, then using cobaltous acetate for catalysis treatment, and finally carrying out high-temperature calcinations to obtain the target product. The preparation method of the composite material disclosed by the invention is simple, the obtained product is good in cycle stability and cycle specific capacity, and the composite material can serve as an excellent negative electrode material for lithium ion batteries.

Preparation method of nitrogen-doped ordered porous carbon coated silicon nanometer composite material

The invention discloses a preparation method of a mesoporous carbon nanotube coated Sn4P3 nanometer particle sodium ion battery negative electrode material The material is obtained by using mesoporous carbon coated SnO2 and sodium hypophosphite as raw materials through heating phosphorization reaction The material has high specific surface area and good conductivity; in addition, due to the existence of Sn4P3 nanometer particles, when the Sn4P3@mC is used as the sodium ion battery negative electrode material, the obtained battery material has good circulation stability and high circulation specific capacity; the battery performance is excellent; the preparation method of a product is simple; the yield is high; the used raw materials are cheap and can be easily obtained; the commercial application is facilitated

Preparation method of mesoporous carbon nanotube coated Sn4P3 nanometer particle sodium ion battery negative electrode material

The invention discloses a nanometer flower-shaped molybdenum oxide lithium ion battery negative electrode material and a preparation method thereof. A MoO3-x material used as a lithium ion battery negative electrode material is in a nanometer flower shape, wherein x is greater than 0 but is smaller than 1; the material is prepared and obtained by using oxalic acid and molybdenum trioxide as raw materials by a hydrothermal method. Nanometer flower-shaped molybdenum oxide is used as the lithium ion battery negative electrode material; the specific surface area is high; the obtained battery has high cycle stability and high cycle specific capacity; the battery performance is excellent; the product preparation method is simple; the used raw materials are cheap and can be easily obtained; the commercial application is facilitated.

Nanometer flower-shaped molybdenum oxide lithium ion battery negative electrode material and preparation method thereof

The invention discloses a preparation method of a nitrogen-doped carbon-coated zinc telluride nanometer wire and application thereof serving as a sodium-ion battery negative electrode material. Firstly, a tellurium nanometer wire is synthesized by using a hydrothermal method, the tellurium nanometer wire is stirred with a silver nitrate solution at room temperature to be converted as the silver telluride nanometer wire, then silver telluride nanometer wire reacts with a zinc nitrate solution to be converted as the zinc telluride nanometer wire by using an ion exchange reaction, the zinc telluride nanometer wire is coated with dopamine hydrochloride, and the nitrogen-doped carbon-coated zinc telluride nanometer wire is obtained through high temperature calcinations under the argon or nitrogen atmosphere. The preparation method of the composite material is simple, the raw materials are cheap and easy to obtain, the obtained material has the good cycling stability and specific capacity when serving as the sodium-ion battery negative electrode, and can be taken as the excellent sodium-ion battery negative electrode material.

Preparation method of nitrogen-doped carbon-coated zinc telluride nanometer wire and application thereof serving as sodium-ion battery negative electrode material

Li Chunxiao

Papers

Preparation method of nitrogen-doped ordered porous carbon coated silicon nanometer composite material

Preparation method of mesoporous carbon nanotube coated Sn4P3 nanometer particle sodium ion battery negative electrode material

Nanometer flower-shaped molybdenum oxide lithium ion battery negative electrode material and preparation method thereof

Preparation method of nitrogen-doped carbon-coated zinc telluride nanometer wire and application thereof serving as sodium-ion battery negative electrode material