Abstract: Provided are a functional coating material for a lithium ion battery separator and a preparation method therefor. The functional coating material for a lithium ion battery separator comprises 1-15% mass fraction of inorganic nanoparticles, 8-30% mass fraction of nanofibers and 1-5% mass fraction of an adhesive, and the remainder being a solvent. The preparation method therefor comprises the following steps: (1) preparing the nanofibers as a spinning precursor liquid; (2) preparing a dispersion liquid with the inorganic nanoparticles and the spinning precursor liquid; and (3) adding the adhesive to the dispersion liquid, and mixing same until uniform to obtain the functional coating material for a lithium ion battery separator.

Abstract: A composite diaphragm, comprising first particles and second particles, and a binder less than 5 wt %. The first particles and the second particles have different particle sizes of particle compositions, the first particles have a radius of r, and the second particles have a radius of r?, wherein r and r? meet the following relationship: (2?{square root over (3)}/3?1)<(r?/r)<(?{square root over (6)}/2?1); the first particles are prepared from at least one or more of egg shells, duck egg shells, goose egg shells, and other bird or amphibian egg shells; the second particles are prepared from shells and abalone shells; a first particle layer, a second particle layer, and the binder are adopted to form a film, an integrated lithium ion battery composite diaphragm material is formed, an inorganic material is not easy to fall off, and a particle material plays a full role.

Abstract: A high-performance new silicon composite material for a negative electrode of a lithium ion battery and a preparation method thereof by utilizes a conductive polymer PEDOT and a water solution dispersant PSS as a coating layer of nano-Si powder and a carbon source. The Si/C composite material taking a Si-containing type lithium storage material as a main active substance is prepared by firstly polymerizing PEDOT: PSS on the surface of Si through in-situ polymerization reaction and then performing high-temperature carbonization treatment on a prepared Si/PEDOT: PSS composite under an inert atmosphere. The prepared composite material is doped with a small amount of S element. Nano-Si particles are uniformly embedded in a PEDOT: PSS polymer and a carbon matrix. A high yield is achieved by using cheap raw materials and a simple and environment-friendly process. The prepared Si/C composite material has very low initial irreversible capacity loss (2.8%) and excellent charge-discharge.

Abstract: The invention provides a composite electrode material for a lithium ion battery. The composite electrode material includes an electrode material and a conductive polymer. The conductive polymer coats the surface of the electrode material with a thickness of several nano-meter level. The electrode material is a positive electrode material or a negative electrode material, and the conductive polymer tends to disperse in an aqueous solution or an organic solution in the presence of a doping and dispersing agent and a dispersing medium. The conductive polymer is selected from poly(3,4-ethylenedioxythiophene) (PEDOT), polyaniline (PANT), or polypyrrole (PPy), the doping and dispersing agent is polystyrene sulfonic acid (PSS), and the dispersing medium is water; or the conductive polymer is polyaniline(emeraldine salt), and the dispersing medium is xylene. A method for preparing the composite electrode material for a lithium ion battery is also provided.

Abstract: A high-performance new silicon composite material for a negative electrode of a lithium ion battery and a preparation method thereof by utilizes a conductive polymer PEDOT and a water solution dispersant PSS as a coating layer of nano-Si powder and a carbon source. The Si/C composite material taking a Si-containing type lithium storage material as a main active substance is prepared by firstly polymerizing PEDOT: PSS on the surface of Si through in-situ polymerization reaction and then performing high-temperature carbonization treatment on a prepared Si/PEDOT: PSS composite under an inert atmosphere. The prepared composite material is doped with a small amount of S element. Nano-Si particles are uniformly embedded in a PEDOT: PSS polymer and a carbon matrix. A high yield is achieved by using cheap raw materials and a simple and environment-friendly process. The prepared Si/C composite material has very low initial irreversible capacity loss (2.8%) and excellent charge-discharge.