Provided is a tetrafluoroethylene-based polymer composition for use in an electrochemical device binder, the tetrafluoroethylene-based polymer composition being homogenously mixable with powder components in electrochemical devices and being capable of providing a mixture sheet having excellent strength and excellent flexibility. Also provided are an electrochemical device binder, an electrode mixture, an electrode, and a secondary battery each containing the tetrafluoroethylene-based polymer composition. The present invention relates to a tetrafluoroethylene-based polymer composition for use in an electrochemical device binder, the tetrafluoroethylene-based polymer composition having endothermic peaks in a region (A) of 330 C. or higher and lower than 340 C. and in a region (B) of 340 C. or higher and 350 C. or lower in differential scanning calorimetry.

An electrode precursor composition for an alkali metal ion secondary cell is described. The composition includes a polymer-solvent gel matrix phase and a dispersed phase containing an electrochemically active material. The electrochemically active material has a multimodal particle size distribution having a D.sup.1.sub.50/D.sup.2.sub.50 in the range 2 to 15. The electrode precursor composition can be processed into an electrode for an alkali metal ion secondary cell, for example a lithium ion secondary cell.

Apparatuses, systems, materials, and methods for preparing polyethylene electrodes for use in energy storage and transfer via dry electrode processing is described herein. Ultra-high molecular weight polyethylene (UHMWPE) particles and filler particles are used to form a blended composition. With shear, the UHMWPE fibrillates to durably enmesh the filler particles. The blended composition with the fibrillated UHMWPE particles may, in turn, be used to form an article, such as an electrode. The blended composition may contain less than 10% by weight of the UHMWPE. The UHMWPE has a molecular weight of at least about 2,000,000 g/mol, a bulk density from about 0.04 g/mL to about 0.25 g/mL, and a melt enthalpy of at least 190 J/g. In some embodiments, the UHMWPE may be conditioned to alter the size and/or shape of the particles. The median diameter of the conditioned UHMWPE particles is from 5 microns to 300 microns.

The present invention relates to the technical field of lithium-ion batteries, and particularly provides a positive electrode sheet and a preparation method therefor, and a lithium-ion battery comprising the positive electrode sheet. The positive electrode sheet comprises a positive electrode active material layer, and the positive electrode active material layer comprises a positive electrode material, a negative thermal expansion material, a conductive agent, and a binder, wherein the characteristic value J of the positive electrode sheet satisfies: 0.001J0.005. wherein J=R(F)/, R(F) represents the peak intensity ratio between the main peak (F) of the negative thermal expansion material and the (003) characteristic peak of the positive electrode material in the XRD pattern of the positive electrode sheet, and p represents the surface density of the positive electrode sheet, with a unit of mg/cm.sup.2.

The present invention relates to an ionomer resin, comprising a (meth)acrylic acid unit (A), a neutralized (meth)acrylic acid unit (B) and an ethylene unit (C), wherein a total content of the unit (A) and the unit (B) is 6 to 10% by mole based on all monomer units constituting the ionomer resin, and the content of a transition metal in the ionomer resin is 0.01 to 100 mg/kg.

A fireproof and flame-retardant material based on waste slag of aluminum factory, a preparation method and applications thereof, and a flame-retardant cable and a preparation method thereof are provided. The present disclosure provides a fireproof and flame-retardant material based on waste slag of aluminum factory, measured by weight parts, including raw materials: waste slag of aluminum factory (dry weight) 1-6 phr, inorganic hydroxide 0-6 phr, VAE latex 3-8 phr, and water 20-50 phr. The present disclosure only uses water as a solvent, VAE latex as a polymer matrix, the waste slag of aluminum factory and inorganic hydroxide as fillers. The price of raw materials is low and easy to obtain. The fireproof and flame-retardant material based on the waste slag of aluminum factory has excellent flame retardant, tensile strength, elongation and gram weight.