High-performance lithium ion battery and preparation process thereof

Abstract

The invention relates to a high-performance lithium ion battery. According to the battery, an electrode material is subjected to a nano-composite treatment of grapheme and polyaniline; an anode current collector comprises aluminium foil; a cathode current collector comprises copper foil; a conductive agent comprises superconducting carbon black, conductive graphite or acetylene black; a binding agent comprises styrene butadiene rubber, carboxymethylcellulose sodium, polytetrafluoroethylene, polyvinylidene difluoride or hydroxy propyl methylcellulose; a electrolyte comprises liquid electrolyte or a polymer electrolyte containing a conductive polymer, a nano-material, or a mixture comprising the conductive polymer and the nano-material; a membrane is subjected to a high temperature resistant insulation coating treatment, or directly adopts a high temperature resistant insulating porous polymer matrix. A preparation process for the high-performance lithium ion battery comprises: material preparing, coating, drying, rolling, slicing, coil winding or sheet stacking, assembling, liquid injecting, formation and capacity distributing. The lithium ion battery provided by the present invention has characteristics of excellent charge and discharge performance at the large rate, small capacity fading, good heat stability, good safety performance and long electrode cycle life, and can be widely applicable for the fields of electric bicycles, electric motorcycles, electric cars and the like.

Description

technical field [0001] The invention relates to a battery, in particular to a high-performance lithium ion battery and a manufacturing process thereof. Background technique [0002] Compared with other batteries, lithium-ion batteries have the advantages of light weight, small size, high average voltage, high energy density, high output power, high charging efficiency, no memory effect, long cycle life, wide operating temperature, and small self-discharge. It has been widely used in the fields of computers and notebook computers. However, there are still many technical bottlenecks in lithium-ion batteries at present, such as: with the increase of the number of cycles, the battery capacity decays greatly; the anti-overcharge performance is poor; the thermal stability is poor, and there are potential safety hazards; the charge and discharge performance at high rates is poor. , the development and application of large-scale lithium-ion batteries such as electric vehicle batter...

AI Technical Summary

Problems solved by technology

Chinese patent CN 101237036 B in-situ coated polyaniline on the surface of lithium iron phosphate powder, the positive electrode material of lithium ion battery, but the charge and discharge performance of the obtained lithium ion battery was not good at high rate

Chinese patent CN 101714460A composites an acrylic polymer with a conductive polypyrrole, and then absorbs a liquid electrolyte into the compound to obtain a polypyrrole / polyacrylic acid composite gel electrolyte. The electrolyte has high conductivity, but the mechanical properties of the electrolyte poor strength

[0007] Lithium-ion batteries charged and discharged at high rates will generate more heat, which will easily lead to the melting of the diaphragm, making it easy to short-circuit between the positive and negative electrodes, causing combustion or even explosion, which will bring serious safety hazards

Chinese patent CN 101567434A prepares a polymer diaphragm containing flame-retardant inorganic fillers. When the film is heated, the inorganic fillers will move with the softening of the polymer, thus easily losing its protective function.

At present, the relevant technology of this type of lithium-ion battery has not been reported.