High-energy-density long-service-life fast-charging lithium ion battery and preparation method thereof

Abstract

The invention discloses a high-energy-density long-service-life fast-charging lithium ion battery and a preparation method thereof, wherein the low temperature is -20 DEG C, the multiplying power of rapid charging is 1C and 2C respectively, the multiplying power of rapid discharging is 1C and 3C respectively, the lithium ion battery mainly consists of five parts, namely a positive electrode sheet,a negative electrode sheet, a ceramic diaphragm, an electrolytic solution and a battery shell, and is prepared by combining and laminating the positive electrode sheet, the ceramic diaphragm, the negative electrode sheet and the ceramic diaphragm, putting into the battery shell, injecting the electrolytic solution and carrying out opening formation, sealing and grading capacity. According to theinvention, through preferable materials of lithium nickel cobalt aluminate, a silicon-carbon composite material, a macromolecular plasticizer, a nano-microporous carbon-coated aluminum net, a nano-microporous copper net, a high-temperature insulating tape, a polymer adhesive, a ceramic diaphragm, an electrolytic solution, a battery shell and the like and a preferable process technology, the beneficial effects of the battery are completely achieved, and the battery is suitable for application in the fields of 3C, power, energy storage and the like.

Description

technical field [0001] The invention relates to the technical field of 3C, power and energy storage lithium-ion secondary batteries, in particular to a preparation method of a fast-charge lithium-ion battery with high energy density and long life. Background technique [0002] In today's society, with the rapid development of economy, the energy crisis and environmental problems are becoming more and more serious. Because of its high energy density, high power density, long cycle life, no memory effect, low self-discharge rate, wide operating temperature range, safety and reliability, and environmental friendliness, lithium-ion batteries have been widely used in 3C, power and energy storage fields. has been widely used. At the same time, it also shows good application prospects in special fields such as pure electric vehicles, hybrid vehicles and military industry. [0003] However, in recent years, the demand for battery energy density in various fields has increased rapi...

AI Technical Summary

Problems solved by technology

It is difficult for lithium-ion batteries made of these positive / negative electrode materials to achieve higher energy density under low temperature and fast charge and discharge conditions. The energy density of conventional "iron lithium / graphite" batteries is 130-140wh / kg, and "cobalt The energy density of lithium manganate / graphite battery is 135-150wh / kg, the energy density of lithium manganate / graphite battery is 100-120wh / kg, and the energy density of lithium manganese nickel manganate / graphite battery is 200-220wh / kg , so the space for improving the energy density of lithium-ion batteries is quite limited

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