High-energy-density, fast-charging lithium iron phosphate battery

Abstract

The invention discloses a high-energy-density, fast-charging lithium iron phosphate battery. The battery is compose of a positive electrode current collector and positive electrode slurry, wherein that positive electrode current collector adopts microporous aluminum foil, the positive electrode slurry adopts nanometer lithium iron phosphate / conductive agent composite material, and the conductive agent is coated on the surface of nanometer lithium iron phosphate, and the positive electrode slurry comprises 97-98.5% of nanometer lithium iron phosphate, 0.5%-1.5% of nanometer lithium iron phosphate and 0.5-1% binder; The cathode slurry is made of synthetic graphite with 0.5-3 degree of orientation. The electrolyte is a mixture of small molecular organic solvents of carboxylic acid ester and cyclic carbonate and chain carbonate. The high-energy-density, fast-charging lithium iron phosphate battery has high energy density reaching 140-150Wh / kg, and can charge 96% in 10min and charge full in15min at 6C rate charging condition.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a high-energy-density, fast-charging lithium iron phosphate battery. Background technique [0002] Today's new energy vehicle market continues to be hot, and the field of power batteries is showing a high-speed development trend. In the development of the power battery industry, lithium iron phosphate batteries have always been an important choice for power battery technology routes due to their light weight, large capacity, long cycle life, and high safety performance, especially in the field of passenger cars. However, with the gradual reduction of the national new energy vehicle subsidies and the higher and higher energy density requirements for power batteries used in new energy vehicles, the competition of lithium iron phosphate power batteries in the bus market will become increasingly fierce. At the same time, with the continuous promotion of new energy vehi...

AI Technical Summary

Problems solved by technology

At the same time, appropriately reduce the thickness of the current collector, the thickness of the diaphragm, and the amount of electrolyte, reduce the weight of the battery cell and increase the energy density, but to a certain extent increase the unsafe factors of the battery and have a certain impact on the battery life

Therefore, how to develop fast-charge batteries and solve the problem of low energy density of fast-charge batteries on the basis of ensuring the safety and cycle performance of fast-charge batteries is a challenging topic for current research.