Lithium ion battery

Abstract

The invention discloses a lithium ion battery. The lithium ion battery comprises an anode, a cathode and electrolyte, wherein the electrolyte contains a lithium salt and a solvent. The lithium ion battery is characterized in that an active material of the anode is a lithium-rich manganese based solid solution; an active material of the cathode is lithium titanate; the solvent comprises fluoro carbonate and an additive including one or more of fluoro methylsulfolane or a derivative thereof, fluoromethyl-1,3,2-dioxathiolane 2-oxide or a derivative thereof and fluoromethyl ethylene sulfate or a derivative thereof; a general formula of the lithium-rich manganese based solid solution is xLi2MnO3.(1-x)LiMO2, wherein x is greater than 1.2 and smaller than 1.5, M is any one of Ni, Co, Mn, Cr, Ni0.5Mn0.5 and Ni1 / 3Mn1 / 3Co1 / 3; the lithium salt is one or more of LiPF6, LiBF4, LiClO4, LiAsF6, LiBOB, LiCF3SO3; reversible capacity is larger than 250mAh / g, energy density is higher than that of other traditional anode materials, and high-temperature performance is excellent.

Description

technical field [0001] One aspect of the present invention relates to the field of batteries, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] Energy and the environment are two major issues facing mankind in the 21st century. In my country, with the acceleration of industrialization and urbanization, the demand for oil continues to increase, and the supply of oil in my country is in short supply, so the dependence on foreign countries continues to increase. As more and more oil and coal are mined and burned, and greenhouse gases such as CO2 in the atmosphere continue to increase, China will face increasing pressure to reduce carbon emissions. The promotion of new energy vehicles and the development and utilization of new energy are strategic measures for the country to build an energy-saving society and reduce dependence on traditional energy sources. It is an inevitable choice for economic transformation under the pres...

AI Technical Summary

Problems solved by technology

At the same time, traditional lithium-ion battery cathode materials such as lithium cobaltate, lithium manganate, ternary materials, and lithium iron phosphate cannot meet the requirements of battery energy density, safety, and cost in the field of new energy to a large extent.