High performance lithium ion battery anode material lithium manganate and preparation method thereof

Abstract

The invention provides a high performance lithium ion battery anode material lithium manganate and a preparation method of the material. The lithium manganate is a doped lithium manganate LiMn2-yXy04 which is doped with one kind or a plurality of other metal elements X, wherein X element is at least one kind selected form the group of aluminium, lithium, fluorine, silver, copper, chromium, zinc, titanium, bismuth, germanium, gallium, zirconium, stannum, silicon, cobalt, nickel, vanadium, magnesium, calcium, strontium, barium and rare earth elements lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, and y is larger than 0 but less than or equal to 0.11. The lithium ion battery anode material lithium manganate provided in the invention has extraordinary charge and discharge cycle performance both in the environments of normal temperature and high temperature. According to the invention, the preparation method of the material is a solid phase method, the operation is simple and controllable and the cost is low so that it is easy to realize large-scale productions.

Description

technical field [0001] The invention relates to a high-performance lithium ion battery positive electrode material lithium manganese oxide and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials and its preparation. Background technique [0002] With the inclination of countries around the world to the new energy battery industry, lithium-ion power batteries, as an ideal energy source for the development of the 21st century, have attracted more and more attention. The composition of lithium-ion batteries includes electrode (positive and negative) materials, separators and electrolytes. Negative electrode materials are mainly graphite and solid carbon particles; between the positive and negative electrodes are battery electrolyte and separator; the positive electrode material is the core of lithium batteries and is an important factor that determines its electrochemical performance, safety performance and future...

AI Technical Summary

Problems solved by technology

However, the specific capacity of the spinel lithium manganese oxide material is low, and its performance is unstable at high temperature, and the dissolution of manganese caused by the presence of HF in the electrolyte causes the capacity of lithium manganate to decay rapidly, and at the same time, the problems such as rapid capacity decay

The above problems have greatly limited its application in actual lithium-ion batteries, and have become the key to whether lithium manganate can be applied on a large scale, especially in high-current charge-discharge batteries.

[0004] Although many researchers have done a lot of work, active research and development has adopted the sol-gel method (C.J.Curtis, J.X.Wang, D.L.Schulz, J.Electrochem.Soc.151(2004)A590.), hard template method (J. Cabana, T.Valdes-Solis, M.R.Palacin, J.Oro-Sole, A.Fuertes, G.Marban, A.B.Fuertes, J.Power Sources 166(2007)492.), hydrothermal method (①J.Y.Luo, X.L.Li, Y.X.Xia, Electrochim.Acta 52(2007)4525; ②C.H.Jiang, S.X.Dou, H.K.Liu, M.Ichihara, H.S.Zhou, J.Power Sources 172(2007)410.) and other methods to The preparation of lithium manganate positive electrode materials has improved the electrical properties of lithium manganate positive electrode materials to a certain extent. However, due to the complex process or high cost of the above method, it is not only not suitable for large-scale industrial production, but also It still cannot meet the increasingly high requirements of lithium manganese oxide cathode materials for secondary lithium-ion batteries in practical applications