Lithium ion battery positive pole material cobalt nickel oxide manganses lithium and method for making same

Abstract

The invention relates to a nickel cobalt manganese lithium oxide material used for an anode of a li-ion battery and a preparation method. The invention belongs to the li-ion battery technical field. The nickel cobalt manganese lithium oxide material used for the anode of the li-ion battery is a li-rich laminated structure with the chemical component of Li1+zM1-x-yNixCoyO2; wherein, z is less than or equal to 0.2 and more than or equal to 0.05, x is less than or equal to 0.8 and more than 0.1, and y is less than or equal to 0.5 and more than 0.1. The preparation method of the invention is that dissoluble salt of the nickel, cobalt and manganese is taken as the raw material; ammonia or ammonium salt is taken as complexing agent; sodium hydroxide is taken as precipitator; water-dissoluble dispersant and water-dissoluble antioxidant or inert gas are added for control and protection; in a cocurrent flow type the solution is added to a reaction vessel for reaction; after alkalescence disposal, aging procedure, solid-liquid separation and washing and drying, the nickel cobalt manganese oxide is uniformly mixed with the lithium raw material; the nickel cobalt manganese lithium oxide powder is obtained by sintering the mixed powder which is divided into three temperature areas. The invention has the advantages of high specific capacity, good circulation performance, ideal crystal texture, short production period, low power loss, and being suitable for industrial production, etc.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery anode material nickel-cobalt-manganese-lithium oxide and a preparation method thereof. Background technique [0002] At present, commercial lithium-ion battery cathode materials can be roughly divided into three categories according to their crystal structures: (1) α-NaFeO 2 type layered structure, whose representative component is LiCOO 2 , LiNiO 2 , LiMnO 2 and their respective derivatives, however, commercially available LiCOO 2 Due to the high cost of cobalt, and only about 50% of the theoretical capacity (274mAh / g), and the safety problems of rapid capacity decline and oxygen evolution when the charging voltage is higher than 4.3V; LiNiO 2 Its stoichiometric components are difficult to synthesize, and Li on the Li plane + and Ni 2+ The mixed row results in its poor electrochemical performance. Layered LiMnO 2 It itself ...

AI Technical Summary

Problems solved by technology

[0002] At present, commercial lithium-ion battery cathode materials can be roughly divided into three categories according to their crystal structures: (1) α-NaFeO 2 type layered structure, whose representative component is LiCOO 2 , LiNiO 2 , LiMnO 2 and their respective derivatives, however, commercially available LiCOO 2 Due to the high cost of cobalt, and only about 50% of the theoretical capacity (274mAh / g), and the safety problems of rapid capacity decline and oxygen evolution when the charging voltage is higher than 4.3V; LiNiO 2 Its stoichiometric components are difficult to synthesize, and Li on the Li plane + and Ni 2+ The mixed arrangement results in extremely poor electrochemical performance

Layered LiMnO 2 It itself is a metastable structure, which cannot meet the actual use

(2) Spinel structure: its representative component is LiMnO 4 and derivatives, LiMnO 4 Although the price is low, the actual capacity is only 120mAh / g, which cannot meet the requirements of high-capacity lithium-ion batteries; (3) Olivine structure, the representative component of which is LiFePO 4 and its derivatives; although LiFePO 4 It has very excellent thermal stability, the theoretical capacity is 170mAh / g but the actual capacity is below 140mAh / g, and the working voltage is low (about 3.4VO 3 Li + / Li) Poor electronic conductivity, low diffusion of lithium in the solid phase, and poor high-current charge and discharge performance, thus restricting the energy density and power density of lithium-ion batteries