Anode active material for a rechargeable lithium battery

摘要

An anode active-material for rechargeable lithium batteries and methods of manufacturing the same. This includes preparing an anode active-material for rechargeable lithium batteries, including heat-treating a mixture of Li2CO3, MnO2, MgO, Al2O3 and Co3O4 at 900-1000° C. in air or oxygen for 10-48 hours, generating a lithium-containing oxide; generating metal-oxide nanoparticles MO (5-500 nm) (M represents Mg, Co or Ni, with a valence of 2); and dry or wet mixing 0.01-10 wt % of pulverized metal oxide nanoparticles with the lithium-containing oxide to form an anode active-material. Spinel type MgAl2O4 is substituted into a basic spinel-structure (Li1.1Mn1.9O4) for structural stability. Spinel type Co3O4 is substituted to improve electronic conductivity, improving battery performance. Metal-oxide nanoparticles (5-500 nm) act as scavengers of HF generated by electrolyte decomposition, wherein the spinel type anode active-material may be used as an anode active-material of spinel type LiMn2O4 for rechargeable lithium ion batteries, realizing low-price, high-output, long-lifespan and high-capacity.

主权项

1. An anode active material for rechargeable lithium batteries, comprising a spinel type anode active material (Li1.1Mn1.9O4)1-x-y(MgAl2O4)x(Co3O4)y where 0.001≦x≦0.2 and 0.001≦y≦0.2), which is formed by substituting spinel type (MgAl2O4)x and spinel type (Co3O4)y into a basic spinel structure represented by (Li1.1Mn1.9O4)1-x-y.