about LiMn2O4

Primary lithium manganese oxide spinel type lithium manganese oxide, spinel-type lithium manganese oxide LiMn2O4 is Hunter in 1981 obtained the first three-dimensional cathode materials for lithium-ion channels, has been subject to many domestic and foreign scholars and researchers great concern, it acts as an electrode material has a low price, high potential, environment-friendly, safety performance advantages, is the most promising alternative to lithium cobalt oxide LiCoO2 become a new generation of lithium-ion battery cathode material.
LiMn 2 O 4 is a typical ionic crystals, and positive and negative two configurations. XRD analysis to know the normal spinel LiMn 2 O 4 is a Fd3m symmetry cubic crystal lattice constant a = 0.8245nm, cell volume V = 0.5609nm3. Fcc oxygen ion is close packed (ABCABC ...., the adjacent edge of octahedral linked taken), lithium occupy 1/8 oxygen tetrahedral interstitial (V4) Position (Li0.5Mn 2 O 4 structure as a lithium sequence order: Lithium orderly occupy 1/16 tetrahedron gap), manganese oxide occupy 1/2 octahedral (V8) position. The unit cell contains 56 atoms: 8 lithium atoms, manganese atoms 16 and 32 oxygen atoms, wherein the Mn 3 + and Mn 4 + 50% each. Unit cell of the spinel structure as the side length is a common face-centered cubic structure (fcc) of the double type, so each cell is actually composed of eight cubic units. This eight cubic unit can be divided into A, B two types. Each cubic element two coplanar, a different type of structure, each of two edges of the cubic unit belong to the same structure. Each small cube unit has four oxygen ions, which are located in the body diagonal midpoint to the center of the apex body diagonal 1/4 and 3/4.