This technology is an anode active material that induces Li intercalation reactions while maintaining a single phase without secondary phases such as WO3 or MgO. It achieves this by doping a monoclinic magnesium tungsten oxide (MgWO4) base material (space group P 2/c) with Ni or Co and precisely controlling the atomic ratio of Mg to W (Mg/W).
Conventional AWO4-based anode active materials store lithium through conversion reactions during charge and discharge, which leads to issues such as pulverization of the active material, electrical shorts, unstable SEI formation, and volume expansion. Furthermore, simple doping often caused structural instability, resulting in the formation of secondary phases.
This technology ensures structural stability by substituting Ni or Co doping metals (0 < y ≤ 0.1) into an MgWO4 base material with an adjusted Mg/W atomic ratio of 1+x : 1-x (0 < x ≤ 0.025). As a result, a Li intercalation mechanism in a layered structure operates instead of a conversion reaction, achieving high capacity and long cycle life. It can be applied to lithium secondary batteries for power grid-connected ESS that require long life, and for electric vehicle anodes where particle pulverization must be avoided during fast charging. It provides design flexibility, allowing for increased doping levels without disrupting the pure crystalline phase.
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