Understanding of the reaction mechanism for Li2MnO3 activation by using the composite reaction of Li2MnO3 and NiO for high energy density Li-ion batteries

Abstract

3d transition metal-based Li-rich layered cathode materials , which have been considerably attractive because of extremely high capacity (>250mAh/g) and affordable in commercial view, are composed of Li2MnO3 and LiTMO2 (TM = Ni, Co, Mn). High capacity, especially oxygen redox, is mainly originated from not the LiTMO2 but the Li2MnO3 component since the latter has more much amount of lithium, and hereby Li-O-Li configuration. In general, Li-rich layered oxides are manufactured by adding Li and TM precursors into one spot at the same time according to the targeting composition through solid-state reaction, co-precipitation, and sol-gel preparation, etc. So, Since final Li2MnO3 and LiTMO2 phases are formed concurrently, it is tough to understand reaction process inter and or intra two phases, specifically with respect to Li2MnO3 activation. Our group has researched the reaction mechanism and critical factors for Li2MnO3 activation by synthesizing Li2MnO3 and NiO separately and then utilizing their composite reaction. The new composite process such as Li2MnO3/NiO has the greatest advantage in understanding the mechanism for Li2MnO3 activation by controlling component content (eg. Ni2+) without the effect on other elements (eg. Mn4+). So, we suggest a new way to research the activation of specific substances such as Li2MnO3 activation.

3d transition metal-based Li-rich layered cathode materials , which have been considerably attractive because of extremely high capacity (>250mAh/g) and affordable in commercial view, are composed of Li2MnO3 and LiTMO2 (TM = Ni, Co, Mn). High capacity, especially oxygen redox, is mainly originated from not the LiTMO2 but the Li2MnO3 component since the latter has more much amount of lithium, and hereby Li-O-Li configuration. In general, Li-rich layered oxides are manufactured by adding Li and TM precursors into one spot at the same time according to the targeting composition through solid-state reaction, co-precipitation, and sol-gel preparation, etc. So, Since final Li2MnO3 and LiTMO2 phases are formed concurrently, it is tough to understand reaction process inter and or intra two phases, specifically with respect to Li2MnO3 activation. Our group has researched the reaction mechanism and critical factors for Li2MnO3 activation by synthesizing Li2MnO3 and NiO separately and then utilizing their composite reaction. The new composite process such as Li2MnO3/NiO has the greatest advantage in understanding the mechanism for Li2MnO3 activation by controlling component content (eg. Ni2+) without the effect on other elements (eg. Mn4+). So, we suggest a new way to research the activation of specific substances such as Li2MnO3 activation.