Abstract: Provided is a method for preparing a cobalt-free positive electrode material, the method comprising the following steps: (1) mixing lithium titanate and a metal source, carrying out a primary sintering treatment, adding a carbon source, and carrying out a secondary sintering treatment to obtain a carbon-coated, metal-doped lithium titanate additive; (2) mixing a lithium source with a cobalt-free precursor, and performing a high-temperature treatment to obtain a substrate material; and (3) mixing the carbon-coated, metal-doped lithium titanate additive with the substrate material, and then performing a heat treatment to obtain a cobalt-free positive electrode material. Further provided are a cobalt-free positive electrode material prepared by means of the preparation method, a positive electrode sheet including the positive electrode material, and a lithium-ion battery including the positive electrode sheet.

Abstract: The present application provides an iron-manganese-based positive electrode material, and a preparation method therefor and the use thereof. The iron-manganese-based positive electrode material is LiaFexMnyO2, wherein a=0.1-0.5, 0<x<1.0, 0<y<1.0, and x+y=1; the valence state of at least some of the manganese elements in the iron-manganese-based positive electrode material is positive tetravalence; and the maximum intensity of the characteristic peak of the Li2MnO3 crystal phase in the XRD spectrum of the iron-manganese-based positive electrode material is less than one third of the maximum characteristic peak intensity of the iron-manganese-based positive electrode material, or there is no characteristic peak of the Li2MnO3 crystal phase. In the present application, the initial efficiency and the cycling performance are further better improved by controlling the components and crystal structure of the iron-manganese-based positive electrode material.

Abstract: The present application provides an iron-manganese-based positive electrode material, and a preparation method therefor and the use thereof. The preparation method comprises the steps of: S1, subjecting an inorganic compound of lithium and a FexMny(OH)2 precursor to oxidation sintering to obtain an intermediate product, wherein 0<x<1.0, 0<y<1.0, and x+y=1, and the ratio of the molar amount of Li in the inorganic compound of lithium to the total molar amount of Fe and Mn in the FxMny(OH)2 precursor is (0.1-0.5):1; and S2, subjecting the intermediate product to a second sintering under nitrogen or first inert gas atmosphere conditions to obtain the iron-manganese-based positive electrode material.

Abstract: The disclosure provides a composite anode electrode material and a preparation method thereof, an anode electrode material and a lithium ion battery. The composite anode electrode material includes a defect-type transition metal oxide and a lithium titanate, wherein the lithium titanate is compounded with the defect-type transition metal oxide in the manner of coating and/or doping, the defect-type transition metal oxide is a secondary particle, and a transition metal element in the defect-type transition metal oxide is selected from any one of tungsten, yttrium and tin. The probability of a side reaction between the defect-type transition metal oxide and an electrolyte is greatly reduced and a volume expansion effect of an anode electrode of a battery in the process of deintercalating lithium ions is greatly reduced, thereby the lithium ion battery including the composite anode electrode material has a higher capacity retention rate after cycling.