A compound represented by Li.sub.aCo.sub.(1-x-2y)Me.sub.x(M1M2).sub.yO.sub.δ, (Formula (I)) wherein Me, is one or more of Li, Mg, Al, Ca, Ti, Zr, V, Cr, Mn, Fe, Ni, Cu, Zn, Ru and Sn, and wherein 0≤x≤0.3, 0<y≤0.4, 0.95≤α≤1.4, and 1.90≤δ≤2.10 is disclosed. Further, particles including such compounds are described.

Simple, material-efficient microgranulation methods are disclosed for aggregating precursor particles into larger product particles with improved properties and, in some instances, novel structures. The product particles are useful in applications requiring uniform, smooth, spherical, or rounded particles such as for electrode materials in lithium batteries and other applications.

A mixed conductor, a method of preparing the same, and a cathode, a lithium-air battery, and an electrochemical device each including the mixed conductor. The mixed conductor is represented by Formula 1 and having electronic conductivity and ionic conductivity:
Li.sub.xMO.sub.2-δ  Formula 1 wherein, in Formula 1, M is a Group 4 element, a Group 5 element, a Group 6 element, a Group 7 element, a Group 8 element, a Group 10 element, a Group 11 element, a Group 12 element, or a combination thereof, and 0<x<1 and 0≤δ≤1 are satisfied.

Supplemental lithium can be used to stabilize lithium ion batteries with lithium rich metal oxides as the positive electrode active material. Dramatic improvements in the specific capacity at long cycling have been obtained. The supplemental lithium can be provided with the negative electrode, or alternatively as a sacrificial material that is subsequently driven into the negative electrode active material. The supplemental lithium can be provided to the negative electrode active material prior to assembly of the battery using electrochemical deposition. The positive electrode active materials can comprise a layered-layered structure comprising manganese as well as nickel and/or cobalt.

The inventive concept discloses a cathode active material containing an organic molecule containing oxygen and a transition metal-based metal oxide.

The inventive concept discloses a method for preparing a cathode active material containing a lithium manganese oxide exhibiting a reversible phase transition, and exhibiting electrochemical characteristics of the lithium manganese oxide through the reversible phase transition including (A) synthesizing a sodium manganese oxide using a manganese precursor, and (B) reacting the sodium manganese oxide with a lithium precursor to synthesize the lithium manganese oxide, or including (C) directly synthesizing the lithium manganese oxide.

This disclosure provides systems, methods, and apparatus related to lithium metal oxyfluorides. In one aspect, a method for manufacturing a lithium metal oxyfluoride having a general formula Li.sub.1+x(MM′).sub.zO.sub.2-yF.sub.y, with 0.6≤z≤0.95, 0<y≤0.67, and 0.05≤x≤0.4, the lithium metal oxyfluoride having a cation-disordered rocksalt structure, includes: providing at least one lithium-based precursor; providing at least one redox-active transition metal-based precursor; providing at least one redox-inactive transition metal-based precursor; providing at least one fluorine-based precursor comprising a fluoropolymer; and mixing the at least one lithium-based precursor, the at least one redox-active transition metal-based precursor, the at least redox-inactive transition metal-based precursor, and the at least one fluorine-based precursor comprising a fluoropolymer to form a mixture.

An electrochemical voltage source has an anode containing lithium, a cathode containing manganese oxide, and a housing. The cathode and the anode are arranged in an interior of the housing and are arranged opposite one another. An electrolyte reservoir in the form of a compressible storage body, which receives an electrolyte, is arranged between the anode and the cathode. The storage body has a first side resting against an end face of the cathode and a second side, which faces away from the first side, and rests against an end face of the anode. The cathode experiences an increase in volume when the voltage source is discharged. The anode experiences a decrease in volume during the discharge. During the discharge, the absolute value of the volume increase of the cathode is at least as great as the absolute value of the volume decrease of the anode.

Previous hybrid-anion and cation-redox (HACR) cathodes were limited in cycling performance by irreversible anionic redox reactions caused by the loss of anions. To overcome this limitation, a lithium (Li) transition metal (M) oxide particle is described having a Li concentration gradient. In one example, the particle includes a Li-rich core region that provides capacity and energy density due anionic and cationic contributions and a Li-poor surface region surrounding the core region to inhibit anionic activity and thus substantially reduce the loss of anions. A gradient region disposed between the core and surface regions has a Li concentration profile that varies from a first Li concentration in the core region to a second Li concentration in the surface region. A high-temperature leaching method may be used to leach LiO from a Li-rich Li.sub.1+xM.sub.1−XO.sub.2 particle, thus forming a coherent Li gradient with a stabilized layered structure.

A positive-electrode active material contains a lithium composite oxide, wherein the lithium composite oxide is a multiphase mixture including a first phase, of which a crystal structure belongs to a space group Fm-3m, and a second phase, of which a crystal structure belongs to a space group Fd-3m; and in an XRD pattern of the lithium composite oxide, the integrated intensity ratio I.sub.(18°-20°)/I.sub.(43°-46°) of a first maximum peak I.sub.(18°-20°) within a first range of 18 degrees to 20 degrees at a diffraction angle 2θ to a second maximum peak I.sub.(43°-46°) within a second range of 43 degrees to 46 degrees at the diffraction angle 2θ satisfies 0.05≤I.sub.(18°-20°)/I.sub.(43°-46°)≤0.90.