Methods and systems for the extraction of magnetic material from magnet containing material, and for extraction of rare earth elements (REEs) from the magnetic material are disclosed. An exemplary system includes a milling unit for magnet containing material such as end-of-life motors, hard drives, partially deconstructed motors, magnet-containing end-of-life product, or parts thereof, and outputting magnetic components by exploiting magnetic properties of ferromagnetic and paramagnetic materials in the presence and absence of electromagnetic fields in conjunction with other physical properties such as size and density. The system also includes a chemical processing unit for receiving the magnetic components to extract rare earth elements in the material. Chemical processes are disclosed for separating and recovering rare earth elements, iron, mixed hydroxide precipitate (e.g., nickel, cobalt), and/or boron, from magnetic components.

Methods and systems for the extraction of magnetic material from magnet containing material, and for extraction of rare earth elements (REEs) from the magnetic material are disclosed. An exemplary system includes a milling unit for magnet containing material such as end-of-life motors, hard drives, partially deconstructed motors, magnet-containing end-of-life product, or parts thereof, and outputting magnetic components by exploiting magnetic properties of ferromagnetic and paramagnetic materials in the presence and absence of electromagnetic fields in conjunction with other physical properties such as size and density. The system also includes a chemical processing unit for receiving the magnetic components to extract rare earth elements in the material. Chemical processes are disclosed for separating and recovering rare earth elements, iron, mixed hydroxide precipitate (e.g., nickel, cobalt), and/or boron, from magnetic components.

The present disclosure relates to the technical field of lithium-ion batteries, and discloses a lithium-rich manganese oxide cathode material, a preparation method and use thereof, and a positive electrode plate and use thereof. The cathode material has a chemical composition of xLi[Li.sub.1/3(Mn.sub.1-aM.sub.a).sub.2/3]O.sub.2.Math.(1x)LiMn.sub.1-bM.sub.bO.sub.2. An XRD spectrum of the cathode material has a diffraction peak P.sub.(1) in a range of a diffraction angle 2.sub.1 satisfying [43.5(1x)+44x]2.sub.1[44(1x)+45x]; and the XRD spectrum of the cathode material has a diffraction peak P.sub.(2) in a range of a diffraction angle 2.sub.2 satisfying [17.7(1x)+18.3x]2.sub.2[19.2(1x)+19.8x], where 0.35x0.63. The cathode material has high first-cycle efficiency, high discharge capacity, high energy efficiency, high rate performance, and high cycle performance.

The present disclosure relates to the technical field of lithium-ion batteries, and discloses a lithium-rich manganese oxide cathode material, a preparation method and use thereof, and a positive electrode plate and use thereof. The cathode material has a chemical composition of xLi[Li.sub.1/3(Mn.sub.1-aM.sub.a).sub.2/3]O.sub.2.Math.(1x)LiMn.sub.1-bM.sub.bO.sub.2. An XRD spectrum of the cathode material has a diffraction peak P.sub.(1) in a range of a diffraction angle 2.sub.1 satisfying [43.5(1x)+44x]2.sub.1[44(1x)+45x]; and the XRD spectrum of the cathode material has a diffraction peak P.sub.(2) in a range of a diffraction angle 2.sub.2 satisfying [17.7(1x)+18.3x]2.sub.2[19.2(1x)+19.8x], where 0.35x0.63. The cathode material has high first-cycle efficiency, high discharge capacity, high energy efficiency, high rate performance, and high cycle performance.

A positive electrode active material precursor particle and/or a positive electrode active material particle according to one embodiment of the present disclosure include a core portion and a shell portion, the core portion includes nickel (Ni) and aluminum (Al), the shell portion includes cobalt (Co), a mol % value of the nickel (Ni) of the core portion is greater than a mol % value of nickel (Ni) of the shell portion, a mol % value of the aluminum (Al) of the core portion is greater than a mol % value of aluminum (Al) of the shell portion, and a mol % value of the cobalt (Co) of the shell portion is greater than a mol % value of cobalt (Co) of the core portion.

The present invention relates to a positive electrode active material and a lithium secondary battery including the same, and more particularly, to a positive electrode active material including an overlithiated lithium manganese-based oxide, which can prevent a rapid decrease in the lifetime of the lithium secondary battery by suppressing and mitigating the elution of transition metals from the lithium manganese-based oxide and reduce gas generation due to side reactions in the battery, and a lithium secondary battery including the same.

A positive electrode active material precursor particle and/or a positive electrode active material particle according to one embodiment of the present disclosure include a core portion and a shell portion, the core portion includes nickel (Ni) and zirconium (Zr), the shell portion includes cobalt (Co), a mol % value of the nickel (Ni) of the core portion is greater than a mol % value of nickel (Ni) of the shell portion, a mol % value of the zirconium (Zr) of the core portion is greater than a mol % value of zirconium (Zr) of the shell portion, and a mol % value of the cobalt (Co) of the shell portion is greater than a mol % value of cobalt (Co) of the core portion.

Embodiments of the present disclosure disclose a low-cost alkaline secondary battery positive electrode material and a preparation method and application thereof, which belongs to the technical field of alkaline secondary battery. The positive electrode material includes a composite positive electrode material including manganese dioxide and partially oxidized layered hydroxide, etc. The composite positive electrode material prepared by the embodiments of the present disclosure has the advantage of a high discharge platform, or the like, with respect to a conventional manganese electrode, which significantly improves the cycling stability and reversibility of the zinc-manganese alkaline secondary battery.

Embodiments of the present disclosure disclose a low-cost alkaline secondary battery positive electrode material and a preparation method and application thereof, which belongs to the technical field of alkaline secondary battery. The positive electrode material includes a composite positive electrode material including manganese dioxide and partially oxidized layered hydroxide, etc. The composite positive electrode material prepared by the embodiments of the present disclosure has the advantage of a high discharge platform, or the like, with respect to a conventional manganese electrode, which significantly improves the cycling stability and reversibility of the zinc-manganese alkaline secondary battery.

A high-voltage low-cobalt ternary positive electrode material has a general formula Li.sub.aNi.sub.bCo.sub.cMn.sub.dO.sub.2, where 0.97a1.1, 0.5b0.76, 0c0.1, 0.24d0.5, b+c+d=1, and c<0.35d. Compared with the prior art, the positive electrode material can be used at a higher voltage compared to other ternary positive electrode materials which have the same nickel content as the positive electrode material, such that the energy density is increased, and because the positive electrode material has a smaller change in size, the cracking and powdering of the positive electrode material are avoided, the service life of the material is prolonged, and the safety performance of the material is improved.