BEIJING EASPRING MATERIAL TECHNOLOGY CO., LTD.

Provided is a cathode active material including lithium iron phosphate. A number-based particle size distribution curve of the primary particles has the first to third characteristic peaks. A peak position D 1 of the first characteristic peak is from 100 nm to 300 nm, and a number percentage N 1 corresponding to the peak position D 1 of the first characteristic peak ranges from 25% to 35%. A peak position D 2 of the second characteristic peak of the primary particles is from 320 nm to 400 nm, and a number percentage N 2 corresponding to the peak position D 2 of the second characteristic peak ranges from 4% to 9%. A peak position D 3 of the third characteristic peak of the primary particles is from 450 nm to 620 nm, and a number percentage N 3 corresponding to the peak position D 3 of the third characteristic peak ranges from 0.5% to 2%.

The present disclosure relates to the technical field of preparation of a lithium-ion cathode material, and discloses a lithium manganese iron phosphate cathode material and a preparation method thereof, a manganese iron phosphate precursor and a preparation method thereof, and a lithium-ion battery. The cathode material has a composition represented by Formula I: Li d Mn 1-a-b-c Fe a R b PO 4 /C, Formula I, where 0.1≤a≤0.5, 0≤b≤0.08, 0.9≤d≤1.2, and R is selected from at least one of Al, Mg, Ca, Sr, V, Cr, Y, Mo, Nb, B, Al, W, La, Sm, Co, Ni, Cu, Zn, Zr, and Ti. The cathode material has a volume resistivity ranging from 10 Ω·cm to 10 4 Ω·cm. The cathode material includes specific doping elements and has a low volume resistivity. When the cathode material is used to prepare the lithium-ion battery, electrochemical performance of the lithium-ion battery can be effectively improved.

Provided are a single crystal multi-element cathode material, a preparation method thereof, and a lithium-ion battery. The multi-element cathode material includes quasi single crystal particles each consisting of a plurality of crystal grains, and element G is present at grain boundaries between the plurality of crystal grains. A concentration of the element G at a g-site of the grain boundaries gradually decreases with an increase in a distance between the g-site and a surface of the quasi single crystal particles. The element G is selected from at least one of Ni, Co, Mn, Ta, Cr, Mo, W, La, Al, Y, Ti, Zr, V, Nb, Ce, Er, and B.

Provided are a NASICON-type solid-state electrolyte, and a preparation method and application thereof. The NASICON-type solid-state electrolyte includes Li x M1 y M2 z M3 u M4 v (PO 4 ) w1 (PS 4 ) w2 , where: y+z+u+v=2, w1+w2=3, 0<x<5, 0≤y≤0.5, 0<z≤1, 0<u<2, 0≤v≤3, and 1<w 1 ≤3; M1 includes at least one of Mg, Na, K, or Zn; M2 includes at least one of Al, Ga, In, Y, Sc, La, or Ce; M3 includes at least one of Ti, Zr, Hf, or Ge; and M4 includes at least one of Cr, Mo, Ca, Fe, Si, W, Nb, Sm, V, or B.

The present disclosure relates to a cathode active material, a preparation method therefor, a cathode plate, a battery, and an electric device. The cathode active material is an iron-based sulfate cathode material for the sodium-ion battery. An X-ray diffraction pattern of the cathode active material has a first characteristic peak in a range from 34.9° to 35.3° and a second characteristic peak in a range from 35.3° to 35.5°. A peak intensity I 1 of the first characteristic peak and a peak intensity I 2 of the second characteristic peak satisfy: 1.1≤I 1 /I 2 ≤1.5. When the cathode active material satisfies the above condition, it indicates that Fe in the cathode active material exists mainly in the form of Fe 2+ and that a mass percentage of Fe 3+ in the material is smaller than 1.5%.

The present disclosure discloses provides a solid-state electrolyte material and a preparation method thereof, a cathode active material, a cathode plate, and a solid-state battery. The solid-state electrolyte has a NASICON crystal structure. In an X-ray diffraction pattern of the solid-state electrolyte material, the solid-state electrolyte material has a characteristic diffraction peak exhibit at a diffraction angle 2θ values of 14.5° to 14.8°, a characteristic diffraction peak at a diffraction angle 2θ value of 19.5° to 19.7°, and a characteristic diffraction peak at a diffraction angle 2θ value of 22.5° to 22.8°. A ratio of a peak intensity I 1 of the characteristic diffraction peak at a 2θ value of 14.5° to 14.8° to a peak intensity I 2 of the characteristic diffraction peak at a 2θ value of 22.5° to 22.8° satisfies: 1.5≤I 2 /I 1 ≤3. Thus, an ionic conductivity and structural stability of the solid-state electrolyte are improved.

The present disclosure provides a solid-state electrolyte material and a preparation method thereof, a cathode active material and a preparation method thereof, a cathode plate, a battery, and an electrical device, which are related to the field of battery technologies. The solid-state electrolyte material has a NASICON crystal structure. In an X-ray diffraction pattern of the solid-state electrolyte material, a 2θ value of a diffraction peak representing LiTi 2 (PO 4 ) 3 is decreased by 0.02° to 0.06° compared with a 2θ value of a corresponding diffraction peak in a standard pattern of LiTi 2 (PO 4 ) 3 . Thus, use of the solid-state electrolyte material enables a battery loaded with the solid-state electrolyte material to have excellent rate performance.

Provided are a cathode active material and a preparation method thereof, a positive electrode plate, a battery, and an electrical device. The present disclosure relates to the technical field of batteries. A change An in a content of Fe 2+ in the cathode active material satisfies Δn≥0.1 and Δn=n1−n2; n1 is a content of Fe 2+ in the cathode active material prior to charging, and n2 is a content of Fe 2+ in the cathode active material when charging to 4.0 V; and the content of Fe 2+ =amount of Fe 2+ substance in the cathode active material/(the amount of Fe 2+ substance in the cathode active material+amount of Fe 3+ substance in the cathode active material). Therefore, by using the cathode active material, a battery loaded with the cathode active material can have excellent energy density.

The present disclosure belongs to the technical field of batteries, and specifically discloses a cathode material and a preparation method thereof, a lithium-ion battery, and an electrical device. The cathode material satisfies: 1.5<Kn 90 =(Ln 90 −Ln 10 )/Ln 50 <4.5; 0<Ln 10 <2000 Å; Ln 10 <Ln 50 <3000 Å; and Ln 50 <Ln 90 <15000 Å.

The present disclosure relates to the technical field of lithium-ion batteries, and particularly, to a multi-element cathode material, a preparation method thereof, a positive electrode plate, and a lithium-ion battery. The multi-electrode material is composed of secondary particles agglomerated by primary particles. A ratio of a total cross-sectional area of the primary particles with more than 5 grain boundaries to a cross-sectional area of the secondary particles is greater than or equal to 3:4. A porosity on a cross-section of the secondary particles is less than or equal to 2%. A grain boundary is a contour line of an interface between the primary particles with the same structure but different orientations on the cross-section of the secondary particles and a length of the grain boundary is greater than or equal to 0.1 μm.