Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology (hong Kong) Limited

Contemporary Amperex Technology Limited

Qi Wu

Qisen Huang

Jinhua He

Yao Jiang

Chunhua Hu

Shushi Dou

Bin Deng

Changyin Ji

Na Liu

Liangbin Liu

Tao Qiao

Dong Zhao

Qiang Chen

Jingpeng Fan

Jing Wang

Kelun Wang

Tao Huang

This application discloses a positive electrode active material, including bulk particles and a coating layer applied on an exterior surface of each of the bulk particles, where the bulk particle includes a lithium composite oxide that contains element nickel and a doping element M, and the coating layer includes an oxide of element M. When the positive electrode active material is in a 11% delithiated state, average valences of element Mand Mare αand β, respectively; when the positive electrode active material is in a 78% delithiated state, average valences of element Mand Mare αand β, respectively; and α>α, β=β. Element Mincludes one or more of Si, Ti, Cr, Mo, V, Se, Nb, Ru, Rh, Pd, Sb, Te, Ce, and W, and element Mis selected from one or more of Mg, Al, Ca, Zr, Zn, Y, and B.

Positive electrode active material and preparation method thereof, positive electrode plate, lithium-ion secondary battery, and apparatus containing such lithium-ion secondary battery

A positive electrode active material and a preparation method thereof, a positive electrode plate, a lithium-ion secondary battery, and a battery module, a battery pack, and apparatus containing the lithium-ion secondary battery are provided. The positive electrode active material includes secondary particles formed by agglomeration of primary particles, where the primary particles include a layered nickel-containing lithium composite oxide, and the nickel-containing lithium composite oxide includes a doping element; and when the positive electrode active material is charged from an 11% delithiated state to a 78% delithiated state at a rate of 0.1 C, a lattice of the primary particles has a maximum shrinkage rate satisfying Δa≤3.00% in an a-axis direction, and a maximum swelling rate satisfying Δc≤3.02% in a c-axis direction.

Positive electrode active material and preparation method thereof, positive electrode plate, lithium-ion secondary battery, and battery module, battery pack, and apparatus containing such lithium-ion secondary battery

A positive electrode active material and a preparation method thereof, a positive electrode plate, a lithium-ion secondary battery, and a battery module, battery pack, and apparatus containing such lithium-ion secondary battery are provided. The positive electrode active material includes matrix particles and a coating layer covering an exterior surface of the matrix particle, where the matrix particle includes a lithium nickel cobalt manganese oxide, and the coating layer includes an oxide of element M; the matrix particle is doped with element Mand element M, element Min the matrix particle is uniformly distributed, and element Min the matrix particle has a decreasing concentration from the exterior surface to a core of the matrix particle; and element Mand element Mare each independently selected from one or more of Mg, Al, Ca, Ba, Ti, Zr, Zn, and B, and element Mincludes one or more of Si, Ti, Cr, Mo, V, Ge, Se, Zr, Nb, Ru, Rh, Pd, Sb, Te, Ce, and W.

This application discloses a positive electrode active material, including secondary particles and a coating layer applied on an exterior surface of each of the secondary particles, where the secondary particle includes a lithium transition metal oxide that contains a doping element M, the coating layer includes an oxide of element M, Mis selected from one or more of Si, Ti, Cr, Mo, V, Ge, Se, Zr, Nb, Ru, Rh, Pd, Sb, Te, Ce, and W, and Mis selected from one or more of Mg, Al, Ca, Ce, Ti, Zr, Zn, Y, and B; a relative deviation of local mass concentration of element Min the secondary particle is less than 20%; and the secondary particle from the core to the exterior surface of the particle includes a plurality of layers of primary particles arranged along radial direction of the secondary particle.

A positive electrode active material and a preparation method thereof, a secondary battery, and an electric apparatus are provided. The positive electrode active material in the present invention includes: a core, where the core is a lithium-containing phosphate; a first coating layer disposed on at least part of surface of the core, where the first coating layer is a carbon coating layer co-doped with titanium and nitrogen; and a second coating layer disposed on at least part of surface of the first coating layer, where the second coating layer includes LiMTi(PO), where M is at least one element selected from aluminum, lanthanum, indium, zirconium, gallium, and scandium, and 0.2≤x≤0.8. With use of the positive electrode active material of the present invention, a high discharge capacity, excellent rate performance, and excellent cycling performance can be achieved.

Positive electrode active material and preparation method thereof, secondary battery, and electric apparatus

The present application discloses a positive electrode active material including a lithium nickel cobalt manganese oxide, the molar content of nickel in the lithium nickel cobalt manganese oxide accounts for 60%-90% of the total molar content of nickel, cobalt and manganese, and the lithium nickel cobalt manganese oxide has a layered crystal structure of a space group Rm; a transition metal layer of the lithium nickel cobalt manganese oxide includes a doping element, and the local mass concentration of the doping element in particles of the positive electrode active material has a relative deviation of 20% or less; and in a differential scanning calorimetry spectrum of the positive electrode active material in a 78% delithiation state, an initial exothermic temperature of a main exothermic peak is 200&#xb0; C. or more, and an integral area of the main exothermic peak is 100 J/g or less.

Positive electrode active material, method for preparation thereof, positive electrode plate, lithium-ion secondary battery and related battery module, battery pack and apparatus

This application provides a positive active material and a preparation method thereof, an electrochemical battery, a battery module, a battery pack, and an apparatus. The positive active material includes an inner core and a coating layer, where the coating layer coats a surface of the inner core. The inner core is selected from a ternary material with a molecular formula of Li[NiCoMnMM']OY, where distribution of each of the doping elements M, M&#x2032;, and Y in the inner core meets the following condition: there is a reduced mass concentration gradient from an outer side of the inner core to a center of the inner core. The positive active material herein features high gram capacity, high structural stability, and high thermal stability, so that the electrochemical battery has excellent cycle performance and storage performance and high initial discharge gram capacity.

Positive active material and preparation method thereof, electrochemical battery, battery module, battery pack, and apparatus

The present application discloses positive electrode active material, preparation method thereof, positive electrode plate, lithium-ion secondary battery and battery module, pack, and apparatus. The positive electrode active material includes a nickel-containing lithium composite oxide satisfying a chemical formula Li[NiCoMnM]O, in the formula, M is a doping element at transition metal site, 0.5&#x2264;x&#x3c;1, 0&#x2264;y&#x3c;0.3, 0&#x2264;z&#x3c;0.3, &#x2212;0.1&#x2264;a&#x3c;0.2, 0&#x3c;b&#x3c;0.3, x+y+z+b=1, wherein the positive electrode active material has a layered crystal structure and belongs to space group Rm; under the condition that the positive electrode active material is in 78% delithiation state, at least part of the doping elements M have a chemical valence of +3 or more, and surface oxygen of the positive electrode active material has an average valence state of Vsatisfying &#x2212;2.0&#x2264;V&#x2264;&#x2212;1.5.

Positive electrode active material, preparation method thereof, positive electrode plate, lithium-ion secondary battery as well as battery module, battery pack and apparatus containing lithium-ion secondary battery

The present disclosure relates to a ternary positive electrode material and a battery using the ternary positive electrode material. The ternary positive electrode material includes secondary particles composed of primary particles. The secondary particles have an average particle diameter D50 of 6 &#x3bc;m-20 &#x3bc;m, BET of 0.2 m/g-1 m/g, and the number &#x3c3; of primary particles per unit area of the secondary particles is 5 particles/&#x3bc;m-100 particles/&#x3bc;m. The ternary positive electrode material has a formula of Li[NiCoMnM1M2]ON, where element M1 and element M2 are each independently selected from at least one of Al, Zr, Ti, Mg, Zn, B, Ca, Ce, Te and Fe, element N is selected from at least one of F, Cl and S, and 0&#x3c;x&#x3c;1, 0&#x3c;y&#x2264;0.3, 0&#x2264;z&#x2264;0.3, &#x2212;0.1&#x3c;a&#x3c;0.2, 0&#x2264;b&#x3c;0.3, 0&#x2264;c&#x3c;0.3, 0&#x2264;d&#x3c;0.2, 0&#x2264;b+c&#x2264;0.3, x+y+z+b=1. The formed secondary particles have high compactness, thereby effectively improving the structural stability and the cycling performance at high or low temperature.

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Ningde, China

Qi Wu