Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology (Hong Kong) Limited

Qifeng Li

Na Liu

Changlong Han

Zhiqiang Li

Qilan Zhang

Long Wang

Wei Liang

Dingshan Ruan

The present application discloses a positive electrode active material, a positive electrode plate, a lithium-ion secondary battery, and an apparatus. The positive electrode active material satisfies a chemical formula Li(NiCoMn)MOA, wherein M is one or more selected from Zr, Sr, B, Ti, Mg, Sn and Al, A is one or more selected from S, N, F, Cl, Br and I, −0.01≤x≤0.2, 0.12≤b/c≤0.9, 0.002≤b×c/a≤0.23, a+b+c=1, 0≤d≤0.1, and 0≤y<0.2; and an interval particle size distribution curve of the positive electrode active material has a full width at half maximum Dof from 4 μm to 8 μm. The positive electrode active material provided in the present application has relatively low cobalt content and relatively high cycle life and capacity performance.

Positive electrode active material, positive electrode plate, lithium-ion secondary battery, and apparatus

The present application discloses a positive electrode active material, a positive electrode plate, a lithium-ion secondary battery, and an apparatus. The positive electrode active material satisfies a chemical formula Li(NiCoMn)MOA, wherein M is one or more selected from Zr, Sr, B, Ti, Mg, Sn and Al, A is one or more selected from S, N, F, Cl, Br and I, −0.01≤x≤0.2, 0.12≤b/c≤0.9, 0.002≤b×c/a≤0.23, a+b+c=1, 0≤d≤0.1, and 0≤y≤0.2; and an interval particle size distribution curve of the positive electrode active material has a full width at half maximum Dof from 4 μm to 8 μm. The positive electrode active material provided in the present application has relatively low cobalt content and relatively high cycle life and capacity performance.

A lithium-ion secondary battery and related preparation method thereof, battery module, battery pack and apparatus. The lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate, an electrolyte and a separator, wherein the positive electrode plate includes a positive electrode current collector and a first positive electrode active material layer and a second positive electrode active material layer sequentially disposed on at least one side of the positive electrode current collector; the lithium-ion secondary battery satisfies: −1≤log(u/v)×w≤15.5, wherein, u is a thickness of the first positive electrode active material layer in microns, v is a thickness of the second positive electrode active material layer in microns, w is a conductivity of the electrolyte at a temperature of 25° C. in mS·cm. The lithium-ion secondary battery has excellent performance such as low discharge resistance at low SOC and low gas production at high temperature.

Lithium-ion secondary battery and related preparation method thereof, battery module, battery pack and apparatus

The present application discloses a positive electrode plate, a method for preparation thereof, and related lithium-ion secondary battery, electric vehicle and electronic product. The positive electrode plate includes a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector, the positive electrode film includes a positive active material which is a lithium manganese-based positive active material; and wherein the volume resistivity &#x3c1;of the positive electrode plate, the powder volume resistivity &#x3c1; of the positive active material under a pressure of 20 MPa and the mass percentage a of the positive active material in the positive electrode film satisfy &#x3c1;/&#x3c1;&#x2264;3.

Positive electrode plate, method for preparing the same and lithium-ion secondary battery

The present application discloses a positive electrode plate, a preparation method thereof, and a lithium-ion secondary battery, wherein the positive electrode plate includes a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film includes a positive active material which is a lithium manganese-based positive active material; and wherein the volume resistivity &#x3c1;of the positive electrode plate, the powder volume resistivity &#x3c1; of the positive active material under a pressure of 20 MPa and the mass percentage a of the positive active material in the positive electrode film satisfy &#x3c1;/&#x3c1;&#x2264;3. The positive electrode plate provided in the present application enables the lithium-ion secondary battery to simultaneously have higher safety performance, rate performance and cycle performance.

The present application relates to the technical field of Li-ion battery and, more particularly, to a positive electrode material for a Li-ion battery, a method for preparing the same, and a Li-ion battery containing the same. The positive electrode material for a Li-ion battery includes a substrate material and a coating layer coated on a surface of the substrate material, wherein the coating layer includes boron, a chemical formula of the substrate material is LiNiCoMnO, wherein 0.99&#x3c;x&#x2264;1.1, 0.3&#x3c;a&#x3c;0.9, 0.1&#x3c;b&#x3c;0.4, 0.1&#x3c;c&#x3c;0.4, and a+b+c=1; and the substrate material consists of a large particle substrate material and a small particle substrate material. In the present application, by gradation of large particles and small particles, the pellet density, the capacity density, the room-temperature cycle performance, the high-temperature cycle performance and low temperature discharging performance of the Li-ion battery are improved.

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Ningde, China

Qifeng Li