Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology (Hong Kong) Limited

Contemporary Amperex Technology Limited

Mingling Li

Qisen Huang

Xin Liu

Jia Peng

Xianghui Liu

Cheng Li

Chengdu Liang

Shiwen Wang

Changliang Sheng

Meng Qin

A negative electrode composite current collector including a copper plating solution is described. The copper plating solution includes a leveling agent represented by a general formula (1)

Copper plating solution and negative electrode composite current collector prepared using same

This application discloses a negative current collector, a negative electrode plate, an electrochemical apparatus, a battery module, a battery pack, and a device. The negative current collector includes a support layer and a metal conductive layer that is disposed on at least one of two opposite surfaces of the support layer in a thickness direction of the support layer. A density of the support layer is less than a density of the metal conductive layer; and the density of the metal conductive layer is 8.0 g/cmto 8.96 g/cm. A thickness Dof the metal conductive layer is 300 nm≤D≤2 μm. When a tensile strain of the negative current collector is 2.5%, a sheet resistance growth rate T of the metal conductive layer is T≤5%.

Negative current collector, negative electrode plate, electrochemical apparatus, battery module, battery pack, and device

A positive electrode current collector and a positive electrode plate, a battery, a battery module, a battery pack, and an apparatus including the positive electrode current collector are provided. In some embodiments, a positive electrode current collector is provided, including an organic support layer and an aluminum-based conductive layer disposed on at least one surface of the organic support layer, where the aluminum-based conductive layer contains Al and at least one modifying element selected from O, N, F, B, S, and P, an XPS spectrogram of the aluminum-based conductive layer with a surface passivation layer removed through etching has at least a first peak falling in a range of 70 eV to 73.5 eV and a second peak falling in a range of 73.5 eV to 78 eV, and a ratio x of peak intensity of the second peak to that of the first peak satisfies 0<x≤3.0.

Positive electrode current collector and positive electrode plate, battery, battery module, battery pack, and apparatus containing such positive electrode current collector

This application provides a copper plating solution for a composite current collector, including a leveling agent represented by a general formula (1)

A positive current collector, a secondary battery, and an electrical device are provided. In some embodiments, the positive current collector includes: a support layer; and a conductive layer located on at least one surface of the support layer, where the conductive layer includes a first metal portion configured to connect to a tab, where, along a thickness direction of the conductive layer, the first metal portion includes at least three sublayers, and melting points of the at least three sublayers rise stepwise in ascending order of distance from the support layer. In the embodiments of this application, the first metal portion includes at least three sublayers, and the melting points of the at least three sublayers rise stepwise in ascending order of distance from the support layer, thereby helping increase a bonding force between the conductive layer and the support layer and reducing the probability of peel-off and delamination between the layers.

Positive current collector, secondary battery, and electrical device

This application provides a current collector and a preparation method thereof, a secondary battery containing such current collector, a battery module, a battery pack, and an electric apparatus. The current collector in this application includes a support layer, a binder layer, and a metal layer, where the binder layer is arranged between the support layer and the metal layer, the binder layer includes an organic binder and inorganic particles, a thickness Dof the binder layer is 1.0-5.0 &#x3bc;m, optionally 1.0-3.0 &#x3bc;m; and the inorganic particles include large particles with a median particle size Dand small particles with a median particle size D, and the median particle sizes of the large particles and the small particles satisfy the following relationships: D&#x3e;D; D=(0.5-0.9)&#xd7;D; and D=(0.1-0.4)&#xd7;D.

Current collector and preparation method thereof, secondary battery, battery module, battery pack, and electric apparatus

A positive electrode current collector and a positive electrode plate, a battery, a battery module, a battery pack, and an apparatus including the positive electrode current collector are provided. In some embodiments, a positive electrode current collector is provided, including an organic support layer and an aluminum-based conductive layer disposed on at least one surface of the organic support layer, where the aluminum-based conductive layer contains Al and at least one modifying element selected from O, N, F, B, S, and P, an XPS spectrogram of the aluminum-based conductive layer with a surface passivation layer removed through etching has at least a first peak falling in a range of 70 eV to 73.5 eV and a second peak falling in a range of 73.5 eV to 78 eV, and a ratio x of peak intensity of the second peak to that of the first peak satisfies 0&#x3c;x&#x2264;3.0.

This application discloses a lithium-ion secondary battery. The lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolytic solution. The positive electrode plate includes a positive electrode current collector and a positive active material layer disposed on a surface of the positive electrode current collector and containing a positive active material, and the negative electrode plate includes a negative electrode current collector and a negative active material layer disposed on a surface of the negative electrode current collector and containing a negative active material; wherein the positive active material includes lithium iron phosphate, and the negative active material includes graphite; and wherein the positive electrode current collector and/or the negative electrode current collector is a composite current collector, and the composite current collector includes an organic support layer and a conductive layer disposed on at least one surface of the organic support layer.

Lithium-ion secondary battery

The present disclosure provides a lithium ion secondary battery, a battery core, a negative electrode plate and an apparatus containing the lithium ion secondary battery. The lithium ion secondary battery includes a battery core and an electrolytic solution, the battery core including a positive electrode plate comprising a positive current collector and a positive active material layer, a separator, and a negative electrode plate comprising a negative current collector and a negative active material layer, wherein the positive current collector and/or the negative current collector are a composite current collector, the composite current collector comprises a polymer-based support layer and a conductive layer disposed on at least one surface of the support layer, and the composite current collector has a thermal conductivity in a range of 0.01 W/(m&#xb7;K) to 10 W/(m&#xb7;K), preferably in a range of 0.1 W/(m&#xb7;K) to 2 W/(m&#xb7;K).

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Ningde, China

Mingling Li