Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology (hong Kong) Limited

Contemporary Amperex Technology Co., Limted

Contemporary Amperex Technology Limited

Libing He

Meng Kang

Jiazheng Wang

Yuliang Shen

Xiaobin Dong

Rui Shen

Jianjun Ma

Tianquan Peng

Baida Deng

Erling Li

Lei Chen

Baojian Zhu

Yuqun Zeng

Yuanyuan Li

Liangbin Liu

Chen Zeng

Qiqi Zuo

Zilong Song

Xieji Lin

Shuli Li

Jiangun Ma

A method for preparing a modified graphite includes performing crushing on coal-based needle coke to obtain a first material, performing shaping fine powder removal on the first material to obtain a second material, performing heat treatment on the second material in a reaction kettle and then cooling the second material after the heat treatment to room temperature to obtain a third material, and performing graphitization on the third material in a graphitization furnace and then cooling the third material after the graphitization to room temperature to obtain the modified graphite.

Method for preparing modified graphite, secondary battery, battery module, battery pack and power consuming device

The present application provides a carbon material, a method for preparing the same, and a secondary battery and an electrical device comprising the same. The carbon material includes a pore structure, wherein the carbon material has 3R and 2H phases and satisfies 0<I/I≤0.100, in which Iis the diffraction peak intensity of 101 crystallographic plane of the 3R phase in the X-ray diffraction pattern of the carbon material, and Iis the diffraction peak intensity of 004 crystallographic plane of the 2H phase in the X-ray diffraction pattern of the carbon material. The carbon material provided in the present application can make the secondary battery have high initial columbic efficiency and also good cycling and dynamic performances.

Carbon material, method for preparing the same, and secondary battery and electrical device comprising the same

A secondary battery, a preparation method thereof, and a battery module, a battery pack, and an apparatus containing such secondary battery are provided. In some embodiments, the secondary battery includes a negative-electrode plate, where the negative-electrode plate includes a negative-electrode current collector and a negative-electrode film layer, the negative-electrode film layer includes a first negative-electrode film layer and a second negative-electrode film layer, and the second negative-electrode film layer is located between the negative-electrode current collector and the first negative-electrode film layer; and the first negative-electrode film layer includes a first negative-electrode active material, the first negative-electrode active material includes a first graphite, the first graphite is artificial graphite, and a distribution of volume-based particle size D99 of the first negative-electrode active material is ≤23 μm.

Secondary battery, preparation method thereof, and battery module, battery pack, and apparatus containing such secondary battery

A secondary battery and an electric apparatus are disclosed. The secondary battery includes a negative electrode plate including a negative electrode current collector and a negative electrode film layer with a thickness of H; a first surface away from the negative electrode current collector; and a second surface opposite the first surface. A first region of the negative electrode film layer includes a first active material with a thickness range from the second surface of the negative electrode film layer to 0.3H. The first active material comprises a first silicon-based material, which comprises secondary particles formed by aggregation of primary particles. A second region of the negative electrode film layer comprises a second active material with a thickness range from the first surface of the negative electrode film layer to 0.3H.

Secondary battery and electric apparatus

This application discloses a negative-electrode active material and a preparation method thereof, a secondary battery, and a battery module, a battery pack, and an apparatus that include such secondary battery. The negative-electrode active material includes a core and a coating layer covering at least part of a surface of the core, where the core includes artificial graphite, the coating layer includes amorphous carbon, a volume-based particle size distribution of the negative-electrode active material satisfies D99≤24 μm, a volume-based median particle size D50 of the negative-electrode active material satisfies 8 μm≤D50≤15 μm, D99 is a particle size corresponding to a cumulative volume distribution percentage of the negative-electrode active material reaching 99%, and D50 is a particle size corresponding to a cumulative volume distribution percentage of the negative-electrode active material reaching 50%.

Negative-electrode active material and preparation method thereof, secondary battery, and battery module, battery pack, and apparatus containing such secondary battery

This application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. In particular, the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is comprises a first negative electrode active material, and the particle size uniformity of the first negative electrode active material is from 0.4 to 0.6; the second negative electrode film comprises a second negative electrode active material, and the particle size uniformity of the second negative electrode active material is from 0.25 to 0.45, and a ratio of the particle size uniformity of the first negative electrode active material to the particle size uniformity of the second negative electrode active material is from 1.05 to 1.9.

Secondary battery, process for preparing the same and apparatus containing the secondary battery

The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the same. In particular, the secondary battery comprises a negative electrode plate, and the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is disposed on at least one surface of the negative current collector and comprises a first negative electrode active material; the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, and the second negative electrode active material comprises secondary particles, a number percentage of which is greater than or equal to 20%, wherein the first negative electrode active material comprises natural graphite and the second negative electrode active material comprises artificial graphite.

A composite artificial graphite includes a first graphite and a second graphite. The first graphite includes secondary particles and has a graphite interlayer spacing dof 0.33560 nm to 0.33610 nm. The second graphite includes primary particles and has a graphite interlayer spacing dof 0.33620 nm to 0.33670 nm. A mass percentage of the first graphite in the composite artificial graphite is 40% to 90%.

Composite artificial graphite and preparation method thereof, and secondary battery and power consuming device comprising the composite artificial graphite

This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery secondary battery includes an electrode assembly including a cell and tabs extending from the cell, the cell includes a negative electrode plate, the negative electrode plate includes a negative current collector and a negative electrode film arranged on at least one surfaces of the negative current collector and including a negative active material, wherein the negative active material includes artificial graphite including secondary particles; and the cell satisfies 5 cm≤0.5×√{square root over (a+b)}≤15 cm, and a≤15 cm, wherein a is the maximum size of the cell in the direction that the tabs extend, in cm; and b is the maximum size of the cell in a direction perpendicularly intersecting with the direction that the tabs extend, in cm.

Secondary battery and apparatus containing the same

This application discloses a secondary battery including a positive electrode plate and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode film disposed on a surface of the positive electrode current collector and comprising a positive active material, the negative electrode plate comprises a negative electrode current collector and a negative electrode film disposed on a surface of the negative electrode current collector and comprising a negative active material. The positive active material comprises one or more of layered lithium transition metal oxides and modified compounds thereof, and a resistance R of the negative electrode plate satisfies: 6.0 mΩ≤R≤12.0 mΩ; or the positive active material comprises one or more of lithium-containing phosphates with olivine structure and modified compounds thereof, and a resistance R of the negative electrode plate satisfies: 3.0 mΩ≤R≤7.0 mΩ.

Secondary battery and apparatus containing the secondary battery

This application discloses a negative-electrode active material and a preparation method thereof, a secondary battery, and a battery module, a battery pack, and an apparatus that include such secondary battery. The negative-electrode active material includes a core and a coating layer covering at least part of a surface of the core, where the core includes artificial graphite, the coating layer includes amorphous carbon, a volume-based particle size distribution of the negative-electrode active material satisfies D99≤24 μm, a volume-based median particle size D50 of the negative-electrode active material satisfies 8 μm≤D≤15 μm, D99 is a particle size corresponding to a cumulative volume distribution percentage of the negative-electrode active material reaching 99%, and WO is a particle size corresponding to a cumulative volume distribution percentage of the negative-electrode active material reaching 50%.

The present application relates to a negative electrode plate and a secondary battery. Specifically, the present application provides a negative electrode plate comprising a negative electrode current collector and an negative electrode film coated on at least one surface of the negative electrode current collector and containing the negative active material, wherein the negative electrode plate satisfies 0.6≤0.7×P×(D90−D10)/D50+B/3≤8.0, wherein P refers to the porosity of the negative electrode film; B refers to the active specific surface area of the negative electrode film, and the unit thereof is m/g; D10 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 10%, D90 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 90%, and D50 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 50%.

Negative electrode plate and secondary battery

This application provides a negative electrode plate, including an active layer 1 and an active layer 2. The active layer 1 contains an active material 1, and the active layer 2 contains an active material 2. A powder OI value of the active material 1 falls in a range of 8 to 32, and a powder OI value of the active material 2 falls in a range of 2 to 7. A gram capacity of the active material 1 falls in a range of 290 to 350 mAh/g, and a gram capacity of the active material 2 falls in a range of 350 to 368 mAh/g. A ratio α of the powder OI value between the active material 1 and the active material 2 falls in a range of 2.00 to 6.25.

Negative electrode plate, secondary battery, battery pack, battery module, and electrical device

The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. The negative electrode film of the secondary battery comprises a first negative electrode film and a second negative electrode film; the first negative electrode film is disposed on at least one surface of the negative electrode current collector and comprises a first negative electrode active material; and the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, the first negative electrode active material comprises natural graphite and the first negative electrode active material satisfies: 0.60≤S1≤0.85; and the second negative electrode active material comprises artificial graphite. The secondary battery according to the present application has both better low-temperature rate performance and longer high-temperature cycle life while having a higher energy density.

The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. In particular, the secondary battery comprises a negative electrode plate, and the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is disposed on at least one surface of the negative current collector and comprises a first negative electrode active material, the first negative electrode active material comprises graphite; the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, the second negative electrode active material comprises artificial graphite, and the second negative electrode active material comprises secondary particles, the number percentage of which is greater than or equal to 20%.

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Ningde, China

Libing He