Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology (hong Kong) Limited

Contemporary Amperex Technology Limited

Yuliang Shen

Libing He

Meng Kang

Jiazheng Wang

Tianquan Peng

Xiaobin Dong

Lei Chen

Baojian Zhu

Qiqi Zuo

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.

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

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

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%.

The present invention provides a negative electrode plate and a battery. The negative electrode plate comprises a negative current collector and a negative film that is provided on at least one surface of the negative current collector and comprises a negative active material. The negative film meets the follow relations: 6.0&#x2264;PD&#xd7;Dv50&#x2264;32.0 and 0.2&#x2264;PD/Dn10&#x2264;12.0. The negative electrode plate of the present invention has excellent dynamic performance, and the battery of the present invention has both excellent dynamic performance and long cycle life.

Negative electrode and battery

The present application provides a negative electrode sheet and a battery. The negative electrode sheet includes a negative current collector and a negative electrode film provided on at least one surface of the negative current collector and including a negative active material, and the negative electrode film satisfies: 4&#x2264;P&#xd7;[(30&#x2212;Dv50)/2+2&#xd7;(10&#x2212;M)]&#x2264;20. P represents a porosity of the negative electrode film; Dv50 represents a volume median particle diameter of the negative active material, and a unit is &#x3bc;m; M represents a capacity per unit area of a negative electrode film, and a unit is mAh/cm. The negative electrode sheet of the present application has the characteristics of excellent dynamics performance, and the battery of the present application also has the characteristics of excellent dynamics performance, long cycle life and high energy density at the same time.

Negative electrode sheet and battery

The present disclosure provides a negative electrode plate and a battery, the negative electrode plate comprises a negative current collector and a negative film, the negative film is provided on at least one surface of the negative current collector and comprises a negative active material, the negative active material comprises graphite, and the negative electrode plate satisfies a relationship: 0.27&#x2264;P&#xd7;1.1/G+2/V&#x2264;1.3, P represents a porosity of the negative film, G represents a graphitization degree of the negative active material, Vrepresents an OI value of the negative film. The battery of the present disclosure can have the characteristics of long cycle life, high energy density and excellent dynamics performance at the same time.

Negative electrode plate and battery

The present disclosure provides a secondary battery, the secondary battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the positive electrode plate comprises a positive current collector and a positive film, the positive film is provided on at least one surface of the positive current collector and comprises a positive active material, the negative electrode plate comprises a negative current collector and a negative film, the negative film is provided on at least one surface of the negative current collector and comprises a negative active material, the negative active material comprises graphite, and an average particle diameter of the positive active material represented by D50 and a thickness of the negative film represented by Hsatisfy a relationship: 6&#x2264;0.06H&#xd7;(4&#x2212;1/D50)&#x2264;31. The battery of the present disclosure has the characteristics of excellent dynamics performance and long cycle life at the same time.

Secondary battery

The present disclosure provides a battery and a testing method of an active specific surface area of an electrode plate. The battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the negative electrode plate comprises a negative current collector and a negative film, the negative film is provided on at least one surface of the negative current collector and comprises a negative active material, the negative active material comprises graphite, and an active specific surface area of the negative electrode plate is 1 cm/g&#x2dc;15 cm/g. In the present disclosure, by reasonably controlling the active specific surface area of the negative electrode plate can make the battery have the characteristics of high energy density and excellent dynamics performance at the same time.

Negative electrode plate, testing method of active specific surface area of electrode plate, battery

The present application provides a method for determining fast charge performance of a negative electrode plate and a method for designing a negative electrode plate. By utilizing the method(s) according to the present application, the charging speed of a negative electrode plate can be quickly evaluated and the design period of a negative electrode plate in a fast charge battery can be greatly shortened.

Method for determining fast charge performance of a negative electrode plate and method for designing a negative electrode plate

The present disclosure provides a negative electrode plate and a battery, the negative electrode plate comprises a negative current collector and a negative film, the negative film is provided on at least one surface of the negative current collector and comprises a negative active material. The negative active material comprises graphite, and an OI value of the negative film represented by Vand a pressing density of the negative film represented by PD satisfy a relationship: 0.7&#x2264;(80/V+43/PD)&#xd7;PD/V&#x2264;21.5, where a unit of the pressing density of the negative film represented by PD is g/cm. The battery of the present disclosure can have the characteristics of fast charging speed, high energy density, good safety performance and long cycle life at the same time.

The disclosure relates to a secondary battery comprising a negative electrode plate the same. Specifically, the present disclosure provides secondary battery, comprising a negative electrode plate, the negative electrode plate comprises a negative electrode current collector and a negative electrode layer coated on at least one surface of the negative electrode current collector, the negative electrode layer comprising a negative electrode active material, wherein the negative electrode active material comprises a graphite material, and the negative electrode layer fulfills the condition: 0.75&#x2264;7.8/D50+1.9*D50/(V)&#x2264;2.0, wherein D50 represents a volume distribution average particle diameter of particles of the negative electrode active material in micron; Vrepresents the OI value of the negative electrode layer. The secondary battery has the combination of high energy density, fast charge, and long cycle life.

Negative electrode plate and secondary battery comprising the same

The present application provides a negative electrode sheet and a secondary battery. The negative electrode sheet includes a negative current collector and a negative electrode film provided on at least one surface of the negative current collector and comprising a negative active substance. The negative electrode sheet also satisfies: 0.3&#x2264;a&#xd7;(1.1/b+0.02&#xd7;c)&#x2264;6.0, where a represents the specific surface area of the negative electrode film, and the unit is m/g; b represents the compaction density of the negative electrode film, and the unit is g/cm; c represents the cohesive force between the negative electrode film and the negative current collector, and the unit is N/m. The present application can make the negative electrode sheet have excellent dynamics performance, and meanwhile ensure that the secondary battery has good dynamics performance and cycle performance without sacrificing energy density.

Negative electrode sheet and secondary battery

The present disclosure provides a secondary battery, the secondary battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the negative electrode plate comprises a negative current collector and a negative film, the negative film is provided on at least one surface of the negative current collector and comprises a negative active material. The secondary battery satisfies relationships 3.9&#x2264;G&#xd7;3.5+2.8/CB&#x2264;6.2 and 1.23&#x2264;0.55/V+CB&#xd7;1.2&#x2264;2.80 at the same time. The battery of the present disclosure has the characteristics of high energy density and excellent dynamics performance, and the battery of the present disclosure also has the characteristic of long cycle life while charged under a large rate and a fast speed.

The disclosure relates to a negative electrode plate and a secondary battery comprising the same. Specifically, the present disclosure provides a negative electrode plate comprising a negative electrode current collector and a negative electrode layer coated on at least one surface of the negative electrode current collector, the negative electrode layer comprising a negative electrode active material, wherein the negative electrode active material comprises a graphite material, and the negative electrode layer fulfills the condition: 0.45&#x2264;7.8/D50+1.9*D50/(V)&#x2264;3.1, wherein D50 represents a volume distribution average particle diameter of particles of the negative electrode active material in micron; Vrepresents the OI value of the negative electrode layer. The negative electrode plate can allow that a secondary battery containing the same has the combination of high energy density, fast charge, and long cycle life.

The disclosure relates to a negative electrode plate and a secondary battery comprising the same. Specifically, the disclosure provides a negative electrode plate comprising a negative electrode current collector and a negative electrode layer coated on at least one surface of the negative electrode current collector, the negative electrode layer comprising a negative electrode active material, wherein the negative electrode active material comprises graphite, and the negative electrode layer meets: 4&#xd7;L&#xd7;V&#x2212;&#xbc;&#xd7;Dn10&#x2264;25, wherein L represents the thickness of single-side negative electrode layer on the negative electrode current collector in millimeter; Dn10 represents the particle diameter corresponding to 10% of the number distribution of particles of the negative electrode active material in micrometer; Vrepresents the orientation index of the negative electrode layer. The negative electrode plate can allow that a secondary battery containing the same has the combination of high energy density, fast charge, and long cycle life.

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Ningde, China

Yuliang Shen