US 12,255,334 B2
Electrochemical device and electronic device
Kefei Wang, Fujian (CN); and Liang Shi, Fujian (CN)
Assigned to Ningde Amperex Technology Limited, Ningde (CN)
Filed by Ningde Amperex Technology Limited, Fujian (CN)
Filed on Sep. 14, 2021, as Appl. No. 17/475,062.
Application 17/475,062 is a continuation of application No. PCT/CN2021/079031, filed on Mar. 4, 2021.
Prior Publication US 2022/0123319 A1, Apr. 21, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/625 (2013.01) [H01M 4/623 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electrochemical device, comprising: a positive electrode, a negative electrode, and an electrolytic solution;
wherein the negative electrode comprises a negative current collector and a negative active material layer formed on the negative current collector, and the negative active material layer contains a negative active material;
a conductive material is disposed between the negative active material layer and the negative current collector, and an average particle diameter of the conductive material is smaller than that of the negative active material;
a weight per unit area of the negative active material layer is W mg/cm2, wherein W is within a range of 3 to 12; and
a tensile strength of the negative current collector is F N/mm2, wherein F is greater than or equal to 400 and 100/3≤F/W≤150;
and wherein a part of the negative active material layer is sandwiched in the conductive material, and the conductive material is located in a region within 3 μm below a surface of the negative current collector; wherein, in the region, a content of the part of the negative active material sandwiched in the conductive material, based on a total volume of solid content materials, is greater than 0 and less than 10 vol %.
 
13. An electronic device, comprising an electrochemical device, comprising: a positive electrode, a negative electrode, and an electrolytic solution;
wherein the negative electrode comprises a negative current collector and a negative active material layer formed on the negative current collector, and the negative active material layer contains a negative active material;
a conductive material is disposed between the negative active material layer and the negative current collector, and an average particle diameter of the conductive material is smaller than that of the negative active material;
a weight per unit area of the negative active material layer is W mg/cm2, wherein W is within a range of 3 to 12; and
a tensile strength of the negative current collector is F N/mm2, wherein F is greater than or equal to 400 and 100/3≤F/W≤150;
and wherein a part of the negative active material layer is sandwiched in the conductive material, and the conductive material is located in a region within 3 μm below a surface of the negative current collector; wherein, in the region, a content of the part of the negative active material sandwiched in the conductive material, based on a total volume of solid content materials, is greater than 0 and less than 10 vol %.