Electrochemical device and electronic device
An electrochemical and conductive layer technology, applied in the field of electrochemical energy storage, can solve the problems of dislocation and peeling between the active material layer and the current collector, affecting the safety performance and cycle performance of the electrochemical device, and achieve the effect of improving the extension deformation
Active Publication Date: 2021-07-09
NINGDE AMPEREX TECH
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This leads to the elongation and deformation of the current collector in the pole piece in the X and Y directions in its plane coordinate system, and may also cause dislocati
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Abstract
Embodiments of the invention provide an electrochemical device and an electronic device. The electrochemical device comprises a first pole piece which comprises a current collector and an active material layer, wherein he current collector comprises a first base material and a second base material which are stacked; the second base material is arranged between the first base material and the active material layer; and the tensile strength Rm1 of the first base material and the tensile strength Rm2 of the second base material meet the condition that Rm1-Rm2 is larger than or equal to 100 MPa and smaller than or equal to 400 MPa. According to the embodiment of the invention, the current collector comprising the first base material and the second base material is adopted, so the extension deformation of the pole piece can be inhibited and the demolding problem of the active material layer can be improved at the same time.
Description
technical field [0001] The present application relates to the field of electrochemical energy storage, in particular to electrochemical devices and electronic devices. Background technique [0002] Electrochemical devices (such as lithium-ion batteries) have swelling during cycling, especially the active material layer in the pole piece expands significantly during cycling. This leads to the extensional deformation of the current collector in the pole piece in the X and Y directions in its plane coordinate system, and may also lead to dislocation and peeling between the active material layer and the current collector, which greatly affects the safety performance of the electrochemical device. and cycle performance. SUMMARY OF THE INVENTION [0003] Embodiments of the present application provide an electrochemical device including a first pole piece including a current collector and an active material layer. The current collector includes a first substrate and a second su...
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IPC IPC(8): H01M4/13H01M4/66H01M10/0525
CPCH01M4/13H01M10/0525H01M4/667H01M4/661H01M4/663H01M4/668H01M2004/021H01M2004/027H01M50/54
Inventor 汤强强
Owner NINGDE AMPEREX TECH
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