Anode for secondary battery and jelly-roll type electrode assembly including anode
AssigneeLG Energy Solution, Ltd.
InventorsJung Geun Kwon, Ki Hoon Paeng
Life of this patent
Estimating the term…
Abstract
An anode for a secondary battery and a jelly-roll type electrode assembly including the anode. The anode includes an anode current collector that satisfies a creep rate condition represented by Formula 1 within a certain range. When the anode is applied to the jelly-roll type electrode assembly, deformation and/or expansion of electrode assembly can be controlled, even if it contains a silicon-containing anode active material because the stress generated from the exterior is significantly low. It is possible to ensure excellent safety because the stress accumulated in the anode current collector is greatly reduced, which lowers the risk of an internal disconnection of the electrode assembly.
Claims6
An anode for a secondary battery comprising:
- an anode current collector;
- and
- an anode layer mixture present on at least one surface of the anode current collector;
- wherein the anode mixture layer comprises an anode active material comprises a silicon material, artificial graphite, and carbon black,
- wherein the anode current collector satisfies a creep rate of Formula 1 below by falling in between 27 μm/sec to 40.1 μm/sec, wherein the creep rate is measured under a tensile force condition of 22±2° C. and 300 MPa:
- C60−C2/58 [Formula 1]
- wherein in Formula 1,
- C60 represents a change in length of the anode current collector 60 seconds after the tensile force has been applied, and
- C2 represents a change in length of the anode current collector 2 seconds after the tensile force has been applied,
- wherein the anode current collector has a tensile strength of 33.6 kg/mm2 to 34.2 kg/mm2,
- wherein the anode current collector comprises copper,
- wherein the anode current collector has an elongation rate of 11 to 15%, and
- wherein the silicon material is present from 1 to 40 parts by weight with respect to 100 parts by weight of the anode mixture layer.
Dependencies are inferred from the claim text.