High rate capability design of lithium ion secondary battery
AssigneeIndustrial Technology Research Institute
InventorsHung-Chun Wu, Ching-Yi Su, Ping-Hsun Hsieh, Bing-Ming Lin, Mo-Hua Yang, Nae-Lih Wu
Life of this patent
Estimating the term…
Abstract
A lithium ion secondary battery includes LiFePO4 as a major component of the positive electrode active material. In order to implement the high rate capability with 10C/1C rate larger than 80%, the invention designs a positive electrode on a current collector with a ratio (A/t) of coating area to coating thickness greater than 1.2×106 (mm) and uses more than one tab on the current collector. The design of the invention can be applied to other active materials with low conductivity as the positive electrode for lithium ion battery.
Claims19
A lithium ion secondary battery comprising a positive electrode;
- a negative electrode;
- a separating film that separates the positive electrode and the negative electrode;
- and an electrolyte forming a lithium ion channel between the positive electrode and the negative electrode, wherein the positive electrode comprises a current collector substrate;
- one single tab or a plurality of tabs connected to the current collector substrate;
- and an electrode layer of a positive electrode material on one surface of the current collector, wherein the positive electrode material comprises LiFePO4 as a major component thereof, and the electrode layer of the positive electrode material has a ratio of its area to its thickness greater than 1.2×106 mm, and wherein the lithium ion secondary battery has a ratio of its capacity at discharge rate of 10C to its capacity at discharge rate of 1C is greater than 80%.
A lithium ion secondary battery comprising a positive electrode;
- a negative electrode;
- a separating film that separates the positive electrode and the negative electrode;
- and an electrolyte forming a lithium ion channel between the positive electrode and the negative electrode, wherein the positive electrode comprises a current collector substrate;
- one single tab or a plurality of tabs connected to the current collector substrate;
- and an electrode layer of a positive electrode material on one surface of the substrate, wherein the positive electrode material comprises a lithium compound as a major component thereof, the lithium compound has a conductivity of a level between 10−5 to 10−10 S/cm, and the electrode layer of the positive electrode material has a ratio of its area to its thickness greater than 1.2 ×106 mm, and wherein the lithium ion secondary battery has a ratio of its capacity at discharge rate of 10C to its capacity at discharge rate of 1C greater than 80%.
Dependencies are inferred from the claim text.