| abstract |
The invention provides a lithium ion battery with both safety and rate discharge performance. The invention improves the safety performance and rate discharge performance of the battery cell by using a pole piece with a double-layer coating layer, while avoiding high energy density. loss. The first coating layer in the pole piece of the double-layer coating layer contains more binders, which improves the adhesion between the positive electrode current collector and the positive electrode active material coating, thereby effectively improving the lithium ion battery needle. Thorn safety features. The conventional structure battery cannot pass the needle punch test, and the battery using the double-coated pole piece can pass the needle punch test. In addition, because the activated carbon material in the first coating layer can form a lithium ion capacitor with the lithium intercalation negative electrode, the rate discharge performance of the battery is also improved. |