Lithium ion battery

Abstract

A lithium ion battery includes a positive electrode sheet and an electrolyte. The positive electrode sheet includes a positive electrode current collector and an active substance layer arranged on the positive electrode current collector. The density of the electrolyte, the concentration of a lithium salt in the electrolyte and the surface density of the active substance layer arranged on the positive electrode current collector meet a specific relational expression. While the performance of the lithium ion battery is ensured, the concentration of the lithium salt in the electrolyte is reduced, thus effectively reducing the cost of battery cells. A reduction in the lithium salt concentration results in a decrease in the electrolyte viscosity, which improves the wettability of the electrolyte, thereby allowing a small quantity of the injected electrolyte meeting the relational expression in the same electrolyte injection volume in a battery cell dimension, which reduces battery cost.

Dependencies are inferred from the claim text.