LITHIUM ION SECONDARY BATTERY

摘要

A lithium ion secondary battery includes a binder that binds an active material to a current collector in the positive electrode or negative electrodes or both. The binder contains a base material including a resin having a benzene ring, and a polyacene additive selected from the group consisting of naphthalene, anthracene, tetracene, and derivatives thereof. The active material is a carbonaceous material or a lithium-containing composite oxide having a crystal structure in which a distance between nearest oxygen atoms is 0.19 to 0.29 nm. Adhesion of the binder to the active material during the manufacturing of the lithium ion secondary battery is led to a closest-packed crystal plane in the crystal structure of the active material, so that inhibition of moving of lithium ions in and out of the active material due to the binder may be reduced.

主权项

1. A lithium ion secondary battery comprising a binder that binds an active material to a current collector in at least one of the positive electrode and the negative electrode, wherein
the binder comprises a base material made of a resin having a benzene ring, and a polyacene additive which is anthracene, or a derivative of thereof, and the active material is a carbonaceous material or a lithium-containing composite oxide having a crystal structure in which a distance between nearest oxygen atoms is 0.19 to 0.29 nm.