Lithium ion battery

摘要

In a lithium ion battery, one or more chelating agents may be attached to a microporous polymer separator for placement between a negative electrode and a positive electrode or to a polymer binder material used to construct the negative electrode, the positive electrode, or both. The chelating agents may comprise, for example, at least one of a crown ether, a crown ether, a podand, a lariat ether, a calixarene, a calixcrown, or mixtures thereof. The chelating agents can help improve the useful life of the lithium ion battery by complexing with unwanted metal cations that may become present in the battery's electrolyte solution while, at the same time, not significantly interfering with the movement of lithium ions between the negative and positive electrodes.

主权项

1. A lithium ion battery, comprising:
a positive electrode; a negative electrode; a microporous polymer separator soaked in an electrolyte solution, the microporous polymer separator disposed between the positive electrode and the negative electrode; and a chelating agent chemically attached to the microporous polymer separator, a binder material of the negative electrode, or a binder material of the positive electrode, and wherein the one or more chelating agents complex with transition metal cations but complex less strongly with lithium ions so that the movement of lithium ions between the negative and positive electrodes is not substantially affected; wherein the chelating agent is selected from the group consisting of a crown ether, a cryptand, a podand, a lariat ether, a calixarene, a calixcrown, or a mixture of two or more of these chelating agents.