Energy storage composite current collector

What is a composite current collector?

Recently, composite current collectors, prepared by plating metal layer (Al or Cu) on both sides of polymer (PET-Polyethylene terephthalate, PP-Polypropylene, PI-Polyimide) base, are waiting for commercialization due to its promising performance in increasing battery energy density , , , , , , .

How a composite current collector improve battery safety?

Self-breaking design of composite current collector helps improve battery safety. Self-breaking is fulfilled by introducing oxygen when evaporating aluminum layer. Extra oxygen forms multilayer structure containing Al oxide on the polymer core. Short circuit path is spontaneously cut-off by the multilayer structure.

Can composite current collector increase energy density and safety of lithium-ion batteries?

This study proposes a new design of composite current collector that simultaneously increase the energy density and safety of lithium-ion battery. The design includes a polyethylene-terephthalate base coated with multi-layer aluminum (what is called the PET-Al ML CC), rather than coated with single layer aluminum like the traditional method.

Can a phase change composite current collector be thermal-responsive?

If not dissipated efficiently, this heat can induce catastrophic thermal runaway. In this study, we present a built-in thermal-responsive design based on a phase change composite current collector, which is constructed by impregnating paraffin, a phase change material, into a nanoporous copper foil, followed by sealing through electroplating.

What is copper foil current collector?

Copper foil current collector plays an important role in collecting current and converting energy from chemical energy to electrical energy. Low intrinsic electrical resistance and interface resistance will facilitate electron transfer and reduce the internal resistance of the battery.

How can Composite copper foil improve the energy density of a battery?

Increasing energy density Composite copper foil with a sandwich structure can significantly reduce the weight of the current collector, thereby enlarging the energy density of the battery. In addition, the rough surface of composite copper foil can enhance the bonding strength between current collector and active material.