Conductive carbon coated polymer for high temperature lithium ion battery shutdown deposited through 3D printing technique
AssigneesAirbus Singapore Private Limited, Singapore University of Technology and Design
InventorsZhixiang Huang, Glenn Joey Sim, Hui Ying Yang, Jeck Chuang Tan
Life of this patent
Estimating the term…
Abstract
A lithium (Li) ion battery includes a first electrode with a second electrode, and a shutdown polymer additive on an outer surface of the first electrode. The shutdown polymer additive includes at least two polyethylene layers, each polyethylene layer comprising a plurality of polyethylene microspheres. Each polyethylene microsphere is wrapped with carbon nanotubes. The polyethylene microspheres interconnect with each other such that the carbon nanotubes form a conductive network. The polyethylene layers are provided at predetermined areas of the outer surface of the first electrode.
Claims20
A lithium (Li) ion battery comprising:
- a first electrode with a second electrode;
- and
- a shutdown polymer additive on an outer surface of the first electrode,
- wherein the shutdown polymer additive comprises at least two additive dots, each of the additive dots comprising a plurality of polyethylene microspheres,
- wherein each of the polyethylene microspheres is wrapped with carbon nanotubes,
- wherein the polyethylene microspheres interconnect with each other such that the carbon nanotubes form a conductive network,
- wherein the additive dots are arranged at predetermined areas of the outer surface of the first electrode, and
- wherein the shutdown polymer additive provides:
- an operating mode, in which:
- a temperature of the battery is below a melting temperature of the polyethylene, and
- the conductive network allows Li ions to pass through the network to move between the first electrode and the second electrode, and
- a shutdown mode, in which:
- the temperature of the battery is at or above the melting temperature of the polyethylene, and
- the additive dots can melt to form essentially one insulating film, which prevents the Li ions from moving between the first electrode and the second electrode.
A method for producing a lithium (Li) ion battery, the method comprising:
- providing a first electrode and a second electrode;
- providing a shutdown polymer additive;
- loading the shutdown polymer additive into a syringe;
- moving the syringe with a programmable robotic arm;
- and
- depositing a predetermined amount of the shutdown polymer additive on at least two predetermined positions of an active outer surface of the first electrode of the Li ion battery,
- wherein the predetermined positions are selected such that, in a shutdown mode, the shutdown polymer additive forms essentially one insulating film for preventing Li ions from moving between the first electrode and the second electrode.
Dependencies are inferred from the claim text.