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Researchers developed a scalable ultrafast-charging anode (C@MEG) for lithium-ion batteries. This advanced graphite anode significantly improves charging speed and battery lifespan, addressing key limitations in electric vehicle technology.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Electric vehicle (EV) growth demands faster lithium-ion battery charging.
  • Current graphite anodes struggle with fast charging due to slow kinetics and unstable interfaces, leading to capacity loss and reduced lifespan.

Purpose of the Study:

  • To develop a scalable, ultrafast-charging anode material for lithium-ion batteries.
  • To overcome the limitations of conventional graphite anodes in high-rate charging applications.

Main Methods:

  • Kilogram-level scalable production of a novel anode material (C@MEG) composed of micro-expanded graphite coated with an ultrathin disordered carbon layer.
  • Characterization of electrochemical performance, including capacity, cyclability, and power density.

Main Results:

  • The C@MEG anode demonstrated rapid surface-to-bulk lithium transport, reduced polarization, and enhanced pseudocapacitive behavior.
  • At 10 C, Li||C@MEG cells achieved 157 mAh g-1 capacity, outperforming pristine graphite.
  • A 1 Ah-level pouch battery showed 92% capacity retention after 1000 cycles at 3 A and high power density (1500 W kg-1 at 10 A), enabling a 4.2-minute charge time.

Conclusions:

  • The C@MEG anode offers a practical and scalable solution for fast-charging lithium-ion batteries.
  • This technology enables high-energy, high-power, and long-life battery applications, crucial for the advancement of electric vehicles.