Graphite Anode for a Potassium-Ion Battery with Unprecedented Performance.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Graphite anodes offer low cost and high energy density for potassium-ion batteries (PIBs).
• Current PIBs face challenges with limited cycle life and poor anode stability.
• Developing stable and long-lasting PIBs is crucial for next-generation energy storage.

Purpose of the Study:

• To enhance the stability and cycle life of graphite anodes in potassium-ion batteries.
• To investigate the role of passivation layers in improving PIB performance.
• To achieve high-performance PIBs comparable to lithium-ion batteries.

Main Methods:

• Utilized a concentrated electrolyte to form an inorganic-rich passivation layer on graphite anodes.
• Tested the electrochemical performance of the modified graphite anode in PIBs.
• Evaluated cycle stability, capacity retention, and area capacity under high mass loading.

Main Results:

• Demonstrated the formation of a robust inorganic-rich passivation layer on the graphite anode.
• Achieved over 2000 cycles with negligible capacity decay (over 17 months of operation).
• Obtained a high area capacity of 7.36 mAh/cm² at a high mass loading of 28.56 mg/cm².

Conclusions:

• The robust inorganic-rich passivation layer effectively resolves stability and cycle life issues in graphite anodes for PIBs.
• The enhanced graphite anode exhibits unprecedented performance, rivaling traditional lithium-ion batteries.
• This advancement paves the way for the rapid development of high-performance potassium-ion batteries.