High-performance K-ion half/full batteries with superb rate capability and cycle stability

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Potassium-ion (K-ion) batteries are a promising alternative to lithium-ion batteries due to potassium's abundance and low cost.
• Developing K-ion batteries with high energy density, excellent rate capability, and long cycle life remains a significant challenge for practical applications.

Purpose of the Study:

• To explore advanced K-ion battery materials with enhanced electrochemical performance.
• To achieve high rate capability and superior cycle stability for practical K-ion battery applications.

Main Methods:

• Fabrication and electrochemical testing of K-ion half cells and full cells.
• Performance evaluation including specific capacity, rate capability, and cycle stability.

Main Results:

• The K-ion half cell achieved a specific capacity of 330 mA h g^-1 at 100 mA g^-1 with 120% capacity retention after 2,000 cycles at 2,000 mA g^-1.
• The full cell demonstrated 98% capacity retention over 750 cycles at 500 mA g^-1.
• Performance metrics surpass those reported for most carbon-based K-ion battery materials.

Conclusions:

• The developed K-ion battery materials offer excellent rate capability and cycle stability.
• This work signifies a step towards practical applications of advanced K-ion batteries.
• The findings highlight the potential of these materials for next-generation energy storage solutions.