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Solvation Structure Modulation of High-Voltage Electrolyte for High-Performance K-Based Dual-Graphite Battery.

Chengjun Han1, Haiyan Wang1, Zelin Wang1

  • 1Advanced Energy Storage Technology Research Center, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

Researchers developed a new electrolyte strategy to improve potassium-based dual-carbon batteries (K-DCBs). This approach enhances ion storage and intercalation, leading to better capacity and cycle life for high-performance energy storage.

Keywords:
K-based dual-carbon batteriesanion intercalationhigh-voltage electrolytespotassium storagesolvation structure modulation

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Area of Science:

  • Energy Storage
  • Materials Science
  • Electrochemistry

Background:

  • Potassium-based dual-carbon batteries (K-DCBs) offer promising energy storage due to abundant resources.
  • Conventional electrolytes in K-DCBs suffer from poor oxidation resistance and limited anion intercalation at high voltages, hindering performance.
  • Novel electrolyte systems are crucial for advancing K-DCB technology.

Purpose of the Study:

  • To address the limitations of conventional electrolytes in K-DCBs.
  • To develop an effective strategy for improving both potassium ion (K+) storage and anion (bis(fluorosulfonyl)imide, FSI-) intercalation.
  • To demonstrate a high-performance K-DCB through electrolyte optimization.

Main Methods:

  • A solvation structure modulation strategy was employed for the K-DCB electrolyte.
  • The strategy focused on optimizing the interaction between electrolyte components and electrode materials.
  • Performance was evaluated through electrochemical testing of a proof-of-concept K-DCB.

Main Results:

  • The solvation modulation strategy significantly improved K+ ion storage at the graphite anode.
  • Enhanced bis(fluorosulfonyl)imide anion (FSI-) intercalation capacity was achieved at the graphite cathode.
  • The assembled K-DCB demonstrated a discharge capacity of 103.4 mAh g-1 with approximately 90% capacity retention after 400 cycles.
  • The full cell achieved an energy density of 157.6 Wh kg-1, setting a new benchmark for K-DCBs.

Conclusions:

  • Solvation structure modulation is an effective strategy for enhancing K-DCB performance.
  • The developed electrolyte system overcomes limitations of conventional electrolytes, enabling superior ion and anion intercalation.
  • This work paves the way for high-performance and stable potassium-based energy storage devices.