Electrochemical Lithium Deposition on LiTi₅O₁₂

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium metal batteries (LMBs) offer high energy density but face challenges from lithium dendrite growth, impacting efficiency and safety.
• Uniform lithium deposition is crucial for improving LMB performance and overcoming commercialization hurdles.

Purpose of the Study:

• To design and evaluate a composite lithium anode (Li@Li₄Ti₅O₁₂) for enhanced lithium metal battery performance.
• To investigate the effect of a Li₄Ti₅O₁₂ skeleton on lithium deposition and battery cycling stability.

Main Methods:

• Fabrication of a composite anode with metallic lithium integrated onto a Li₄Ti₅O₁₂ skeleton.
• Symmetric cell testing to evaluate cycling stability and Coulombic efficiency under specific current densities.
• Full cell testing with LiFePO₄ cathode to assess long-term cycling performance and capacity retention.

Main Results:

• Li@Li₄Ti₅O₁₂ symmetric cells demonstrated stable cycling over 400 hours at 1 mA cm^-2, surpassing conventional lithium metal anodes (∼170 hours).
• Full cells utilizing the Li@Li₄Ti₅O₁₂ anode maintained 78.2% capacity retention after 550 cycles at a 3.6C rate.
• The Li₄Ti₅O₁₂ skeleton facilitated uniform lithium deposition, reducing dendrite formation.

Conclusions:

• The Li@Li₄Ti₅O₁₂ composite anode effectively suppresses lithium dendrite growth, leading to improved cycling stability and safety in LMBs.
• This approach offers a promising strategy for developing practical and high-performance lithium metal anodes for advanced energy storage applications.