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Layered perovskite LiEuTiO4 as a 0.8 V lithium intercalation electrode
Jun Huang1, Kaihua Yang, Zhengxi Zhang
1School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. liyangce@sjtu.edu.cn zhengxizhang@sjtu.edu.cn.
Chemical Communications (Cambridge, England)
|June 28, 2017
Summary
A new lithium intercalation material, LiEuTiO4, shows promise as a stable anode for lithium-ion batteries, offering high capacity and excellent cycle life near the 1V potential. This avoids lithium plating and maintains high energy density.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- 1V lithium intercalation materials are crucial for advanced lithium-ion batteries, balancing lithium plating tolerance and energy density.
- Existing materials like graphite pose plating risks, while Li4Ti5O12 reduces overall battery voltage and energy density.
Purpose of the Study:
- To synthesize and characterize a novel 1V lithium intercalation material, LiEuTiO4, for improved lithium-ion battery anodes.
- To evaluate the electrochemical performance, capacity, and cycle stability of LiEuTiO4.
Main Methods:
- Synthesis of NaEuTiO4 via a sol-gel method.
- Ion-exchange reaction to produce the layered perovskite LiEuTiO4.
- Electrochemical testing to determine intercalation/deintercalation potential, capacity, and cycle stability.
Main Results:
- LiEuTiO4 was successfully synthesized with a 0.8V lithium intercalation/deintercalation plateau.
- Achieved a high second discharge capacity of 219.2 mA h g⁻¹ at 100 mA g⁻¹.
- Demonstrated exceptional cycle stability, retaining ~217 mA h g⁻¹ after 500 cycles with 99.2% Coulombic efficiency.
- Lithium intercalation involves the reduction of Eu³⁺ to Eu²⁺, distinct from Ti-based anodes.
Conclusions:
- LiEuTiO4 exhibits superior cycle stability compared to previously reported ~1V electrodes.
- The unique Eu³⁺/Eu²⁺ redox couple offers a new mechanism for lithium intercalation in 1V anodes.
- LiEuTiO4 is a highly promising anode material for next-generation lithium-ion batteries.
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