Enhancing stable and high-rate lithium ion storage through multifunctional molecular release in a phosphorus/carbon-bipyridine hybrid anode
Source abstract
Abstract
Phosphorus has emerged as a promising anode material due to its high specific capacity of 2594 mA h g-1 and medium redox potential of about 0.7 V (vs. Li+/Li). However, large volume changes and low ion reaction kinetics are still the dominant challenges that affect the long-term cycle stability and high-rate performance of phosphorus anodes. Herein, bipyridine is introduced to modify phosphorus/carbon composites. The highly doped bipyridine can be slowly released into the electrolyte during cycling, utilizing its Lewis base properties to effectively neutralize HF acid byproducts, thereby protecting the electrode integrity. Meanwhile, it can reduce the binding energy of lithium ions and solvent molecules, and promote the desolvation of lithium ions, thus improving the high-rate performance. As a result, P/C-bpy still provides a specific capacity of 1043.44 mA h g-1 after 800 cycles at a current density of 1 A g-1, corresponding to a capacity retention of 97.30%. And even at a high-rate of 15 A g-1, it still provides a high specific capacity of 599.09 mA h g-1.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced Battery Technologies Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, P. R. China
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, P. R. China
Southern University of Science and Technology, Shenzhen, 518055, P. R. China
National Engineering Research Center for Colloidal Materials and School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China
Shenzhen University of Advanced Technology, Shenzhen, 518055, P. R. China
Funding
National Natural Science Foundation of China · National Key Research and Development Program of China · Basic and Applied Basic Research Foundation of Guangdong Province · Shenzhen Science and Technology Innovation Program
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