Breakthrough in Energy Storage: Solid-State Polymer Lithium Metal Batteries

Researchers at Henan University in Zhengzhou, People's Republic of China, have made a significant discovery in the field of energy storage. The study, funded by the National Natural Science Foundation of China and the Beijing Institute of Technology Research Fund Program for Young Scholars, has led to the development of a novel inorganic-rich gradient solid electrolyte interphase (SEI) for solid-state polymer lithium metal batteries (SSPLMBs). This breakthrough could potentially revolutionize the energy storage industry by addressing the issues of Li dendritic growth and sluggish Li+ transport at the lithium anode interface.

Key Takeaways:

• The researchers proposed a high-valence cation-mediated strategy to construct an inorganic-rich gradient SEI using In(NO3)3 as an additive in a polyethylene oxide-based electrolyte (PEO-In(NO3)3).
• The inorganic-rich gradient SEI architecture exhibits superior Li+ diffusion kinetics and reduced energy barrier for lithium atom nucleation, leading to homogeneous lithium deposition morphology.
• The lifespan of the Li|PEO-In(NO3)3|LFP cell was improved by over one order of magnitude, with 78.3% capacity retention after 1000 cycles at 1 C, compared to the Li|PEO|LFP cell with common SEI.
• The study presents a novel avenue to the rational design of inorganic-rich gradient SEI, which is expected to enhance the stability and performance of SSPLMBs.
• The research has been peer-reviewed and published in the journal Energy Storage Materials in 2025.
• The study was conducted by a team of researchers led by Zidan Cao from Henan University, with additional authors Pengfei Zhai, Heng Mao, and Shuangquan Qu.

Statistics:

• Over one order of magnitude improvement in the lifespan of Li|PEO-In(NO3)3|LFP cell, from 100 to 1000 cycles.
• 78.3% capacity retention after 1000 cycles at 1 C for the Li|PEO-In(NO3)3|LFP cell.
• Li dendritic growth and sluggish Li+ transport at the lithium anode interface were addressed through the development of inorganic-rich gradient SEI.

Sources:

• NewsRx. Reports Summarize Energy Storage Findings from Henan University (High-valent Cation-mediated Inorganic-rich Gradient Sei for Highly Stable Solid State Polymer Lithium Metal Batteries). Energy Weekly News. October 31, 2025; p 353.
• Energy Storage Materials, 2025;81 (journal article).