DOE OSTI · 3029102
Catalytic Electrolyte Additive for High-Loading and Lean Electrolyte Li–S Batteries
Abstract
The cycle life of high-energy Li–S cells is largely constrained by the quick electrolyte depletion. LiNO 3 has been a well-established additive known for protecting the Li metal anode and stabilizing the battery from polysulfide “shuttling”. However, it can be depleted prematurely and can pose safety risks when exposed to carbon, sulfur, or Li metal under harsh conditions. Here, in this study, LiPO 2 F 2 was explored as a safe and durable alternative additive in ether-based electrolytes. LiPO 2 F 2 demonstrates superior performance in Li/S batteries, especially under high sulfur loading (∼4 mg/cm 2 ) and lean electrolyte conditions (E/S = 4), achieving a long-term cycling stability of 40%, compared to 14.7% with LiNO 3 . This additive facilitates the disproportionation of polysulfides, reducing their dissolution and mitigating the shuttle effect. Additionally, LiPO 2 F 2 promotes the formation of a stable solid-electrolyte interphase (SEI) composed of inorganic anion-derived species, improving the battery’s overall stability and functionality. These findings blaze a trail in the design of safer and more durable electrolytes for Li–S batteries.
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Le, Kha Minh [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)], Phan, An L. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)] (ORCID:000000026822994X), Anderson, Cassidy S. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)], Feng, Shuo [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)], Tran, Nhan Thanh [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)] (ORCID:000000020121062X), Shi, Lili [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)], Duong, Minh Van [Univ. of Washington, Seattle, WA (United States)] (ORCID:0000000262757397), Parab, Saurabh [Univ. of California, San Diego, CA (United States)], Bhamwala, Bhargav [Univ. of California, San Diego, CA (United States)], Bao, Wurigumula [Univ. of Chicago, IL (United States)] (ORCID:0000000181091546), Meng, Ying Shirley [Univ. of California, San Diego, CA (United States); Univ. of Chicago, IL (United States)] (ORCID:0000000189368845), Xiao, Jie [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)] (ORCID:0000000255205439), Liu, Jun [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)], Lu, Dongping [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)] (ORCID:0000000195978500), Le, Phung M. L. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)] (ORCID:0000000310553672). 2025-06-12. Catalytic Electrolyte Additive for High-Loading and Lean Electrolyte Li–S Batteries. https://doi.org/10.1021/acsaem.5c01295
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