Affiliation:
1. Department Institute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Wenzhou Zhejiang 325035 China
2. Department National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs Engineering Research Center of MTEES (Ministry of Education) Key Laboratory of ETESPG (GHEI) School of Chemistry South China Normal University Guangzhou Guangdong 510006 China
3. Wenzhou Key Laboratory of Sodium-Ion Batteries Wenzhou University Technology Innovation Institute for Carbon Neutralization Wenzhou Zhejiang 325035 China
4. School of Materials and New Energy South China Normal University Shanwei Guangdong 516600 China
Abstract
AbstractHigh‐voltage lithium‐ion batteries (LIBs) have attracted great attention due to their promising high energy density. However, severe capacity degradation is witnessed, which originated from the incompatible and unstable electrolyte‐electrode interphase at high voltage. Herein, a robust additive‐induced sulfur‐rich interphase is constructed by introducing an additive with ultrahigh S‐content (34.04 %, methylene methyl disulfonate, MMDS) in 4.6 V LiNi0.5Co0.2Mn0.3O2 (NCM523)||graphite pouch cell. The MMDS does not directly participate the inner Li+ sheath, but the strong interactions between MMDS and PF6− anions promote the preferential decomposition of MMDS and broaden the oxidation stability, facilitating the formation of an ultrathin but robust sulfur‐rich interfacial layer. The electrolyte consumption, gas production, phase transformation and dissolution of transition metal ions were effectively inhibited. As expected, the 4.6 V NCM523||graphite pouch cell delivers a high capacity retention of 87.99 % even after 800 cycles. This work shares new insight into the sulfur‐rich additive‐induced electrolyte‐electrode interphase for stable high‐voltage LIBs.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Zhejiang Province
Subject
General Chemistry,Catalysis