Two Steps Li Ion Storage Mechanism in Ruddlesden–Popper Li2La2Ti3O10

• DOI: 10.1002/advs.202410543
• Publication Date: 2025-01-22T09:52:12Z
• Authors: Mi Jang; Sunhyun Hwang; Ji Su Chae; Gun Jang; Ho Seok Park; Yunki Lee; JungHyun Choi; Won‐Sub Yoon; Kwang Chul Roh

Abstract Innovative anode materials are essential for achieving high‐energy‐density lithium‐ion batteries (LIBs) with longer lifetimes. Thus far, only a few studies have explored the use of layered perovskite structures as LIB materials. In this study, study demonstrates performance and charge/discharge mechanism previously undefined Ruddlesden‐Popper Li₂La₂Ti₃O₁₀ (RPLLTO) an material LIBs. RPLLTO exhibits two unique voltage plateaus ≈0.6 0.4 V(vs Li/Li + ), due to insertion lithium ions into different sites within its structure. The electrical state Ti is analyzed using X‐ray photoelectron spectroscopy absorption near edge spectra, revealing reduction from Ti⁴⁺ 2 ⁺, corresponding capacity 170 mAh·g⁻¹. situ diffraction patterns extended fine structure spectra demonstrate crystal changes during lithiation. Complementary expansion along a/b axes contraction c axis result in volume change 4%. This structural stability evidenced by 88% retention after 1000 cycles. successfully showcases storage capability contributes development diverse compositions structures.