Enabling Long‐Term Cycling Stability Within Layered Li‐Rich Cathode Materials by O2/O3‐Type Biphasic Design Strategy

• DOI: 10.1002/adfm.202205199
• Publication Date: 2022-07-20T20:11:43Z
• Authors: Xin Cao; Jianming Sun; Zhi Chang; Pengfei Wang; Xiyan Yue; Jun Okagaki; Ping He; Eunjoo Yoo; Haoshen Zhou
• Keywords: Structural Stability; Rietveld Refinement; Selected area diffraction

Abstract Typical Li‐rich layered oxides are widely regarded as promising cathode candidates for high‐energy‐density Li‐ion batteries because of additional output capacities boosted by oxygen redox activities. However, its commercialized applications hindered serious capacity loss and voltage decay related to structural degradation upon cycling. Herein, a Co/Ni‐free biphasic O2/O3‐type material is proposed, Li 0.9 [Li 0.3 Mn 0.7 ]O 2 , which has been successfully prepared the + /Na ion‐exchange strategy characterized XRD Rietveld refinement SAED well HRTEM analyses. with an approximate composition 81% O2 19% O3 phases confirmed. Furthermore, exhibits high discharge 232 mAh g −1 retention 88.1% after 500 cycles at current density 200 mA . That is, volume changes O3‐type phase effectively restricted during (de)intercalations, further enhancing stability suppressing formation spinel due design. Altogether, these findings prove design feasible achieve materials long‐term cycle stability.