Authors: Yuxuan Zuo, Jiahui Liu, Hangchao Wang, Ying Zou, Tie Luo, Kun Zhang, Yali Yang, Chuan Gao, Biao Li, Qiang Sun, Dingguo Xia
Published: 2024-11-28
Source: Full article
AbstractEfficient utilization of resources is crucial for the sustainable development of the lithium‐ion battery industry. Although the traditional Rm space group LiCoO2 can provide a current advanced discharge capacity of 215–220 mAh g⁻¹ at an upper cut‐off voltage of 4.6 V (relative to Li⁺/Li), it still falls far short of its theoretical specific capacity of 273 mAh g⁻¹, and exhibits structural instability and labile oxygen loss, leading to rapid capacity degradation. T#2‐Li0.69CoO2 is synthesized with Cmca space group and Li─O tetrahedral coordination. Owing to the unique Li─O tetrahedral coordination structure and the dominant cobalt oxidation under high voltage, T#2‐Li0.69CoO2 delivers an ultra‐high specific capacity of 258 mAh g−1, close to the theoretical capacity, in liquid electrolyte batteries and 253 mAh g−1 in solid state batteries, overcoming the structural instability of layered oxide cathodes during charging and discharging processes. This study broadens the possibilities of creating high energy‐density cathodes for next‐generation Li‐ion batteries.