材料科学
电化学
阳极
电解质
硫化物
阴极
化学工程
涂层
兴奋剂
氧化物
离子
锂(药物)
电极
复合材料
冶金
化学
物理化学
有机化学
光电子学
工程类
医学
内分泌学
作者
Jie Shi,Zhihui Ma,Di Wu,Yue Yu,Zhen Wang,Yixing Fang,Daxin Chen,Shuai Shang,Xuanhui Qu,Ping Li
出处
期刊:Small
[Wiley]
日期:2023-11-14
卷期号:20 (13)
被引量:3
标识
DOI:10.1002/smll.202307030
摘要
Abstract Structural damage of Ni‐rich layered oxide cathodes such as LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) and serious interfacial side reactions and physical contact failures with sulfide electrolytes (SEs) are the main obstacles restricting ≥4.6 V high‐voltage cyclability of all‐solid‐state lithium batteries (ASSLBs). To tackle this constraint, here, a modified NCM811 with Li 3 PO 4 coating and B/P co‐doping using inexpensive BPO 4 as raw materials via the one‐step in situ synthesis process is presented. Phosphates have good electrochemical stability and contain the same anion (O 2− ) and cation (P 5+ ) as in cathode and SEs, respectively, thus Li 3 PO 4 coating precludes interfacial anion exchange, lessening side reactivity. Based on the high bond energy of B─O and P─O, the lattice O and crystal texture of NCM811 can be stabilized by B 3+ /P 5+ co‐doping, thereby suppressing microcracks during high‐voltage cycling. Therefore, when tested in combination with Li─In anode and Li 6 PS 5 Cl solid electrolytes (LPSCl), the modified NCM811 exhibits extraordinary performance, with 200.36 mAh g −1 initial discharge capacity (4.6 V), cycling 2300 cycles with decay rate as low as 0.01% per cycle (1C), and 208.26 mAh g −1 initial discharge capacity (4.8 V), cycling 1986 cycles with 0.02% per cycle decay rate. Simultaneously, it also has remarkable electrochemical abilities at both −20 °C and 60 °C.
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