阳极
复合数
材料科学
阴极
容量损失
电解质
晶间腐蚀
储能
纳米技术
化学工程
复合材料
合金
化学
工程类
物理
电极
物理化学
功率(物理)
量子力学
作者
Se Young Kim,Hyungyeon Cha,Robert Kostecki,Guoying Chen
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2022-12-15
卷期号:8 (1): 521-528
被引量:26
标识
DOI:10.1021/acsenergylett.2c02414
摘要
All-solid-state batteries (ASSBs) consisting of a 4 V class layered oxide cathode active material (CAM), an inorganic solid-state electrolyte (SE), and a lithium metal anode are considered the future of energy storage technologies. To date, aside from the known dendrite issues at the anode, cathode instabilities due to oxidative degradation of the SE and reactivities between the SE and CAM as well as loss of mechanical integrity are considered to be the most significant barriers in ASSB development. In the present study, we address these challenges by developing composite cathode structures featuring two key design elements: (1) a halide SE with high oxidative stability to enable direct use of an uncoated 4 V class CAM and (2) a single-crystal (SC) CAM to eliminate intergranular cracking associated with volume changes and mechanical instability. We demonstrate exceptional performance achieved on such ASSB cells incorporating an uncoated SC-LiNi0.8Co0.1Mn0.1O2 (NMC811) CAM, a Li3YCl6 (LYC) SE, and a Li–In alloy anode, delivering a high discharge capacity of 170 mAh/g at C/5 and an impressive capacity retention of nearly 90% after 1000 cycles. Through comparative studies on polycrystalline and single-crystal NMC811 composite cathodes, we reveal the working mechanism that enables such stable cycling in the latter cell design. The study highlights the importance of proper cathode composite design and provides key insights in the future development of better-performing ASSB cells.
科研通智能强力驱动
Strongly Powered by AbleSci AI