Biomimetic composite architecture achieves ultrahigh rate capability and cycling life of sodium ion battery cathodes
Biomimetic composite architecture achieves ultrahigh rate capability and cycling life of sodium ion battery cathodes
复制标题
仿生复合结构实现钠离子电池阴极的倍率性能和循环寿命
DOI：
10.1063/5.0020805
复制
发表时间：
2020-12
影响因子：
15
通讯作者：
K. Shin;S. Park;Puritut Nakhanivej;Yixian Wang;Pengcheng Liu;Seong‐Min Bak;Min Sung Choi;D. Mitlin;H. Park
中科院分区：
文献类型：
--
作者：
K. Shin;S. Park;Puritut Nakhanivej;Yixian Wang;Pengcheng Liu;Seong‐Min Bak;Min Sung Choi;D. Mitlin;H. Park
由于钠的丰富和广泛分布，钠离子电池是在大规模电能存储系统中替代锂离子电池的新兴候选者。尽管人们的兴趣越来越大，但高性能钠阴极材料的开发仍然是一个挑战。特别是，与其他阴极材料相比，聚阴离子化合物因其更好的循环稳定性、更平坦的电压曲线和更强的热稳定性而被认为是强有力的阴极候选物。在这里，我们报告了仿生骨启发的聚阴离子Na 3V 2（PO 4）3-还原氧化石墨烯复合材料（BI-NVP）阴极的合理设计，该阴极在钠离子电池中实现了恒速充电和超长的循环寿命。在1 C的充电速率下，BI-NVP提供其理论容量的97%，即使在200 C的超高速率下也能够保持电压平台。在50 ℃下循环10000次后，容量保持率达91%.具有BI-NVP阴极和Na金属阳极的钠离子电池单元能够提供350 W h kg−1的最大比能量和154 kW kg−1的最大比功率。循环的BI-NVP的原位和事后分析（包括通过拉曼和XRD光谱）HRTEM和STEM-EELS表明高度可逆的膨胀-收缩、可忽略的电极粉碎和稳定的NVP还原的氧化石墨烯层界面。本文提出的结果为钠离子电池全电池在与钠金属阳极配对时的低功率和超长循环能力的电极结构提供了合理的和仿生的材料设计。
Sodium ion batteries are an emerging candidate to replace lithium ion batteries in large-scale electrical energy storage systems due to the abundance and widespread distribution of sodium. Despite the growing interest, the development of high-performance sodium cathode materials remains a challenge. In particular, polyanionic compounds are considered as a strong cathode candidate owing to their better cycling stability, a flatter voltage profile, and stronger thermal stability compared to other cathode materials. Here, we report the rational design of a biomimetic bone-inspired polyanionic Na3V2(PO4)3-reduced graphene oxide composite (BI-NVP) cathode that achieves ultrahigh rate charging and ultralong cycling life in a sodium ion battery. At a charging rate of 1 C, BI-NVP delivers 97% of its theoretical capacity and is able to retain a voltage plateau even at the ultra-high rate of 200 C. It also shows long cycling life with capacity retention of 91% after 10 000 cycles at 50 C. The sodium ion battery cells with a BI-NVP cathode and Na metal anode were able to deliver a maximum specific energy of 350 W h kg−1 and maximum specific power of 154 kW kg−1. In situ and postmortem analyses of cycled BI-NVP (including by Raman and XRD spectra) HRTEM, and STEM-EELS, indicate highly reversible dilation–contraction, negligible electrode pulverization, and a stable NVP-reduced graphene oxide layer interface. The results presented here provide a rational and biomimetic material design for the electrode architecture for ultrahigh power and ultralong cyclability of the sodium ion battery full cells when paired with a sodium metal anode.