After John wrote the abstract "首次将掺杂镍离子的Na1.6Co2O4材料用作超级电容器的电极材料,并进行了XRD、SEM的表征和恒流充放电、循环伏安的电性能研究,发现掺杂3％(摩尔分数)Ni2+的Na1.6Co2O4电极材料比纯的Na1.6Co2O4具有更优异的循环性能.", he wrote these keywords "掺杂, 电极材料, 超级电容器, 电化学性能". Do you think his choice of keywords was correct? Answer yes or no.
yes