Shi Wen-Jing, Zhang Ding, Meng Xiao-Meng, Bao Chen-Xun, Xu Shou-Dong, Chen Liang, Wang Xiao-Min, Liu Shi-Bin, Wu Yu-Cheng
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Collaborative Innovation Center of Green Energy Materials and Energy Storage Systems, Taiyuan University of Technology, Taiyuan 030024, China.
ACS Appl Mater Interfaces. 2020 Mar 25;12(12):14174-14184. doi: 10.1021/acsami.0c00788. Epub 2020 Mar 10.
Sodium-ion batteries (SIBs) are recognized as attractive alternatives for grid-scale electrochemical energy storage applications. Transition metal oxide cathodes represent one of the most dynamic materials for industrialization among the various cathodes for SIBs. Here, a cation-doped cathode NaMnTiO with a tunnel structure is introduced, which undergoes a lowered volume change of only 5.26% during the Na insertion/extraction process. Moreover, the average Na diffusion coefficients are enhanced by more than 3-fold upon the doping of the Ti cation. The obtained cathode delivers a practically usable capacity of 119 mAh g at 0.1 C as well as an enhanced discharge capacity of 96 mAh g at 5 C. Durability is demonstrated by the retained 71 mAh g after 1000 cycles, corresponding to a capacity retention of 74%. This work demonstrates that the reticular NaMnTiO is a promising ultrastable cathode material for the development of long-life sodium-ion batteries.
钠离子电池（SIBs）被认为是用于电网规模电化学储能应用的有吸引力的替代方案。过渡金属氧化物阴极是钠离子电池各种阴极中最具工业化潜力的材料之一。在此，引入了一种具有隧道结构的阳离子掺杂阴极NaMnTiO，其在钠嵌入/脱出过程中体积变化仅为5.26%，有所降低。此外，在掺杂钛阳离子后，平均钠扩散系数提高了3倍以上。所制备的阴极在0.1 C时具有119 mAh g的实际可用容量，在5 C时放电容量增强至96 mAh g。1000次循环后保留71 mAh g，容量保持率为74%，证明了其耐久性。这项工作表明，网状NaMnTiO是用于开发长寿命钠离子电池的一种有前景的超稳定阴极材料。
