Qiu Wenda, Xiao Hongbing, He Wenting, Li Juanhua, Luo An, Li Yu, Tong Yexiang
School of Eco-Environmental Technology, Guangdong Industry Polytechnic 152 Xingang West Road Guangzhou 510300 China
MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-Sen University 135 Xingang West Road Guangzhou 510275 China.
RSC Adv. 2018 Jul 27;8(47):26888-26896. doi: 10.1039/c8ra05128c. eCollection 2018 Jul 24.
A novel surface phosphate strategy was adopted to dramatically improve the charge transport, ion diffusion, electroactive sites, and cycle stability of mesoporous NiCoO nanowire arrays (NWAs), drastically boosting their electrochemical properties. Consequently, the as-prepared phosphated NiCoO NWA (P-NiCoO NWA) electrode achieved excellent energy storage performance as a bifunctional anode material for both lithium ion batteries (LIBs) and sodium ion batteries (SIBs). When evaluated as an anode for LIBs, this P-NiCoO NWA electrode showed a high reversible capacity up to 1156 mA h g for 1500 cycles at 200 mA g without appreciable capacity attenuation, while in SIBs, the electrode could also deliver an admirable initial capacity as high as 687 mA h g and maintained 83.5% of this after 500 cycles at the same current density. Most important, when the current density increased from 100 to 1000 mA g, the capacity retention was about 63% in LIBs and 54% in SIBs. This work may shed light on the engineering of efficient electrodes for multifunctional flexible energy storage device applications.
采用了一种新颖的表面磷酸盐策略，以显著改善介孔NiCoO纳米线阵列（NWAs）的电荷传输、离子扩散、电活性位点和循环稳定性，从而极大地提升其电化学性能。因此，所制备的磷酸化NiCoO NWA（P-NiCoO NWA）电极作为锂离子电池（LIBs）和钠离子电池（SIBs）的双功能负极材料，展现出优异的储能性能。当作为LIBs的负极进行评估时，该P-NiCoO NWA电极在200 mA g下循环1500次时，显示出高达1156 mA h g的高可逆容量，且无明显容量衰减；而在SIBs中，该电极在相同电流密度下循环500次后，也能提供高达687 mA h g的令人钦佩的初始容量，并保持其83.5%。最重要的是，当电流密度从100 mA g增加到1000 mA g时，在LIBs中的容量保持率约为63%，在SIBs中为54%。这项工作可能为多功能柔性储能器件应用的高效电极工程提供启示。
