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A P2@Tunnel Heterostructure Cathode for High‐Performance Sodium‐Ion Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-10-08 , DOI: 10.1002/celc.202001054 Qun Huang 1 , Yiming Feng 1 , Sheng Xu 2 , Lei Xiao 1 , Pingge He 3 , Xiaobo Ji 1 , Peng Wang 2 , Liangjun Zhou 1 , Weifeng Wei 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-10-08 , DOI: 10.1002/celc.202001054 Qun Huang 1 , Yiming Feng 1 , Sheng Xu 2 , Lei Xiao 1 , Pingge He 3 , Xiaobo Ji 1 , Peng Wang 2 , Liangjun Zhou 1 , Weifeng Wei 1
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High‐working potential layered oxides as cathode materials have been considered as an effective way to improve the energy density of Na‐ion batteries (NIBs) to enhance their competitiveness as a promising alternative for lithium ion batteries in large‐scale energy storage applications. However, they generally suffer irreversible phase transition, large volume change and electrolyte corrosion when charged to high voltage (>4.2 V), resulting in poor cyclic stability. In this work, a P2@tunnel heterostructure cathode material is designed and obtained by wet chemistry combined with solid‐state reaction method. Moreover, partly of the Ti4+ ions which are designed for the tunnel structure is also doped into the P2 phase under high temperature annealing process, resulting in expanded crystal parameters and smooth charge‐discharge profiles. The stable tunnel structure layer can effectively protect the layered P2 type cathode material from corrosion by electrolyte upon high voltage and alleviate the crack propagated from the particle surface. Therefore, the P2@tunnel heterostructure cathode can still maintain a discharge capacity of 146.3 mAh g−1 while the discharge capacity of pristine P2 type cathode is only 114.4 mAh g−1 after 100 cycles at 0.25 C, it also reveals superior cyclic stability and rate performance compared to the pristine P2 type cathode.
中文翻译：
适用于高性能钠离子电池的P2 @ Tunnel异质结构阴极
高工作电位分层氧化物作为阴极材料已被认为是提高Na-离子电池（NIB）能量密度，增强其竞争力的有效方法，是锂离子电池在大规模储能应用中的有希望的替代品。但是，当充电至高电压（> 4.2 V）时，它们通常会发生不可逆的相变，大体积变化和电解质腐蚀，导致较差的循环稳定性。在这项工作中，设计并通过湿化学结合固态反应方法获得了P2 @ tunnel异质结构阴极材料。此外，部分Ti 4+在高温退火过程中，为隧道结构设计的离子也被掺杂到P2相中，从而扩大了晶体参数并实现了平滑的充放电曲线。稳定的隧道结构层可以有效地保护层状P2型正极材料免受高电压下电解质的腐蚀，并减轻了从颗粒表面传播的裂纹。因此，P2隧道异质结构阴极仍可保持146.3 mAh g -1的放电容量，而原始P2型阴极在0.25 C循环100次后的放电容量仅为114.4 mAh g -1，还显示出优异的循环稳定性和稳定性。与原始P2型阴极相比具有更高的性能。
更新日期：2020-11-03
中文翻译：
适用于高性能钠离子电池的P2 @ Tunnel异质结构阴极
高工作电位分层氧化物作为阴极材料已被认为是提高Na-离子电池（NIB）能量密度，增强其竞争力的有效方法，是锂离子电池在大规模储能应用中的有希望的替代品。但是，当充电至高电压（> 4.2 V）时，它们通常会发生不可逆的相变，大体积变化和电解质腐蚀，导致较差的循环稳定性。在这项工作中，设计并通过湿化学结合固态反应方法获得了P2 @ tunnel异质结构阴极材料。此外，部分Ti 4+在高温退火过程中，为隧道结构设计的离子也被掺杂到P2相中，从而扩大了晶体参数并实现了平滑的充放电曲线。稳定的隧道结构层可以有效地保护层状P2型正极材料免受高电压下电解质的腐蚀，并减轻了从颗粒表面传播的裂纹。因此，P2隧道异质结构阴极仍可保持146.3 mAh g -1的放电容量，而原始P2型阴极在0.25 C循环100次后的放电容量仅为114.4 mAh g -1，还显示出优异的循环稳定性和稳定性。与原始P2型阴极相比具有更高的性能。
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