Anode Properties of NaTi2(PO4)3 Prepared by Adding Excess Na2CO3 for Aqueous Sodium-Ion Batteries
Anode Properties of NaTi2(PO4)3 Prepared by Adding Excess Na2CO3 for Aqueous Sodium-Ion Batteries
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DOI：
10.1021/acsaem.2c01212
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发表时间：
2022-08
影响因子：
6.4
通讯作者：
A. Kitajou;M. Yamashita;W. Kobayashi;M. Okada;Takuma Nanami;S. Muto
中科院分区：
文献类型：
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作者：
A. Kitajou;M. Yamashita;W. Kobayashi;M. Okada;Takuma Nanami;S. Muto
水钠离子电池（ASIBs）正在开发作为下一代大型可充电电池类型之一。在ASIBs的发展中，进一步改善其中之一NaTi 2（PO 4）3（NTP）的阳极性能是重要的。因此，我们尝试用具有Na离子传导性的材料如固体电解质界面层来改性NTP表面。NTP的制备与添加过量的Na 2CO 3，并表现出更好的循环能力和速率能力。特别地，即使使用具有低盐浓度的水性电解质，该NTP也显示出良好的循环稳定性。使用S/TEM和电子能量损失谱测量分析所获得的NTP的表面。颗粒表面通过富Na相如Na 3 Ti 23+（PO 4）3改性。此外，制备的NTPs具有高结晶度，这被认为有助于良好的倍率性能。我们发现了一种简单的方法，在NTP合成过程中添加过量的Na 2CO 3，以改善NTPs的阳极性能。
Aqueous Na-ion batteries (ASIBs) are being developed as one of the next-generation large-scale rechargeable battery types. In the development of ASIBs, the further improvement of the anode properties of one of them, NaTi2(PO4)3(NTP), is important. Therefore, we tried to modify the NTP surface with a material having Na-ion conductivity, such as a solid electrolyte interphase layer. NTP was prepared with the addition of an excess amount of Na2CO3and exhibited better cyclability and rate capability. In particular, this NTP showed good cycle stability even with the use of an aqueous electrolyte with a low salt concentration. The surfaces of the obtained NTPs were analyzed using S/TEM and electron energy loss spectroscopy measurements. The particle surface was modified by a Na-rich phase such as Na3Ti23+(PO4)3. In addition, the prepared NTPs had high crystallinity, which is thought to contribute to the good rate capability. We have found a simple method of adding excess Na2CO3during NTP synthesis to improve the anode properties of NTPs.