Purifying the Phase of NaTi2 (PO4 )3 for Enhanced Na+ Storage Properties

ACS Applied Materials & Interfaces
Lei WangReza Shahbazian-Yassar

Abstract

Sodium-ion batteries (SIBs) are increasingly on demand owning to their prospect as an inexpensive alternative to Li-ion batteries. However, designing electrode materials with satisfactory rate capacity performance requires high electron transport and Na+ conductivity, which is extremely challenging. Herein, we report a hexadecylamine (HDA)-mediated synthesis of NaTi2(PO4)3 (NTP) electrodes via one-step solvothermal process. The addition of HDA material (1) enables the formation of a carbon coating that improves the electron conductivity and (2) importantly serves as a structure-directing agent reducing the NTP-impurity phases in which the transport of Na+ ions are sluggish. As a result, the synthesized NTP anode delivers superior rate of capacity retention of 77.8% under the 100-fold increase in current densities. Moreover, outstanding specific capacity of 117.9 mAh g-1 at 0.5 C and capacity retention of 88.6% after 1500 cycles at 1 C can be obtained. The findings of this work provide new opportunity to design SIBs electrodes with superior electrical and ionic conductivity.

References

Aug 3, 2010·Chemical Communications : Chem Comm·Yingke ZhouZongping Shao
Aug 17, 2010·Nature Nanotechnology·David PechPatrice Simon
Dec 6, 2016·Chemical Communications : Chem Comm·Xiaowen Zhan, Mona Shirpour
Feb 18, 2017·ACS Applied Materials & Interfaces·Yunping WenYongyao Xia
Mar 30, 2017·Chemical Society Reviews·Jang-Yeon HwangYang-Kook Sun

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