Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 11, Pages 10663-10671Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b00116
Keywords
NaTi2(PO4)(3); hexadecylamine; interface; carbon layer; purity
Funding
- National Natural Science Foundation of China [51874110, 51604089]
- China Postdoctoral Science Foundation [2016M601431, 2018T110308]
- Heilongjiang Province Postdoctoral Science Foundation [LBH-Z16056, LBH-TZ1707]
- NSF [DMR-1620901]
- China Scholarship Council [201706120319]
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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 88.696 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.
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