Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 6, Pages 5560-5568Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b17659
Keywords
sodium alginate; binder; anatase TiO2; durable; sodium ion batteries
Funding
- National Basic Research Program of China [2015CB251100]
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Sodium alginate (SA) is investigated as the aqueous binder to fabricate high-performance, low-cost, environmentally friendly, and durable TiO2 anodes in sodium-ion batteries (SIBs) for the first time. Compared to the conventional polyvinylidene difluoride (PVDF) binder, electrodes using SA as the binder exhibit significant promotion of electrochemical performances. The initial Coulombic efficiency is as high as 62% at 0.1 degrees C. A remarkable capacity of 180 mAh is achieved with no decay after 500 cycles at 1 degrees C. Even at 10 degrees C (3.4 A g(-1)), it remains 82 mAh g(-1) after 3600 cycles with approximate 100% Coulombic efficiency. TiO2 electrodes with SA binder display less electrolyte decomposition, fewer side reactions, high electrochemistry reaction activity, effective suppression of polarization, and good electrode morphology, which is ascribed to the rich carboxylic groups, high Young's modulus, and good electrochemical stability of SA binder.
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