TY - JOUR
T1 - Molecular Sieve Induced Solution Growth of Li2O2 in the Li-O2 Battery with Largely Enhanced Discharge Capacity
AU - Yu, Wei
AU - Wang, Huwei
AU - Hu, Jing
AU - Yang, Wei
AU - Qin, Lei
AU - Liu, Ruliang
AU - Li, Baohua
AU - Zhai, Dengyun
AU - Kang, Feiyu
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 51232005 and No. 51772167), the National Key Basic Research Program of China (No. 2014CB932400), and the Shenzhen Basic Research Project (No. JCYJ20170412171311288).
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/3/7
Y1 - 2018/3/7
N2 - The formation of the insulated film-like discharge products (Li2O2) on the surface of the carbon cathode gradually hinders the oxygen reduction reaction (ORR) process, which usually leads to the premature death of the Li-O2 battery. In this work, by introducing the molecular sieve powder into the ether electrolyte, the Li-O2 battery exhibits a largely improved discharge capacity (63 times) compared with the one in the absence of this inorganic oxide additive. Meanwhile, XRD and SEM results qualitatively demonstrate the generation of the toroid Li2O2 as the dominated discharge products, and the chemical titration quantifies a higher yield of the Li2O2 with the presence of the molecular sieve additive. The addition of the molecular sieve controls the amount of the free water in the electrolyte, which distinguishes the effect of the molecular sieve and the free water on the discharge process. Hence, a possible mechanism has been proposed that the adsorption of the molecular sieves toward the soluble lithium superoxides improves the disproportionation of the lithium superoxides and consequently enhances the solution-growth of the lithium peroxides in the low donor number ether electrolyte. In general, the application of the molecular sieve triggers further studies concerning the improvement of the discharge performance in the Li-O2 battery by adding the inorganic additives.
AB - The formation of the insulated film-like discharge products (Li2O2) on the surface of the carbon cathode gradually hinders the oxygen reduction reaction (ORR) process, which usually leads to the premature death of the Li-O2 battery. In this work, by introducing the molecular sieve powder into the ether electrolyte, the Li-O2 battery exhibits a largely improved discharge capacity (63 times) compared with the one in the absence of this inorganic oxide additive. Meanwhile, XRD and SEM results qualitatively demonstrate the generation of the toroid Li2O2 as the dominated discharge products, and the chemical titration quantifies a higher yield of the Li2O2 with the presence of the molecular sieve additive. The addition of the molecular sieve controls the amount of the free water in the electrolyte, which distinguishes the effect of the molecular sieve and the free water on the discharge process. Hence, a possible mechanism has been proposed that the adsorption of the molecular sieves toward the soluble lithium superoxides improves the disproportionation of the lithium superoxides and consequently enhances the solution-growth of the lithium peroxides in the low donor number ether electrolyte. In general, the application of the molecular sieve triggers further studies concerning the improvement of the discharge performance in the Li-O2 battery by adding the inorganic additives.
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U2 - 10.1021/acsami.7b18472
DO - 10.1021/acsami.7b18472
M3 - Article
C2 - 29461029
AN - SCOPUS:85043345891
VL - 10
SP - 7989
EP - 7995
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 9
ER -