Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 41, Pages 38285-38293Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b12020
Keywords
dimethyl sulfite; electrolyte additive; anode interphase; low resistance; low temperature; lithium-ion battery
Funding
- National Key R&D Program of China [2018YFB0104000]
- Key project of Science and Technology in Guangdong Province [2017A010106006]
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Performances of lithium-ion batteries at subambient temperatures are extremely restricted by the resistive interphases originated from electrolyte decomposition, especially on the anode surface. This work reports a novel strategy that an anode interphase of low impedance is constructed by applying an electrolyte additive dimethyl sulfite (DMS). Electrochemical measurements indicate that the as-constructed interphase provides graphite/LiNi0.5Co0.2Mn0.3O2 pouch cells with excellent low-temperature performance, outperforming the interphase constructed by 1,3,2-dioxathiolane 2,2-dioxide (DTD), a common commercially used electrolyte additive. Spectral characterizations in combination with theoretical calculations demonstrate that the improved performance is attributed to the unique molecular structure of DMS, which presents appropriate reduction activity and constructs the more stable and ionically conductive anode interphase due to the weaker combination of its reduction product with lithium ions than DTD. This rational design of interphases via an additive structure has been proven to be a low cost but rather an effective approach to tailor the performances of lithium-ion batteries.
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