DataVXThe Journal of Physical Chemistry CPaper
journal article·2019-05-23Open access

Evolution of Solid Electrolyte Interface on TiO2 Electrodes in an Aqueous Li-Ion Battery Studied Using Scanning Electrochemical Microscopy

Dongqing Liu, Qipeng Yu, Shuai Liu, Kun Qian, Shuwei Wang, Wei Sun, Xiao-Qing Yang, Feiyu Kang, Baohua Li

The Journal of Physical Chemistry C· Volume 123· Issue 20
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Source abstract

Abstract

Scanning electrochemical microscopy (SECM) was applied for in situ visualization of solid electrolyte interface (SEI) evolution on the TiO 2 anode in a concentrated aqueous electrolyte during cycling. In nonaqueous electrolytes, the SEI is an electronic insulative layer composed of organic and inorganic components covering the electrode surface. However, in concentrated aqueous electrolytes, the SEI is mostly composed of inorganic compounds formed by electrolyte decomposition, such as LiF and Li 2 CO 3, which are randomly distributed over the TiO 2 surface. In addition, the Ti 3+ and Li residuals accumulated through multiple cycling lead to an increase in the overall electronic conductivity of the TiO 2 anode. During the resting period after cycling, an inverse process is observed with partial dissolution of the formed SEI and the diffusion of Li residuals back into the electrolyte.
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Research context

Energy storage

OpenAlex topics: Advanced battery technologies research · Advancements in Battery Materials · Advanced Battery Technologies Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shenzhen Key Laboratory on Power Battery Safety Research and Shenzhen Geim Graphene Center, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China

Sunwoda Electronic Company Limited, Baoan District, Shenzhen 518055, China

Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua−Berkeley Shenzhen Institute, Shenzhen 518055, China

Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States

Funding

Office of Energy Efficiency and Renewable Energy · National Natural Science Foundation of China · Guangdong Province · Shenzhen Technical Plan Project

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