Operando Analysis of Gas Evolution in TiNb2O7 (TNO)-Based Anodes for Advanced High-Energy Lithium-Ion Batteries under Fast Charging.
Dhrupad ParikhLinxiao GengHailong LyuCharl J JaftaHansan LiuHarry M MeyerJihua ChenXiao-Guang SunSheng DaiJianlin LiPublished in: ACS applied materials & interfaces (2021)
TiNb2O7 (TNO) is regarded as one of the promising next-generation anode materials for lithium-ion batteries (LIBs) due to its high rate capabilities, higher theoretical capacity, and higher lithiation voltage. This enables the cycling of TNO-based anodes under extreme fast charging (XFC) conditions with a minimal risk of lithium plating compared to that of graphite anodes. Here, the gas evolution in real time with TNO-based pouch cells is first reported via operando mass spectrometry. The main gases are identified to be CO2, C2H4, and O2. A solid-electrolyte interphase is detected on TNO, which continues evolving, forming, and dissolving with the lithiation and delithiation of TNO. The gas evolution can be significantly reduced when a protective coating is applied on the TNO particles, reducing the CO2 and C2H4 evolution by ∼2 and 5 times, respectively, at 0.1C in a half-cell configuration. The reduction on gas generation in full cells is even more pronounced. The surface coating also enables 20% improvement in capacity under XFC conditions.
Keyphrases
- ion batteries
- induced apoptosis
- room temperature
- mass spectrometry
- cell cycle arrest
- carbon dioxide
- high resolution
- oxidative stress
- cell death
- ionic liquid
- stem cells
- endoplasmic reticulum stress
- liquid chromatography
- cell proliferation
- gold nanoparticles
- bone marrow
- reduced graphene oxide
- capillary electrophoresis