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标题：Gas Evolution in Operating Lithium-Ion Batteries Studied In Situ by Neutron Imaging
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作者：Barbara Michalak ; Heino Sommer ; David Mannes 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep15627
语种：English
出版社：Springer Nature
摘要：Gas generation as a result of electrolyte decomposition is one of the major issues of high-performance rechargeable batteries. Here, we report the direct observation of gassing in operating lithium-ion batteries using neutron imaging. This technique can be used to obtain qualitative as well as quantitative information by applying a new analysis approach. Special emphasis is placed on high voltage LiNi_0.5Mn_1.5O₄/graphite pouch cells. Continuous gassing due to oxidation and reduction of electrolyte solvents is observed. To separate gas evolution reactions occurring on the anode from those associated with the cathode interface and to gain more insight into the gassing behavior of LiNi_0.5Mn_1.5O₄/graphite cells, neutron experiments were also conducted systematically on other cathode/anode combinations, including LiFePO₄/graphite, LiNi_0.5Mn_1.5O₄/Li₄Ti₅O₁₂ and LiFePO₄/Li₄Ti₅O₁₂. In addition, the data were supported by gas pressure measurements. The results suggest that metal dissolution in the electrolyte and decomposition products resulting from the high potentials adversely affect the gas generation, particularly in the first charge cycle (i.e., during graphite solid-electrolyte interface layer formation).