I am working on mixed transition metal oxides as anode materials for Li-ion batteries. I see people reporting on many papers that the oxygen and moisture content of the glove box should be less than 1 ppm when assembling the electrochemical cells. But, in our case the glove box we have cannot keep the moisture and oxygen level as low as 1ppm. And I am using argon gas to fill and flush out the air and moisture from the glove box. So, will there be any significant effect on the cyclic capacity of the electrode material due to the relatively high moisture and oxygen content in the glove box?
Thank you everyone in advance for your suggestions.
In common carbonate-based electrolytes containing LiPF6, traces of water will lead to the formation of HF which causes severe degradation. Therefore you should keep the moisture inside the glovebox as low as possible!
To add to the explanation above, presence of ppm levels of H2O in the electrolyte leads to HF formation. HF reacts with Mn (3+) in the cathode and causes its disproportionation into Mn(2+) and Mn (4+). Mn(2+) is soluble in the electrolyte and is hence leached from the cathode & deposited on the anode causing unstable SEI. This leads to eventual cell failure due to Li plating on SEI.
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