Hello all,
My question pertains to the rationale behind selecting the lower and upper voltage limits for the electrochemical window in lithium-ion batteries, regardless of the active material (e.g., NMC, LMNO, etc.). Essentially, when testing a material that is not documented in the literature, is there a protocol that should be followed to determine the correct electrochemical window? Furthermore, what is the reasoning behind it? For instance (please note that this is a hypothetical example and not an assertion), the upper limit should not exceed X volts due to potential degradation of the active material or formation of the solid-electrolyte interphase (SEI).
For example, why not cycle NMC at 5V upper limit ?
In our case we are using NMC with additive materials and with LIPF6 has an electrolyte.
Thanks in advance
In case your material is rarely reported, you can conduct the cyclic voltammetry test. Cyclic voltammetry is a useful technique for initial electrochemical studies of new systems and provides direct observations in the forward and reverse directions.
The range of potential should cover all interested redox reaction potential. And it should be within the stability window of the electrolyte. Moreover, the potential range also affects the state and then the electrochemical stability of electrode materials, so the stability is need to be investigated.
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