Is DN -based electrolytte the best lithium electrolyte?

　　Understanding the excellent performance of lithium electrodes in DN-based electrolytes (LiasF6-DN/TBA) is very important for improving the performance of commercial lithium batteries. This is because it is the optimal electrolyte system of metal lithium batteries reported in the literature so far, which may be applied in commercial lithium batteries. In DN -based electrolytes, the cycle efficiency of lithium is very high, and the deposition form of lithium is also very smooth. This is mainly due to the lithium in the DN base electrolyte. DN restore products), LIF and LIXASFY (lithium salt restore products) and DN low polymers (DN restore products). DN's low polymers are insoluble in electrolyte, and because they contain 0Li+edge group (Edge Groups), they are bonded on the surface of the lithium electrode. Because the lithium electrode SEI film contains this elastic component in this solvent, it makes The EI film of the lithium electrode is very flexible. Therefore, when the lithium is deposited or dissolved in this electrolyte system, it can better adapt to the volume change of metal lithium, so it can provide better passivation for the deposition of lithium.

　　The impact of the charging and discharge current density on the electrodes of the lithium electrode and the capacity attenuation mechanism The surface of the lithium electrode is always covered with a raw film composed of LI20-LIOH. When it is immersed in the DW basal electrolyte, they still have a certain stability Essence When it discharge at a lower rate, this layer of raw membrane does not change quickly, but maintains partial stability. Subsequently, because the only part of the lithium surface reaches the component of the electrolyte, the other part still maintains the original surfaceized compound, causing the surface of the lithium electrode to become very uneven. Therefore, in the above circumstances, the surface of the lithium electrode is uneven and mosaic -shaped, which leads to the unevenness of the lithium deposition process, which also generates the speed of branch crystals and the speed of lithium corrosion. In this way, the performance of the entire battery is from the performance of the entire battery. From the perspective of cycle life, it becomes poor. When these lithium battery system discharges at a high rate, lithium covering under the original ingredients will be exhausted quickly, so these surfaces will become very unstable, and the SEI membrane in the SEI film consisting of solvents restore products will be quickly reduced. Instead, the deposition process of lithium may be very uniform, and the deposition form of lithium is relatively smooth. Although in the DN -based electrolyte, the passivation of the lithium electrode surface is very effective, but it is almost impossible to obtain a SEI membrane with a complete dense and uniform, a little defect. Therefore, in the process of charging and discharge, there are some small -scale reactions between the lithium electrode and the electrolyte. The continuous reaction of the electrolyte and the lithium in the circulation process consumption of the limited lithium and electrolyte in the battery is to limit the battery cycle life to the battery cycle life. The important reason is that it eventually leads to the damage of the battery.

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