New solid electrolyte architecture for lithium metal based battery

我们的三年项目旨在开发新的全固态电池，用于电动汽车（EV）和 ** 便携式技术，具有高能量密度和长期稳定性，使用锂金属作为负极 **。金属锂是理想的阳极材料，因为它具有最高的理论容量（3860 mA/g）** 和最低的电化学电势（-3.04 V vs NHE）。然而，由于其高化学反应性，它尚未广泛用于商业应用。在使用标准液体电解质的电池循环期间，** 液体电解质可能降解，从而限制电池的寿命。此外，固体电解质界面的一些不均匀性 ** 会导致在锂金属沉积期间不受控制的枝晶形成。这种副反应可能是电池发生危险短路的原因。基于陶瓷作为锂离子导体物理屏障的固体电解质可以解决这一挑战。首先，我们将探索新的固态合成的超离子陶瓷固体电解质，通过使用热压方法，能够加热（高达1500° C）和压制（高达25吨/平方厘米）的前体，同时获得高密度的固体电解质 ** 丸。与此同时，我们将研究新的化学（例如溶液逐滴沉积）和物理 ** 方法（例如金属溅射），这些方法可以保护锂金属免受与我们的新 ** 材料可能发生的副反应。然后，我们将通过在热压机中混合不同的阴极材料（首先 ** 标准LiFePO 4和高能LiNiMnCoO 2）和新的超离子陶瓷固体电解质来制备新的高密度复合材料。这些新的三明治状复合材料将在全电池中进行测试，使用受保护的锂金属作为负极。电池将优化为在室温下运行。最后，我们将研究一种新型的陶瓷聚合物，它将使电池具有柔性。

Our three year project aims to develop new all-solid-state batteries to be used in electrical vehicles (EVs) and**portable technologies with high energy density and long term stability, by using lithium metal as negative**electrode. Metallic lithium is an ideal anode material since it has the highest theoretical capacity (3860 mA/g)**and the lowest electrochemical potential (-3.04 V vs NHE). However, it is not yet widely used in commercial**applications due to its high chemical reactivity. During battery cycling using standard liquid electrolyte the**liquid electrolyte may degrade, thereby limiting the lifetime of the battery. In addition, some inhomogeneities**of solid electrolyte interface can cause uncontrolled dendrite formation during the deposition of lithium metal.**This side reaction can be the cause of dangerous short-circuits for the battery. A solid electrolyte based on a**ceramic as lithium ionic conductor physical barrier may address this challenge. First we will explore new solid**state synthesis of superionic ceramic solid electrolytes by using a hot-press method that is able to heat (up to**1500° C) and press (up to 25 tons/cm2) the precursors, at the same time obtaining highly dense solid electrolyte**pellets. In parallel we will investigate new chemical (e.g. solution drop-by-drop deposition) and physical**methods (e.g. metal sputtering) that can protect lithium metal from possible side reactions with our new**materials. Then we will prepare new highly dense composites by mixing different cathode materials (at first**standard LiFePO4 and high energy LiNiMnCoO2) and new superionic ceramic solid electrolytes in a hot press**machine. These new sandwich like composites will be tested in a full cell using protected lithium metal as**negative electrode. The batteries will be optimized for operation at room temperature. Finally we will**investigate a new class of polymer-in-ceramic which will make the battery flexible.