Commercial 18650 lithium ion cells containing a blended positive electrode of layered LiNi_0.5Mn_0.3Co_0.2O₂ and spinel Li_1.1Mn_1.9O₄ alongside a graphite negative electrode were stored at various depth-of-discharge (DoD) at 60 °C for 1, 2, 4, and 6 months. After storage, the cells were cycled at C/25 at 25 °C between 2.75 and 4.2 V for capacity determination and incremental capacity analysis (ICA). In addition to ICA analysis, the mechanism for capacity fade was investigated by combining the results of neutron powder diffraction under in-situ and operando conditions, in conjunction with post-mortem studies of the electrodes using synchrotron X-ray powder diffraction and inductively-coupled plasma optical emission spectroscopy. Among the cells, those stored at 25% DoD suffered the highest capacity fade due to their higher losses of active Li, NMC, and LMO than cells stored at other DoD. The cells stored at 0% DoD shows second high capacity fade because they exhibit the highest of active LMO and graphite anode among the stored cells and higher losses of active Li and NMC than cells stored at 50% DoD.

将包含层状LiNi _0.5 Mn _0.3 Co _0.2 O ₂和尖晶石Li _1.1 Mn _1.9 O ₄的混合正极以及石墨负极的商用18650锂离子电池在60°C下于各种放电深度（DoD）下存储1、2、4和6个月。储存后，将电池在C / 25下于25°C在2.75和4.2 V之间循环，以进行容量确定和增量容量分析（ICA）。除了ICA分析外，还通过结合原位和操作下中子粉末衍射的结果研究了容量衰减的机理。结合使用同步加速器X射线粉末衍射和电感耦合等离子体发射光谱的电极的事后研究。在这些单元中，以25％的DoD存储的单元比其他在DoD处存储的单元具有更高的活性Li，NMC和LMO损失，从而遭受最大的容量衰减。在0％DoD下存储的电池比在50％DoD下存储的电池具有更高的活性LMO和石墨阳极，并且活性Li和NMC的损耗也更高，这是第二次高容量衰减。