论文标题
li [Ni，Mn，Co] o2 li-ion电池中的表面化学的原子尺度演变存储在空气中
Atomic scale evolution of the surface chemistry in Li[Ni,Mn,Co]O2 cathode for Li-ion batteries stored in air
论文作者
论文摘要
分层的二氧化硅（M = Ni，Co，Mn和Al混合物）的阴极材料被认为是通过其表面高反应性的，在暴露于环境空气时，化学反应迅速变化。但是，基于电子/光谱的传统技术或热重分析无法捕获脆弱的LI物种的基本原子规模化学。为了研究原子量表表面组成的演变，在这里我们使用原子探针断层扫描，并探测了在lini0.8mn0.1co0.1O2（NMC811）阴极材料暴露时形成的表面物种。组成分析证明了li2co3的形成。 NMC811粒子破裂区域的现场特定检查也表明LI2CO3的主要存在。这些见解将有助于设计改进的阴极合成和细胞组件的协议，以及阴极降解的关键知识
Layered LiMO2 (M = Ni, Co, Mn, and Al mixture) cathode materials used for Li-ion batteries are reputed to be highly reactive through their surface, where the chemistry changes rapidly when exposed to ambient air. However, conventional electron/spectroscopy-based techniques or thermogravimetric analysis fails to capture the underlying atom-scale chemistry of vulnerable Li species. To study the evolution of the surface composition at the atomic scale, here we use atom probe tomography and probed the surface species formed during exposure of a LiNi0.8Mn0.1Co0.1O2 (NMC811) cathode material to air. The compositional analysis evidences the formation of Li2CO3. Site specific examination from a cracked region of an NMC811 particle also suggests the predominant presence of Li2CO3. These insights will help to design improved protocols for cathode synthesis and cell assembly, as well as critical knowledge for cathode degradation
