Electrode, preparation method thereof and battery

Abstract

The invention belongs to the technical field of energy devices, and particularly relates to an electrode, a preparation method thereof and a battery. The electrode provided by the invention comprises a current collector and an electrode material layer, the electrode material layer is arranged on the current collector, the electrode material layer comprises at least two lamination units, and the lamination units are sequentially laminated along the thickness direction of the electrode material layer; and the laminated unit closest to the current collector is marked as L1, the electrode material layer farthest from the current collector is marked as Lm, and the multiple laminated units arranged between L1 and Lm are sequentially named as L2,..., Lm-1 according to the sequence of the distances between the laminated units and the current collector from near to far, wherein the projection area of the laminated unit on the current collector is as follows: L1>L2>...>Lm-1>Lm. Therefore, the anti-layering capability of the interface between the electrode material layer and the current collector is effectively enhanced, so that the negative influence of huge volume change of electrode materials such as a silicon-based negative electrode material on the battery performance in the lithium embedding/removing process is reduced. 本发明属于能源装置技术领域，尤其涉及一种电极及其制备方法、电池。本发明提供的电极，包括：集流体和电极材料层，电极材料层设置在集流体上，且电极材料层包括至少两个叠层单元，叠层单元沿电极材料层的厚度方向依次层叠设置；将距离集流体最近的叠层单元标记为L1，将距离集流体最远的电极材料层标记为Lm，按照叠层单元与集流体的距离由近到远的顺序，将设置在L1和Lm之间的多个叠层单元依次命名为L2、…、Lm‑1；其中，叠层单元在集流体上的投影面积大小为：L1＞L2＞…＞Lm‑1＞Lm。如此，有效增强了电极材料层与集流体间界面的抗分层能力，从而减轻嵌锂/脱锂过程中如硅基负极材料等电极材料巨大的体积变化对电池性能的负面影响。