Negative pole piece, preparation method thereof and electrochemical device

• Main Authors: WANG CONG, CHEN ZHIHUAN, YAN LONG, ZOU YUN, NIU YAQI, PAN FUZHONG
• Format: Patent
• Language: Chinese; English
• Published: 28.06.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a negative pole piece, a preparation method thereof and an electrochemical device, the negative pole piece comprises a current collector, a first active layer, a second active layer and a third active layer which are stacked in sequence, the first active layer is made of a first active carbon material; the second active layer is made of a silicon material and a second active carbon material; and the material of the third active layer comprises a third active carbon material. The invention aims to solve the problem of poor stability of the silicon-containing negative plate. 本发明提供一种负极极片及其制备方法和电化学装置，所述负极极片包括依次层叠设置的集流体、第一活性层、第二活性层以及第三活性层，其中：所述第一活性层的材质包括第一活性碳材料；所述第二活性层的材质包括硅材料和第二活性碳材料；所述第三活性层的材质包括第三活性碳材料。本发明旨在解决含硅负极片的稳定性差的问题。