The invention relates to a composite positive pole piece and a preparation method thereof, and an electrochemical device comprising the composite positive pole piece, the composite positive pole piece comprises a current collector layer, an electrode material layer positioned on one side or two sides of the current collector layer, and a lithium-containing compound protection layer positioned on one side of the current collector layer of the raw material of the electrode material layer, and the lithium-containing compound protective layer comprises the following components: a lithium-containing inorganic electrolyte and/or a lithium-containing inorganic-polymer composite electrolyte. The lithium-containing compound protection layer is introduced into the positive pole piece, transition metal ions can be captured in situ, metal elements are inhibited from being dissolved out, and therefore the cycling stability and safety of the high-energy-density lithium ion battery are effectively improved. Meanwhile, the lithium-containing additive is introduced into the electrode material layer, irreversible capacity loss of the silicon-based negative electrode and active lithium consumed by SEI formation can be made up to a certain extent, and the cycle and safety performance of the battery is further improved.
本公开涉及一种复合正极极片及其制备方法、包含其的电化学装置,所述复合正极极片包括集流体层,位于集流体层一侧或两侧的电极材料层,以及位于所述电极材料层原料所述集流体层一侧的含锂化合物保护层,所述含锂化合物保护层的组成成分包括含锂无机电解质和/或含锂无机‑聚合物复合电解质。本公开通过在正极极片中引入含锂化合物保护层,能够原位捕获过渡金属离子,抑制金属元素溶出,从而有效提升高能量密度锂离子电池的循环稳定性和安全性。同时,本公开在电极材料层中引入含锂添加剂,一定程度上能够弥补硅基负极的不可逆容量损失和SEI形成消耗的活性锂,进一步提升电池的循环和安全性能。
Composite positive pole piece, preparation method thereof and electrochemical device comprising composite positive pole piece
一种复合正极极片及其制备方法、包含其的电化学装置
2023-09-12
Patent
Electronic Resource
Chinese
IPC: | H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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