School of Materials Science & Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China.
ChemSusChem. 2020 Jan 19;13(2):426-433. doi: 10.1002/cssc.201902385. Epub 2019 Dec 5.
The commercial application of high-capacity LiNi Co Mn O is impeded by its inferior cycling stability, which has been attributed to structural instability caused by stress accumulation during both calcination and cycling. A porous structure was deliberately introduced into nickel-rich material particles to relieve such stress. Cross-sectional SEM and mercury penetration tests confirmed the successful construction of a porous structure. Ex situ TEM and powder XRD confirmed that the porous structure reduced the stress concentration regions in uncycled nickel-rich material by providing a buffer space. In addition, the porous structure helps the permeation of the electrolyte and alleviates the stress accumulation during cycling, endowing the nickel-rich cathode materials with enhanced rate capability and suppressed phase transition. This strategy can be extended for the synthesis of diverse nickel-rich cathode materials to improve their cycling stability.
高容量 LiNiCoMnO 的商业应用受到其循环稳定性差的阻碍，这归因于煅烧和循环过程中应力积累引起的结构不稳定。人们有意在富镍材料颗粒中引入多孔结构以缓解这种应力。横截面 SEM 和压汞测试证实了多孔结构的成功构建。非原位 TEM 和粉末 XRD 证实，多孔结构通过提供缓冲空间来减少未循环富镍材料中的应力集中区域。此外，多孔结构有助于电解质的渗透，并缓解循环过程中的应力积累，从而使富镍正极材料具有增强的倍率性能和抑制的相变。该策略可扩展用于合成各种富镍正极材料，以提高其循环稳定性。
