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Molten salts assisted synthesis of single crystalline NCM811 with surface modification for high energy density lithium-ion batteries 认领 引用 被引量：3
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作者 Bi-Fu Sheng Jun-Jie Lu +9 位作者 Zhe-Fei Sun Min-Feng Chen Min Xu Han-Rui Zhao Qing-Qing Zhou Chu-Yang Li Bin Wang Qiao-Bao Zhang Ji-Zhang Chen Xiang Han 《Rare Metals》 SCIE EI CAS CSCD 2025年第6期3749-3760,共12页
Single crystalline nickel rich Li[NixCoyMn1-x–y]O2(SCNCM)layered oxide cathodes show higher ionic conductivity and better structure integrity than polycrystalline NCM(PCNCM)cathodes by eliminating grain b... Single crystalline nickel rich Li[NixCoyMn1-x–y]O2(SCNCM)layered oxide cathodes show higher ionic conductivity and better structure integrity than polycrystalline NCM(PCNCM)cathodes by eliminating grain boundaries.However,it remains challenges in the controlled synthesis process and restricted cycling stability of SCNCM.Herein,take single crystalline nickel rich Li[Ni0.8Co0.1Mn0.1]O2(SC811)as an example,a dual molten salts(LiOH and Li2SO4)assisted secondary calcination method is proposed,for which LiOH salt improves primary crystal size and Li2SO4prevents the aggravation of NCM nanocrystals.To further reduce the interfacial side reactions,Mg-doping and B-coating surface modification was carried out,which effectively suppress anisotropic lattice changes and Li/Ni disorder.In addition,a thin and uniform H3BO3coating effectively prevents direct contact between the electrode and electrolyte,thus reducing harmful parasitic reactions.The single crystal structure engineering and surface modification strategy of oxide layered cathodes significantly improve the cycling stability of the modified SC811 cathode.For example,during a long-term cycling of 470 cycles,a high-capacity retention of 74.2%obtained at 1C rate.Our work provides a new strategy for engineering high energy nickel rich layered oxide NCM cathodes. 展开更多
关键词 Lithium-ion battery Nickel rich cathode Molten salts Surface modification
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