High-Nickel NMA: A Cobalt-Free Alternative to NMC and NCA Cathodes for Lithium-Ion Batteries
High-Nickel NMA: A Cobalt-Free Alternative to NMC and NCA Cathodes for Lithium-Ion Batteries
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DOI：
10.1002/adma.202002718
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发表时间：
2020-07-06
影响因子：
29.4
通讯作者：
Manthiram, Arumugam
中科院分区：
文献类型：
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作者：
Li, Wangda;Lee, Steven;Manthiram, Arumugam
高镍LiNi1-x-yMnxCoyO2（NMC）和LiNi1-x-yCoxAlyO2（NCA）是下一代高能锂离子电池的首选正极材料。NMC和NCA都含有钴，这是一种昂贵而稀缺的金属，通常被认为是其电化学性能所必需的。本文以内部合成的相同镍含量（89 mol%）的NMC、NCA和al - mg共掺NMC （NMCAM）为基准，证明了具有理想电化学性能的高镍LiNi1-x-yMnxAlyO2（NMA）阴极。尽管比容量略低，但高ni NMA在大约40 mV的高电压下工作，并且相对于NMC和NCA在速率能力上没有妥协。在与石墨配对的袋状电池中，高ni NMA的性能优于NMC和NCA，在1000次深度循环后仅略微落后于NMCAM和商业阴极。此外，用差示扫描量热法显示了NMA对NMC、NCA和NMCAM的优越热稳定性。考虑到高镍NMA与NCA和NMC非常相似的成分调整灵活性和即时合成可扩展性，本研究为下一代高能无钴锂离子电池的正极材料开发开辟了新的空间。
High-nickel LiNi1-x-yMnxCoyO2(NMC) and LiNi1-x-yCoxAlyO2(NCA) are the cathode materials of choice for next-generation high-energy lithium-ion batteries. Both NMC and NCA contain cobalt, an expensive and scarce metal generally believed to be essential for their electrochemical performance. Herein, a high-Ni LiNi1-x-yMnxAlyO2(NMA) cathode of desirable electrochemical properties is demonstrated benchmarked against NMC, NCA, and Al-Mg-codoped NMC (NMCAM) of identical Ni content (89 mol%) synthesized in-house. Despite a slightly lower specific capacity, high-Ni NMA operates at a higher voltage by approximate to 40 mV and shows no compromise in rate capability relative to NMC and NCA. In pouch cells paired with graphite, high-Ni NMA outperforms both NMC and NCA and only slightly trails NMCAM and a commercial cathode after 1000 deep cycles. Further, the superior thermal stability of NMA to NMC, NCA, and NMCAM is shown using differential scanning calorimetry. Considering the flexibility in compositional tuning and immediate synthesis scalability of high-Ni NMA very similar to NCA and NMC, this study opens a new space for cathode material development for next-generation high-energy, cobalt-free Li-ion batteries.