Surface Modification of Li‐Rich Mn‐Based Layered Oxide Cathodes: Challenges, Materials, Methods, and Characterization,Advanced Energy Materials

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Surface Modification of Li‐Rich Mn‐Based Layered Oxide Cathodes: Challenges, Materials, Methods, and Characterization
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-09-27 , DOI: 10.1002/aenm.202002506
Yike Lei ₁ , Jie Ni ₁ , Zijun Hu ₁ , Ziming Wang ₁ , Fukang Gui ₁ , Bing Li ₁ , Pingwen Ming ₁ , Cunman Zhang ₁ , Yuval Elias ₂ , Doron Aurbach ₂ , Qiangfeng Xiao ₁

Affiliation

Rechargeable lithium‐ion batteries have become the dominant power sources for portable electronic devices, and are regarded as the battery technology of choice for electric vehicles and as potential candidates for grid‐scale storage. Commercial lithium‐ion batteries, after three decades of cell engineering, are approaching their energy density limits. Toward continually improving the energy density and reducing cost, Li‐rich Mn‐based layered oxide (LMLO) cathodes are receiving more and more attention due to their high discharge capacity and low cost. However, commercialization has been hampered by severe capacity and voltage decay, sluggish rate capability, and poor safety performance during charge/discharge cycles. Surface modification has effectively adopted to improve the electrochemical performance of LMLO cathodes. In this review, the main problems and recent progress in the field are summarized, focusing on challenges, materials, methods, and characterization techniques. More effective surface modification can be accomplished by strengthening nondestructive in situ measurements, expanding atomic/molecular layer (ALD/MLD) deposition techniques, and adopting fluorinated cosolvents.

中文翻译：

富锂锰基层状氧化物阴极的表面改性：挑战，材料，方法和表征

可充电锂离子电池已成为便携式电子设备的主要电源，被视为电动汽车的首选电池技术和潜在的网格规模存储候选。经过三十年的电池工程后，商用锂离子电池正接近其能量密度极限。为了不断提高能量密度和降低成本，富锂锰基层状氧化物（LMLO）阴极由于其高放电容量和低成本而受到越来越多的关注。然而，商业化已经受到严重的容量和电压衰减，缓慢的速率能力以及在充电/放电循环期间的不良安全性能的阻碍。有效地采用了表面改性以改善LMLO阴极的电化学性能。在这篇评论中总结了该领域的主要问题和最新进展，重点介绍了挑战，材料，方法和表征技术。通过加强非破坏性原位测量，扩展原子/分子层（ALD / MLD）沉积技术以及采用氟化助溶剂，可以实现更有效的表面改性。

更新日期：2020-11-03

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