Improving the Structure and Cycling Stability of Ni-Rich Layered Cathodes by Dual Modification of Yttrium Doping and Surface Coating

Citations Over TimeTop 10% of 2020 papers

Abstract

A crucial challenge for the commercialization of Ni-rich layered cathodes (LiNi_0.88Co_0.09Al_0.03O₂) is capacity decay during the cycling process, which originates from their interfacial instability and structural degradation. Herein, a one-step, dual-modified strategy is put forward to in situ synthesize the yttrium (Y)-doped and yttrium orthophosphate (YPO₄)-modified LiNi_0.88Co_0.09Al_0.03O₂ cathode material. It is confirmed that the YPO₄ coating layer as a good ion conductor can stabilize the solid-electrolyte interface, while the formative strong Y-O bond can bridle TM-O slabs to intensify the lattice structure in the state of deep delithium (>4.3 V). In particular, both the combined advantages effectively withstand the anisotropic strain generated upon the H2-H3 phase transition and further alleviate the crack generation in unit-cell dimensions, assuring a high-capacity delivery and fast Li+ diffusion kinetics. This dual-modified cathode shows advanced cycling stability (94.1% at 1C after 100 cycles in 2.7-4.3 V), even at a high cutoff voltage and high rate, and advanced rate capability (159.7 mAh g-1 at 10C). Therefore, it provides a novel solution to achieve both high capacity and highly stable cyclability in Ni-rich cathode materials.

Related Papers

• → Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition(2018)61 cited
• → Characteristics of Utility Cyclists in Queensland, Australia: An Examination of the Associations Between Individual, Social, and Environmental Factors and Utility Cycling(2012)47 cited
• → The Effect of Cycling Intensity on Cycling Economy During Seated and Standing Cycling(2016)8 cited
• OXIDATION OF PURE YTTRIUM AND TWO Fe-Y ALLOYS IN 0.1MPa O_2 AT 600～800℃(1999)
• Study on Preparation and Properties of Yttrium Isopropoxide(2000)