文献类型：期刊文献

英文题名：Construction of Potassium-Doped Li 1.6 Mn 1.6 O 4 For Enhancing Lithium Adsorption and Stability From Low-Grade Brine

作者：Bao, Luri[1]; Huang, Zhiai[1]; Liu, Haiyan[1]; Sun, Shu-Ying[1]

机构：[1] National Engineering Research Center for Integrated Utilization of Salt Lake Resource, East China University of Science and Technology, Shanghai, 200237, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240295875)

语种：英文

外文关键词：Adsorption - Dissolution - Doping (additives) - Ions - Lithium - Lithium compounds - Manganese oxide - Sieves

摘要：Spinel-type manganese oxide (LMO) is considered a typical lithium-ion sieve due to its excellent selectivity and high theoretical adsorption capacity. However, its stability and adsorption capacity need further enhancement for practical applications. The design and preparation of potassium-doped Li1.6Mn1.6O4 adsorbents resulted in LMO with octahedral morphology and well-developed (111) crystal faces. This unique crystalline facet structure contributes to the material's remarkable performance and durability in lithium-ion adsorption applications. Additionally, the successful doping of K+ into the material crystals effectively increases the crystal plane spacing, providing excellent adsorption and separation performance for lithium and enabling rapid adsorption kinetics. Compared to the LMO, the K-doped LMO-K-3 exhibits higher adsorption capacity, faster adsorption rate, lower manganese dissolution, and greater stability. Notably, HMO-K-3 demonstrated a significantly improved equilibrium Li uptake capacity of 60.12 mg g?1 within 4 hours. Additionally, in Qarhan brine, the adsorption capacity reached 38.65 mg g-1, while the manganese dissolution rate during pickling was reduced to 0.8%. The material demonstrates excellent recycling ability and selectivity without significant capacity degradation during adsorption/desorption cycles. ? 2024, The Authors. All rights reserved.