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Olivine-FePO4 preparation for lithium extraction from brines via Electrochemical De-intercalation/Intercalation method
Desalination ( IF 8.3 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.desal.2021.115326
Jiachun Xiong 1 , Lihua He 1, 2 , Dongfu Liu 1 , Wenhua Xu 1 , Zhongwei Zhao 1, 2
Affiliation  

Electrochemical De-intercalation/Intercalation system (EDIs) has attached much attention for lithium extraction from brines. However, the preparation of the matched olivine-FePO4 cathodes faced various problems. Herein, a simple and efficient method by using sodium persulfate for the preparation of olivine-FePO4 was proposed, and the optimal operation conditions (30–40 °C, 0.05–0.10 M Na2S2O8, and 1.5–2 h) was obtained. Furthermore, the relationship between the open-circuit voltage and solution redox potential with the de-lithiation rate was determined, and the value of the solution redox potential can be used for the online monitoring of the preparation of FePO4 electrode. Additionally, the prepared FePO4 electrode exhibited good selectively and cycle performance for lithium extraction. Using it as cathode to extract lithium from West Taijinar brine, the Mg/Li ratio decreased from 54.27 in the brine to 1.65 in obtained anolyte, and the recovery rate of Li+ in brine reached 85.30%. Besides, the average current density of the extraction process reaches 15.65 and 13.11 A·m−2 respectively. In summary, this electrode preparation method has been introduced to be of high preparation efficiency and easy to control, which would be more suitable for industrial applications.



中文翻译:

通过电化学脱嵌/嵌入方法从盐水中提取锂的橄榄石-FePO4 制备

电化学脱嵌/嵌入系统 (EDI) 对从盐水中提取锂给予了很多关注。然而,匹配的橄榄石-FePO 4阴极的制备面临各种问题。在此,提出了一种简单高效的过硫酸钠制备橄榄石-FePO 4 的方法,并给出了最佳操作条件(30-40 °C,0.05-0.10 M Na 2 S 2 O 8,1.5-2 h ) 获得。此外,确定了开路电压和溶液氧化还原电位与脱锂速率的关系,溶液氧化还原电位值可用于FePO 4制备的在线监测电极。此外,所制备的FePO 4电极表现出良好的锂提取选择性和循环性能。用它作为阴极从西泰吉纳尔卤水中提取锂,Mg/Li比从卤水中的54.27下降到得到的阳极液中的1.65,卤水中Li +的回收率达到85.30%。此外,提取过程的平均电流密度分别达到15.65和13.11 A·m -2。综上所述,该电极制备方法制备效率高,易于控制,更适合工业应用。

更新日期:2021-09-17
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