LiFePO 4 ‐Accelerated Change in Surface and Electrochemical Properties in Aqueous Systems Induced by Mechanical Agitation
LiFePO 4 ‐Accelerated Change in Surface and Electrochemical Properties in Aqueous Systems Induced by Mechanical Agitation
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DOI：
10.1002/ente.201801116
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发表时间：
2019-03
影响因子：
3.8
通讯作者：
Linxiao Geng;Sonia B. Foley;H. Dong;Gary M. Koenig
中科院分区：
文献类型：
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作者：
Linxiao Geng;Sonia B. Foley;H. Dong;Gary M. Koenig
由于安全性和成本优势，电池电极加工从有机溶剂转换为水性溶剂是可取的。磷酸铁锂（LFP）由于其与水的化学相容性，以及作为电池活性材料的有利成本、安全性、电化学性能和环境优势，被认为是用于水处理的阴极材料。所有关于 LFP 在水中稳定性的研究都是在 LFP 在死水中老化或被限制在复合电极内时被水包围的情况下进行的。然而，当 LFP 与水接触并受到机械搅拌时，其电化学性能会加速退化。使用材料表征方法的组合来探测 LFP 的变化。尽管本体颗粒结构和形态没有显着变化，但观察到显着的颗粒表面损伤和成分改变。这些结果表明，LFP 在水性环境中暴露于搅拌的系统，例如在水性电池电极加工或水性浆料电极中，需要仔细研究相关加工条件下 LFP 表面环境的潜在变化。
Switching from organic to aqueous solvents for battery electrode processing is desirable due to both safety and cost advantages. Lithium iron phosphate (LFP) is considered a cathode material for aqueous processing due to its demonstrated chemical compatibility with water, in addition to its favorable cost, safety, electrochemical performance, and environmental advantages as a battery active material. All research on LFP stability in water has been conducted in a scenario where LFP is aged in stagnant water, or surrounded by water when confined within a composite electrode. However, a much accelerated degradation in the electrochemical performance of LFP when it is in contact with water and exposed to mechanical agitation is demonstrated. Changes to LFP are probed using a combination of materials characterization methods. Although there are no significant changes to the bulk particle structure and morphology, significant particle surface damage and compositional modifications are observed. These results suggest that the systems where LFP is exposed to agitation in an aqueous environment, such as in aqueous battery electrode processing or in aqueous slurry electrodes, need to be carefully investigated for potential changes to the LFP surface environment under relevant processing conditions.