Raising the cycling stability of aqueous lithium-ion batteries by eliminating oxygen in the electrolyte
Raising the cycling stability of aqueous lithium-ion batteries by eliminating oxygen in the electrolyte
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DOI：
10.1038/nchem.763
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发表时间：
2010-09-01
期刊：
影响因子：
21.8
通讯作者：
Xia, Yong-Yao
中科院分区：
文献类型：
--
作者：
Luo, Jia-Yan;Cui, Wang-Jun;Xia, Yong-Yao
水性锂离子电池可以解决与使用高毒性和易燃有机溶剂的锂离子电池相关的安全问题，以及与商业化的水性可再充电电池（例如铅酸和镍-金属氢化物系统）相关的差的循环寿命。但所有报道的水性锂离子电池系统都表现出较差的稳定性：100次循环后的容量保持率通常低于50%。在此，广泛分析了电极材料在水性电解质中的稳定性。在放电状态下，水性锂离子电池的负极可与水和氧气反应，导致循环时容量衰减。通过除氧、调节电解液pH值和使用碳包覆电极材料，LiTi 2（PO 4）（3）/Li 2SO 4/LiFePO 4水溶液锂离子电池表现出优异的稳定性，在1，在10分钟内完全充电/放电的情况下，即使在8小时的非常低的电流速率下，50次循环后，放电提供了高安全性、低成本、长循环寿命和合适能量密度的能量存储系统。
Aqueous lithium-ion batteries may solve the safety problem associated with lithium-ion batteries that use highly toxic and flammable organic solvents, and the poor cycling life associated with commercialized aqueous rechargeable batteries such as lead-acid and nickel-metal hydride systems. But all reported aqueous lithium-ion battery systems have shown poor stability: the capacity retention is typically less than 50% after 100 cycles. Here, the stability of electrode materials in an aqueous electrolyte was extensively analysed. The negative electrodes of aqueous lithium-ion batteries in a discharged state can react with water and oxygen, resulting in capacity fading upon cycling. By eliminating oxygen, adjusting the pH values of the electrolyte and using carbon-coated electrode materials, LiTi2(PO4)(3)/Li2SO4/LiFePO4 aqueous lithium-ion batteries exhibited excellent stability with capacity retention over 90% after 1,000 cycles when being fully charged/discharged in 10 minutes and 85% after 50 cycles even at a very low current rate of 8 hours for a full charge/discharge offering an energy storage system with high safety, low cost, long cycling life and appropriate energy density.