Applying spent lithium iron phosphate battery as raw material,valuable metals in spent lithium ion battery were effectively recovered through separation of active material,selective leaching,and stepwise chemical prec...Applying spent lithium iron phosphate battery as raw material,valuable metals in spent lithium ion battery were effectively recovered through separation of active material,selective leaching,and stepwise chemical precipitation.Using stoichiometric Na2S2O8 as an oxidant and adding low-concentration H2SO4 as a leaching agent was proposed.This route was totally different from the conventional methods of dissolving all of the elements into solution by using excess mineral acid.When experiments were done under optimal conditions(Na2S2O8-to-Li molar ratio 0.45,0.30 mol/L H2SO4,60℃,1.5 h),leaching efficiencies of 97.53% for Li^+,1.39%for Fe^3+,and 2.58% for PO4^3−were recorded.FePO4 was then recovered by a precipitation method from the leachate while maintaining the pH at 2.0.The mother liquor was concentrated and maintained at a temperature of approximately 100℃,and then a saturated sodium carbonate solution was added to precipitate Li2CO3.The lithium recovery yield was close to 80%.展开更多
磷酸铁锂电池热失控是当前大规模电化学储能系统安全运行面临的主要挑战之一。该文提出了一种用于热失控过程中方形铝壳磷酸铁锂电池内部状态监测的原位超声透射方法,并结合温度、电压、电流、表面形变等多参数检测技术,构建了电池热失...磷酸铁锂电池热失控是当前大规模电化学储能系统安全运行面临的主要挑战之一。该文提出了一种用于热失控过程中方形铝壳磷酸铁锂电池内部状态监测的原位超声透射方法,并结合温度、电压、电流、表面形变等多参数检测技术,构建了电池热失控内-外参量综合测试系统。研究了电池在不同工况下内外参量变化特性,讨论了超声信号对电池内部演变的响应机制,实现了不同工况下电池内部状态的精确监测。结果表明,超声信号强度(U_(rms))和超声飞行时间(time of flight,TOF)能够有效表征电池内部状态的变化,其中U_(rms)对电池温度和荷电状态(state-of-charge,SOC)的变化更为敏感。电池过充会显著增强超声信号衰减效果,且信号被噪声淹没的时间节点远早于防爆阀开启时间,表明超声信号可作为电池过充热失控的早期预警指标。在此基础上,提出了基于改进马田系统的电池过充热失控预警算法,提前30 min预测电池防爆阀的开启。该研究工作对于深入认识储能电池热失控的时空发展特性,提升热失控的早期预警技术具有重要意义。展开更多
基金Project(Z20160605230001)supported by Hunan Province Non-ferrous Fund Project,China。
文摘Applying spent lithium iron phosphate battery as raw material,valuable metals in spent lithium ion battery were effectively recovered through separation of active material,selective leaching,and stepwise chemical precipitation.Using stoichiometric Na2S2O8 as an oxidant and adding low-concentration H2SO4 as a leaching agent was proposed.This route was totally different from the conventional methods of dissolving all of the elements into solution by using excess mineral acid.When experiments were done under optimal conditions(Na2S2O8-to-Li molar ratio 0.45,0.30 mol/L H2SO4,60℃,1.5 h),leaching efficiencies of 97.53% for Li^+,1.39%for Fe^3+,and 2.58% for PO4^3−were recorded.FePO4 was then recovered by a precipitation method from the leachate while maintaining the pH at 2.0.The mother liquor was concentrated and maintained at a temperature of approximately 100℃,and then a saturated sodium carbonate solution was added to precipitate Li2CO3.The lithium recovery yield was close to 80%.
文摘磷酸铁锂电池热失控是当前大规模电化学储能系统安全运行面临的主要挑战之一。该文提出了一种用于热失控过程中方形铝壳磷酸铁锂电池内部状态监测的原位超声透射方法,并结合温度、电压、电流、表面形变等多参数检测技术,构建了电池热失控内-外参量综合测试系统。研究了电池在不同工况下内外参量变化特性,讨论了超声信号对电池内部演变的响应机制,实现了不同工况下电池内部状态的精确监测。结果表明,超声信号强度(U_(rms))和超声飞行时间(time of flight,TOF)能够有效表征电池内部状态的变化,其中U_(rms)对电池温度和荷电状态(state-of-charge,SOC)的变化更为敏感。电池过充会显著增强超声信号衰减效果,且信号被噪声淹没的时间节点远早于防爆阀开启时间,表明超声信号可作为电池过充热失控的早期预警指标。在此基础上,提出了基于改进马田系统的电池过充热失控预警算法,提前30 min预测电池防爆阀的开启。该研究工作对于深入认识储能电池热失控的时空发展特性,提升热失控的早期预警技术具有重要意义。
