Cr_(8)O_(21)具有较高的理论比容量(642mAh/g)和工作电压(3.0V vs Li^(+)/Li)等诸多优点,成为高比能量一次锂电池正极材料的研究热点,但目前尚未有可靠的大规模批量制备技术。鉴于此,以CrO_(3)为原料,将原料从2g逐步增加到300g制备Cr_(8...Cr_(8)O_(21)具有较高的理论比容量(642mAh/g)和工作电压(3.0V vs Li^(+)/Li)等诸多优点,成为高比能量一次锂电池正极材料的研究热点,但目前尚未有可靠的大规模批量制备技术。鉴于此,以CrO_(3)为原料,将原料从2g逐步增加到300g制备Cr_(8)O_(21)电极材料,并研究其微观形貌、结构、元素组成及放电性能。结果表明,当原料增加到200g时,其放电性能略有降低,在1.0C放电时的放电比容量和放电能量密度分别高达270.1mAh/g和733.4Wh/kg。当原料增加到250g和300g时,开始有杂质相Cr_(2)O_(5)生成,放电比容量分别降到172.50mAh/g和81.45mAh/g。展开更多
电池的荷电状态(state of charge,SOC)和健康状态(state of health,SOH)作为电动汽车动力电池的重要指标,准确估计SOC与SOH对确保电动汽车运行高效、安全以及稳定有着重要意义。由于SOC与SOH之间有着耦合关系,单独估计SOC或SOH都会造成...电池的荷电状态(state of charge,SOC)和健康状态(state of health,SOH)作为电动汽车动力电池的重要指标,准确估计SOC与SOH对确保电动汽车运行高效、安全以及稳定有着重要意义。由于SOC与SOH之间有着耦合关系,单独估计SOC或SOH都会造成估计精度的影响,因此联合估计SOC与SOH是当前迫切需要解决的问题。联合估计策略主要分为基于模型方法、数据驱动方法以及混合方法,并对每类方法进行了分析与总结,最后阐述了SOC与SOH联合估计的发展趋势。展开更多
SnO_(2)-based anodes for lithium-ion batteries(LIBs)experience volume expansion,leading to rapid capacity decay and low conductivity.To address this problem,a composite consists of C/SnO_(2) with a core-shell structur...SnO_(2)-based anodes for lithium-ion batteries(LIBs)experience volume expansion,leading to rapid capacity decay and low conductivity.To address this problem,a composite consists of C/SnO_(2) with a core-shell structure and a carbonized nitrogen-doped Co-metal organic framework(Co-MOF)(NC)supported on carbon cloth(CC)was designed and prepared,which was denoted as C/SnO_(2)@NC@CC.C/SnO_(2)@NC@CC could be used directly as a flexible anode for LIBs.The combination of core-shell structure centered on carbon spheres,carbonized nitrogen-doped Co-MOF,and CC not only restricts the volume expansion but also functions as conductive networks to improve the electrical conductivity.C/SnO_(2)@NC@CC exhibits excellent electrochemical performance with charge and discharge specific capacities of 2066.0 and 2077.1 mAh/g,respectively,after 120 cycles at a current density of 0.5 A/g.展开更多
文摘Cr_(8)O_(21)具有较高的理论比容量(642mAh/g)和工作电压(3.0V vs Li^(+)/Li)等诸多优点,成为高比能量一次锂电池正极材料的研究热点,但目前尚未有可靠的大规模批量制备技术。鉴于此,以CrO_(3)为原料,将原料从2g逐步增加到300g制备Cr_(8)O_(21)电极材料,并研究其微观形貌、结构、元素组成及放电性能。结果表明,当原料增加到200g时,其放电性能略有降低,在1.0C放电时的放电比容量和放电能量密度分别高达270.1mAh/g和733.4Wh/kg。当原料增加到250g和300g时,开始有杂质相Cr_(2)O_(5)生成,放电比容量分别降到172.50mAh/g和81.45mAh/g。
文摘电池的荷电状态(state of charge,SOC)和健康状态(state of health,SOH)作为电动汽车动力电池的重要指标,准确估计SOC与SOH对确保电动汽车运行高效、安全以及稳定有着重要意义。由于SOC与SOH之间有着耦合关系,单独估计SOC或SOH都会造成估计精度的影响,因此联合估计SOC与SOH是当前迫切需要解决的问题。联合估计策略主要分为基于模型方法、数据驱动方法以及混合方法,并对每类方法进行了分析与总结,最后阐述了SOC与SOH联合估计的发展趋势。
基金National Natural Science Foundation of China(No.61376017)。
文摘SnO_(2)-based anodes for lithium-ion batteries(LIBs)experience volume expansion,leading to rapid capacity decay and low conductivity.To address this problem,a composite consists of C/SnO_(2) with a core-shell structure and a carbonized nitrogen-doped Co-metal organic framework(Co-MOF)(NC)supported on carbon cloth(CC)was designed and prepared,which was denoted as C/SnO_(2)@NC@CC.C/SnO_(2)@NC@CC could be used directly as a flexible anode for LIBs.The combination of core-shell structure centered on carbon spheres,carbonized nitrogen-doped Co-MOF,and CC not only restricts the volume expansion but also functions as conductive networks to improve the electrical conductivity.C/SnO_(2)@NC@CC exhibits excellent electrochemical performance with charge and discharge specific capacities of 2066.0 and 2077.1 mAh/g,respectively,after 120 cycles at a current density of 0.5 A/g.
