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Pulse High Temperature Sintering to Prepare Single-Crystal High Nickel Oxide Cathodes with Enhanced Electrochemical Performance
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-11-27 , DOI: 10.1002/aenm.202203188 Hao Huang 1 , Lipeng Zhang 1 , Huayang Tian 1 , Junqing Yan 1 , Junfan Tong 1 , Xiaohang Liu 2 , Haoxuan Zhang 2 , Heqin Huang 2 , Shu‐meng Hao 1 , Jian Gao 1 , Le Yu 1 , Hong Li 3 , Jieshan Qiu 1 , Weidong Zhou 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-11-27 , DOI: 10.1002/aenm.202203188 Hao Huang 1 , Lipeng Zhang 1 , Huayang Tian 1 , Junqing Yan 1 , Junfan Tong 1 , Xiaohang Liu 2 , Haoxuan Zhang 2 , Heqin Huang 2 , Shu‐meng Hao 1 , Jian Gao 1 , Le Yu 1 , Hong Li 3 , Jieshan Qiu 1 , Weidong Zhou 1
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For the currently most dominant cathode of Li(NixCoyMnz)O2(NCM, x + y + z = 1) in lithium-ion batteries, higher nickel content brings higher energy density but is accompanied by heavier interfacial reactions with electrolyte and worse safety performance. Single crystal cathode materials have the advantages of fewer grain boundaries, higher density, and greatly suppressed microcracks during cycling, these benefits in turn suppress interfacial side reactions, as well as the improve volumetric energy density and safety performance. Here, a strategy of pulse high-temperature sintering (PHTS) is reported to prepare single-crystal Li(Ni0.9Co0.05Mn0.05)O2 (SC-NCM90), in which an extra PHTS at 1040 °C for 1 min is added in the traditional calcination process at 750 °C, yielding well defined octahedral particles with an initial capacity of 209 mAh g−1. Compared with the counterpart NCM90 secondary spheres, the tap density of SC-NCM90 increases by 1/3 to 2.76 g cm−3 and the microcracks are successfully suppressed, improving both the cycling performance and thermal stability. The calcination time and temperature are optimized, showing that overlong time or overhigh temperature of the PHTS treatment would result in particles with better defined octahedral shape but heavier Li/Ni intermixing and capacity loss.
中文翻译：
脉冲高温烧结制备具有增强电化学性能的单晶高镍氧化物阴极
对于锂离子电池中目前最主要的正极 Li(Ni x Co y Mn z )O 2 (NCM, x + y + z = 1)，更高的镍含量带来更高的能量密度，但伴随着更严重的界面反应电解质和更差的安全性能。单晶正极材料具有晶界少、密度高、循环过程中显着抑制微裂纹等优点，进而抑制界面副反应，提高体积能量密度和安全性能。在此，报道了一种脉冲高温烧结 (PHTS) 策略来制备单晶 Li(Ni 0.9 Co 0.05 Mn 0.05 )O2 (SC-NCM90)，其中在 750 °C 的传统煅烧过程中添加额外的 PHTS 在 1040 °C 下 1 分钟，产生具有 209 mAh g −1初始容量的明确八面体颗粒。与对应的 NCM90 二次球相比，SC-NCM90 的振实密度增加了 1/3 至 2.76 g cm -3并且成功抑制了微裂纹，提高了循环性能和热稳定性。优化了煅烧时间和温度，表明 PHTS 处理的时间过长或温度过高会导致颗粒具有更好的八面体形状，但 Li/Ni 混合和容量损失更严重。
更新日期：2022-11-27
中文翻译：
脉冲高温烧结制备具有增强电化学性能的单晶高镍氧化物阴极
对于锂离子电池中目前最主要的正极 Li(Ni x Co y Mn z )O 2 (NCM, x + y + z = 1)，更高的镍含量带来更高的能量密度，但伴随着更严重的界面反应电解质和更差的安全性能。单晶正极材料具有晶界少、密度高、循环过程中显着抑制微裂纹等优点，进而抑制界面副反应，提高体积能量密度和安全性能。在此，报道了一种脉冲高温烧结 (PHTS) 策略来制备单晶 Li(Ni 0.9 Co 0.05 Mn 0.05 )O2 (SC-NCM90)，其中在 750 °C 的传统煅烧过程中添加额外的 PHTS 在 1040 °C 下 1 分钟，产生具有 209 mAh g −1初始容量的明确八面体颗粒。与对应的 NCM90 二次球相比，SC-NCM90 的振实密度增加了 1/3 至 2.76 g cm -3并且成功抑制了微裂纹，提高了循环性能和热稳定性。优化了煅烧时间和温度，表明 PHTS 处理的时间过长或温度过高会导致颗粒具有更好的八面体形状，但 Li/Ni 混合和容量损失更严重。
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