Effect of calcining oxygen pressure gradient on properties of LiNi0.8Co0.15Al0.05O2 cathode materials for lithium ion batteries
Effect of calcining oxygen pressure gradient on properties of LiNi0.8Co0.15Al0.05O2 cathode materials for lithium ion batteries
复制标题
煅烧氧气压力梯度对锂离子电池正极材料LiNi0.8Co0.15Al0.05O2性能的影响
DOI：
10.1016/j.electacta.2020.135654
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发表时间：
2020-02-20
影响因子：
6.6
通讯作者：
Wang, Changjun
中科院分区：
文献类型：
--
作者：
Nie, Yan;Xiao, Wei;Wang, Changjun
为了了解煅烧压力梯度对LiNi0.8Co0.15Al0.05O2 (NCA)结构、形貌和电化学性能的影响，采用共沉淀法制备的LiNi0.8Co0.15Al0.05 (OH)(2)前驱体在逐渐升高的氧气压力下进行煅烧，以制备不同的正极材料。 X射线衍射和扫描电镜表征结果表明，当煅烧氧气压力为0.6 MPa时，材料(NCA-0.6)具有最佳的综合性能，此时I(003)/I(104)和D-50值分别为1.727和11.06 μm。采用NCA-0.6组装的电池，在1.0 C下循环100次后，放电比容量为143.3 mAh g(-1)，容量保持率为80.3%。此外，与NCA-0.1的1953.2 Omega和0.26 V相比，其电阻更低，为327.5 Omega，氧化还原峰差为0.11 V。这些结果表明，适当提高煅烧氧气压力是提高NCA材料循环稳定性的有效途径，无需任何修改方法。 (C) 2020 Elsevier Ltd. 保留所有权利。
To understand the effects of the calcining pressure gradient on the structure, morphology, and electrochemical properties of LiNi0.8Co0.15Al0.05O2 (NCA), LiNi0.8Co0.15Al0.05 (OH)(2) precursors prepared using a coprecipitation method are calcined under gradually increasing oxygen pressures to fabricate different cathode materials. The results of characterization using X-ray diffraction and scanning electron microscopy suggest that the material (NCA-0.6) possesses the best comprehensive properties when the calcining oxygen pressure is 0.6 MPa, at which the values of I(003)/I(104) and D-50 are appropriately 1.727 and 11.06 mu m, respectively. A cell assembled with NCA-0.6 delivers a discharge specific capacity of 143.3 mAh g(-1) with a capacity retention ratio of 80.3% after 100 cycles at 1.0 C. Moreover, it presents a lower resistance of 327.5 Omega and redox peak difference of 0.11 V compared to the values of 1953.2 Omega and 0.26 V for NCA-0.1. These results suggest that appropriately enhancing the calcining oxygen pressure is an effective way to improve the cycle stability of NCA materials without any modified method. (C) 2020 Elsevier Ltd. All rights reserved.