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Stabilizing the Structure of Nickel‐Rich Lithiated Oxides via Cr Doping as Cathode with Boosted High‐Voltage/Temperature Cycling Performance for Li‐Ion Battery
Energy Technology ( IF 3.6 ) Pub Date : 2019-09-25 , DOI: 10.1002/ente.201900498 Ya-Di Xu 1, 2 , Jun Zhang 3 , Zhen-Guo Wu 2 , Chun-Liu Xu 2 , Yong-Chun Li 2 , Wei Xiang 1, 3 , Yuan Wang 2 , Yan-Jun Zhong 2 , Xiao-Dong Guo 2 , Hong Chen 4
Energy Technology ( IF 3.6 ) Pub Date : 2019-09-25 , DOI: 10.1002/ente.201900498 Ya-Di Xu 1, 2 , Jun Zhang 3 , Zhen-Guo Wu 2 , Chun-Liu Xu 2 , Yong-Chun Li 2 , Wei Xiang 1, 3 , Yuan Wang 2 , Yan-Jun Zhong 2 , Xiao-Dong Guo 2 , Hong Chen 4
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Structural degradation is a crucial issue, accounting for capacity fading and safety concerns of Ni‐rich cathodes, especially at high temperature and high cutoff cell potential. Herein, Cr3+ is used as a dopant to stabilize the structure, as well as enhance the cycling life, of LiNi0.6Co0.2Mn0.2O2. The effective bulk Cr3+ doping is confirmed via various analysis characterizations. Results demonstrate that a moderate amount of Cr3+ can not only expand pathways for Li‐ion insertion and extraction, but also suppress cation mixing. Electrochemical test results show that the electrochemical performance of the moderate amount of Cr3+‐doped material is remarkably improved, especially under harsh conditions. In the cell potential range of 2.7–4.3 V, the 1 mol% Cr‐doped LiNi0.6Co0.2Mn0.2O2 exhibits 100.6 g−1 after 200 cycles at 10 C, corresponding to 93.1% of the initial cycle. In the cell potential range of 2.7–4.5 V, the cathode still exhibits 166.8 mAh g−1 and keeps 75.0% of the initial value at the 200th cycle at 3 C and 50 °C, whereas the discharge capacity of pristine LiNi0.6Co0.2Mn0.2O2 quickly decreases to 31.5 mAh g−1.
中文翻译：
通过Cr掺杂作为阴极稳定富镍的锂氧化物的结构，并提高了锂离子电池的高温/高温循环性能
结构退化是一个关键问题，考虑到富镍阴极的容量衰减和安全问题，尤其是在高温和高截止电池电势下。此处，Cr 3+被用作掺杂剂以稳定LiNi 0.6 Co 0.2 Mn 0.2 O 2的结构并延长循环寿命。有效的本体Cr 3+掺杂通过各种分析表征得到证实。结果表明适量的Cr 3+不仅可以扩展锂离子插入和提取的途径，而且可以抑制阳离子混合。电化学测试结果表明，适量的Cr 3+的电化学性能掺杂材料得到了显着改善，尤其是在恶劣条件下。在2.7-4.3 V的电池电势范围内，在10 C下200次循环后，1 mol％Cr掺杂的LiNi 0.6 Co 0.2 Mn 0.2 O 2表现出100.6 g -1，相当于初始循环的93.1％。在2.7–4.5 V的电池电势范围内，阴极仍显示166.8 mAh g -1，并且在3 C和50°C下在第200个循环时仍保持初始值的75.0％，而原始LiNi 0.6 Co 0.2的放电容量Mn 0.2 O 2迅速降低至31.5mAh g -1。
更新日期：2019-09-25
中文翻译：
通过Cr掺杂作为阴极稳定富镍的锂氧化物的结构，并提高了锂离子电池的高温/高温循环性能
结构退化是一个关键问题，考虑到富镍阴极的容量衰减和安全问题，尤其是在高温和高截止电池电势下。此处，Cr 3+被用作掺杂剂以稳定LiNi 0.6 Co 0.2 Mn 0.2 O 2的结构并延长循环寿命。有效的本体Cr 3+掺杂通过各种分析表征得到证实。结果表明适量的Cr 3+不仅可以扩展锂离子插入和提取的途径，而且可以抑制阳离子混合。电化学测试结果表明，适量的Cr 3+的电化学性能掺杂材料得到了显着改善，尤其是在恶劣条件下。在2.7-4.3 V的电池电势范围内，在10 C下200次循环后，1 mol％Cr掺杂的LiNi 0.6 Co 0.2 Mn 0.2 O 2表现出100.6 g -1，相当于初始循环的93.1％。在2.7–4.5 V的电池电势范围内，阴极仍显示166.8 mAh g -1，并且在3 C和50°C下在第200个循环时仍保持初始值的75.0％，而原始LiNi 0.6 Co 0.2的放电容量Mn 0.2 O 2迅速降低至31.5mAh g -1。
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