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High-Entropy Surface Complex Stabilized LiCoO2 Cathode
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-05-04 , DOI: 10.1002/aenm.202300147 Xinghua Tan 1, 2 , Yongxin Zhang 1, 3 , Shenyang Xu 2 , Peihua Yang 4 , Tongchao Liu 5 , Dongdong Mao 1 , Jimin Qiu 2 , Zhefeng Chen 2 , Zhaoxia Lu 3 , Feng Pan 2 , Weiguo Chu 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-05-04 , DOI: 10.1002/aenm.202300147 Xinghua Tan 1, 2 , Yongxin Zhang 1, 3 , Shenyang Xu 2 , Peihua Yang 4 , Tongchao Liu 5 , Dongdong Mao 1 , Jimin Qiu 2 , Zhefeng Chen 2 , Zhaoxia Lu 3 , Feng Pan 2 , Weiguo Chu 1
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Elevating the charge voltage of LiCoO2 increases the energy density of batteries, which is highly enticing in energy storage implementation ranging from portable electronics to e-vehicles. However, hybrid redox reactions at high voltages facilitate oxygen evolution, electrolyte decomposition and irreversible phase change, and accordingly lead to rapid battery capacity decay. Here significantly improved high-voltage cycling stability of Mg-Al-Eu co-doped LiCoO2 is demonstrated. It is found that element co-doping induces a near-surface high-entropy zone, including an innately thin disordered rock-salt shell and a dopant segregation surface. The high-entropy complex can effectively suppress oxygen evolution and near-surface structure deconstruction. The phase change reversibility between O3 and H1-3 and thermal stability of the cathode are greatly enhanced as well. As a result, the co-doped LiCoO2 exhibits a remarkable cycling performance, retaining 86.3% and 72.0% of initial capacity over 800 and 2000 cycles, respectively, with a high cut-off voltage of 4.6 V. The feasible co-doping approach broadens the perspective for the development of stable lithium-ion batteries with high operating voltages.
中文翻译：
高熵表面络合物稳定LiCoO2正极
提高LiCoO 2的充电电压可以提高电池的能量密度，这对于从便携式电子产品到电动汽车的储能实施非常有吸引力。然而，高电压下的混合氧化还原反应会促进氧气析出、电解质分解和不可逆相变，从而导致电池容量快速衰减。Mg-Al-Eu共掺杂LiCoO 2的高电压循环稳定性显着提高被证明。研究发现，元素共掺杂会产生近表面高熵区，包括固有的薄无序岩盐壳和掺杂剂偏析表面。高熵复合物可以有效抑制氧析出和近地表结构解构。O3和H1-3之间的相变可逆性和阴极的热稳定性也大大增强。结果，共掺杂LiCoO 2表现出卓越的循环性能，在800次和2000次循环后分别保留了86.3%和72.0%的初始容量，截止电压为4.6 V。拓宽了开发具有高工作电压的稳定锂离子电池的前景。
更新日期：2023-05-04
中文翻译：
高熵表面络合物稳定LiCoO2正极
提高LiCoO 2的充电电压可以提高电池的能量密度，这对于从便携式电子产品到电动汽车的储能实施非常有吸引力。然而，高电压下的混合氧化还原反应会促进氧气析出、电解质分解和不可逆相变，从而导致电池容量快速衰减。Mg-Al-Eu共掺杂LiCoO 2的高电压循环稳定性显着提高被证明。研究发现，元素共掺杂会产生近表面高熵区，包括固有的薄无序岩盐壳和掺杂剂偏析表面。高熵复合物可以有效抑制氧析出和近地表结构解构。O3和H1-3之间的相变可逆性和阴极的热稳定性也大大增强。结果，共掺杂LiCoO 2表现出卓越的循环性能，在800次和2000次循环后分别保留了86.3%和72.0%的初始容量，截止电压为4.6 V。拓宽了开发具有高工作电压的稳定锂离子电池的前景。
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