文献类型：期刊文献

英文题名：Suppressing the Voltage Decay Based on a Distinct Stacking Sequence of Oxygen Atoms for Li-Rich Cathode Materials

作者：Cao, Shuang[1];Wu, Chao[1];Xie, Xin[1];Li, Heng[1];Zang, Zihao[1];Li, Zhi[1];Chen, Gairong[2];Guo, Xiaowei[2];Wang, Xianyou[1]

第一作者：Cao, Shuang

通讯作者：Wang, XY[1]

机构：[1]Xiangtan Univ, Hunan Prov Key Lab Electrochem Energy Storage & C, Natl Local Joint Engn Lab Key Mat New Energy Stor, Sch Chem,Natl Base Int Sci & Technol Cooperat, Xiangtan 411105, Peoples R China;[2]Xinxiang Univ, Sch Chem & Mat Engn, Xinxiang 453003, Henan, Peoples R China

第一机构：Xiangtan Univ, Hunan Prov Key Lab Electrochem Energy Storage & C, Natl Local Joint Engn Lab Key Mat New Energy Stor, Sch Chem,Natl Base Int Sci & Technol Cooperat, Xiangtan 411105, Peoples R China

通讯机构：[1]corresponding author), Xiangtan Univ, Hunan Prov Key Lab Electrochem Energy Storage & C, Natl Local Joint Engn Lab Key Mat New Energy Stor, Sch Chem,Natl Base Int Sci & Technol Cooperat, Xiangtan 411105, Peoples R China.

年份：2021

卷号：13

期号：15

起止页码：17639-17648

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20211810297112);Scopus(收录号：2-s2.0-85104907913);WOS:【SCI-EXPANDED(收录号:WOS:000643578300046)】；

基金：This work was supported financially by the National Natural Science Foundation of China (no. U19A2018) and the Key Project of Strategic New Industry of Hunan Province (no. 2019GK2032).

语种：英文

外文关键词：Li-rich cathode materials; F-doped O2-type material; voltage decay; rate capability; high-energy density Li-ion batteries

摘要：Li-rich cathode materials possess a much higher theoretical energy density than all intercalated cathode materials currently reported and thus are considered as the most promising candidate for next-generation high-energy density Li-ion batteries. However, the rapid voltage decay and the irreversible phase transition of O3-type Li-rich cathode materials often lessen their actual energy density and limit their practical applications, and thus, effectively suppressing the voltage decay of Li-rich cathodes becomes the hotspot of the current research. Herein, the F-doped O2-type Li-rich cathode materials Li1.2Mn0.54Ni0.13Co0.13O2+delta-xFx (F-O2-LRO) are designed and prepared based on the P2-type sodium-ion cathode materials Na5/6Li1/4(Mn0.54Ni0.13Co0.13)(3/4)-O2+delta (Na-LRO) by ion exchange. It has been found that the as-prepared F-O2-LRO exhibits excellent electrochemical performance, for example, a high discharge specific capacity of 280 mA h g(-1) at 0.1 C with an initial Coulombic efficiency of 94.4%, which is obviously higher than the original LRO (77.2%). After 100 cycles, the F-O2-LRO cathode can still maintain a high capacity retention of 95% at a rate of 1 C, while the capacity retention of the original LRO is only 69.1% at the same current rate. Furthermore, the voltage difference (Delta V) of F-O2-LRO before and after cycling is only 0.268 V after 100 cycles at 1 C, which is less than that of the LRO cathode (0.681 V), indicating much lower polarization. Besides, even at a high current rate of 5 C, F-O2-LRO still displays a satisfactory discharge capacity of 210 mA h g(-1) with a capacity retention of 90.1% after 100 cycles. Therefore, this work put forward a new strategy for the development and industrial application of Li-rich cathode materials in high-energy Li-ion batteries.