文献类型：期刊文献

英文题名：Constructing high performance Li-rich Mn-based cathode via surface phase structure controlling and ion doping

作者：Cao, Shuang[1];Chen, Jiarui[1];Li, Heng[1];Li, Zhi[1];Guo, Changmeng[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, Natl Local Joint Engn Lab Key Mat New Energy Stora, Hunan Prov Key Lab Electrochem Energy Storage & Co, 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, Natl Local Joint Engn Lab Key Mat New Energy Stora, Hunan Prov Key Lab Electrochem Energy Storage & Co, Sch Chem,Natl Base Int Sci & Technol Cooperat, Xiangtan 411105, Peoples R China

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

年份：2023

卷号：555

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20224713148838);Scopus(收录号：2-s2.0-85142168948);WOS:【SCI-EXPANDED(收录号:WOS:000892217200002)】；

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 Mn-based cathode material; In-situ spinel surface conversion film; Na doping; Voltage decay; Capacity fading

摘要：Li-rich Mn-based cathode materials are one kind of the promising potential candidates to electric vehicles powered by high-energy density lithium-ion batteries due to its much higher theoretical energy density. Unfortunately, the rapid capacity fading and voltage decay are the most critical factors affecting its practical application. Herein, Li1.17Na0.02Mn0.54Ni0.13Co0.13O2 (PN-LMNCO) is prepared via surface phase structure controlling and ion doping through an architecture strategy of surface lithium deficiency. It is found that the existence of lithium deficiencies can induce surface phase transformation, and thus resulting in an in-situ spinel surface conversion film, which can restrain the structure degradation during subsequent charge/discharge process. In addition, because of the larger ion radius than Li+, Na+ doping can effectively increase the spacing between Li layers, and thus improve the rate capacity. Accordingly, the as-prepared sample displays as a significantly higher initial coulombic efficiency (91.2%). After 200 cycles at 1 C, the PN-LMNCO can retain 94.7% discharge specific capacity. Furthermore, PN-LMNCO can still show a good discharge capacity of 214 mA h g(-1) even at a high current rate of 5 C. Therefore, this work can preferably meet the need of the development of electric vehicle for high-energy density Lithium-ion battery.