Conversion of Surface Residual Alkali to Solid Electrolyte to Enable Na-Ion Full Cells with Robust Interfaces

被引：77

作者：

Xu, Weiliang ^{[1
,2
]}

Dang, Rongbin ^{[1
]}

Zhou, Lin ^{[1
,3
]}

Yang, Yang ^{[1
,4
]}

Lin, Ting ^{[1
]}

Guo, Qiubo ^{[1
]}

Xie, Fei ^{[1
]}

Hu, Zilin ^{[1
,4
]}

Ding, Feixiang ^{[1
,3
]}

Liu, Yunpeng ^{[1
,3
,4
]}

Liu, Yuan

Mao, Huican ^{[1
]}

Hong, Juan ^{[2
]}

Zuo, Zhanchun ^{[1
]}

Wang, Xiaoqi ^{[6
]}

Yang, Rui ^{[6
]}

Jin, Xu ^{[6
]}

Hou, Xueyan ^{[1
]}

Lu, Yaxiang ^{[1
,5
]}

Rong, Xiaohui ^{[1
,3
]}

Xu, Ning ^{[2
]}

Hu, Yong-Sheng ^{[1
,2
,3
,4
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Yancheng Inst Technol, Coll Mech Engn, Yancheng 224051, Jiangsu, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Huairou Div, Beijing 101400, Peoples R China

[4] Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China

[5] Chinese Acad Sci, Inst High Energy Phys IHEP, Beijing 100049, Peoples R China

[6] PetroChina, PetroChina Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China

来源：

ADVANCED MATERIALS | 2023年 / 35卷 / 42期

关键词：

Na-ion batteries; residual alkali; reversible phase transitions; solid electrolytes; CATHODE MATERIALS; TRANSITION;

D O I：

10.1002/adma.202301314

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The deposition of volatilized Na+ on the surface of the cathode during sintering results in the formation of surface residual alkali (NaOH/Na2CO3NaHCO3) in layered cathode materials, leading to serious interfacial reactions and performance degradation. This phenomenon is particularly evident in O3-NaNi0.4Cu0.1Mn0.4Ti0.1O2 (NCMT). In this study, a strategy is proposed to transform waste into treasure by converting residual alkali into a solid electrolyte. Mg(CH3COO)(2) and H3PO4 are reacted with surface residual alkali to generate the solid electrolyte NaMgPO4 on the surface of NCMT, which can be labeled as NaMgPO4@NaNi0.4Cu0.1Mn0.4Ti0.1O2-X (NMP@NCMT-X, where X indicates the different amounts of Mg2+ and PO43-). NaMgPO4 acts as a special ionic conductivity channel on the surface to improve the kinetics of the electrode reactions, remarkably improving the rate capability of the modified cathode at a high current density in the half-cell. Additionally, NMP@NCMT-2 enables a reversible phase transition from the P3 to OP2 phase in the charge-discharge process above 4.2 V and achieves a high specific capacity of 157.3 mAh g(-1) and outstanding capacity retention in the full cell. The strategy can effectively and reliably stabilize the interface and improve the performance of layered cathodes for Na-ion batteries (NIBs).

引用

页数：9

共 37 条

[1] The crystal structures of NaMgPO4, Na2CaMg(PO4)2 and Na18Ca13Mg5(PO4)18:: new examples for glaserite related structures [J].