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Structure and Electrochemical Properties of xLi2MnO3-(1-x)Li[Ni0.8Co0.15Al0.05]O2 (0.5 ≤ x ≤ 0.8)
Author NameAffiliationE-mail
CHEN Pei-Lei College of Energy, Soochow University, Suzhou, Jiangsu 215006, China  
HUANG Ji-Chun College of Energy, Soochow University, Suzhou, Jiangsu 215006, China  
CHEN Yi-Xin College of Energy, Soochow University, Suzhou, Jiangsu 215006, China  
JI Chong-Xing College of Energy, Soochow University, Suzhou, Jiangsu 215006, China  
ZHU De-Cheng College of Energy, Soochow University, Suzhou, Jiangsu 215006, China  
LI De-Cheng College of Energy, Soochow University, Suzhou, Jiangsu 215006, China lidecheng@suda.edu.cn 
Abstract: A new type of material based on the rich lithium-layered solid solution material system, xLi2MnO3-(1-x)Li[Ni0.8Co0.15Al0.05]O2 (0.5 ≤ x ≤ 0.8) was obtained by spray dry process with post annealing treatment. The effect of x value on the structural and electrochemical properties of the materials was investigated by XRD, SEM, TEM, XPS, EIS and charge-discharge tested. Our results suggested that the crystal structure of the sample gradually changed from layered Li[Ni0.8Co0.15Al0.05]O2 type to Li2MnO3 type with the increase of x. Moreover, the quenching treatment in liquid nitrogen was helpful to improve the electrochemical properties of xLi2MnO3-(1-x)Li[Ni0.8Co0.15Al0.05]O2 (0.5 ≤ x ≤ 0.8), which was attributed to the change in terms of the micro structure and valence of the transit metals caused by quenching. The sample with x=0.6 after quenching treatment showed good electrochemical properties, with above 209 mAh·g-1 of reversible capacity after 100 cycles.
Keywords: lithium-ion batteries  lithium-rich layered solid solution material  liquid-nitrogen quench
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CHEN Pei-Lei,HUANG Ji-Chun,CHEN Yi-Xin,JI Chong-Xing,ZHU De-Cheng,LI De-Cheng.Structure and Electrochemical Properties of xLi2MnO3-(1-x)Li[Ni0.8Co0.15Al0.05]O2 (0.5 ≤ x ≤ 0.8)[J].Chinese Journal of Inorganic Chemistry,2019,35(6):937-946.
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Chinese Journal of Inorganic Chemistry