高容量正极材料Cr_(8)O_(2)1 的制备及电化学性能  

Preparation and electrochemical performance of high-capacityCr_(8)O_(2)1 cathode material

作　　者：周航毅 侯宏英[1] 吕安 吴润杰 廖浪 ZHOU Hangyi;HOU Hongying;LYU An;WU Runjie;LIAO Lang(Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《电池》2025年第2期215-219,共5页Battery Bimonthly

基　　金：国家自然科学基金(52263010)。

摘　　要：Cr_(8)O_(2)1的理论比容量(642 mAh/g)和工作电位[3.0 V(vs.Li+/Li)]较高,成为高比能量锂离子电池正极材料的研究热点。以CrO_(3)为原料,在空气气氛中经煅烧工艺制备纯相Cr_(8)O_(2)1晶体粉末,利用XRD、X射线光电子能谱(XPS)、SEM及电化学性能测试,研究产物的微观形貌、结构、元素组成及储锂性能。Cr_(8)O_(2)1粉末由平均粒径5μm的不规则颗粒组成,结晶度和纯度高。作为锂离子电池正极材料,以1.0 C放电至1.5 V时,首次放电比容量和比能量分别达到366.5 mAh/g和1008.4 W·h/kg。Cr_(8)O_(2)1 has become a research hot spot of cathode material for high specific energy Li-ion battery due to high theoretical specific capacity(642 mAh/g)and operating potential[3.0 V(vs.Li+/Li)].Pure-phase Cr_(8)O_(2)1 powder is prepared by calcination process in the air atmosphere,the microscopic morphology,structure,elemental composition and Li-storage performance are investigated by XRD,X-ray photoelectron spectroscopy(XPS),SEM and electrochemical performance tests.The Cr_(8)O_(2)1 powder consists of many irregular particles with an average particle size of 5μm,which has high crystallinity and purity.As a cathode material for Li-ion battery,the initial specific discharge capacity and specific energy reach 366.5 mAh/g and 1008.4 W·h/kg,respectively,at 1.0 C discharge to 1.5 V.

关 键 词：锂离子电池 Cr_(8)O_(2)1 正极材料 固体烧结 

分 类 号：TM912.9[电气工程—电力电子与电力传动]