功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2015年
z1期
136-140
,共5页
钟盛文%陈鹏%姚文俐%梅文捷%胡经纬%金柱%刘熙林%王春香
鐘盛文%陳鵬%姚文俐%梅文捷%鬍經緯%金柱%劉熙林%王春香
종성문%진붕%요문리%매문첩%호경위%금주%류희림%왕춘향
锂离子电池%LiNi0.7 Mn0.3O2%XPS%烧结温度%无钴
鋰離子電池%LiNi0.7 Mn0.3O2%XPS%燒結溫度%無鈷
리리자전지%LiNi0.7 Mn0.3O2%XPS%소결온도%무고
lithium ion battery%LiNi0.7 Mn0.3 O2%XPS%sintering temperature%cobalt free
采用共沉淀-高温固相法合成正极材料LiNi0.7 Mn0.3 O 2,利用 X 射线衍射分析(XRD)表征其结构、扫描电子显微镜(SEM)表征其形貌、X 射线光电子能谱(XPS)表征其价态,最终确定了该材料最佳烧成温度为820℃.研究表明,该温度下合成的 LiNi0.7 Mn0.3 O 2具有典型的α-NaFeO 2型层状结构,颗粒形貌呈类球形且分布均匀;XPS 数据表明,LiNi0.7 Mn0.3 O 2中的 Ni 主要以+3价形态存在,Mn 主要以+4价形态存在.室温条件下以0.2 C 倍率在2.75~4.35 V 的电压范围内充放电,首次放电比容量高达188.9 mAh/g,70次循环后容量保持率为95.2%.
採用共沉澱-高溫固相法閤成正極材料LiNi0.7 Mn0.3 O 2,利用 X 射線衍射分析(XRD)錶徵其結構、掃描電子顯微鏡(SEM)錶徵其形貌、X 射線光電子能譜(XPS)錶徵其價態,最終確定瞭該材料最佳燒成溫度為820℃.研究錶明,該溫度下閤成的 LiNi0.7 Mn0.3 O 2具有典型的α-NaFeO 2型層狀結構,顆粒形貌呈類毬形且分佈均勻;XPS 數據錶明,LiNi0.7 Mn0.3 O 2中的 Ni 主要以+3價形態存在,Mn 主要以+4價形態存在.室溫條件下以0.2 C 倍率在2.75~4.35 V 的電壓範圍內充放電,首次放電比容量高達188.9 mAh/g,70次循環後容量保持率為95.2%.
채용공침정-고온고상법합성정겁재료LiNi0.7 Mn0.3 O 2,이용 X 사선연사분석(XRD)표정기결구、소묘전자현미경(SEM)표정기형모、X 사선광전자능보(XPS)표정기개태,최종학정료해재료최가소성온도위820℃.연구표명,해온도하합성적 LiNi0.7 Mn0.3 O 2구유전형적α-NaFeO 2형층상결구,과립형모정류구형차분포균균;XPS 수거표명,LiNi0.7 Mn0.3 O 2중적 Ni 주요이+3개형태존재,Mn 주요이+4개형태존재.실온조건하이0.2 C 배솔재2.75~4.35 V 적전압범위내충방전,수차방전비용량고체188.9 mAh/g,70차순배후용량보지솔위95.2%.
Layered cobalt free nickel rich LiNi0.7 Mn0.3 O 2 cathode material was synthesized via co-precipitation and high temperature sintering in this study.The optimum synthesis condition for LiNi0.7 Mn0.3 O 2 cathode material was investigated in detail.The crystal structure,morphology,valence state of elements and electrochemical performance for LiNi0.7 Mn0.3 O 2 cathode material were characterized and tested by means of powder X-ray dif-fraction (XRD),scanning electron microscopy (SEM),X-ray photoelectron spectroscopy (XPS)and galvanos-tatic charge/discharge test separately.The optimum sintering temperature for LiNi0.7 Mn0.3 O 2 cathode material was 820 ℃.The sample synthesized at optimum sintering temperature has a typical α-NaFeO 2 layered structure and homogeneous spherical morphology.XPS results suggest that Ni3 + and Mn4+ exist mainly in this sample. The initial discharge specific capacity of the material was 188.1 mAh/g at 0.2 C in the voltage range of 2.75-4.35 V,and even after 70 cycles,it still maintains 95.2% of the initial discharge specific capacity.