物理化学学报
物理化學學報
물이화학학보
ACTA PHYSICO-CHIMICA SINICA
2011年
11期
2593-2599
,共7页
李节宾%徐友龙%熊礼龙%王景平
李節賓%徐友龍%熊禮龍%王景平
리절빈%서우룡%웅례룡%왕경평
锂离子电池%正极材料%LiNi1/3Co1/3Mn1/3O2%Mg掺杂%锂离子扩散系数
鋰離子電池%正極材料%LiNi1/3Co1/3Mn1/3O2%Mg摻雜%鋰離子擴散繫數
리리자전지%정겁재료%LiNi1/3Co1/3Mn1/3O2%Mg참잡%리리자확산계수
将氢氧化物共沉淀法制备的(Ni1/3Co1/3Mn1/3)(OH)2在500℃热处理5h得到具有尖晶石结构、纳米尺寸的氧化物M3O4(M=Ni1/3Co1/3Mn1/3).将其与LiOH及不同量的纳米MgO混合均匀,并在850℃热处理24 h制备了Li(Ni1/3Co1/3Mn1/3)1-xMgxO2(x=0,0.01,0.02,0.03,0.04,0.05)正极材料.随着Mg掺杂量的增大,正极材料的晶胞参数增大;少量的Mg掺杂增大了锂离子的扩散系数,而过度掺杂却使锂离子扩散系数有所降低,其中Li(Ni1/3CO1/3Mn1/3)098Mg002O2的锂离子扩散系数最大,其脱出和嵌入扩散系数分别为DLi-dem=29.20x 10-11 cm2·S-1和DLi-in=4.760×10-11 cm2·s-1;其以3C倍率充放电的平均放电比容量为139.3 mAh·g-1,比未掺杂的原粉约高9.5 mAh·g-1;另外其循环性能也得到了大幅度改善.
將氫氧化物共沉澱法製備的(Ni1/3Co1/3Mn1/3)(OH)2在500℃熱處理5h得到具有尖晶石結構、納米呎吋的氧化物M3O4(M=Ni1/3Co1/3Mn1/3).將其與LiOH及不同量的納米MgO混閤均勻,併在850℃熱處理24 h製備瞭Li(Ni1/3Co1/3Mn1/3)1-xMgxO2(x=0,0.01,0.02,0.03,0.04,0.05)正極材料.隨著Mg摻雜量的增大,正極材料的晶胞參數增大;少量的Mg摻雜增大瞭鋰離子的擴散繫數,而過度摻雜卻使鋰離子擴散繫數有所降低,其中Li(Ni1/3CO1/3Mn1/3)098Mg002O2的鋰離子擴散繫數最大,其脫齣和嵌入擴散繫數分彆為DLi-dem=29.20x 10-11 cm2·S-1和DLi-in=4.760×10-11 cm2·s-1;其以3C倍率充放電的平均放電比容量為139.3 mAh·g-1,比未摻雜的原粉約高9.5 mAh·g-1;另外其循環性能也得到瞭大幅度改善.
장경양화물공침정법제비적(Ni1/3Co1/3Mn1/3)(OH)2재500℃열처리5h득도구유첨정석결구、납미척촌적양화물M3O4(M=Ni1/3Co1/3Mn1/3).장기여LiOH급불동량적납미MgO혼합균균,병재850℃열처리24 h제비료Li(Ni1/3Co1/3Mn1/3)1-xMgxO2(x=0,0.01,0.02,0.03,0.04,0.05)정겁재료.수착Mg참잡량적증대,정겁재료적정포삼수증대;소량적Mg참잡증대료리리자적확산계수,이과도참잡각사리리자확산계수유소강저,기중Li(Ni1/3CO1/3Mn1/3)098Mg002O2적리리자확산계수최대,기탈출화감입확산계수분별위DLi-dem=29.20x 10-11 cm2·S-1화DLi-in=4.760×10-11 cm2·s-1;기이3C배솔충방전적평균방전비용량위139.3 mAh·g-1,비미참잡적원분약고9.5 mAh·g-1;령외기순배성능야득도료대폭도개선.
