无机化学学报
無機化學學報
무궤화학학보
JOURNAL OF INORGANIC CHEMISTRY
2010年
7期
1235-1239
,共5页
杜柯%刘艳%胡国荣%彭忠东%曹雁冰%蒋庆来
杜柯%劉豔%鬍國榮%彭忠東%曹雁冰%蔣慶來
두가%류염%호국영%팽충동%조안빙%장경래
LiFePO4%碳包覆%掺杂%固相反应
LiFePO4%碳包覆%摻雜%固相反應
LiFePO4%탄포복%참잡%고상반응
采用两步固相反应合成了锂、铁双位掺杂的锂离子电池正极材料Li0.99Nb0.01Fe-xMgxPO4/C(x=0,0.01,0.02,0.03,0.04).通过X射线衍射(XRD)、扫描电镜(SEM)以及恒电流充放电测试,研究了复合材料的晶体结构、形貌以及电化学性能.实验结果表明,制备的Li0.99Nb0.01Fe1-xMgPO4/C(x=0,0.01,0.02,0.03,0.04)为纯相,掺杂适量的Nb5+、Mg2+离子可减小材料的晶粒尺寸,当Nb离子掺杂量为lm01%、Mg离子掺杂量为3m01%时,Li0.99Nb0.01Fe0.97Mg0.03PO4/C的电化学性能最佳.室温下,0.2C、1C、2C、4C(1C=170mA·g-1)倍率充放电其首次放电比容量分别为153.7、149.7、144.6、126.4 mAh·g-1,即使在8C倍率下放电其放电比容量也有92.2mAh·g-1,并表现出良好的循环性能.
採用兩步固相反應閤成瞭鋰、鐵雙位摻雜的鋰離子電池正極材料Li0.99Nb0.01Fe-xMgxPO4/C(x=0,0.01,0.02,0.03,0.04).通過X射線衍射(XRD)、掃描電鏡(SEM)以及恆電流充放電測試,研究瞭複閤材料的晶體結構、形貌以及電化學性能.實驗結果錶明,製備的Li0.99Nb0.01Fe1-xMgPO4/C(x=0,0.01,0.02,0.03,0.04)為純相,摻雜適量的Nb5+、Mg2+離子可減小材料的晶粒呎吋,噹Nb離子摻雜量為lm01%、Mg離子摻雜量為3m01%時,Li0.99Nb0.01Fe0.97Mg0.03PO4/C的電化學性能最佳.室溫下,0.2C、1C、2C、4C(1C=170mA·g-1)倍率充放電其首次放電比容量分彆為153.7、149.7、144.6、126.4 mAh·g-1,即使在8C倍率下放電其放電比容量也有92.2mAh·g-1,併錶現齣良好的循環性能.
채용량보고상반응합성료리、철쌍위참잡적리리자전지정겁재료Li0.99Nb0.01Fe-xMgxPO4/C(x=0,0.01,0.02,0.03,0.04).통과X사선연사(XRD)、소묘전경(SEM)이급항전류충방전측시,연구료복합재료적정체결구、형모이급전화학성능.실험결과표명,제비적Li0.99Nb0.01Fe1-xMgPO4/C(x=0,0.01,0.02,0.03,0.04)위순상,참잡괄량적Nb5+、Mg2+리자가감소재료적정립척촌,당Nb리자참잡량위lm01%、Mg리자참잡량위3m01%시,Li0.99Nb0.01Fe0.97Mg0.03PO4/C적전화학성능최가.실온하,0.2C、1C、2C、4C(1C=170mA·g-1)배솔충방전기수차방전비용량분별위153.7、149.7、144.6、126.4 mAh·g-1,즉사재8C배솔하방전기방전비용량야유92.2mAh·g-1,병표현출량호적순배성능.
