CAJ | 학술논문

采用机械活化一步固相法，在 Fe位掺杂Mg2＋合成了结晶度较好的 LiFe1－y Mgy PO4。采用XRD、SEM等方法对LiFe1－y Mgy PO4的结构和形貌进行了表征，利用恒电流充放电法研究了 Mg2＋掺杂对 LiFe1－y Mgy PO4电化学性能的影响。结果表明，适量Mg2＋掺杂不改变LiFePO4的晶体结构，同时可以细化颗粒粒径，增强导电性和可逆性，有效地提高LiFePO4的倍率性能和循环稳定性。LiFe09．9Mg00．1PO4在01． C和1 C倍率条件下首次放电比容量分别为1587．mAh／g和1419． m A h／g ，循环50次后放电比容量几乎没有衰减。
채용궤계활화일보고상법，재 Fe위참잡Mg2＋합성료결정도교호적 LiFe1－y Mgy PO4。채용XRD、SEM등방법대LiFe1－y Mgy PO4적결구화형모진행료표정，이용항전류충방전법연구료 Mg2＋참잡대 LiFe1－y Mgy PO4전화학성능적영향。결과표명，괄량Mg2＋참잡불개변LiFePO4적정체결구，동시가이세화과립립경，증강도전성화가역성，유효지제고LiFePO4적배솔성능화순배은정성。LiFe09．9Mg00．1PO4재01． C화1 C배솔조건하수차방전비용량분별위1587．mAh／g화1419． m A h／g ，순배50차후방전비용량궤호몰유쇠감。
Fe‐site doped LiFe1 - y Mgy PO4 was synthesized by mechanical activation‐one‐step solidification method .The structure ,morphology and electrochemical properties of the product were investigated by XRD ,SEM ,CV and galvanostatic charge/discharge determination .The effect of Mg2+ doping on electrochemical properties of the samples was discussed .The results show that the crystal structure of LiFePO4 was not changed after proper doping of Mg2+ .In the meantime ,the proper doping can refine the particle size ,and improve the electrical conductivity and reversibility of LiFePO4 .Accordingly ,the rate performance and the cycling stability of LiFePO4 can be improved effectively .The initial discharge capacity of LiFe0 9.9 Mg0 0.1 PO4 was 158 7. mAh/g at 0 1. C rate and 141 9. mAh/g at 1 0. C rate .And the capacity has almost no attenuation after 50 cycles .