摘要
以廉价无机盐为原料、柠檬酸为碳源,采用水基溶胶-凝胶法合成了LiMnPO_4/C正极材料。使用X射线衍射(XRD)、扫描电子显微镜(SEM)对晶体结构和微观形貌进行了表征。结果表明得到了纯相的LiMnPO_4/C正极材料。在二段式烧结、烧结温度为650℃时得到的正极材料具有较好的电化学性能,其在室温0.05 C倍率下,首次放电容量为142.8(m A·h)/g,20次循环后放电容量为112.4(m A·h)/g。
LiMnPO4/C composite as a cathode material for lithium ion batteries was synthesized via a Solgel method using cheap inorganic salt while citric acid as a carbon source. Crystalline structure and morphology of the composite were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）. The results indicate that the LiMnPO4/C composite is well crystallized as an olivine structure without any detectable impurity phase. Electrochemical performance of the material prepared was better when the annealing temperature was set to 650 ℃ by two-stage sintering, its first discharge capacities was 142. 8（mA · h）/g at rates of 0. 05 C under room temperature, and it remained 112. 4（mA · h）/g after 20 cycles.
出处
《有色金属工程》
CSCD
北大核心
2017年第5期35-39,共5页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(51374056)
甘肃省"陇原青年创新人才扶持计划"
河北省自然科学基金-钢铁联合研究基金(E2014501143)
