Synthesis and Electrochemical Properties of LiMnPO4/C Materials
摘 要
采用湿法球磨与高温固相合成法相结合的工艺, 分别以油酸、葡萄糖、石墨、硬脂酸为碳源对LiMnPO4进行包覆合成了LiMnPO4/碳材料, 并研究了它的结构、形貌和电化学性能。结果表明: 碳包覆对LiMnPO4的橄榄石型结构无影响;采用有机碳源包覆的LiMnPO4/碳材料形貌呈更规则的类球形; 油酸包覆LiMnPO4/碳材料的电化学性能最好, 其在0.1C倍率下的首次充电比容量可达140.6 mAh·g-1, 首次放电比容量为123.4 mAh·g-1, 充放电效率为87.76%; 油酸包覆改善了材料的导电性和活性物质的可逆性能, 能够抑制Mn2+氧化和晶粒长大, 使粒径均匀。
Abstract
A series of LiMnPO4/C materials were synthesised by taking oleic acid, glucose, graphite and stearic acid as the carbon sources separately, which used a new process, solid state reaction and the wet milling method. The structure, morphology and electrochemical properties of the materials were studied. The results show that carbon coating had no effects on olivine-type structure of LiMnPO4, and the LiMnPO4 coated with organic carbon exhibited more regular class of spherical. Additionally the LiMnPO4 coated with oil acid had a better initial discharge capacity, that the charge capacity up to 140.6 mAh·g-1 and discharge capacity up to 123.4 mAh·g-1 at 0.1 C, and the charge/discharge efficiency was 87.76%. Oleic acid coating could improve the conductivity of the material and the reversible performance of the active substances, which could inhibit the oxidation of Mn2+and grains growth, made the grains size more uniform.
中图分类号 TM912.9 DOI 10.11973/jxgccl201509009
所属栏目 新材料 新工艺
基金项目 国家自然科学基金资助项目(31271868)
收稿日期 2015/1/8
修改稿日期 2015/5/3
网络出版日期
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备注曹永宁(1965-), 男, 宁夏银川人, 副教授, 工程硕士。
引用该论文: CAO Yong-ning,ZHANG Zheng-guo,GONG Bo-lin. Synthesis and Electrochemical Properties of LiMnPO4/C Materials[J]. Materials for mechancial engineering, 2015, 39(9): 41~44
曹永宁,张正国,龚波林. LiMnPO4/碳材料的合成及其电化学性能[J]. 机械工程材料, 2015, 39(9): 41~44
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【3】李兆萍,王一平,杨颖,等.固相反应烧结制备锂离子电池正极材料LiFeBO3及其电化学性能[J].机械工程材料,2014,38(6):16-19.
【4】PIECZONKA N P W, LIU Zhong-yi, HUQ A, et al. Comparative study of LiMnPO4/C cathodes synthesized by polyol and solid-state reaction methods for Li-ion batteries[J].Journal of Power Sources,2013, 230(10):122-129.
【5】OHA S M, OH S W,MYUNG S T, et al. The effects of calcination temperature on the electrochemical performance of LiMnPO4 prepared by ultrasonic spray pyrolysis[J]. Journal of Alloys and Compounds,2010,506 :372-376.
【6】BRAMNIK N N,EHRENBERG H.Precursor-based synthesis and electrochemical performance of LiMnPO4[J]. Journal of Alloys and Compounds,2008, 464:259-264.
【7】ZHONG S, XU Y, LI Y, et al. Synthesis and electrochemical performance of LiMnPO4/C composites cathode materials[J]. Rare Metals,2012,31(5):474-478.
【8】CAO Y, DUAN J, HU G, et al. Synthesis and electrochemical performance of nanostructured LiMnPO4/C composites as lithium-ion battery cathode by a precipitation technique[J]. Electrochimica Acta,2013,98:183-189.
【9】尚伟丽,黄永侃,陈玲震,等.共沉淀法合成正极材料LiMnPO4/C[J].电池,2013,43(4):227-228.
【10】杨新,刘学武,刘贵昌,等.锂离子电池正极材料LiMnPO4/C的合成研究[J].电化学,2011, 17(3):306-311.
【11】张正国.表面活性剂辅助制备锂离子电池三元正极材料[J].无机盐工业,2015,47(2):67-70.
【12】BAKENOV Z, TANIGUCHI I. Physical and electrochemical properties of LiMnPO4/C composite cathode prepared with different conductive carbons[J]. Journal of Power Sources,2010,195(21):7445-7451.
【13】刘学武,李新,邓远富,等.金属镁掺杂的LiMnPO4 /C的电化学性能研究[J].功能材料,2013,44(10):1381-1384.
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