本文以壳聚糖单体为碳源兼凝胶剂，利用溶胶-凝胶煅烧合成了锂离子电池LiFePO4/C正极材料，使用XRD和SEM对合成的材料进行表征. 用恒电流充放电测试了LiFePO4/C电极的电化学性能，当壳聚糖单体与LiFePO4摩尔比为1:1.2时，600 oC煅烧的LiFePO4/C电极性能最佳，其粒径分布均匀（200 ～ 400 nm），该电极0.2C倍率放电比容量为155 mAh.g-1，30周期循环放电比容量仍保持152 mAh.g-1，库仑效率为97.9 %.
徐嘉
,
王艳艳
,
王蕊
,
王博
,
潘越
,
曹殿学
,
王贵领
. 壳聚糖单体溶胶凝胶煅烧合成LiFePO4/C正极[J]. 电化学, 2013
, 19(2)
: 189
-192
.
DOI: 10.61558/2993-074X.2112
The LiFePO4/C cathode materials for Li-ion battery were synthesized by sol-gel and calcining method using chitosan monomer as a carbon source and a gelating agent. The structures and morphologies were characterized by X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM). The electrochemical performance was investigated by the galvanostatic charge–discharge test. When the molar ratios between chitosan monomer and LiFePO4 were 1:1.2, the LiFePO4/C cathode calcined at 600 oC showed the best performance. The particle sizes ranged 200 ～ 400 nm. The initial discharge capacity of 155 mAh.g-1 was achieved at room temperature with discharge rate of 0.2C, while the capacity of 152 mAh.g-1 could be maintained after 30 charge-discharge cycles. The coulombic efficiency was 97.9%.
[1] Sabina B, Libero D, Marina M. MW-assisted synthesis of LiFePO4 for high power applications[J]. Journal of Power Sources, 2008, 180(2): 875-879.
[2] Li J(李军), Lai G T(赖桂棠), Huang H M(黄慧民), et al. Preparation and properties of high capacity LiFePO4[J]. Journal of Electrochemistry(电化学), 2007, 13(4): 403-406.
[3] Fisher C A J, Islam M S. Surface structures and crystal morphologies of LiFePO4: Relevance to electrochemical behaviour[J]. Journal of Materials Chemistry, 2008, 18: 1209-1215.
[4] Park O K, Cho Y, Lee S, et al. Who will drive electric vehicles, olivine or spinel?[J]. Energy & Environmental Science, 2011, 4(5): 1621-1633.
[5] Daiwon C, Prashant N K. Surfactant based sol-gel approach to nanostructured LiFePO4 for high rate Li-ion batteries[J]. Journal of Power Sources, 2007, 163(2): 1064-1069.
[6] Kobayashi G, Nishimura S I, Park M S, et al. Isolation of solid solution phases in size-controlled LixFePO4 at room temperature[J]. Advanced Functional Materials, 2009, 19(3): 395-403.
[7] Keisuk S, Kaoru D, Kiyoshi K. Formation of impurities on phospho-olivine LiFePO4 during hydrothermal synthesis[J]. Journal of power Sources, 2008, 146(1/2): 555-558.
[8] Prosini P P , Lisi M , Zane D, et al. Determination of the chemical diffusion coefficient of lithium in LiFePO4[J]. Solid State Ionics, 2002, 148(1/2):45-51.
[9] Bai Y(白莹), Yang J M(杨觉明), Qing C B(卿春波), et al. Electrochemical performances of C-coating and co-doping LiFePO4[J]. Journal of Electrochemistry(电化学), 2011, 17(3): 334-338.
[10] Li T(李婷), Qian J F(钱江峰), Cao Y L(曹余良), et al. Electrochemical performance of Li1-xMxFePO4 cathode materials synthesized by polymer pyrolysis route[J]. Journal of Electrochemistry(电化学), 2007, 13(2): 136-139.
[11] Zou H L(邹红丽), Zhang G H(张光辉), Shen P K(沈培康). Hydrothermal reduction synthesis of LiFePO4 and its electrochemical performance[J]. Journal of Electrochemistry(电化学), 2010, 16(4): 416-419.
[12] Zhu C, Yu Y, Gu L, et al. Electrospinning of highly electroactive carbon-coated single- crystalline LiFePO4 nanowires[J]. Angewandte Chemie International Edition, 2011, 50(28): 6278-6282
[13] Yu L H(余丽红), Cao Y L(曹余良), Zhang X F(张晓飞), et al. Structure and electrochemical characteristics of LiFePO4 prepared by the polyacrylates pyrolysis reduction method for Li-ion batteries[J]. Journal of Electrochemistry(电化学), 2006, 12(4): 442-444.
[14] Wang L, Liang G C, Ou X Q, et al. Effect of synthesis temperature on the properties of LiFePO4/C composites prepared by carbothermal reduction[J]. Journal of Power Sources, 2009, 189(1): 423-428.
[15] Peng Y Y(彭友谊), Zhang H Y(张海燕), He C H(贺春华), et al. A study on the LiFePO4/ MWCNTs cathode materials for Li-ion batteries[J]. Journal of Electrochemistry(电化学), 2009, 15(3): 331-335.
[16] Lepage D, Michot C, Liang G, et al. A soft chemistry approach to coating of LiFePO4 with a conducting polymer[J]. Angewandte Chemie International Edition. 2011, 50(30): 6884-6887.
[17] Suh J, Matthew H. Application of chitosan-based polysaccharide biomaterials in cartilage tissue engineering: A review[J]. Biomaterials, 2000, 21(24):2589-2598.
[18] Kumar M. A review of chitin and chitosan applications[J]. Reactive and functional polymers, 2000, 46(1): 1-27.
[19] 王贵领，曹殿学，王博. 壳聚糖改性锂离子电池LiFePO4正极材料[P]. CN200910071245.2.
