掺杂对LiFePO<sub>4</sub>电化学性能的影响

材料研究学报

2009, Vol. 23

Issue (6): 646-651

研究论文

本期目录 | 过刊浏览

掺杂对LiFePO₄电化学性能的影响

康晓雪¹; 田彦文 ¹; 邵忠宝²; 袁万颂¹

1.东北大学材料与冶金学院沈阳 110004
2.东北大学理学院沈阳 110004

The effect on electrochemical performance of LiFePO4 by different doping

KANG Xiaoxue¹; TIAN Yanwen¹; SHAO Zhongbao²; YUAN Wansong¹

1.School of Materials and Metallurgy; Northeastern University; Shenyang 110004
2.School of Science; Northeastern University; Shenyang 110004

引用本文:

康晓雪田彦文邵忠宝袁万颂. 掺杂对LiFePO₄电化学性能的影响[J]. 材料研究学报, 2009, 23(6): 646-651.
. The effect on electrochemical performance of LiFePO4 by different doping[J]. Chin J Mater Res, 2009, 23(6): 646-651.

全文: PDF(1200 KB)

摘要:

用水热法制备LiFe₀.₉₅M_0.05PO₄(M = Mg, Ni, Co), 研究了掺杂对材料电化学性能的影响. 结果表明, 液相Fe位掺杂合成的LiFe _0.95 M ₀.₀₅PO₄具有纯相橄榄石结构、结晶良好、粒径均匀; Fe位掺杂可增强材料的可逆性和导电性, 提高其1C倍率下的电化学容量和循环稳定性; LiFe_0.95Mg _0.05PO₄, LiFe _0.95 Ni _0.05 PO₄ 和LiFe _0.95 Co _0.05 PO ₄三种材料的1C倍率首次放电比容量分别为133.1 mAh ?g^-1, 128.4 mAh ?g ^-1 和135.2 mAh ? g ^-1; 三种掺杂离子中Co ²⁺掺杂的效果最好, 0.1C和1C倍率放电循环30次后的容量衰减率仅为5.7%和9.5%.

关键词 ：无机非金属材料 , LiFePO₄ , , Fe位掺杂 , 水热合成 , 液相掺杂

Abstract：

LiFe _0.95 M_0.05 PO ₄ (M=Mg, Ni, Co) were synthesized by hydrothermal process with Fe-site doping in liquid phase. The samples of LiFe_0.95 M_0.05 PO ₄ were characterized by XRD, FTIR and SEM methods. The effect of Fe-site doping on electrochemical properties of the samples was investigated. The results show that the electrochemical capacity and cyclic stability of LiFe_0.95 M _0.05 PO ₄ at 1C are enhanced. Under 1C rate, the first discharge capacity of LiFe_0.95 Mg_0.05 PO ₄, LiFe _0.95 Ni_0.05 PO 4 and LiFe_0.95 Co_0.05 PO ₄ exhibit 133.1 mAh·g⁻¹, 128.4 mAh·g⁻¹ and 135.2 mAh·g⁻¹, respectively. In three doping ions, the result of Co ²⁺ doping is the best. The capacity fading rates of LiFe _0.95 Co _0.05 PO ₄ are 5.7% at 0.1C and 9.5% at 1C after 30 cycles. Such a significant improvement of electrochemical performance at 1C rate should be related to the enhancement of the reversibility and conductivity of LiFePO₄doped by bivalent cation
in Fe-site.

Key words： inorganic non-metallic materials LiFePO4 Fe-site doping hydrothermal synthesis doping in liquid phase

收稿日期: 2009-05-31

ZTFLH:

TM912

基金资助:

辽宁省科技攻关2005224016资助项目.

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