| LiFePO4的软化学合成及锂快离子导体修饰 |
| Soft Chemistry Synthesis and Lithium Fast Ionic Conductor Modification for LiFePO4 Cathode Material of Li-Ion Battery |
| 作者 | 单位 | E-mail | | 闫时建 | 太原科技大学材料科学与工程学院, 先进材料研究所, 太原 030024 | | | 高亮 | 太原科技大学材料科学与工程学院, 先进材料研究所, 太原 030024 | | | 张敏刚 | 太原科技大学材料科学与工程学院, 先进材料研究所, 太原 030024 | am_lab@yeah.net | | 郑建军 | 太原科技大学材料科学与工程学院, 先进材料研究所, 太原 030024 | | | 刘建生 | 太原科技大学材料科学与工程学院, 先进材料研究所, 太原 030024 | |
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| 摘要: 采用溶剂热法制备正极材料LiFePO4，采用溶胶凝胶法制备Li0.5La0.5TiO3（LLTO）粉体，并通过酒精悬浮法对LiFePO4进行修饰，修饰量为LiFePO4质量的1%~4%，获得了薄壁蜂窝状自组装结构的LiFePO4上修饰有球状LLTO纳米颗粒的复合正极材料。通过进行充放电测试、交流阻抗测试及循环伏安测试，研究了不同修饰量对电池的充放电比容量、循环性能及可逆性的影响，发现当LLTO含量为3%（w/w）时，以2C和5C倍率放电相对于没有修饰LLTO的LiFePO4的比容量分别提高29.7%和31.6%，30次循环之后，容量损失率较未改性前减小4.13%，循环伏安曲线上氧化还原峰之间的电位差仅为0.117 V，以3%的LLTO修饰改性的LiFePO4显著提高了电池的倍率性能、循环性能和低温性能。 |
| 关键词: 锂离子电池 LiFePO4 Li0.5La0.5TiO3 修饰 |
| 基金项目: 山西省科技基础条件平台建设（No.2015091011）、山西省重点学科建设经费、晋城市科技计划（No.201501004-21）和太原市科技计划（No.110153）资助项目。 |
| Abstract: Soft chemistry synthesis and electrochemical properties via Li0.5La0.5TiO3 (LLTO) fast ionic conductor modification for LiFePO4 cathode material of Li-ion battery were investigated. LiFePO4 was synthesized via solvothermal method, LLTO powder was synthesized via sol-gel method, LiFePO4 was modified by LLTO with the proportion of 1%~4%(w/w) via alcohol suspension mixing method, and the composite cathode materials of thin-wall cellular characteristic self-assembly LiFePO4 modified by spherical LLTO nano-particles were acquired. The effects of LLTO modified proportion on charge and discharge specific capacity, cycle performance and reversibility were studied by charge/discharge test, AC impedance test and cyclic voltammetry test. The results indicate when LLTO modified proportion is 3% (w/w), the discharge specific capacity increases by 29.7% in the current rate of 2C and increases by 31.6% in the current rate of 5C, the capacity loss rate after 30 charge/discharge cycles decreases by 4.13% compared to unmodified condition, and the potential difference between redox peaks in cyclic voltammetry curve is only 0.117 V. LiFePO4 modified by LLTO with proportion of 3% significantly improves the current rate capability and cycle performance of Li-ion battery, and also improves the low temperature performance. |
| Keywords: Li-ion battery LiFePO4 Li0.5La0.5TiO3 modification |
| 投稿时间：2018-02-07 修订日期：2018-05-04 |
| 摘要点击次数: 1590 |
| 全文下载次数: 1100 |
| 闫时建,高亮,张敏刚,郑建军,刘建生.LiFePO4的软化学合成及锂快离子导体修饰[J].无机化学学报,2018,34(7):1319-1326. |
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