流变相法制备海藻酸基碳包覆Li3V2(PO4)3材料的电化学性能

引用本文: 李万隆, 李月姣, 曹美玲, 曲薇, 屈雯洁, 陈实, 陈人杰, 吴锋. 流变相法制备海藻酸基碳包覆Li₃V₂(PO₄)₃材料的电化学性能[J]. 物理化学学报, 2017, 33(11): 2261-2267. doi: 10.3866/PKU.WHXB201705293 shu

Citation: LI Wan-Long, LI Yue-Jiao, CAO Mei-Ling, QU Wei, QU Wen-Jie, CHEN Shi, CHEN Ren-Jie, WU Feng. Synthesis and Electrochemical Performance of Alginic Acid-Based Carbon-Coated Li₃V₂(PO₄)₃ Composite by Rheological Phase Method[J]. Acta Physico-Chimica Sinica, 2017, 33(11): 2261-2267. doi: 10.3866/PKU.WHXB201705293 shu

流变相法制备海藻酸基碳包覆Li₃V₂(PO₄)₃材料的电化学性能

李万隆 ^1, ,
李月姣 ^1, ,
曹美玲 ^1, ,
曲薇 ^1, ,
屈雯洁 ^1, ,
陈实 ^1,2, ,
陈人杰 ^1,2, ,
吴锋 ^1,2,

1.
北京理工大学材料学院, 环境科学与工程北京市重点实验室, 北京 100081;
2.
北京电动车辆协同创新中心, 北京 100081
基金项目:
国家重点研发计划项目（2016YFB0100204），国家自然科学基金项目（21373028），国家自然科学联合基金项目（U1564206）和中央在京高校重大成果转化项目（D151100003015001）资助

摘要: 以海藻酸为碳源，采用流变相法制备出碳包覆改性的Li₃V₂（PO₄）₃/C （LVP/C）正极材料。X射线衍射（XRD）结果显示所合成样品均为标准的单斜结构Li₃V₂（PO₄）₃。扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像显示所合成的LVP/C活性材料颗粒尺寸较均匀。海藻酸质量分数为10%的LVP/C样品展现出最优的循环稳定性。0.1C放电电流下，首次放电容量为117.5 mAh·g^-1，50周循环后容量保持在116.5 mAh·g^-1。LVP/C-10%材料在3.0-4.3 V和3.0-4.8 V电压范围内循环50周后的容量保持率分别为99.1%和76.8%，明显优于未包覆的LVP材料。海藻酸基碳包覆层可以有效增加材料的电子导电性、缓冲活性材料在脱嵌锂过程产生的机械损伤，进而提高材料的电化学性能。

关键词:

English

Synthesis and Electrochemical Performance of Alginic Acid-Based Carbon-Coated Li₃V₂(PO₄)₃ Composite by Rheological Phase Method

1.
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China;
2.
Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, P. R. China
Received Date: 27 March 2017
Revised Date: 23 May 2017
Fund Project:
The project was supported by the National Key Research and Development Program of China (2016YFB0100204), National Natural Science Foundation of China (21373028), Joint Funds of the National Natural Science Foundation of China (U1564206), and Major achievements Transformation Project for Central University in Beijing, Beijing Science and Technology Project (D151100003015001).

Abstract: Li₃V₂(PO₄)₃/C (LVP/C) cathode materials were successfully prepared by a rheological phase method using alginic acid as the carbon source. The X-ray diffraction (XRD) patterns demonstrate that all the samples contain pure LVP with the same monoclinic structure. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show that LVP/C materials have a uniform particle size. The LVP/C sample with 10% (w) alginic acid shows the best cycling stability. It delivers a discharge capacity of 117.5 mAh·g^-1 (3.0-4.3 V), which can be maintained at 116.5 mAh·g^-1 after 50 cycles at a rate of 0.1C. Its capacity retentions of 99.1% (3.0-4.3 V) and 76.8% (3.0-4.8 V) after 50 cycles are prominently higher than those of pristine Li₃V₂(PO₄)₃, which are 89.7% (3.0-4.3 V) and 62.39% (3.0-4.8 V). These outstanding electrochemical performances are mainly attributed to the alginic acid-based carbon coating, which can increase the electronic conductivity of materials and buffer the mechanical damage of the active materials during the Li ion insertion/extraction process, thus improving the electrochemical performance of the LVP/C samples.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

流变相法制备海藻酸基碳包覆Li₃V₂(PO₄)₃材料的电化学性能

English

Synthesis and Electrochemical Performance of Alginic Acid-Based Carbon-Coated Li₃V₂(PO₄)₃ Composite by Rheological Phase Method

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