Structural Evolution and Properties Analysis on a New Type NiTi-Si Anode Materials by Hot-Press Sintering
CHEN Dan1, ZUO Shun-gui1, JIN Ming-jiang1, CHEN Yi-xin1, XIAN Shu-jun1, YANG Chao-ming1, JIN Xue-jun2
1.Institute of Phase Transformation and Structure, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240,China 2.The State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240,China
Abstract：Si is considered as a quite promising anode electrode material for lithium ion batteries because of its high theoretical capacity. However, the large volume change of Si during the charge-discharge process may cause surface cracking and even pulverization of the electrode material. To solve this problem, NiTi alloys showing huge reversible strain were proposed to replace the conventional current collector, which may probably buffer the volume change of Si and thus improve the lifespan of the electrode. The NiTi-Si composite electrode material is synthesized by hot-pressing sintering process at different temperatures. The microstructure and the electrical properties as a function of the sintering temperature are investigated. Results showed that a dramatically decrease of electrical capacity occurred after 1st cycle due to the major part of Si was presented in inactivate ternary intermetallic compounds Ni4Ti4Si7. However, compared to the Si electrodes with traditional current collector, the NiTi-Si composite electrodes have larger cycle numbers, which may attributed to the buffering of the volume change by Ni4Ti4Si7.
收稿日期: 2014-06-26
出版日期: 2014-10-27
基金资助:超级沉淀型铁基形状记忆合金的马氏体相变热滞机制研究
通讯作者:
金明江
E-mail: jinmj@sjtu.edu.cn
引用本文:
陈丹，左舜贵，金明江，陈易新，冼淑君，杨超明，金学军. 热压烧结法制备新型NiTi-Si电极材料的结构演化和性能分析[J]. , 2014, 21(5): 1-5.
CHEN Dan, ZUO Shun-gui, JIN Ming-jiang, CHEN Yi-xin, XIAN Shu-jun, YANG Chao-ming, JIN Xue-jun. Structural Evolution and Properties Analysis on a New Type NiTi-Si Anode Materials by Hot-Press Sintering. , 2014, 21(5): 1-5.
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2014, Vol. 21 
