Guo Haipeng, Ruan Boyang, Liu Lili, Zhang Lei, Tao Zhanliang, Chou Shulei, Wang Jiazhao, Liu Huakun
Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, North Wollongong, NSW, 2500, Australia.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, China.
Small. 2017 Jul;13(28). doi: 10.1002/smll.201700920. Epub 2017 May 30.
Germanium (Ge) is a prospective anode material for lithium-ion batteries, as it possesses large theoretical capacity, outstanding lithium-ion diffusivity, and excellent electrical conductivity. Ge suffers from drastic capacity decay and poor rate performance, however, owing to its low electrical conductivity and huge volume expansion during cycling processes. Herein, a novel strategy has been developed to synthesize a Ge@N-doped carbon nanotubes (Ge@N-CNTs) composite with Ge nanoparticles uniformly distributed in the N-CNTs by using capillary action. This unique structure could effectively buffer large volume expansion. When evaluated as an anode material, the Ge@N-CNTs demonstrate enhanced cycling stability and excellent rate capabilities.
锗（Ge）是一种有前景的锂离子电池负极材料，因为它具有高理论容量、出色的锂离子扩散率和优异的导电性。然而，由于其低电导率以及在循环过程中巨大的体积膨胀，锗会出现严重的容量衰减和较差的倍率性能。在此，通过利用毛细作用，开发了一种新颖的策略来合成一种Ge@N掺杂碳纳米管（Ge@N-CNTs）复合材料，其中Ge纳米颗粒均匀分布在N-CNTs中。这种独特的结构可以有效缓冲大体积膨胀。当作为负极材料进行评估时，Ge@N-CNTs表现出增强的循环稳定性和优异的倍率性能。
