Self-assembled GeOX/Ti3C2TX Composites as Promising Anode Materials for Lithium Ion Batteries.
Self-assembled GeOX/Ti3C2TX Composites as Promising Anode Materials for Lithium Ion Batteries.
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DOI：
10.1021/acs.inorgchem.9b03784
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发表时间：
2020-03
影响因子：
4.6
通讯作者：
Sheng-chao Song;Ding-chuan Zuo;Chang-sheng An;Xia-hui Zhang;Jin-hui Li;Zhen He;Yun-jiao Li;
中科院分区：
文献类型：
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作者：
Sheng-chao Song;Ding-chuan Zuo;Chang-sheng An;Xia-hui Zhang;Jin-hui Li;Zhen He;Yun-jiao Li;
高容量锗基负极材料是高性能锂离子电池的替代材料，但充放电过程中严重的体积变化和粉化问题会严重影响其电化学性能。为了解决这一挑战，使用一种简单的策略来制备自组装GeOX/Ti 3C 2 TX复合材料，其中GeOX纳米颗粒可以直接在Ti 3C 2 TX层上生长。纳米GeOX在Ti 3C 2 TX的表面和层间均匀地重新成核，形成稳定的多相结构，保证了其优异的电化学性能。电化学评价表明，GeOx/Ti 3 C2 TX的倍率性能和可逆性均得到大幅提高，可逆放电比容量超过1400 mAh g-1（100 mA g-1），50次循环后可逆比容量为900 mAh g-1，同时在5000 mA g-1下仍保持稳定的725 mAh g-1的比容量。此外，该复合材料表现出异常优异的上级倍率性能，使其成为LIB的良好电化学性能阳极。
High-capacity germanium-based anode materials are alternative materials for outstanding electrochemical performance lithium-ion batteries (LIBs), but severe volume variation and pulverization problems during charging-discharging processes can seriously affect their electrochemical performance. In addressing this challenge, a simple strategy was used to prepare the self-assembled GeOX/Ti3C2TX composite in which the GeOX nanoparticles can grow directly on Ti3C2TX layers. Nanoscale GeOX uniformly renucleates on the surface and interlayers of Ti3C2TX, forming the stable multiphase structure, which guarantees its excellent electrochemical performance. Electrochemical evaluation has shown that the rate capability and reversibility of GeOX/Ti3C2TX are both greatly improved, which delivers a reversible discharge specific capacity of above 1400 mAh g-1 (at 100 mA g-1) and a reversible specific capacity of 900 mAh g-1 after 50 cycles while it still maintains a stable specific capacity of 725 mAh g-1 at 5000 mA g-1. Furthermore, the composite exhibits an exceptionally superior rate capability, making it a good electrochemical performance anode for LIBs.