期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 15, 页码 12922-12930出版社
AMER CHEMICAL SOC
DOI: 10.1021/am502867f
关键词
germanium; monolith; porous structure; anode; lithium ion batteries
资金
- National Natural Science Foundation of China [21271023, 91022006, 20973023]
- 111 Project [B07012]
Germanium (Ge) is a promising anode material for lithium ion batteries due to its high theoretical capacity. However, its poor cycling stability associated with its large volume changes during discharging and charging processes are urgent problems to solve. This provides opportunities to engineer materials to overcome these issues. Here, we demonstrated a facile and scalable method to synthesize Ge nanoparticles/N-doped carbon monolith with a hierarchically porous structure. The combination of a solvothermal method and annealing treatment results in a well-connected three-dimensional N-doped carbon network structure consisting of Ge nanoparticles firmly coated by the conducting carbon. Such a hierarchical architecture features multiple advantages, including a continuous conductive carbon network, binding the Ge nanoparticles with carbon through a Ge-N chemical bond, and a porous structure for alleviating volume expansion of Ge particles. When serving as an anode for lithium ion batteries, the as-formed hybrid displays high capacities up to 1240.3 mAh g(-1) at 0.1 A g(-1) and 813.4 mAh g(-1) at 0.5 A g(-1) after 90 cycles, and at the same time, it also exhibits good cycling stability and excellent rate capability.
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