Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 11, Pages 13061-13069Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c02697
Keywords
two-dimensional; Si-based; LIB anode; superior capacity; self-assembly
Funding
- Nanotechnol-ogy Platform Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT) , Japan [JPMXP09F-19-FA-0029]
- KAGENHI [19H02818]
- Iwatani Naoji Foundation
- National Natural Science Foundation of China [51772039, 51972293]
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This study introduces a creative synthesis strategy for composite Cu2MoS4/SiNS materials through the self-assembly of silicon nanospheres and a two-dimensional Cu2MoS4 material, showing significantly improved electrochemical performance in lithium-ion batteries.
Silicon-based anode materials have a theoretical capacity 10 times that of commercial graphite and have attracted attention. Herein, a creative and effective strategy is elaborated for the synthesis of composite Cu2MoS4/SiNS materials through the self-assembly of silicon nanospheres and a two-dimensional Cu2MoS4 material. The porous silicon dispersed in the two-dimensional layered structure can effectively release the volume expansion and mechanical stress generated, which can also provide further active sites and fast channels for Li+ transmission, and improve the conductivity of the material. As expected, when used as the anode of lithium-ion batteries, the Cu2MoS4/SiNS material exhibited a highly improved electrochemical performance. Benefitting from the unique structural features, the Cu2MoS4/SiNS material showed a discharge specific capacity of 1920 mAh g(-1) at 100 mA g(-1) and an excellent rate capability of 1330 mAh g(-1) at 1.0 A g(-1) after 100 cycles. When the current density was further increased to 2.0 A g(-1) to test the fast charging performance of the Cu2MoS4/SiNS material, we obtained a specific capacity of 1180 mAh g(-1) with 69.2% capacity retention that could still be maintained after 400 cycles. The ultrastable properties and superior capacity of the composite material provide the potential direction for the construction of high-performance lithium-ion batteries.
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