Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 15, Pages 12750-12758Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b02150
Keywords
LixSi alloy; high-capacity anode; LixSi-Li2O/TiyOz NPs; enhanced cycling stability; dry-air stability
Funding
- National Key R&D Program of China [2016YFA0201100]
- Thousand Talents Program for Young Researchers, National Natural Science Foundation of China [21601083]
- Natural Science Foundation of Jiangsu Province [BK20160614]
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Developing new electrode materials with high capacity and stability is an urgent demand in electric vehicle applications. LixSi alloy, as a promising high-capacity and Li-containing anode candidate, has attracted much attention. However, the alloy anode suffers severely from intrinsic high chemical reactivity and poor cycling stability in battery fabrication and operation. Here, we have developed a facile coating-then-lithiation approach to prepare lithiated-TiO2 protected LixSi nanoparticles (LixSi-Li2O/TiyOz NPs) as an attractive anode material. The robust lithiated-TiO2 protection matrix not only provides fast electron transport pathways to efficiently improve the electrical conductivity between LixSi/Si NPs, but also spatially limits the direct solid electrolyte interphase formation on LixSi/Si cores during cycling. More importantly, this dense coating layer protects most inner LixSi alloys from ambient corrosion, leading to high dry-air stability. As a result, the resulting LixSi-Li2O/TiyOz anode achieves greatly enhanced cycling and chemical stability in half-cells. It maintains capacity of about 1300 mAh g(-1) after prolonged 500 cycles at a high current rate of C/2, with 77% capacity retention. In addition, it exhibits excellent dry-air stability, with around 87% capacity retained after exposure to dry air (10% relative humidity) for 30 days.
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