Journal
ADVANCED MATERIALS
Volume 34, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202200672
Keywords
bonding networks; Li-ion batteries; micrometer-sized SiO; (x); structural integrity
Categories
Funding
- National Key R&D Program of China [2019YFA0705602, 2021YFB2400200]
- Innovation team for R&D and industrialization of High Energy Density Si-based Power batteries [2018607219003]
- Basic Science Center Project of National Natural Science Foundation of China [51788104]
- Chinese Academy of Sciences [XDA21070300]
- National Science Foundation of China [52002374]
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This work addresses the challenge of volume variation in micrometer-sized Si-based anode materials during electrochemical processes by preparing in situ magnesium-doped SiOx microparticles. The resulting anode exhibits high reversible capacities, stable cycling performance, and low electrode expansion. A cylindrical-type cell based on this anode demonstrates a 1000-cycle operation life, meeting practical storage requirements for consumer electronics and electric vehicles.
In recent years, micrometer-sized Si-based anode materials have attracted intensive attention in the pursuit of energy-storage systems with high energy and low cost. However, the significant volume variation during repeated electrochemical (de)alloying processes will seriously damage the bulk structure of SiOx microparticles, resulting in rapid performance fade. This work proposes to address the challenge by preparing in situ magnesium-doped SiOx (SiMgyOx) microparticles with stable structural evolution against Li uptake/release. The homogeneous distribution of magnesium silicate in SiMgyOx contributes to building a bonding network inside the particle so that it raises the modulus of lithiated state and restrains the internal cracks due to electrochemical agglomeration of nano-Si. The prepared micrometer-sized SiMgyOx anode shows high reversible capacities, stable cycling performance, and low electrode expansion at high areal mass loading. A 21700 cylindrical-type cell based on the SiMgyOx-graphite anode and LiNi0.8Co0.15Al0.05O2 cathode demonstrates a 1000-cycle operation life using industry-recognized electrochemical test procedures, which meets the practical storage requirements for consumer electronics and electric vehicles. This work provides insights on the reasonable structural design of micrometer-sized alloying anode materials toward realization of high-performance Li-ion batteries.
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