Abstract
Advances in secondary batteries are required for realization of many technologies. In particular, there remains a need for stable higher energy batteries. Here we suggest a new anode concept consisting of an ultrathin Co3O4 nanosheet-coated Ni inverse opal which provides high charge-discharge rate performance using a material system with potential for high energy densities. Via a hydrothermal process, about 4 nm thick Co3O4 nanosheets were grown throughout a three-dimensional Ni scaffold. This architecture provides efficient pathways for both lithium and electron transfer, enabling high charge-discharge rate performance. The scaffold also accommodates volume changes during cycling, which serves to reduce capacity fade. Because the scaffold has a low electrical resistance, and is three-dimensionally porous, it enables most of the electrochemically active nanomaterials to take part in lithiation-delithiation reactions, resulting in a near-theoretical capacity. On a Co3O4 basis, the Ni@Co3O4 electrode possesses a capacity of about 726 mAh g-1 at a current density of 500 mA g-1 after 50 cycles, which is about twice the theoretical capacity of graphite. The capacity is 487 mAh g-1, even at a current density of 1786 mA g-1.
Original language | English (US) |
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Article number | 21626 |
Pages (from-to) | 40-48 |
Number of pages | 9 |
Journal | Journal of Power Sources |
Volume | 299 |
DOIs | |
State | Published - Dec 20 2015 |
Keywords
- Anode
- High power
- Mesostructured electrode
- Nanostructure
- Secondary battery
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering