Original Article:
Anchored CoCO3 on peeled graphite sheets toward high-capacity lithium-ion battery anode
Guocui Xi, et al.
Journal of Materials Science, 2021, 10510–10522.
10.1007/s10853-021-05933-y
Cobalt carbonate is an inorganic compound, and its common applications include beneficiation agents, catalysts, pigments, feed, trace fertilizers, ceramics and raw materials for the production of cobalt oxide. Recently, transition metal carbonates (MnCO3, FeCO3, and CoCO3) have attracted widespread interest as potential anode materials due to their high theoretical capacity and low cost. However, poor internal conductivity and volume change hinder their applications.
In this work, the researchers report a method for simultaneously pulverizing CoCO3 and exfoliating graphite for obtaining various graphene composites with enhanced electrochemical properties. CoCO3 and graphite were mixed at a mass ratio of 85:15, ball milled at 500 rpm for 10 h under an Ar atmosphere, and the weight ratio of ball powder was 20:1 to obtain a composite material CoCO3/G.
Research Highlights
1. CoCO3 shows the best lithium storage activity compared with other carbonates. In order to overcome the defects such as poor electronic conductivity of bare CoCO3, a specific structural design was carried out in this work.
2. In the composite material, graphene forms a conductive network to facilitate electron transport within CoCO3, and its surface capacitive effect further enhances the rate capability.
3. Pulverization in the composite material shortens the ion diffusion path, and graphene enhances the diffusion coefficient, ensuring better electrochemical performance.
4. Compared with CoCO3, CoCO3/G not only has a higher capacity, but also exhibits better rate performance and long-term cycle performance.
Chemicals Related in the Paper:
| Catalog Number | Product Name | Structure | CAS Number | Price |
|---|---|---|---|---|
| ACM513791 | Cobalt carbonate |  |
513-79-1 | Price |
