Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6607244 | Electrochimica Acta | 2016 | 10 Pages |
Abstract
This study explores an efficient infrared (IR) heating technique to synthesize highly-crystalline LiNi0.8Co0.15Al0.05O2 (NCA) cathode materials for Li-ion batteries. One home-made IR induction reactor, equipped with medium-wave IR emitter array, is adopted to prepare the NCA powders at 700 °C for a calcination period of 1-5 h. Two kinds of preparation routes, ball milling and rheological-phase method, are used to prepare NCA precursors. The as-prepared NCA powders display well ordering of hexagonal two-dimensional layer structure with low degree of cation mixing under appropriate conditions: IR heating time (5 h) and rheological-phase method. The NCA cathode exhibits an improved discharge capacity, fast Li+ diffusion rate, high rate capability, and good cycling stability. This improved performance mainly originates from low cation mixing, low defect level, and homogeneous particle size of NCA crystals. The carbon-coated NCA cathode offers high capacities of ca. 213 and 115 mAh gâ1 at 0.1 and 5C, respectively. Analyzed by the Randles-Sevcik plots, the diffusion coefficients in the NCA cathodes increase up to 1.73 Ã 10â8 and 5.82 Ã 10â9 cm2 sâ1 for Li-extraction and Li-insertion, respectively. Accordingly, the IR heating route turns on a commercial feasibility to synthesize NCA cathode materials for Li-ion battery application.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Chien-Te Hsieh, Hsiu-Hui Hsu, Jo-Pei Hsu, Yu-Fu Chen, Jeng-Kuei Chang,