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| Effect of Surfactant on Structure and Properties of LiNi0.80Co0.15Al0.05O2 |
| Author Name | Affiliation | E-mail | | HUANG Ling | Guangdong Research Institute of Rare Metals and Guangdong Provincial Key Laboratory of Rare Earth Development and Application, Guangdong 510650, China | hlsxg@163.com | | WANG Ying | Guangdong Research Institute of Rare Metals and Guangdong Provincial Key Laboratory of Rare Earth Development and Application, Guangdong 510650, China | | | TANG Ren-Heng | Guangdong Research Institute of Rare Metals and Guangdong Provincial Key Laboratory of Rare Earth Development and Application, Guangdong 510650, China | | | XIAO Fang-Ming | Guangdong Research Institute of Rare Metals and Guangdong Provincial Key Laboratory of Rare Earth Development and Application, Guangdong 510650, China | | | LI Wen-Chao | Guangdong Research Institute of Rare Metals and Guangdong Provincial Key Laboratory of Rare Earth Development and Application, Guangdong 510650, China | |
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| Abstract: A uniform LiNi0.80Co0.15Al0.05O2 microsphere materials (NCA) with tap density of 1.86~2.07 g·cm-3 were successfully prepared using co-precipitation method assisted by surfactants polyethylene glycol (PEG) or polyvinylpyrrolidone (PVP). Crystal structure, particles morphology and electrochemical features were evaluated through X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), cyclic voltammogram (CV), electrochemical impedance spectra (EIS) and charge/discharge studies. The results showed that the atomic ratio of Ni, Co and Al could not be affected in the materials which were synthesized with PEG or PVP and the materials had high tap density. The result of XRD showed that all the diffraction peaks of NCA materials were indexed to the pure α-NaFeO2 layered structure which belonged to R3m space group. SEM images of precursors and NCA materials were obvious that the growth of primary grains was improved with the addition of PVP and PEG. The NCA obtained with the addition of PEG and PVP displayed a high discharge capacity of 210.8 and 188.9 mAh·g-1 at 0.2C, and showed good capacity retention of 78.8% and 93.2% after 100 cycles respectively, which were better than that of NCA obtained without surfactant (173.0 mAh·g-1 and 82.7%). EIS curves showed that electrochemical impedance of NCA-2 electrode least than NCA-1 and NCA-3 after 100 cycles. SEM images of positive plates after 200 cycles were obvious that positive plates synthesized by using PVP had least cracks and particle fragmentation. NCA-2 showed better capacity retention than NCA obtained with the addition of PEG and NCA obtained without surfactant. |
| Keywords: battery cathode materials co-precipitation lithium nickel cobalt aluminum oxide (NCA) surfactant polyethylene glycol (PEG) polyvinylpyrrolidone (PVP) |
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| HUANG Ling,WANG Ying,TANG Ren-Heng,XIAO Fang-Ming,LI Wen-Chao.Effect of Surfactant on Structure and Properties of LiNi0.80Co0.15Al0.05O2[J].Chinese Journal of Inorganic Chemistry,2020,36(8):1465-1474. |
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