Nanoplate and mulberry-like porous shape of CuO as anode materials for secondary lithium ion battery

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• 作者：Subhalaxmi Mohapatra ; Shantikumar V. Nair ; Dhamodaran Santhanagopalan ; Alok Kumar Rai ; ^{alokkumarrai1@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; ^{alokkumar21223@aims.amrita.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：CuO ; Nanoplate ; Mulberry ; Porous ; Lithium ion batteries
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：10 July 2016
• 年：2016
• 卷：206
• 期：Complete
• 页码：217-225
• 全文大小：2174 K

文摘

Facile hydrothermal synthesis of nanoplate and mulberry-like porous shape of CuO nanostructures was developed as anode materials for application in lithium ion batteries. The powder X-ray diffraction patterns of both the samples were indexed well to a pure monoclinic phase of CuO with no impurities. The CuO sample synthesized at different pH and reaction temperature exhibited nanoplate with average width and length of ∼150–300 nm and ∼300–700 nm and mulberry-like porous shape of CuO with average length of ∼300–400 nm. Electrochemical tests show that the lithium storage performances of both the nanoplate and mulberry-like samples are influenced more closely to its structural aspects than their morphology and size factors. The CuO nanoplate electrode exhibits high reversible charge capacity of 279.3 mAh g⁻¹ at 1.0C after 70 cycles, and a capacity of 150.2 mAh g⁻¹ even at high current rate of 4.0C during rate test, whereas the mulberry-like porous shape of CuO anode delivers only 131.4 mAh g⁻¹ at 1.0C after 70 cycles and 121.7 mAh g⁻¹ at 4.0C. It is believed that the nanoplate type architecture is very favorable to accommodate the volume expansion/contraction and aggregation of particles during the cyclic process. In contrast, the mulberry-like porous morphology could not preserve the integrity of the structure and completely disintegrated into nanoparticles during Li⁺ ion insertion/deinsertion due to the loose contact between the particles.