納米多孔NiO類空心微球負極材料的制備與儲鋰性能
發(fā)布時間:2018-10-08 18:51
【摘要】:以NiCl_2·6H_2O、尿素、葡萄糖為原料采用水熱法制備了NiO前體,將前體在空氣中燒結(jié)最終得到NiO電極活性材料。該NiO樣品具有鏤空結(jié)構(gòu)的類空心球形貌,且由50~100 nm初級納米顆粒構(gòu)成。對該NiO樣品作為鋰離子電池負極材料的儲鋰性能進行了研究,結(jié)果發(fā)現(xiàn)贗電容效應(yīng)對該材料儲鋰容量和倍率性能有重要貢獻。因獨特的空心納米結(jié)構(gòu)和贗電容效應(yīng),該材料表現(xiàn)出出色的電化學(xué)循環(huán)穩(wěn)定性和優(yōu)異的大倍率充放電性能。在500m A·g~(-1)電流密度下,100圈充放電循環(huán)后放電比容量為650 m A·h·g~(-1),容量保持率達86.6%;在10 A·g~(-1)的超高倍率下,其穩(wěn)定放電比容量仍高達432 m A·h·g~(-1)。
[Abstract]:The precursor of NiO was prepared by hydrothermal method using NiCl_2 6H _ 2O, urea and glucose as raw materials. The precursor was sintered in air to obtain the active material of NiO electrode. The NiO samples have hollow like spheres with hollow structure and are made up of 50 ~ (100) nm primary nanocrystalline particles. The lithium storage performance of the NiO sample as a cathode material for lithium ion battery was studied. It was found that the pseudo-capacitance effect had an important contribution to the lithium storage capacity and the ratio performance of the material. Due to its unique hollow nanostructure and pseudo-capacitance effect, the material exhibits excellent electrochemical cycling stability and excellent charge-discharge performance at large rate. At the current density of 500 Ma g ~ (-1), the specific discharge capacity is 650 m A h g ~ (-1) after charge and discharge cycle, and the capacity retention is up to 86.6%, and the steady discharge specific capacity is still up to 432 m A h g ~ (-1) at 10 A g ~ (-1).
【作者單位】: 廣西電磁化學(xué)功能物質(zhì)重點實驗室桂林理工大學(xué)化學(xué)與生物工程學(xué)院;桂林理工大學(xué)廣西有色金屬隱伏礦床勘查及材料開發(fā)協(xié)同創(chuàng)新中心;
【基金】:國家自然科學(xué)基金項目(21263003,51664012,51464009) 廣西自然科學(xué)基金項目(2015GXNSFGA139006,2014GXNSFBA118238) 廣西研究生教育創(chuàng)新計劃項目(YCSW2017158)~~
【分類號】:TM912
本文編號:2257885
[Abstract]:The precursor of NiO was prepared by hydrothermal method using NiCl_2 6H _ 2O, urea and glucose as raw materials. The precursor was sintered in air to obtain the active material of NiO electrode. The NiO samples have hollow like spheres with hollow structure and are made up of 50 ~ (100) nm primary nanocrystalline particles. The lithium storage performance of the NiO sample as a cathode material for lithium ion battery was studied. It was found that the pseudo-capacitance effect had an important contribution to the lithium storage capacity and the ratio performance of the material. Due to its unique hollow nanostructure and pseudo-capacitance effect, the material exhibits excellent electrochemical cycling stability and excellent charge-discharge performance at large rate. At the current density of 500 Ma g ~ (-1), the specific discharge capacity is 650 m A h g ~ (-1) after charge and discharge cycle, and the capacity retention is up to 86.6%, and the steady discharge specific capacity is still up to 432 m A h g ~ (-1) at 10 A g ~ (-1).
【作者單位】: 廣西電磁化學(xué)功能物質(zhì)重點實驗室桂林理工大學(xué)化學(xué)與生物工程學(xué)院;桂林理工大學(xué)廣西有色金屬隱伏礦床勘查及材料開發(fā)協(xié)同創(chuàng)新中心;
【基金】:國家自然科學(xué)基金項目(21263003,51664012,51464009) 廣西自然科學(xué)基金項目(2015GXNSFGA139006,2014GXNSFBA118238) 廣西研究生教育創(chuàng)新計劃項目(YCSW2017158)~~
【分類號】:TM912
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