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Influence of Cr-Substitution on the Electrochemical Performance of LiNi0.5Mn0.5O2 Cathode Material for Lithium Ion Batteries
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Influence of Cr-Substitution on the Electrochemical Performance of LiNi0.5Mn0.5O2 Cathode Material for Lithium Ion Batteries
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Natural Science Foundation of Guangxi, China (GKZ0832256); Innovation Project of Guangxi Graduate Education (2011105960805M16)

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    摘要:

    采用低溫燃燒法合成了鋰離子電池正極材料LiNi0.5Mn0.5-xCrxO2 (x=0, 0.01, 0.02, 0.05, 0.1)，研究了Cr取代部分Mn對其結(jié)構(gòu)和電化學(xué)性能的影響。充放電測試結(jié)果表明：Cr取代部分Mn對正極材料LiNi0.5Mn0.5-xCrxO2的電化學(xué)性能有重要的影響，用適量的Cr取代Mn（x=0.02）能夠提高正極材料的放電比容量和循環(huán)穩(wěn)定性。X射線衍射（XRD）分析和循環(huán)伏安（CV）測試顯示，Cr對Mn的適量取代能抑制正極材料中的陽離子混排，降低電極材料的極化，改善其可逆性能。LiNi0.5Mn0.48Cr0.02O2在2.5~4.6 V之間以0.1 C速率充放電，首次放電容量為179.9 mAh/g，第50次循環(huán)放電容量仍保有171.0 mAh/g，容量保持率達到95.1%。

    Abstract:

    The cathode material LiNi0.5Mn0.5-xCrxO2 (x=0, 0.01, 0.02, 0.05, 0.1) was synthesized via a low temperature combustion process. The influence of the partial substitution of Cr for Mn on its electrochemical performance was investigated. Charge/discharge test results show that the partial substitution of Cr for Mn has a significant influence on the electrochemical performance of LiNi0.5Mn0.5-xCrxO2, and the proper amount substitution of Cr for Mn (x=0.02) can increase its discharge capacity and improve its cyclic stability. The X-ray diffraction (XRD) and Cycle Voltammetry (CV) analyses indicate that the proper amount substitution of Cr for Mn can suppress the cation mixing in the cathode material, reduce the electrochemical polarization of the electrode material and improve its reversibility. The discharge capacity of LiNi0.5Mn0.48Cr0.02O2 at 0.1 C between 2.5 and 4.6 V is 179.9 and 171.0 mAh/g in the 1st and the 50th cycle, respectively, with a capacity retention of 95.1%.

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馬 真,葉乃清,吳保明,徐 東. Influence of Cr-Substitution on the Electrochemical Performance of LiNi0.5Mn0.5O2 Cathode Material for Lithium Ion Batteries[J].稀有金屬材料與工程,2014,43(8):1826~1829.[Ma Zhen, Ye Naiqing, Wu Baoming, Xu Dong. Influence of Cr-Substitution on the Electrochemical Performance of LiNi0.5Mn0.5O2 Cathode Material for Lithium Ion Batteries[J]. Rare Metal Materials and Engineering,2014,43(8):1826~1829.]
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  • 收稿日期:2013-08-23
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