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| 1 | A novel synthesis strategy to improve cycle stability of LiNio.8Mno.1Co0.1O2 at high cut-off voltages through core-shell structuring显示文摘Nickel-rich cathode materials have attracted considerable interest because of their high specific capacities,voltage ranges,and low cost.However,serious capacity attenuation and poor rate performance limit their application.This study proposes a novel strategy to improve the cycle stability of the nickel-rich LiNi0.sCo0.1Mn0.1O2(NCM811)layer material by designing core-shell LiNio.sCoo.1 Mno.102(CS-NCM811).CS-NCM811 is designed by the characteristic reaction between dimethylglyoxime(C4H8N2O2)and nickel ion to form Ni(C4H7N2O2)2-The CS-NCM811 is characterized with high nickel content in its core and high manganese content on its surface,leading to a high capacity and excellent cycle stability.The capacity retention of CS-NCM811 was 72.8%,much higher than that of NCM811(47.1%)after 500 cycles at a rate of 5 C.Not only is this method a no vel strategy to desig n high capacity cathode materials but also provides some new in sights into the cycle stability of nickel-rich layered cathode materials. | Kang Wu Qi Li Rongbin Dang Xin Deng Minmin Chen Yu Lin Lee Xiaoling Xiao Zhongbo Hu | 2019 | Nano Research2019，12，10： | 12 |
| 2 | 微波辅助回流法制备桑椹形Na_3V_2(PO_4)_2O_2F@C正极材料用于高性能钠/锂离子电池(英文)显示文摘本论文采用快速微波辅助低温回流策略制备了桑椹形Na_3V_2(PO_4)_2O_2F@C纳米复合材料.研究表明微乳液中的V(acac)_3反胶束体系对该自组装结构的形成起到了关键作用.制得的Na_3V_2(PO_4)_2O_2F晶粒沿着[002]方向生长并被原位包封在碳壳中,形成了高度稳定的自组装结构,这不仅有利于Na^+/e^-的快速迁移,而且能够有效改善电极材料的循环性能并抑制电压衰减.作为钠离子电池正极材料,在0.1 C条件下, Na_3V_2(PO_4)_2O_2F@C的初始放电容量约为127.9 mA h g^(-1).在高倍率(20 C)条件下,容量达88.1 mA h g^(-1), 2000次循环后容量保持率为82.1%.此外,利用非原位X射线衍射, X射线光电子能谱和恒电流间歇滴定技术,初步研究了Na_3V_2(PO4)_2O_2F@C在充放电过程中的反应机理和Na^+迁移机制.同时,在Li/Na离子混合电池当中, Na_3V_2(PO_4)_2O_2F@C也表现出了优异的倍率和循环性能.上述微波辅助低温回流合成策略为开发高性能电化学储能材料开辟了新的途径. | 侯燕 常焜 王振宇 顾帅 刘琼 张钧君 程化 张圣麟 常照荣 卢周广 | 2019 | Science China Materials2019，62，4： | 4 |
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