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氧化铝包覆量对锰酸锂正极材料电化学性能的影响 被引量:5
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作者 刘国壮 赖飞燕 +3 位作者 杨辉 黄有国 王红强 李庆余 《材料科学》 2017年第7期648-654,共7页
针对锰酸锂正极材料存在循环性能差的问题,以九水硝酸铝(Al(NO3)3·9H2O)和尖晶石锰酸锂(LiMn2O4)为原料,采用溶胶–凝胶法制备氧化铝包覆锰酸锂正极材料,研究氧化铝包覆量(氧化铝与锰酸锂的质量比)对锰酸锂正极材料的结构及其电化... 针对锰酸锂正极材料存在循环性能差的问题,以九水硝酸铝(Al(NO3)3·9H2O)和尖晶石锰酸锂(LiMn2O4)为原料,采用溶胶–凝胶法制备氧化铝包覆锰酸锂正极材料,研究氧化铝包覆量(氧化铝与锰酸锂的质量比)对锰酸锂正极材料的结构及其电化学性能的影响。采用XRD和SEM等手段研究合成材料的晶体结构和微观形貌;通过循环充放电测试和循环伏安法等方法研究其电化学性能。XRD和SEM结果表明:氧化铝的包覆并没有改变锰酸锂的晶体结构,只是包覆在锰酸锂的表面。电化学性能测试结果表明,当氧化铝包覆量为1.0%时,材料具有较好的循环性能,1 C条件下,循环200周容量保持率为96.96%,锰酸锂为52.78%。 展开更多
关键词 锰酸锂 氧化铝涂层 不同包覆量 正极材料 电化学性能
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Regulating local chemical environment in O_(3)-type layered sodium oxides by dual-site Mg^(2+)/B^(3+)substitution achieves durable and high-rate cathode
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作者 Guangchang Yang Shenglong Yang +6 位作者 Jinlian Yu Yishun Xie Chunlei Tan feiyan lai Qianqian Jin Hongqiang Wang Xiaohui Zhang 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第9期469-474,共6页
The O_(3)-Na_(0.85)Ni_(0.2)Fe_(0.4)Mn_(0.4)O_(2)layered oxide cathode material possesses the advantages of high specific capacity,low cost,and simple synthesis.However,sluggish kinetics and complicated phase transitio... The O_(3)-Na_(0.85)Ni_(0.2)Fe_(0.4)Mn_(0.4)O_(2)layered oxide cathode material possesses the advantages of high specific capacity,low cost,and simple synthesis.However,sluggish kinetics and complicated phase transition caused by the large size difference between Na+and tetrahedral gaps lead to poor rate and cycling performance.Therefore,a scalable and feasible strategy was proposed to modulate local chemical environment by introducing Mg^(2+)and B^(3+)into O_(3)-Na_(0.85)Ni_(0.2)Fe_(0.4)Mn0.4O_(2),which can distinctly improve kinetic transport rate as well as electrochemical performance.The capacity retention of O_(3)-(Na_(0.82)Mg_(0.04))(Ni_(0.2)Fe_(0.4)Mn_(0.4))B_(0.02)O_(2)(NFMB)increases from 43.3%and 12.4%to 89.5%and 89.0%at 1 C and 3 C after 200 cycles,respectively.Moreover,the electrode still delivers high rate capacity of 93.9 mAh/g when current density increases to 10 C.Mg^(2+)ions riveted on Na layer act as a“pillar”to stabilize crystal structure and inhibit structural change during the desodiumization process.B^(3+)ions entering tetrahedral interstice of the TM layer strengthen the TM-O bond,lower Na+diffusion energy barrier and inhibits the slip of TM layer.Furthermore,the assembled full batteries with the modified cathode material deliver a high energy density of 278.2Wh/kg with commercial hard carbon as anode.This work provides a strategy for the modification of high-performance SIB layered oxide materials to develop the next-generation cost-effective energy storage grid systems. 展开更多
关键词 Sodium-ion batteries Layered cathode material DFT calculation Local chemistry environment Magnesium/boron co-substitution
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