以共沉淀氢氧化物为前驱体制备了F-掺杂化合物LiNi3/8Co2/8Mn3/8O2-yFy(y:0,0.05,0.10,0.20),采用XRD、XPS、SEM、循环伏安(CV)、充放电测试、DSC等表征了其结构与性能.结果表明,F-掺杂置换部分O2-生成固溶体,不改变样品中过渡金属离子的价态.F-掺杂量y为0.05、0.10时,比容量不受影响,但在充放电过程中ch方向膨胀率由未掺杂样的2.06%分别下降至1.017%、1.018%,改善了其结构稳定性与循环寿命,30周后容量保持率分别达97.5%、96.2%;而y增至0.20时,离子混乱度升高,且颗粒间烧结过于严重,内阻增加,使容量与循环特性再度恶化.F-掺杂还促进材料烧结,使该材料粒径通过粉碎分级控制成为可能,有利于该材料电极的制备.另外,F-掺杂也使LiNi3/8Co2/8Mn3/8O2热稳定性得到一定程度改善.
参考文献
[1] | Iwahori T, Ozaki Y, Funahashi A, et al. J. Power Sources, 1999, 81-82: 872-876. |
[2] | Broussely M. J. Power Sources, 1999, 81-82: 140-143. |
[3] | Tanaka T, Ohta K, Arai N. J. Power Sources, 2001, 97-98: 2-6. |
[4] | Nishi Y. J. Power Sources, 2001, 100: 101-106. |
[5] | Leisingh R A, Palazzo M J, Takeuchi E S, et al. J. Electrochem. Soc., 2001, 148: A838-A844. |
[6] | MacNeil D D, Lu Zh, Chen Zh, et al. J. Power Sources, 2002, 108: 8-14. |
[7] | Lu Zh, MacNeil D D, Dahn J R. Electrochem. Solid-State Lett., 2001, 4: A191-A194. |
[8] | Ohzuku T, Makimura Y. Chem. Lett., 2001, 744-755. |
[9] | Kang S -H, Kim J, Stoll M E, et al. J. Power Sources, 2002, 112: 41-48. |
[10] | Lu Zh, MacNeil D D, Dahn J R. Electrochem. Solid-State Lett., 2001, 4: A200-A203. |
[11] | Kim J -S, John C S, Thackeray M M. Electrochem. Commun., 2002, 4: 205-209. |
[12] | Shaju K M, Subba Rao G V, Chowdari B V R, et al. Electrochimica Acta, 2002, 48: 145-151. |
[13] | Kubo K, Fujiwara M, Yamada S, et al. J. Power Sources, 1997, 68: 553-557. |
[14] | Amatucci G G, Pereira N, Zheng T, et al. J. Power Sources, 1999, 81-82: 39-43. |
[15] | Whitfield P S, Davidson I J. J. Electrochem. Soc., 2000, 147: 4476-4484. |
[16] | Ohzuku T, Ueda A, Nagayama M, et al. Electrochimica Acta, 1993, 38: 1159-1167. |
[17] | 陆佩文.无机材料科学基础.武汉:武汉大学出版社,1996.65-72. |
[18] | Rougier A, Gravereau P, Delmas C. J. Electrochem. Soc., 1996, 143: 1168-1175. |
[19] | Wang H, Jang Y -I, Huang B, et al. J. Electrochem. Soc., 1999, 146: 473-480. |
[20] | Cho J, Park B. J. Power Sources, 2001, 92: 35-39. |
[21] | Yu A, Subba Rao G V, Chowdari B V R. Solid State Ionics, 2000, 135: 131-135. |
[22] | Cho J, Jung H-S, Park Y-C, et al. J. Electrochem. Soc., 2000, 147: 15-20. |
[23] | Chowdari B V R, Subba Rao G V, Chow S Y. Solid State Ionics, 2001, 140: 55-62. |
[24] | Paulsen J M, Thomas C L, Dahn J R. J. Electrochem. Soc., 2000, 147: 861-868. |
[25] | Moshtev R, Zlatilova P, Manev V, et al. J. Power Sources, 1996, 62: 59-66. |
[26] | 李建刚,万春荣,杨冬平,等(LI Jian-Gang,et al).物理化学学报(Acta Phys.-Chim.Sin.),2003,19:1030-1034. |
[27] | Wagner C, Riggs W, Davis L, et al. Handbook of X-ray Photoelectron Spectroscopy, Edited by: Muilenberg G E. Perkin Elmer Corporation, Eden Prairie, Minnesota, 1979. 74-80. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%