Two-step addition of acetylene black to hydrated sodium manganese oxide: its effect on the performance of rapid discharge cathode

被引:31
作者
Hibino, M [1 ]
Kawaoka, H [1 ]
Zhou, HS [1 ]
Honma, I [1 ]
机构
[1] AIST, Energy Elect Inst, Tsukuba, Ibaraki 3058568, Japan
关键词
sodium manganese oxide; cathode material; lithium battery; rapid discharge; composite material;
D O I
10.1016/S0378-7753(03)00596-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Hydrated sodium manganese oxide (HSMO) was synthesized by reducing sodium permanganate with ethanol. The discharge and charge properties for mixtures of HSMO and acetylene black (AB) were investigated. AB was added twice, first while synthesizing HSMO and next while preparing the electrode. AB in synthesis resulted in the appearance of an additional redox reaction below 2 V versus Li/Li+ and was effective in enlarging the discharge and charge capacity. On the other hand, AB added during electrode fabrication reduced resistance and improved cycle performance. In discharge-charge tests using 10 A g(-1) HSMO, 45 mAh g(-1) composite of specific capacity could be maintained after 10 cycles, if AB was added at levels (in weight ratio to HSMO) of 0.25 during synthesis and 0.75 in electrode fabrication, or 0.5 and 0.5, respectively. This current and capacity corresponded to a power density of 10 kW kg(-1) and an energy density of 90 Wh kg(-1) assuming an operating voltage of 2.0 V. (C) 2003 Elsevier B.V All rights reserved.
引用
收藏
页码:143 / 147
页数:5
相关论文
共 13 条
  • [11] LITHIUM INSERTION INTO MANGANESE SPINELS
    THACKERAY, MM
    DAVID, WIF
    BRUCE, PG
    GOODENOUGH, JB
    [J]. MATERIALS RESEARCH BULLETIN, 1983, 18 (04) : 461 - 472
  • [12] Syntheses and characterization of well-crystallized birnessite
    Yang, DS
    Wang, MK
    [J]. CHEMISTRY OF MATERIALS, 2001, 13 (08) : 2589 - 2594
  • [13] YU JJ, 1998, SOLID STATE LETT, V1, P1