含钴钨酸盐在锂离子电池中的循环性能表现  

The cyclic performance of cobalt-contained tungstates in lithium-ion batteries

作　　者：黄城鑫 朱睿 杨磊 朱欣 王丽维 徐京京 HUANG Chengxin;ZHU Rui;YANG Lei;ZHU Xin;WANG Liwei;XU Jingjing(College of Chemistry and Materials Science,Shanghai Normal University,Shanghai 200234,China)

机构地区：[1]上海师范大学化学与材料科学学院,上海200234

出　　处：《上海师范大学学报（自然科学版中英文）》2024年第1期28-34,共7页Journal of Shanghai Normal University(Natural Sciences)

基　　金：上海市自然科学基金(22ZR1445900);国家自然科学基金面上项目(21772123);上海绿色能源化工工程技术研究中心(18DZ2254200);光化学能源材料学科创新引智基地(D18020);上海市部分地方院校能力建设专项(21010503400)。

摘　　要：基于多金属氧酸盐(POM)在锂离子电池负极材料领域的潜在应用价值,根据文献选择了新型三价钴多金属钨酸盐Ba_(3)[BW_(11)O_(39)Co^(Ⅲ)(H_(2)O)]这一稳定的无机金属杂多酸,对其作为负极材料在锂离子电池应用中的性能进行了全面的测试,并将其与二价钴多金属钨酸盐Ba_(3.5)[BW_(11)O_(39)Co^(Ⅱ)(H_(2)O)]的性能做了对比.结果表明:三价钴材料在200 mA·g^(-1)的电流密度下循环200圈后仍能保持269.2 mAh·g^(-1)的比容量,库伦效率达99.29%.即使在0.2~5.0 A·g^(-1)的电流密度下进行倍率测试,其仍表现出比二价钴材料更好的性能,在电流密度恢复到0.2 A·g^(-1)后,比容量迅速恢复到454 mAh·g^(-1),证明其具有更好的稳定性和倍率性能,为后续含钴钨酸盐在锂离子电池领域的应用提供了更多的参考价值.Considering the potential application of polyoxometalates(POMs)as anode materials in the field of lithium-ion batteries,we selected a novel trivalent cobalt POM Ba_(3)[BW_(11)O_(39)Co^(Ⅲ)(H_(2)O)],a stable inorganic metal heteropolyacid,according to the literatures.Its performance as an anode material in lithium-ion batteries was comprehensively tested and compared with that of a divalent cobalt polyoxotungstate Ba_(3.5)[BW_(11)O_(39)Co^(Ⅱ)(H_(2)O)].The results show that even after 200 cycles at a current density of 200 mA·g^(-1),the trivalent cobalt material can still maintain a specific capacity of 269.2 mAh·g^(-1)with a Coulombic efficiency of 99.29%.Furthermore,the rate tests at the current density range from 0.2 to 5.0 A·g^(-1)show that the trivalent cobalt material still exhibits better performance than divalent one.After the current density recovers to 0.2 A·g^(-1),the specific capacity quickly recovers to 454 mAh·g^(-1),demonstrating that the trivalent cobalt material has better stability and rate performance.These findings provide valuable references for the future application of cobalt-contained tungstates in the field of lithium-ion batteries.

关 键 词：多金属氧酸盐(POM) 锂离子电池 负极材料 新型能源材料 

分 类 号：O611.3[理学—无机化学]