摘要
用溶胶．凝胶法和高温固相法合成了三氧化二铬（Cr2O3）／二氧化钛（TiO2）复合材料，用XRD、SEM、恒流充放电和电化学阻抗谱（EIS）测试，分析了产物的结构、形貌和电化学性能。溶胶-凝胶法合成的复合材料具有更好的充放电性能，以20mA／g的电流在0-3V充放电，第20次循环的放电比容量为625．4mAh／g，放电容量保持率达61．9％。TiO2对Cr2O3的包覆，抑制了复合材料在充放电过程中的体积膨胀，稳定了固体电解质相界面（SEI）膜的结构，提高了电子电导率。
Chromium sesquioxide（Cr2O3）/titanium oxide（TiO2） composites were used to synthesized via sol-gel method and hightemperature solid-state method. The structure, morphology and electrochemical performance of the products were analyzed through XRD, SEM, charge-discharge and electrochemical impedance spectroscopy（EIS） tests. The composite synthesized via sol-gel method had better charge-discharge performance, when charged-discharged in 0 - 3 V with the current of 20 mA/g, its specific discharge capacity in the 20th cycle was 625.4 mAh/g, the discharge capacity retention was 61.9%. The coating of TiO2 to Cr2 O3 could inhibit the volume expansion of eompesite in charge-discharge process, stabilize the structure of solid electrolyte interface （SEI） film and improve the electronic conductivity.
出处
《电池》
CAS
CSCD
北大核心
2012年第6期310-313,共4页
Battery Bimonthly
基金
中央高校基本科研业务费专项资金(2010LKHX03
2010QNB04
2010QNB05)
中国矿业大学科技攀登计划(ON090237)
