CAJ | 학술논문

针对Li4Ti5O12导电性和倍率性能差的缺陷，以PEG为碳源采用溶胶-凝胶法制备出电池负极材料Li4Ti5O12/C，考察不同分子量聚乙二醇PEG（400、600、1000）做碳源制备的Li4Ti5O12/C复合材料电化学性能的优劣，采用热重分析仪（TG）、X 射线衍射仪（XRD）、扫描电镜（SEM）、透射电镜（TEM）、恒流充放电、倍率放电、交流阻抗（EIS）等方法对材料进行了结构表征和电化学性能测试。结果表明：以PEG1000为碳源时得到的Li4Ti5O12/C，0.1C下首次放电比容量为143.5 mA·h·g?1，2C的倍率下仍然保持了105 mA·h·g?1的比容量，容量保持率达到73.17%，并且此材料有最小的电阻，在大电流条件下有良好的电化学性能。
침대Li4Ti5O12도전성화배솔성능차적결함，이PEG위탄원채용용효-응효법제비출전지부겁재료Li4Ti5O12/C，고찰불동분자량취을이순PEG（400、600、1000）주탄원제비적Li4Ti5O12/C복합재료전화학성능적우렬，채용열중분석의（TG）、X 사선연사의（XRD）、소묘전경（SEM）、투사전경（TEM）、항류충방전、배솔방전、교류조항（EIS）등방법대재료진행료결구표정화전화학성능측시。결과표명：이PEG1000위탄원시득도적Li4Ti5O12/C，0.1C하수차방전비용량위143.5 mA·h·g?1，2C적배솔하잉연보지료105 mA·h·g?1적비용량，용량보지솔체도73.17%，병차차재료유최소적전조，재대전류조건하유량호적전화학성능。
In order to enhance electrical conductivity and rate capability of Li4Ti5O12, the Li4Ti5O12 /C powder was prepared by the sol-gel method, using PEG as carbon source. The performance of Li4Ti5O12 /C coated by three different molecular weight carbon sources: PEG (400, 600, and 1000), was investigated with TG, XRD, SEM, TEM, constant current charge-discharge, rate discharge and EIS. The material obtained by using PEG1000 as carbon source had the best electrochemical performance. Initial discharge capacity was 143.5 mA·h·g?1 at 0.1C rate, and discharge capacity remained 105 mA·h·g?1 at 2C rate, capacity retention ratio was 73.17%, in addition, it had the smallest resistance.