CAJ | 학술논문

采用两步固相法，在交替气氛煅烧(空气预烧，氮气煅烧)下合成了尖晶石钛酸锂粉末，并且研究了煅烧气氛(空气和氮气)对不同合成阶段(预烧和煅烧)的影响。电化学测试结果表明，经空气预烧，氮气煅烧得到的样品在5的电流密度下，首次充电比容量高达128 mAh/g，100次循环后容量保持率达94.5%，其电化学性能明显优于单一气氛煅烧下所得样品。分析其原因为碳酸锂的分解反应在空气气氛下较氮气气氛下更容易进行，且氮气气氛下合成LTO有氧空位的存在。
채용량보고상법，재교체기분단소(공기예소，담기단소)하합성료첨정석태산리분말，병차연구료단소기분(공기화담기)대불동합성계단(예소화단소)적영향。전화학측시결과표명，경공기예소，담기단소득도적양품재5적전류밀도하，수차충전비용량고체128 mAh/g，100차순배후용량보지솔체94.5%，기전화학성능명현우우단일기분단소하소득양품。분석기원인위탄산리적분해반응재공기기분하교담기기분하경용역진행，차담기기분하합성LTO유양공위적존재。
Spinel Li4Ti5O12 (LTO) powders were prepared in a novel alternate atmosphere (first preheated in air, then calcined in nitrogen) by two-step solid state method. The influence of calcination atmosphere (air and nitrogen) on the different stages of synthesis process (precalcination and calcination process) was systematical y investigated. The electrochemical test results show that sample prepared in an alternate atmosphere delivers an initial charge specific capacity of 128 mAh/g with a capacity retention of 94.5% after 100 cycles at 5 and exhibits better electrochemical performance than the sample at a single atmosphere of air or nitrogen. It can be ascribed to the easier occurred decomposition of Li2CO3 in air and oxygen vacancies generated in low-oxygen partial pressure atmosphere (nitrogen).