摘要
以草酸、硼酸和氢氧化锂为原料,采用两步法合成锂离子电池用电解质锂盐双草酸硼酸锂(LiBOB)。通过正交实验确定双草酸硼酸酯(HBOB)的最佳合成条件为:n(草酸)∶n(硼酸)=2.2∶1.0,反应温度90℃,反应时间4 h。由单因素实验确定合成LiBOB的最佳工艺条件为:n(HBOB)∶n(Li OH)=1.0∶0.6、中和反应温度100℃,中和反应时间4 h。在此条件下,LiBOB的转化率为83.61%。用XRD、红外光谱(FT-IR)、核磁共振碳谱(NMR)13C-NMR、1H-NMR和热重(TG-DTG)测试等对合成样品进行分析。合成的LiBOB纯度较高,且热稳定性较好。在50℃下,使用Li PF6+LiBOB混合电解液的052545型软包装电池以1 C在3.00~4.35 V循环50次,容量衰减率为7.6%,低于使用纯Li PF6电解液的电池。
Lithium electrolyte salts double oxalate lithium borate (LiBOB) used for Li-ion battery was synthesized via two-step method with oxalic acid, boric acid and lithium hydroxide as raw materials. By orthogonal experiment, the best synthesizing conditions for bisoxalatoborate ester (HBOB) were as follows : n (oxalicacid) : n ( boric acid) = 2. 2: 1.0, reaction temperature 90℃, reaction time 4 h. By single factor experiment,the best synthesis conditions of LiBOB were as follows:n( HBOB):n(LiOH) = 1.0: 0. 6, neutralization reaction temperature 100℃, neutralization reaction time 4 h. The conversion rate of LiBOB was 83.61% under the condition. The synthesized samples were characterized by XRD,infrared spectroscopy( FT-IR), t3C-nuclear magnetic resonance (NMR), 1H-NMR and thermogravimetric(TG-DTG) tests. The synthesized LiBOB had higher purity and better thermal stability. At 50 ℃, after 50 cycles with 1 C in 3. 00 -4. 35 V, the capacity fading rate of 052545 type soft pack battery using LiPF6 + LiBOB mixed electrolyte was 7. 6% ,lower than that of pure LiPF6 electrolyte.
作者
陈姚
杨倩韵
于欣伟
陈胜洲
CHEN Yao YANG Qian-yun YU Xin-wei CHEN Sheng-zhou(School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, Guangdong 510006, China)
出处
《电池》
CAS
CSCD
北大核心
2016年第5期251-254,共4页
Battery Bimonthly
基金
广东省科技计划项目(2013B01405015)
广州市高校科研项目(1201420606)
广州市科技计划项目(20150903005)
关键词
锂离子电池
合成
两步法
电解质
双草酸硼酸锂
Li-ion battery
synthesis
two-step method
electrolyte
lithium bis(oxalate) borate