利索-全球专利检索

  1. 登录
  2. 注册
发明公开
CN109917070A 三元正极材料中残留游离锂含量的检测方法 无效 - 驳回

三元正极材料中残留游离锂含量的检测方法
摘要：
本发明涉及一种三元正极材料中残留游离锂含量的检测方法，包括步骤：在密闭锥形瓶中，利用m1g三元正极材料和m2g煮沸过的蒸馏水制成溶液；利用氮气进行瓶内空气排空；常温磁力搅拌，并静置；利用针式过滤器将溶液快速过滤于收集瓶中，制成待测液；取出m3g待测液与另外煮沸的蒸馏水混合进行动态电位滴定，记录突跃点对应的体积V1和V2；使用如下公式计算Li2CO3和LiOH的含量：WLi2CO3＝CHCl×(V2-V1)×73.89÷1000÷(m1×m3÷m2)×100％；WLiOH＝CHCl×(2V1-V2)×23.941÷1000÷(m1×m3÷m2)×100％。本发明的三元正极材料中残留游离锂含量的检测方法，检测结果的误差小，精度高，并且能够有效判断测定过程的干扰情况。
摘要（英）：

The invention relates to a method for detecting a residual free lithium content in a ternary anode material. The method comprises the following steps of in a closed conical flask, using a m1g ternaryanode material and m2g boiled distilled water to prepare a solution; using a nitrogen gas to carry out air emptying in a bottle; carrying out magnetic stirring at a room temperature and standing; using a needle filter to rapidly filter the solution into a collecting bottle so as to prepare a liquid to be tested; taking the m3g liquid to be tested to mix with the boiled distilled water for dynamicpotentiometric titration, and recording volumes V1 and V2 corresponding to a jump point; and calculating contents of Li2CO3 and LiOH through using the following formulas: WLi2CO3=CHCl*(V2-V1)*73.89/1000/(m1*m3/m2)*100%; and WLiOH=CHCl*(2V1-V2)*23.941/1000/(m1*m3/m2)*100%. By using the method for detecting the residual free lithium content in the ternary anode material, an error of a detection result is small, precision is high, and an interference condition during a testing process can be effectively determined.

0/0