锂-硅合金中活性锂的测定

Determination of active lithium in lithium silicon alloy

研究了锂合金热电池的负极锂－硅合金中活性锂（未氧化的锂）的测定方法，采用气体容量法进行测定。将锂－硅合金与无水乙醇反应，用气体容量法准确测定置换出的氢气体积，用电感耦合等离子发射光谱法测出反应后乙醇溶液中硅的含量。由测出的总Ｈ２量减去硅置换出的Ｈ２量，得到活性锂置换出的Ｈ２量，由此可算出活性锂的含量。当活性锂的含量在３０％左右时，该方法测定的相对标准偏差≤５．５％。

The active lithium in lithium silicon alloy is measured indirectly by gas-volumetric method. The amount of active lithium is equal to the total amount of hydrogen produced while lithium silicon alloy react with alcohol minus the amount of hydrogen produced by silicon reacting with alcohol. The silicon in the alcohol solution is measured by ICP AES. RSD≤5.5% while the content of active lithium is 30% or so.