A method of detecting surface lithium of a ternary cathode material
A positive electrode material and detection method technology, which is applied in the direction of chemical analysis by titration method, can solve the problems of large detection errors of lithium carbonate and lithium hydroxide, achieve the effects of short detection time, reduce errors, and improve accuracy
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Embodiment 1
[0028] The detection method of the lithium on the surface of the ternary positive electrode material of the present embodiment is to measure the lithium on the surface of the ternary positive electrode material of 622, comprising the following steps:
[0029] 1) Weigh 30g of sample into a 250ml beaker, add 100mL of deionized water, stir on a magnetic stirrer for 30min, then let it stand for 30min, vacuum filter with a 0.45μm microporous membrane, and the filtrate is the sample to be tested solution;
[0030] 2) Take 20mL of filtrate into a 100mL Erlenmeyer flask, place the Erlenmeyer flask on a magnetic stirrer, add two drops of phenolphthalein indicator first, the solution to be tested turns red, and then titrate with 0.1mol / L standard hydrochloric acid solution to Colorless, record the volume V of standard hydrochloric acid solution consumed 1 (mL), then add 5 drops of methyl red indicator, the system turns yellow, titrate to orange with standard hydrochloric acid solution,...
Embodiment 2
[0042] The detection method of the lithium on the surface of the ternary positive electrode material of the present embodiment is to measure the lithium on the surface of the ternary positive electrode material of 622, comprising the following steps:
[0043] 1) Weigh 30g of sample into a 250ml beaker, add 100mL of deionized water, place it on a magnetic stirrer and stir for 40min, then let it stand for 30min, vacuum filter with a 0.45μm microporous membrane, and the filtrate is the sample to be tested solution;
[0044] Step 2), step 3) are identical with embodiment 1.
Embodiment 3
[0046] The detection method of the lithium on the surface of the ternary positive electrode material of the present embodiment is to measure the lithium on the surface of the ternary positive electrode material of 622, comprising the following steps:
[0047] 1) Weigh 30g of sample into a 250ml beaker, add 100mL of deionized water, stir on a magnetic stirrer for 60min, then let it stand for 30min, vacuum filter with a 0.45μm microporous membrane, and the filtrate is the sample to be tested solution;
[0048] Step 2), step 3) are identical with embodiment 1.
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