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Lithium carbonate and lithium hydroxide are both raw materials for batteries. In the market, the price of lithium carbonate has always been lower than that of lithium hydroxide. What is the difference between the two materials?

First of all, from the perspective of preparation technology, both can be extracted from spodumene, with little difference in cost. However, if the two are converted to each other, additional cost and equipment will be required, and the cost performance is not high.

Lithium carbonate is mainly prepared by sulfuric acid method. Lithium sulfate is obtained by reaction of sulfuric acid and spodumene. Sodium carbonate is added to lithium sulfate solution, and then precipitated and dried to prepare lithium carbonate;

Lithium hydroxide is mainly prepared by alkali method, that is, calcination of spodumene and calcium hydroxide, or the so-called sodium carbonate pressurization method, that is, the solution containing lithium is prepared first, and then lime is added to the solution to prepare lithium hydroxide.

In short, spodumene can be used to prepare lithium carbonate and lithium hydroxide, but the process routes are different, the equipment cannot be shared, and the cost is not too different. In addition, the cost of preparing lithium hydroxide from salt lake brine is much higher than that of preparing lithium carbonate.

Secondly, in terms of use, lithium hydroxide must be used for high-nickel ternary. NCA and NCM811 must use battery grade lithium hydroxide, while NCM622 and NCM523 can use both lithium hydroxide and lithium carbonate. Lithium iron phosphate (LFP) products prepared by hydrothermal method also need to use lithium hydroxide. Generally speaking, the products produced with lithium hydroxide usually have better performance.

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