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Production method of lithium dihydrogen phosphate

A technology of lithium dihydrogen phosphate and its production method, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of impurity enrichment and impurity removal, increase the number of recycling times, reduce energy consumption, and avoid The effect of secondary "pollution

Active Publication Date: 2010-07-07
SICHUAN STATE LITHIUM MATERIALS
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a new method for preparing battery-grade lithium dihydrogen phosphate for the problems of impurity enrichment and impurity removal in the existing process - two-step reaction to produce battery-grade lithium dihydrogen phosphate

Method used

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  • Production method of lithium dihydrogen phosphate
  • Production method of lithium dihydrogen phosphate
  • Production method of lithium dihydrogen phosphate

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Embodiment 1

[0034] a. Raw material preparation:

[0035]Preparation of LiOH solution: Dissolve lithium hydroxide monohydrate to a saturated solution with soft water, press filter to remove insoluble impurities in the raw material LiOH, and prepare in appropriate amount according to the production task.

[0036] h 3 PO 4 Solution preparation: Purchase food-grade industrial phosphoric acid with a concentration of 85%, and convert it according to the actual measurement in the laboratory during production, and accurately measure it.

[0037] b. Mix LiOH saturated solution with H 3 PO 4 The solution is reacted at normal temperature and normal pressure to obtain lithium phosphate precipitation;

[0038] c. Phosphoric acid reacts with lithium hydroxide to form lithium phosphate precipitate, soluble impurities such as K, Na, SO 4 -2 Waiting in the liquid phase, solid-liquid separation can realize the physical separation of impurities;

[0039] d. Calculate the addition amount according to ...

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Abstract

The invention relates to a production method of lithium dihydrogen phosphate, in particular to a production method of battery-grade lithium dihydrogen phosphate, which belongs to the technical field of lithium dihydrogen phosphate manufacturing. In order to solve the problems of rich impurities and difficult impurity removal of the prior art, the invention provides a novel preparation method of battery-grade lithium dihydrogen phosphate, which prepares the battery-grade lithium dihydrogen phosphate through two steps of reaction. The production method of lithium dihydrogen phosphate of the invention comprises the following steps: step 1: lithium hydroxide and phosphate in the molar ratio of Li3PO3:H3PO4=3:1 react to prepare lithium precipitation; and step 2: the lithium precipitation and the phosphate in the molar ratio of Li3PO3:H3PO4=1:2 react to prepare lithium dihydrogen phosphate. The process adopts a physical impurity removal method, reduces the requirements of product impurities on the purity of raw material monohydrate lithium hydroxide, can adopt low-quality lithium hydroxide (below national standard 2) with quite high content of soluble impurities, such as K, Na and the like, simultaneously, reduces the energy consumption, and can save energy and reduce consumption by more than 30 percent compared with the prior art.

Description

technical field [0001] The invention relates to a production method of lithium dihydrogen phosphate, in particular to a production method of battery-grade lithium dihydrogen phosphate, and belongs to the technical field of lithium dihydrogen phosphate manufacture. Background technique [0002] Lithium-ion batteries are the latest generation of secondary battery products that emerged in the early 1990s, and there is currently no foreseeable alternative. There are many kinds of positive electrode materials for lithium-ion batteries, mainly including lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, ternary materials, lithium iron phosphate, etc. LiFePO 4 It was first introduced into the potential positive electrode material of lithium batteries by Dr. John in the United States in 1996. Lithium iron phosphate has only appeared in recent years as a material for lithium ion power batteries. Large-capacity lithium iron phosphate has been developed domestically....

Claims

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Application Information

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IPC IPC(8): C01B25/30
Inventor 陈思伟
Owner SICHUAN STATE LITHIUM MATERIALS
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