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Preparation method of battery-grade lithium hydroxide monohydrate

A technology of lithium hydroxide monohydrate and lithium hydroxide, applied in the direction of lithium oxide;/hydroxide, etc., can solve the problems of large supersaturation, small particle size, and impurities contained in mother liquor

Active Publication Date: 2021-01-29
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Good-quality lithium hydroxide monohydrate products have large grains, complete crystal form, non-bonding, and white crystals. However, the domestic preparation of lithium hydroxide monohydrate usually adopts the method of evaporation and crystallization. The evaporation process is relatively rough, and the crystallization process is too high If the saturation is high, the formation of crystal nuclei and crystal growth will occur at the same time, which will easily lead to the inclusion of impurities in the mother liquor, resulting in small particle size, more powdery crystals, and uneven grain size.

Method used

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  • Preparation method of battery-grade lithium hydroxide monohydrate
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  • Preparation method of battery-grade lithium hydroxide monohydrate

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preparation example Construction

[0023] A preparation method of battery-grade lithium hydroxide monohydrate, the steps comprising:

[0024] (1) Dissolve the crude lithium hydroxide monohydrate product and pure water according to the liquid-solid ratio (i.e. pure water L and crude lithium hydroxide monohydrate product kg) 3.8-4.0:1, and filter out trace insolubles to obtain hydrogen Lithium oxide solution; wherein, in the crude lithium hydroxide monohydrate product (the crude lithium hydroxide solution is evaporated and concentrated to 30-40 Baume degrees, and the product obtained after cooling, crystallization and centrifugation), the water content is 2 SO 4 The content is less than 5%, the main component LiOH>50%; Li in lithium hydroxide solution: 30-40g / L, Na≤3g / L, SO 4 2- ≤3g / L;

[0025] (2) Add the lithium hydroxide solution obtained in step (1) into the concentration kettle for heating and concentration, wherein the heating and concentration is carried out at a heating rate of 0.5-2°C / min, and the heat...

Embodiment 1

[0030] A preparation method of battery-grade lithium hydroxide monohydrate, the steps comprising:

[0031] (1) Dissolve the crude lithium hydroxide monohydrate product with pure water at a liquid-solid ratio (L / kg) of 3.8:1, filter out insolubles to obtain a lithium hydroxide solution; wherein, the crude lithium hydroxide monohydrate product The water content in the medium is 4.8%, the main impurity is Na 2 SO 4 The content is 2.9%, the main component LiOH is 54.0%; in lithium hydroxide solution: Li 40g / L, Na 3g / L, SO 4 2- 3g / L;

[0032] (2) the 1m obtained through step (1) 3 The lithium hydroxide solution is added into the concentration kettle for heating and concentration, wherein the heating and concentration is carried out at a heating rate of 0.5°C / min, and the heating temperature is 90°C until the concentration of the lithium hydroxide solution reaches 25 degrees Baume to obtain a concentrated solution;

[0033] (3) will 1m 3 The concentrated solution was transferr...

Embodiment 2

[0038] A preparation method of battery-grade lithium hydroxide monohydrate, the steps comprising:

[0039] (1) Dissolve the crude lithium hydroxide monohydrate product and pure water at a liquid-solid ratio (L / kg) of 4.0:1, and filter out the insolubles to obtain a lithium hydroxide solution; wherein, the crude lithium hydroxide monohydrate product Moisture content 4%, main impurity Na 2 SO 4 Content 2%, main content LiOH 56%; lithium hydroxide solution: Li 30g / L, Na 0.9g / L, SO 4 2- 1.95g / L;

[0040] (2) the 1m obtained through step (1) 3 The lithium hydroxide solution is added into the concentration kettle for heating and concentration, wherein the heating and concentration is carried out at a heating rate of 2°C / min, and the heating temperature is 95°C until the concentration of the lithium hydroxide solution reaches 28 degrees Baume to obtain a concentrated solution;

[0041] (3) will 1m 3 The concentrated solution was transferred to the crystallization tank for cooli...

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Abstract

The invention relates to a preparation method of battery-grade lithium hydroxide monohydrate, which comprises the following steps: (1)dissolving a crude lithium hydroxide monohydrate product in pure water, and filtering out insoluble substances to obtain a lithium hydroxide solution; (2)adding the lithium hydroxide solution into a concentration kettle, and carrying out heating concentration untilthe concentration of the lithium hydroxide solution reaches 25-30 baume degrees, so as to obtain a concentrated solution; (3)transferring the obtained concentrated solution into a crystallization kettle for cooling crystallization to 60 DEG C to 75 DEG C, and adding a lithium hydroxide monohydrate seed crystal into the concentrated solution to induce crystallization; and (4)carrying out cooling crystallization at a cooling rate of 10-15 DEG C / h until the temperature is reduced to room temperature, and sequentially carrying out centrifugal separation and drying to obtain the battery-grade lithium hydroxide monohydrate product. The battery-grade lithium hydroxide monohydrate product prepared by the method is large in crystal grain and uniform in granularity.

Description

technical field [0001] The invention relates to the technical field of lithium battery cathode materials, in particular to a method for preparing battery-grade lithium hydroxide monohydrate. Background technique [0002] Battery-grade lithium hydroxide monohydrate is the core raw material for the production of ternary lithium battery cathode materials, mainly including NCA, NCM, high-nickel materials, etc. As Tesla, the global leader in new energy vehicles, chooses the ternary lithium battery material made of lithium hydroxide, it has set off a global upsurge in the development of lithium hydroxide. [0003] Good-quality lithium hydroxide monohydrate products have large grains, complete crystal form, non-bonding, and white crystals. However, the domestic preparation of lithium hydroxide monohydrate usually adopts the method of evaporation and crystallization. The evaporation process is relatively rough, and the crystallization process is too high If the saturation is high, ...

Claims

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Application Information

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IPC IPC(8): C01D15/02
CPCC01D15/02C01P2004/60C01P2006/80Y02E60/10
Inventor 许开华王文杰李琴香张坤
Owner JINGMEN GEM NEW MATERIAL