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Lithium hydroxide monohydrate, preparation method and application thereof, lithium ion battery cathode material and lithium ion battery

A lithium hydroxide, monohydrate technology, applied in the field of membrane separation, can solve the problems of increasing resin usage, large equipment scale, low monohydrate lithium hydroxide, etc., and achieve the effect of low residual lithium content and low magnetic element content

Active Publication Date: 2021-07-20
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because most of the salt lake brine in my country has a high magnesium-lithium ratio, it is very difficult to mine. For example, the document CN107720785A discloses a method for preparing lithium hydroxide based on membrane separation technology. In this document, the diluted old brine is directly used as nanofiltration Stock solution, due to the high concentration of Mg ions in the old salt lake brine (70000-100000ppm), it takes a lot of pure water to dilute the brine (more than 10 times the volume of brine) to achieve the concentration of divalent ions in the nanofiltration stock solution It is lower than the requirement of 8000ppm, which not only greatly increases the amount of water to be treated in nanofiltration and subsequent processes, resulting in large-scale equipment and high equipment costs, but also due to divalent and The content of multivalent ions is high, which leads to the unsatisfactory effect of impurity removal in the nanofiltration membrane separation process, which is not conducive to obtaining lithium hydroxide monohydrate with low magnetic content.
Secondly, the patented process needs to use hydrochloric acid to adjust the acidity, which is not conducive to environmental protection
In addition, the ion exchange section of this patent is located after the nanofiltration process, which not only increases the amount of resin used, but also increases the corresponding concentration of impurity ions in the subsequent lithium enrichment and concentration process, which is very likely to cause final The content of impurity ions including magnetic elements in the product lithium hydroxide monohydrate is relatively high

Method used

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  • Lithium hydroxide monohydrate, preparation method and application thereof, lithium ion battery cathode material and lithium ion battery
  • Lithium hydroxide monohydrate, preparation method and application thereof, lithium ion battery cathode material and lithium ion battery
  • Lithium hydroxide monohydrate, preparation method and application thereof, lithium ion battery cathode material and lithium ion battery

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Effect test

Embodiment 1

[0080] 380L salt lake old brine was contacted with 25kg aluminum salt adsorbent for adsorption treatment, then contacted with 38L pure water for rinsing treatment and 100L pure water for cover washing treatment (the lithium sorbent after leaching treatment was sequentially washed with the secondary cover Washing solution, one-time cover washing solution and pure water are contacted to carry out three-time cover washing treatment) after desorption, obtain the lithium-containing desorption solution after preliminary impurity removal. Li of the lithium-containing desorption solution + The content is 400ppm, Mg 2+ The content is 1800ppm, Cu 2+ Content less than 1ppm, Cr 3+ Content less than 1ppm, Fe 3+ The content is 9ppm, Zn 2+ The content is 5ppm, Ni 2+ The content is 5ppm. The lithium-containing desorption liquid is used as the nanofiltration feed liquid, and under the conditions of operating pressure of 3.5 MPa and operating water temperature of 20-30 ° C, the first-leve...

Embodiment 2

[0082] 380L salt lake old brine was contacted with 25kg aluminum salt adsorbent for adsorption treatment, and then rinsed with 38L pure water and jacketed with 100L pure water. Washing solution and pure water contact to carry out three sets of washing treatment) after desorption, obtain the lithium-containing desorption solution after preliminary impurity removal. Li of the lithium-containing desorption solution + The content is 450ppm, Mg 2+ Content is 2000ppm, Cu 2+ Content less than 1ppm, Cr 3+ Content less than 1ppm, Fe 3+ The content is 10ppm, Zn 2+ The content is 4ppm, Ni 2+ The content is 4ppm. The lithium-containing desorption solution is used as the nanofiltration stock solution, and under the conditions of operating pressure of 3.5MPa and operating water temperature of 20-30°C, the primary nanofiltration treatment is performed through the nanofiltration membrane, and the concentrated water of the primary nanofiltration is discharged back to the salt field. The...

Embodiment 3

[0084] 380L salt lake old brine was contacted with 25kg aluminum salt adsorbent for adsorption treatment, and then rinsed with 38L pure water and jacketed with 100L pure water. Cover washing solution and pure water contact to carry out three sets of washing treatment) after desorption, obtain the lithium-containing desorption solution after preliminary impurity removal. Li of the lithium-containing desorption solution + The content is 500ppm, Mg 2+ Content is 2000ppm, Cu 2+ Content less than 1ppm, Cr 3+ Content less than 1ppm, Fe 3+ The content is 10ppm, Zn 2+ The content is 3ppm, Ni 2+ The content is 3ppm. The lithium-containing desorption solution is used as the nanofiltration stock solution, and under the condition of operating pressure of 3.5MPa and operating water temperature of 20-30°C, the first-level nanofiltration treatment is carried out through the nanofiltration membrane, and the nanofiltration permeate is used as the reverse osmosis feed Under the condition...

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Abstract

The present disclosure relates to a lithium hydroxide monohydrate, its preparation method and use, and lithium ion battery cathode material and lithium ion battery. The particle size of the lithium hydroxide monohydrate is 100-380 nm, and the monohydrate The content of Cu in lithium hydroxide is less than 1ppm, the content of Cr is less than 1ppm, the content of Ni is less than 2ppm, the content of Zn is less than 2ppm, and the content of Fe is less than 4ppm. The lithium hydroxide monohydrate has a low content of magnetic elements, and when used to prepare lithium-ion battery cathode materials, can improve the service life of the lithium-ion battery and reduce its self-discharge effect.

Description

technical field [0001] The present disclosure relates to the technical field of membrane separation, in particular to lithium hydroxide monohydrate, its preparation method and application, lithium ion battery cathode material and lithium ion battery. Background technique [0002] As an important industrial raw material, lithium hydroxide monohydrate is widely used in chemical industry, national defense, aerospace and energy storage. The lithium-based grease produced by lithium hydroxide monohydrate has the advantages of anti-oxidation, good fire resistance, wide applicable temperature range, and stable cycle performance. In the field of national defense, it can be used as a heat carrier for nuclear reactors and a protective agent for metal surfaces. In the field of aerospace, lithium hydroxide monohydrate can be used to purify the air in submarines and as a breathing mask for aviation pilots. In particular, with the rapid development of the lithium battery industry, lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/02
CPCC01D15/02C01P2002/72C01P2004/03C01P2006/40C01P2006/80
Inventor 徐云玲李阳曹文玉徐茶清周虎
Owner BYD CO LTD
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