Coated lithium ion sieve and preparation method thereof

A lithium-ion, coated technology, which is applied in the field of coated lithium-ion sieve and its preparation, can solve the problems of low dissolution loss rate and poor adsorption performance, and achieve the solution of easy dissolution loss, good stability and easy industrialization Effect

Pending Publication Date: 2021-05-14
LIS MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results showed that LiAl 0.5 mn 1.5 o 4 Exhibited higher Li during acid treatment + adsorption rate and lower dissolution rate of Mn and Al, while LiNi 0.5 mn 1.5 o 4 and LiTi 0.5 mn 1.5 o 4 Spinel Li + Relatively poor adsorption performance

Method used

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  • Coated lithium ion sieve and preparation method thereof
  • Coated lithium ion sieve and preparation method thereof
  • Coated lithium ion sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a coated lithium ion sieve, comprising the steps of:

[0029] S01: MnCO 3 Calcined in air atmosphere for 5h to obtain Mn 2 o 3 ;

[0030] S02: Mn 2 o 3 Mix and grind with lithium salt, transfer to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, put the reaction kettle in an oven, and carry out hydrothermal reaction at a reaction temperature of 120°C, and the reaction time is 48h; after the reaction is completed , put the obtained product into an oven and dry at 60°C for 12h to obtain the product LiMnO 2 ; Among them, Mn 2 o 3 The molar ratio of Li / Mn in lithium salt is 1:1;

[0031]It is worth noting that the actual amount of lithium salt used is 1.00-1.05 times of its theoretical amount. This is because the required precursor product can be obtained by one calcination, and the loss of lithium salt is small, so the amount of lithium salt can be increased. The theoretical amount or slightly excessive amount is adopte...

Embodiment 2

[0039] A method for preparing a coated lithium ion sieve, comprising the steps of:

[0040] S01: MnCO 3 Calcined under air atmosphere for 2h to obtain Mn 2 o 3 ;

[0041] S02: Mn 2 o 3 Mix and grind with lithium salt, transfer to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, put the reaction kettle into an oven, and carry out hydrothermal reaction at a reaction temperature of 120°C for a reaction time of 36 hours; after the reaction is completed , put the obtained product into an oven and dry at 60°C for 12h to obtain the product LiMnO 2 ; Among them, Mn 2 o 3 The molar ratio of Li / Mn in lithium salt is 10:1;

[0042] S03: Add 1g LiMnO to 4M lithium nitrate solution 2 Ultrasound for 2 hours, and dry at 60°C for 36 hours. After the dried powder is fully mixed in the grinding process, put it into a crucible and place it in a muffle furnace. The phase reaction was 2h, and the oxide-coated Li 1.6 mn 1.6 o 4 Lithium ion adsorbent; among them, t...

Embodiment 3

[0045] A method for preparing a coated lithium ion sieve, comprising the steps of:

[0046] S01: MnCO 3 Calcined under air atmosphere for 10h to obtain Mn 2 o 3 ;

[0047] S02: Mn 2 o 3 Mix and grind with lithium salt, transfer to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, put the reaction kettle in an oven, and carry out hydrothermal reaction at a reaction temperature of 200°C, and the reaction time is 72h; after the reaction is completed , put the obtained product into an oven and dry at 60°C for 12h to obtain the product LiMnO 2 ; Among them, Mn 2 o 3 The molar ratio of Li / Mn in lithium salt is 5:1;

[0048] S03: Add 1g LiMnO to 4M manganese nitrate solution 2 Ultrasound for 10 hours, and dry at 60°C for 36 hours. After the dried powder is fully mixed in the grinding process, it is put into a crucible and placed in a muffle furnace. Phase reaction for 10 h yielded oxide-coated Li 1.6 mn 1.6 o 4 Lithium ion adsorbent; among them, the ...

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Abstract

The invention discloses a method for preparing a coated lithium ion sieve. The method comprises the following steps of: S01, calcining manganese salt in an air atmosphere for 2-10 hours to obtain Mn2O3; S02, mixing and grinding Mn2O3 and a lithium salt, and reacting in a high-pressure reaction kettle at 100-200 DEG C for 36-72 hours to obtain a product LiMnO2, the molar ratio of Mn2O3 to Li / Mn in the lithium salt being (1-10): 1; S03, adding 0.5-5g of LiMnO2 into a metal coating reagent, carrying out ultrasonic treatment for 2-10 hours, drying for 6-24 hours, and calcining at the temperature of 400-600 DEG C for 2-10 hours to obtain an oxide coated Li1.6Mn1.6O4 lithium ion adsorbent, the molar ratio of the metal coating reagent to the LiMnO2 being (0.01-0.08): 1; and S04, carrying out acidizing treatment on the oxide coated Li1.6Mn1.6O4 lithium ion adsorbent, and washing and drying an acidizing treatment product to obtain the coated lithium ion sieve. The coated lithium ion sieve has a more stable unit cell structure, the problem that a traditional HMn2O4 lithium ion sieve is prone to solution loss is solved, and the coated lithium ion sieve can be repeatedly recycled.

Description

technical field [0001] The invention relates to the field of lithium ion sieves, in particular to a coated lithium ion sieve and a preparation method thereof. Background technique [0002] The wide application of power and energy storage lithium batteries in new energy sources has led to a continuous increase in the global demand for lithium resources. It is widely used in emerging fields such as lubricants, ceramics, pharmaceuticals, batteries, and atomic energy. It has become a national economy and national defense construction. important strategic resource. [0003] At present, spinel-type lithium manganese oxide (LMO) has a high adsorption capacity and Li + Selectivity has given rise to considerable research interest, including LiMn 2 o 4 , Li 1.33 mn l.67 o 4 and Li 1.6 mn 1.6 o 4 . Among all LMO spinel materials, Li 1.6 mn 1.6 o 4 Most representative because of its high theoretical adsorption capacity and good stability after several cycles. However, the ...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/06B01J20/28B01J20/30
CPCB01J20/041B01J20/06B01J20/28016B01J20/28026Y02E60/10
Inventor 胡羽张竞择宝鲁日汤卫平
Owner LIS MATERIALS TECH CO LTD
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