Method for double-effect molten salt low-temperature regeneration of waste lithium cobalt oxide positive electrode material

A cathode material, low-temperature regeneration technology, applied in chemical instruments and methods, cobalt compounds, battery electrodes, etc., can solve problems such as high energy consumption, high cost, non-compliance, etc.

Pending Publication Date: 2021-05-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Common recycling methods include wet leaching, high-temperature solidification, etc. These methods are prone to secondary pollution of acid or high energy consumption and high cost, which do not conform to the new concept of "green chemistry"

Method used

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  • Method for double-effect molten salt low-temperature regeneration of waste lithium cobalt oxide positive electrode material
  • Method for double-effect molten salt low-temperature regeneration of waste lithium cobalt oxide positive electrode material
  • Method for double-effect molten salt low-temperature regeneration of waste lithium cobalt oxide positive electrode material

Examples

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Effect test

Embodiment 1

[0027] A method for low-temperature regeneration of waste lithium cobaltate cathode material with double-effect molten salt, the specific steps are as follows:

[0028] (1) Preparation of a molten salt system: mixing three lithium salts lithium hydroxide, lithium nitrate and lithium acetate according to a mass ratio of 2:3:2.5 to obtain a molten salt system;

[0029] (2) Mix the molten salt system in step (1) with the positive electrode material of the waste lithium cobaltate battery according to the mass ratio of 2:1, manually grind the mixture for 20 minutes, and mix to obtain the mixture;

[0030] figure 1 It is the TG-DSC diagram of the molten salt system lithium hydroxide:lithium nitrate:lithium acetate=2:3:2.5 in this example. It can be seen from the figure that at 165°C, the lithium salt in the molten salt system is lithium ion In this embodiment, 165°C is selected as the regeneration temperature;

[0031] (3) Heat the mixture in step (2) to 165°C at 4°C / min and keep ...

Embodiment 2

[0033] A method for low-temperature regeneration of waste lithium cobaltate cathode material with double-effect molten salt, the specific steps are as follows:

[0034] (1) Preparation of molten salt system: three kinds of lithium salt lithium hydroxide, lithium nitrate and lithium acetate were mixed according to the mass ratio of 2:3:2.5 to obtain a molten salt system;

[0035] (2) Mix the molten salt system in step (1) with the positive electrode material of the waste lithium cobaltate battery according to the mass ratio of 2:1, manually grind the mixture for 20 minutes, and mix to obtain the mixture. The molten salt system is the same as that in Example 1. It can be observed from the DSC curve that the molten salt exists in a completely ionic state at 190°C. For a more complete reaction, 200°C is selected as the regeneration temperature in this example;

[0036] (3) Heat the mixture in step (2) to 200°C for 10 hours at 5°C / min in an air atmosphere. After the heat preservati...

Embodiment 3

[0042] A method for low-temperature regeneration of waste lithium cobaltate cathode material with double-effect molten salt, the specific steps are as follows:

[0043] (1) Preparation of a molten salt system: mixing three lithium salts lithium hydroxide, lithium nitrate and lithium acetate according to a mass ratio of 2:3:1 to obtain a molten salt system;

[0044](2) Mix the molten salt system in step (1) with the positive electrode material of the waste lithium cobaltate battery according to the mass ratio of 3:1, manually grind the mixture for 30 minutes, and mix to obtain the mixture;

[0045] Figure 6 It is the TG-DSC diagram of the molten salt system lithium hydroxide: lithium nitrate: lithium acetate=2:3:1 in this embodiment, it can be seen from the figure that the molten salt medium can reach the molten ionic state at 184.8°C, 184.8 °C can meet the reaction requirements, but it can be further observed from the DSC curve that the reaction ends at 208 °C. For a more co...

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Abstract

The invention discloses a method for double-effect molten salt low-temperature regeneration of a waste lithium cobalt oxide positive electrode material, which comprises the following steps: mixing a waste lithium cobalt oxide battery positive electrode material with a molten salt system, grinding the mixture, carrying out low-temperature sintering, washing the sintered product with water, and conducting drying to obtain a regenerated lithium cobalt oxide positive electrode material. The method does not need an acid leaching process, can avoid secondary environment pollution, and is environment-friendly; the method only needs to be carried out in a low-temperature environment, energy consumption is reduced, and cost is reduced; the waste lithium ion battery positive electrode material can be directly adopted as a raw material so as to achieve the resource recycling, the addition amount of the required lithium source does not need to be changed according to different waste degrees during the preparation process, and only the mixing according to the fixed ratio is needed, such that the molten salt system can meet the requirements of different lithium supplementing amounts, the reaction temperature can be reduced as a medium, regeneration is completed in one step, and the application range is wide.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for regenerating waste lithium cobalt oxide cathode materials at low temperature with double-effect molten salts. Background technique [0002] Lithium-ion battery is a rechargeable secondary battery that mainly relies on lithium ions to move between positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. In the Chinese market, lithium cobalt oxide is widely used due to its high energy density, high voltage and other advantages, but in the process of repeated charging and discharging, the irreversible conversion of lithium ions has become the main r...

Claims

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Application Information

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IPC IPC(8): C01G51/00H01M10/54H01M4/525H01M10/0525
CPCC01G51/42H01M10/54H01M4/525H01M10/0525C01P2004/03Y02W30/84Y02E60/10
Inventor 张英杰费子桐董鹏孟奇张雁南张义永段建国邹昱凌朱博文
Owner KUNMING UNIV OF SCI & TECH
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