Lithium ion battery electrolytic solution treatment method

Abstract

The invention provides a lithium ion battery electrolytic solution treatment method, which comprises: (1) preparing a calcium hydroxide solution; (2) adding an acid solution into a lithium ion batteryelectrolytic solution, and carrying out hydrolysis treatment to obtain a hydrolysis solution; (3) adding a calcium hydroxide solution into the hydrolysis solution in a dropwise manner, and stirring to generate waste gas and a solid-liquid mixture; and (4) carrying out absorption treatment and separation treatment on the waste gas, and carrying out flocculation precipitation treatment and separation treatment on the solid-liquid mixture. According to the invention, with the method, the acid solution is added to carry out hydrolysis treatment, the calcium hydroxide solution is added into the hydrolysis solution in a dropwise manner to carry out flocculation precipitation treatment and the like, so that the fluorine content in the liquid phase is reduced; and the fluorine content in the separated liquid phase is smaller than 10 ppm through close fit interaction of the steps (2), (3) and (4).

Description

technical field

[0001] The invention relates to the technical field of cleaning and processing the electrolyte of lithium ion batteries, in particular to a method for processing the electrolyte of lithium ion batteries. Background technique

[0002] Lithium-ion batteries have been widely used in notebook computers, mobile phones, camcorders, power batteries and energy storage batteries due to their high energy density and long service life. There are also more and more scrapped lithium-ion batteries. The scrapped lithium-ion batteries contain electrolytes. Lithium-ion electrolytes contain fluoride (LiFP 6 ) organic solution, lithium hexafluorophosphate will decompose hydrogen fluoride when it meets water or heat, the toxicity of hydrogen fluoride to plants is 20-300 times greater than that of sulfur dioxide, and hydrogen fluoride can be transferred and accumulated in plants after being absorbed by plants, and can enter animals through the food chain and cause fluorosis in h...

Examples

Embodiment 1

[0029] A lithium-ion battery electrolyte treatment method, comprising the steps of:

[0030] (1) prepare calcium hydroxide solution;

[0031] (2) adding the acid solution to the lithium-ion battery electrolyte for hydrolysis treatment to obtain a hydrolyzate;

[0032] (3) adding calcium hydroxide solution dropwise to the hydrolyzate and stirring to generate waste gas and solid-liquid mixture;

[0033] (4) Absorb and separate the waste gas, and flocculate and separate the solid-liquid mixture.

Embodiment 2

[0035] A lithium-ion battery electrolyte treatment method, comprising the steps of:

[0036] (1) prepare calcium hydroxide solution, wherein, by mass, calcium hydroxide: water=1:10;

[0037] (2) Add 1mol / L hydrochloric acid to lithium ion battery electrolyte and carry out hydrolysis treatment to obtain hydrolyzate, wherein, hydrochloric acid: lithium ion battery electrolyte=0.05:1;

[0038] (3) At 25°C, add calcium hydroxide solution dropwise to the hydrolyzed solution and stir to generate waste gas and solid-liquid mixture, wherein, lithium hexafluorophosphate: calcium hydroxide = 1:1.5;

[0039] (4) Carry out absorption treatment, sedimentation treatment and separation treatment on exhaust gas, carry out flocculation precipitation treatment and separation treatment on solid-liquid mixture, choose calcium hydroxide solution for absorption treatment, water in calcium hydroxide solution: calcium hydroxide=10:1 , Alum is selected as the flocculant.

Embodiment 3

[0041] A lithium-ion battery electrolyte treatment method, comprising the steps of:

[0042] (1) prepare calcium hydroxide solution, wherein, by mass, calcium hydroxide: water=1:20;

[0043] (2) Add 1mol / L hydrochloric acid to lithium ion battery electrolyte and carry out hydrolysis treatment to obtain hydrolyzate, wherein, hydrochloric acid: lithium ion battery electrolyte=0.1:1;

[0044] (3) At 30°C, add calcium hydroxide solution dropwise to the hydrolyzed solution and stir to generate waste gas and solid-liquid mixture, wherein, lithium hexafluorophosphate: calcium hydroxide = 1:2;

[0045] (4) Carry out absorption treatment, sedimentation treatment and separation treatment on exhaust gas, carry out flocculation precipitation treatment and separation treatment on solid-liquid mixture, choose calcium hydroxide solution for absorption treatment, water in calcium hydroxide solution: calcium hydroxide=14:1 , The flocculant is ferric chloride.

technical field

[0001] The invention relates to the technical field of cleaning and processing the electrolyte of lithium ion batteries, in particular to a method for processing the electrolyte of lithium ion batteries. Background technique

[0002] Lithium-ion batteries have been widely used in notebook computers, mobile phones, camcorders, power batteries and energy storage batteries due to their high energy density and long service life. There are also more and more scrapped lithium-ion batteries. The scrapped lithium-ion batteries contain electrolytes. Lithium-ion electrolytes contain fluoride (LiFP 6 ) organic solution, lithium hexafluorophosphate will decompose hydrogen fluoride when it meets water or heat, the toxicity of hydrogen fluoride to plants is 20-300 times greater than that of sulfur dioxide, and hydrogen fluoride can be transferred and accumulated in plants after being absorbed by plants, and can enter animals through the food chain and cause fluorosis in h...

Examples

Embodiment 1

[0029] A lithium-ion battery electrolyte treatment method, comprising the steps of:

[0030] (1) prepare calcium hydroxide solution;

[0031] (2) adding the acid solution to the lithium-ion battery electrolyte for hydrolysis treatment to obtain a hydrolyzate;

[0032] (3) adding calcium hydroxide solution dropwise to the hydrolyzate and stirring to generate waste gas and solid-liquid mixture;

[0033] (4) Absorb and separate the waste gas, and flocculate and separate the solid-liquid mixture.

Embodiment 2

[0035] A lithium-ion battery electrolyte treatment method, comprising the steps of:

[0036] (1) prepare calcium hydroxide solution, wherein, by mass, calcium hydroxide: water=1:10;

[0037] (2) Add 1mol / L hydrochloric acid to lithium ion battery electrolyte and carry out hydrolysis treatment to obtain hydrolyzate, wherein, hydrochloric acid: lithium ion battery electrolyte=0.05:1;

[0038] (3) At 25°C, add calcium hydroxide solution dropwise to the hydrolyzed solution and stir to generate waste gas and solid-liquid mixture, wherein, lithium hexafluorophosphate: calcium hydroxide = 1:1.5;

[0039] (4) Carry out absorption treatment, sedimentation treatment and separation treatment on exhaust gas, carry out flocculation precipitation treatment and separation treatment on solid-liquid mixture, choose calcium hydroxide solution for absorption treatment, water in calcium hydroxide solution: calcium hydroxide=10:1 , Alum is selected as the flocculant.

Embodiment 3

[0041] A lithium-ion battery electrolyte treatment method, comprising the steps of:

[0042] (1) prepare calcium hydroxide solution, wherein, by mass, calcium hydroxide: water=1:20;

[0043] (2) Add 1mol / L hydrochloric acid to lithium ion battery electrolyte and carry out hydrolysis treatment to obtain hydrolyzate, wherein, hydrochloric acid: lithium ion battery electrolyte=0.1:1;

[0044] (3) At 30°C, add calcium hydroxide solution dropwise to the hydrolyzed solution and stir to generate waste gas and solid-liquid mixture, wherein, lithium hexafluorophosphate: calcium hydroxide = 1:2;

[0045] (4) Carry out absorption treatment, sedimentation treatment and separation treatment on exhaust gas, carry out flocculation precipitation treatment and separation treatment on solid-liquid mixture, choose calcium hydroxide solution for absorption treatment, water in calcium hydroxide solution: calcium hydroxide=14:1 , The flocculant is ferric chloride.

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