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Recovery method of lithium ion battery anode material waste slurry

A technology for lithium ion batteries and cathode materials, which is applied in the field of effectively recycling cathode material waste slurry of lithium ion batteries, can solve problems such as affecting the quality of finished batteries, battery short circuits, environmental pollution, etc., and achieves easy implementation, resource saving, and convenient operation. Effect

Inactive Publication Date: 2008-06-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resources of metal elements used in the slurry are limited, and as a waste material, if it is not handled properly, it may cause environmental pollution; if the agglomerated waste slurry is directly used to pull the pole piece, the thick and hard waste slurry particles may puncture the diaphragm ( When winding the battery core) or under the action of the roll (when the pole piece is drawn) the pole piece is punctured, causing a short circuit inside the battery, which seriously affects the quality of the finished battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 2 kg of lithium cobaltate agglomeration waste slurry with a water content of 10% and pour it into a 10-liter tank with agitation, inject 1000 grams of NMP into it, heat it to 120 ° C with an oil bath, and stir for 1 hour; the obtained solid-liquid mixture enters the distillation device, carry out atmospheric distillation in the distillation device, and distill at 200°C (the boiling temperature of the solid-liquid mixture at normal pressure) until the mass ratio of liquid to solid is 0.4 (taking a sample of the solid-liquid mixture for testing to obtain the liquid and solid mass ratio). The solid-liquid mixture after distillation was cooled to room temperature, and its viscosity was measured to be 7000cp. The distilled solid-liquid mixture can be directly used as slurry for electrode sheet drawing in battery manufacturing.

Embodiment 2

[0022] Take 2 kilograms of lithium cobaltate agglomeration waste slurry with a water content of 5% and pour it into a 10-liter tank with stirring, inject 700 grams of NMP into it, heat it to 120 ° C with an oil bath, and stir for 1 hour; Pressure distillation device, carry out vacuum distillation in this vacuum distillation device, the pressure is -0.08MPa, 132 ℃ (the boiling temperature of this solid-liquid mixture at -0.08MPa) is distilled to liquid and solid mass ratio is 0.37 (take The solid-liquid mixture sample is tested to obtain the liquid to solid mass ratio), cooled to room temperature, and the measured viscosity is 5000cp. The distilled solid-liquid mixture can be directly used as slurry for electrode sheet drawing in battery manufacturing.

Embodiment 3

[0024] Take 2 kilograms of lithium cobaltate agglomeration waste slurry with a water content of 5% and pour it into a 10-liter tank with stirring, inject 700 grams of NMP into it, heat it to 120 ° C with an oil bath, and stir for 1 hour; Pressure distillation device, carry out vacuum distillation in this vacuum distillation device, the pressure is -0.1MPa, under 81.5 ℃ (the boiling temperature of this solid-liquid mixture at -0.1MPa), distill to liquid and solid mass ratio is 0.37 (take The solid-liquid mixture sample was tested to obtain the liquid to solid mass ratio), cooled to room temperature and the measured viscosity was 7400cp. The distilled solid-liquid mixture can be directly used as slurry for electrode sheet drawing in battery manufacturing.

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Abstract

The invention provides a method for recycling waste slurry of lithium ion battery anode material, which comprises the following steps: (1) the waste slurry of the lithium ion battery anode material is mixed with N-methyl-2-pyrrolidone; (2) mixture obtained by the step (1) is distilled.The method of the invention mixes solvent NMP which is used for preparing the slurry in production with the material waste slurry of the lithium ion battery, distills the waste slurry and removes moisture. New components are not introduced in the treatment process; after being treated by the method of the invention, the waste slurry can be directly used for battery electrode flake pasting.The method of the invention has simple steps and convenient operation which can be easily carried out, and is extremely in favor of resource saving, environment protection and reduce the cost for manufacturing battery.

Description

【Technical field】 [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a method for effectively recovering waste slurry of the positive electrode material of a lithium ion battery. 【Background technique】 [0002] During the battery manufacturing process, due to improper operation or long-term exposure to air, the slurry may agglomerate after absorbing water and become waste slurry. For the agglomerated waste slurry, it is generally sold as waste material in production practice, or directly reused for pole piece drawing. The resources of metal elements used in the slurry are limited, and as a waste material, if it is not handled properly, it may cause environmental pollution; if the agglomerated waste slurry is directly used to pull the pole piece, the thick and hard waste slurry particles may puncture the diaphragm ( When winding the battery core) or under the action of the roll (when the pole piece is drawn), the pole pie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/04
Inventor 熊德宇先雪峰刘会权
Owner BYD CO LTD