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Method for recovering anode material of waste lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in the field of cathode material recovery of waste lithium ion batteries, can solve the problems of high recovery value, high recovery cost, large consumption of reagents, etc., achieves recovery and regeneration of valuable resources, and is conducive to popularization and popularization. , to achieve the effect of environmental protection

Inactive Publication Date: 2019-04-26
YUNNAN NENGTOU HUILONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] With the wide application of lithium iron phosphate, lithium vanadium phosphate, lithium-rich manganese and nickel-cobalt lithium manganese oxide materials in battery cathode materials, the recovery of waste battery cathode materials has become an important task, because it contains precious metals such as cobalt and nickel. , so its recovery value is relatively high; how to realize the separate separation of lithium iron phosphate, lithium vanadium phosphate, lithium-rich manganese base and nickel-cobalt lithium manganese oxide materials is a research hotspot in the recycling of waste lithium battery cathode materials; the prior art battery cathode Material recycling has problems such as long process flow, large reagent consumption, high energy consumption and high recycling cost; it is also prone to secondary pollution

Method used

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  • Method for recovering anode material of waste lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The recovery of waste lithium iron acid, lithium vanadium phosphate, and lithium-rich manganese-based positive electrode materials includes the following steps:

[0059] Carry out performance evaluation on the waste lithium-ion battery, after the evaluation is completed, perform discharge treatment and disassemble the battery cell to obtain the positive plate;

[0060] Put the positive electrode sheet into a liquid nitrogen freezer for crushing, soak it in organic solvent NMP, stir and ultrasonically treat it, and separate the positive electrode active material from the current collector after screening and washing;

[0061] After drying the positive electrode active material, it is calcined at a high temperature in a muffle furnace, and the sample is ground after calcining;

[0062] Mix and stir the organic acid and water to react and filter; enrich the filtrate to obtain a high-concentration lithium-containing solution and then recover the lithium in the positive elec...

Embodiment 2

[0064] Adopt the method of the present invention to reclaim the cathode material of waste lithium ion battery, comprise the following steps:

[0065] Disassemble the cell to get the positive plate

[0066] Carry out performance evaluation on the waste ternary lithium-ion battery, after the evaluation is completed, perform discharge treatment and disassemble the battery cell to obtain the positive plate;

[0067] The performance of the lithium-ion battery is evaluated by using the old lithium-ion power battery with no damage to the outer shell and keeping the shape of the entire single battery intact;

[0068] The remaining capacity of the selected power battery is lower than 80% of the standard battery capacity, and the internal resistance is larger than that of the new battery, showing extremely poor inconsistency, unable to meet the high performance requirements, and can no longer be used in waste power batteries in electric vehicles;

[0069] The battery cell is disassembl...

Embodiment 3

[0087] Determination of Optimum Parameters for Immersion Separation of Organic Solvent NMP

[0088] Put the positive electrode sheet into liquid nitrogen to freeze and cut it into a square with a side length of 0.5-1cm, and soak it in NMP, an organic solvent with different liquid-material ratios, for different times;

[0089] It is stirred and ultrasonically treated, and the time of ultrasonic treatment is set at different times for testing; after screening and washing, the positive electrode active material is separated from the current collector;

[0090] After experimenting with ultrasound at 50-60°C for 1 hour, the positive active material was separated from the current collector after sieving and washing;

[0091] The liquid-to-material ratio of the organic solvent NMP and the positive electrode sheet is 8-10:0.8-1;

[0092] The positive active material is separated from the current collector after being sieved and washed by ultrasonication for 1 hour at 60°C;

[0093] ...

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Abstract

The invention discloses a method for recovering an anode material of a waste lithium ion battery, and relates to the technical field of battery anode materials. The method comprises disassembling a waste lithium ion battery cell to obtain an anode piece; placing the anode piece in a liquid nitrogen freezing crusher for crushing, adopting an organic solvent NMP for immersion, stirring and conducting ultrasonic treatment to make an anode active substance break away from a current collector; drying the anode active material and calcining the substance in a muffle furnace at high temperature, andgrinding a sample after calcination; dissolving, recycling and grinding a treated sample material with organic acid and a hydrogen peroxide system, and conducting sedimentation to obtain a recycled anode material precursor; adding a lithium source into the anode material precursor for mixed calcinations to obtain a recycled ternary anode material. According to the method, the defects of the existing recycling method are eliminated, regenerative valuable resources can be recycled to protect the environment, and the method has the advantages of low cost, simple process and easy industrial development.

Description

technical field [0001] The invention relates to the technical field of battery positive electrode materials, in particular to a method for recycling positive electrode materials of waste lithium ion batteries. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the 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. Lithium-based batteries are divided into lithium batteries and lithium-ion batteries. Lithium-ion batteries are used in mobile phones and laptops, commonly known as lithium batteries. Batteries generally use materials containi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C01B25/45C22B7/00C22B26/12
CPCC01B25/45C22B7/001C22B7/007C22B26/12H01M10/54Y02W30/84Y02P10/20
Inventor 杨成云
Owner YUNNAN NENGTOU HUILONG TECH
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