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Method and applications thereof for recovering MnO* from anode material of wasted lithium manganate battery

A battery cathode, old lithium manganate technology, applied in the field of waste material recycling, can solve problems such as high cost, complex recycling process, complex electrode material composition, etc., to save energy, avoid secondary pollution, and avoid high-temperature calcination processes. Effect

Inactive Publication Date: 2009-09-23
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the used LiMn 2 o 4 The composition of the electrode material is relatively complex, it is difficult to obtain a higher purity recycled product, the recycling process is complicated, and the cost is high

Method used

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  • Method and applications thereof for recovering MnO* from anode material of wasted lithium manganate battery
  • Method and applications thereof for recovering MnO* from anode material of wasted lithium manganate battery
  • Method and applications thereof for recovering MnO* from anode material of wasted lithium manganate battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 50g of the positive electrode sheet of the spent lithium manganese oxide battery, and dissolve the aluminum foil of the positive electrode current collector with 100mL of 1-10mol / L NaOH solution. Among them, aluminum is represented by NaAlO 2 The form enters the solution to be recovered, and the positive electrode active material falls off naturally and becomes alkali leaching residue. Wash the alkali leaching residue repeatedly with distilled water until the washing liquid is neutral, and use 100mL N-methylpyrrolidone (NMP) to wash the above-mentioned alkali leaching residue 3 to 4 times to remove the binder polyvinylidene fluoride (PVDF ). After the above pretreatment, the positive electrode active material contains LiMn 2 o 4 Waste cathode materials and activated carbon. The active substance washed with NMP is repeatedly washed with distilled water for 4-5 times, dried and ground for later use.

Embodiment 2

[0042] Preparation of MnO from the positive electrode active material recovered after the above pretreatment 2 . Weigh 9.77g of positive electrode active material, place in 100mL of 0.25-5mol / L H 2 SO 4 In the solution, under the action of magnetic stirring, react at room temperature (25°C) and normal pressure for 1-10 hours, and the suspension appears dark red. The acid leaching residue was separated by suction filtration from the suspension, washed with distilled water, and dried at 100°C for use. The XRD pattern of the material obtained by atmospheric acid leaching is shown in figure 1 After analysis, the product has a similar crystal structure to the lithium manganate cathode material in the original waste battery, which is the cubic λ-MnO 2 . figure 2 It is a TEM photo of the material, it can be seen that after acid leaching at atmospheric pressure, the prepared λ-MnO 2 The particle size is about 200-300nm.

Embodiment 3

[0044] Add 9.77g of the positive electrode active material recovered after pretreatment to 40mL of 1.5-10mol / L H 2 SO 4 In the solution, stir it with a glass rod to make it fully mixed, then place it in a high-pressure reactor, and carry out a hydrothermal reaction at 100-200°C and a pressure of 0.5-10Mpa for 1-60h. The obtained precipitate was separated by centrifugation, washed with water until neutral, and dried at 100°C for future use. image 3 The XRD patterns of each product were obtained for hydrothermal acid leaching at different times. It can be seen from the figure that when the acid leaching time is 1.5-3h, the product is orthorhombic γ-MnO 2 ( image 3 a); With the prolongation of acid leaching time, to 6-24h, the product is tetragonal α-MnO 2 ( image 3 b); as the acid leaching time is further extended to 30-60h, the product is tetragonal β-MnO 2 ( image 3 c). Figure 4 For the prepared three crystal forms of MnO 2 TEM photographs. from Figure 4 It ca...

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Abstract

A method for recovering MnO2 from the anode material of a wasted lithium manganate oxide battery comprises the following steps of firstly obtaining an anode active material by pre-disposing assembled anode sheets with alkaline solution, etc., subsequently taking the anode active material as a raw material and obtaining a Lambda-MnO2 by soaking the raw material in an inorganic acid or a normal-pressure acid, or obtaining an Alpha- / Beta- / Gama-MnO2 by soaking the raw material in a hydrothermal acid. The method has simple process, little used acid and convenient separation and purification; the obtained various crystal-type MnO2 with large specific surface area and porous structure can be applied directly to be as a catalyst for synthesizing ester compound or disposable battery anode material of Li / MnO2 or electrode material of a super-capacitor.

Description

1. Technical field [0001] The invention relates to a method for recycling waste materials, specifically a method for recovering MnO from the positive electrode material of waste lithium manganate batteries. 2 method and its application. 2. Background technology [0002] With the increasing demand for energy in human society, batteries, as a portable energy storage device, play an increasingly important role in society and people's daily life. Especially after entering the 21st century, the market for portable electronic devices such as mobile phones, notebook computers, digital cameras, and MP3 players has shown explosive growth, and the demand for rechargeable batteries (mainly lithium-ion batteries) has risen sharply. According to the information provided by the China Chemical and Physical Power Industry Association, China has now developed into the world's largest battery manufacturer and consumer. In 2007, the output of lithium-ion batteries in mainland China exceeded ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B47/00
CPCY02E60/12Y02P10/20Y02W30/84
Inventor 杨则恒张卫新马世闯周晨旭王强
Owner HEFEI UNIV OF TECH
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