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Method for preparing cathode material of lithium ion battery from mixed waste alkaline batteries

A lithium-ion battery and positive electrode material technology, which is applied in the field of solid waste recycling, can solve the problems of limiting the recycling efficiency of mixed waste batteries of various types, achieve superior performance and save raw material costs

Inactive Publication Date: 2015-11-18
HENAN INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, due to the different components contained in different batteries, waste battery recycling at home and abroad often only treats a single type of waste battery. The singleness of the treatment process severely limits the recovery efficiency of mixed waste batteries of various types.

Method used

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  • Method for preparing cathode material of lithium ion battery from mixed waste alkaline batteries
  • Method for preparing cathode material of lithium ion battery from mixed waste alkaline batteries
  • Method for preparing cathode material of lithium ion battery from mixed waste alkaline batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Optimization of dissolution conditions for mixed spent alkaline batteries.

[0018] For waste lithium-ion batteries, first connect the positive and negative electrodes with wires to make them self-discharge, so as to prevent discharge or spontaneous combustion during manual disassembly. The positive electrode material containing aluminum foil is then separated. When optimizing the separation conditions of the cathode material and aluminum foil, water, carbon tetrachloride, dichloromethane, and NMP were selected as ultrasonic solvents. The results showed that no matter what type and brand of lithium cobaltate cathode material, NMP was used as the ultrasonic solvent. Ultrasound for 3 minutes can completely separate the positive electrode material and aluminum foil. Filter and dry. The positive electrode active material of the lithium ion battery can be obtained. For the spent alkaline zinc-manganese battery, use a hacksaw to saw from the battery collector, and manually...

Embodiment 2

[0020] Preparation of LiNi under different pH conditions 1 / 3 co 1 / 3 mn 1 / 3 o 2 IR of cathode material picture Spectrum.

[0021] When different gelling agents or precipitating agents are used to form gels, their polarity, polar moment and access to active ions are different. There will be different effects on the exchange reaction in the sol. When only water is used as a solvent, the precursor does not contain active substances that can undergo polycondensation reactions, and the cross-linking between the products is only through heating, stirring and evaporating the solvent, so that the products can be connected by hydrogen bonds to form a gel. When absolute ethanol or ethylene glycol is used as a solvent, adding citric acid as a gelling agent can form a gel. The reason for the formation of the gel is that the citric acid and the solvent undergo a strong polymerization reaction and quickly form a continuous three-dimensional network. structure. In this experiment, wat...

Embodiment 3

[0023] Effect of different calcination temperatures on LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The influence of cathode material preparation.

[0024] Depend on image 3 It can be seen that the XRD in the case of a, b, and d calcined picture There are miscellaneous peaks in the spectra, but c has better crystallinity in the case of calcination; this result shows that the calcination temperature gradually increases, and the crystal grains are gradually formed, but when the calcination temperature is too high, micropore shrinkage may occur and agglomeration occurs. If the calcination temperature is too low, the precursor may not be completely decomposed. On the whole, the crystallinity is strong at 850°C, and there is no impurity peak.

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Abstract

A method for preparing a cathode material of a lithium ion battery from mixed waste alkaline batteries comprises the following steps of: using cathode materials of waste alkaline zinc-manganese batteries and cathode materials of waste lithium ion batteries as raw materials, dissolving the cathode materials with nitric acid with a certain concentration, and adding corresponding nitrate into a dissolution liquid to regulate proportions of metal cobalt, nickel and manganese ions; taking sodium hydroxide as a precipitant, preparing a nickel-cobalt-manganese hydroxide precursor by a co-precipitation method, carrying out filtering and drying, mixing the precursor with a certain amount of lithium carbonate, and placing the mixture in a muffle furnace for calcination to obtain a ternary cathode material LiNi<1 / 3>Co<1 / 3>Mn<1 / 3>O2. Morphology and structural characterization of an obtained product are carried out by means of a spectrograph, an X-ray diffractometer, a scanning electron microscope and an energy disperse spectroscopy, the product is used to produce a button cell, and characterization is carried out on the electrochemical performance of the button cell by means of a LAND tester. A result shows that the initial discharging capacity of the prepared new battery is 158.3mAHg<-1> when pH is controlled to be 8, the calcination temperature is 850 DEG C and the calcination time is 10 hours during the precipitation reaction. According to the research, various models of waste alkaline batteries can be simultaneously recycled, the production cost of the battery cathode material is reduced, and the method has high economical and social benefits.

Description

technical field [0001] The invention belongs to the technical field of recycling solid waste, and in particular relates to a method for preparing positive electrode materials of lithium-ion batteries by using mixed waste alkaline batteries. Background technique [0002] In recent years, lithium-ion batteries have been widely used in various digital products, and will also have broad application prospects in the fields of electric vehicles and energy storage batteries in the future. In order to meet people's increasing demand for secondary batteries with high energy ratio and long cycle life, the preparation of cathode materials with superior performance, safety and low price has become the key to the commercialization of lithium-ion batteries. [0003] Since the cathode material of lithium ion battery is the key material to determine the performance of lithium ion battery, its performance will directly affect the discharge efficiency of the battery. For Ni-Co-Mn ternary com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 杨理孔德川马金友王新生肖香珍苏晓
Owner HENAN INST OF SCI & TECH
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