Method for recycling battery-grade iron phosphate in lithium iron phosphate battery and preparing lithium iron phosphate positive material by utilizing waste lithium ion phosphate battery
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A technology of lithium iron phosphate battery and lithium iron phosphate, which is applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the problems of low purity of elements or substances, re-preparation of battery positive electrode materials, etc., and achieve good dispersion, Improve the use value, the effect of good reversibility
Active Publication Date: 2015-09-30
HARBIN INST OF TECH
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[0004] The present invention is to solve the current problem of reclaiming LiFePO 4 The element or substance obtained by the positive electrode method of lithium ion battery has low purity and cannot be used to prepare LiFePO again. 4 In view of the prob
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specific Embodiment approach 1
[0030] Specific embodiment one: the method for reclaiming battery-grade iron phosphate in the lithium iron phosphate battery of this embodiment is carried out according to the following steps:
[0031] 1. Remove the residual electricity in the waste lithium iron phosphate battery, take out the battery cell to separate the positive electrode, negative electrode and diaphragm, crush the positive electrode sheet, then perform heat treatment, and then oscillate and sieve, get pure aluminum on the sieve, and get it under the sieve mixed powder;
[0032] 2. Dissolve the mixed powder obtained under the sieve in step 1 with an acid solution;
[0033] Three, add tensio-active agent in the acid solution of step 2;
[0034] 4. Add lye to the solution added with surfactant in step 3 to adjust the pH value to 2, then filter, wash and dry the precipitate to obtain battery-grade iron phosphate.
[0035] In the first step of this embodiment, the heat treatment can remove the binder on the p...
specific Embodiment approach 2
[0037] Embodiment 2: The differences between this embodiment and Embodiment 1 are: in step 1, the heat treatment temperature is 450-500° C., and the heat treatment time is 1-2 hours. Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0038] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the acid solution in step 2 is 2-2.5 mol / L sulfuric acid solution or 2-2.5 mol / L hydrochloric acid solution. Other steps and parameters are the same as those in Embodiment 1 or 2.
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Abstract
The invention relates to a method for recycling battery-grade iron phosphate in a lithium iron phosphate battery and preparing a lithium iron phosphate positive material by utilizing a waste lithium ion phosphate battery, and relates to a method for recycling a battery and preparing the battery positive material by utilizing the waste battery recycled material, solving the problems of the traditional method for recycling the LiFePO4 lithium ion battery positive electrode that the purity of the obtained element or substances is low and the obtained element or substances cannot be used for preparing the LiFePO4 lithium ion battery positive electrode. The method comprises the steps: I, crushing a positive pole piece, and carrying out heat treatment; II, dissolving the crushed positive pole piece in an acid solution; III, charging a surface active agent; IV, charging an alkaline solution, thereby obtaining a battery-grade iron phosphate; V, charging sodium carbonate to obtain a lithium carbonate; VI, mixing iron phosphate, lithium carbonate and a carbon source reduction agent; and VII, calcining. In the process for recycling the battery-grade iron phosphate in the lithium iron phosphate battery and preparing the lithium iron phosphate positive material by utilizing the waste lithium iron phosphate battery, no secondary pollution is produced, and the comprehensive and high-added-value recycling of the waste lithium iron phosphate battery can be realized.
Description
technical field [0001] The invention relates to a battery recovery method and a method for preparing lithium iron phosphate cathode materials by using waste batteries. Background technique [0002] Lithium-ion batteries are widely used in various electronic devices due to their high operating voltage, high energy density, low self-discharge, long life, and no memory effect. Different from other types of chemical power systems, the positive and negative electrode materials of lithium-ion batteries are constantly developing. Taking the positive pole as an example, the first commercial lithium-ion batteries use layered LiCoO 2 , thereafter, using spinel LiMn 2 o 4 and layered LiNi1 / 3Co1 / 3Mn1 / 3O 2 Wait. Lithium-ion batteries are expanding from the traditional field of portable batteries to fields such as electric tools, electric bicycles, hybrid electric vehicles and pure electric vehicles. In the currently studied power lithium-ion battery system, LiFePO 4 Batteries are c...
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