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Precursor solution and preparation method thereof, positive electrode material and lithium ion battery

A technology of precursor solution and lithium-ion battery, applied in battery electrodes, secondary batteries, battery recycling, etc., can solve the problem of low loss rate of nickel and/or cobalt and/or manganese ions, long impurity removal process, and waste water discharge Large volume and other problems, to achieve the effect of low loss rate, strong operability, and environmental protection

Active Publication Date: 2022-01-11
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first object of the present invention is to provide a method for preparing a precursor solution, by adopting a neutralization precipitation method to remove impurities in two steps, and using carbonate and lye as neutralizing agents to adjust the mixed material to a specific pH, The deep impurity removal of iron, aluminum and copper ions is realized, the process flow is simple, the operability is strong, the production cost is low, and the loss rate of nickel and / or cobalt and / or manganese ions is low during the impurity removal process, It solves the problems of long impurity removal process, high cost, large waste water discharge and serious loss of Ni, Co and Mn in the impurity removal process in the prior art.

Method used

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  • Precursor solution and preparation method thereof, positive electrode material and lithium ion battery
  • Precursor solution and preparation method thereof, positive electrode material and lithium ion battery
  • Precursor solution and preparation method thereof, positive electrode material and lithium ion battery

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Embodiment 1

[0081] The preparation method of the precursor solution provided in this embodiment is as follows: figure 2 As shown, it specifically includes the following steps:

[0082] (a), the nickel-cobalt-manganese ternary cathode material LiNi x co y mn z o 2 Acid leaching treatment is carried out by reducing acid leaching method, using concentrated sulfuric acid as acid solution, H 2 o 2 As a reducing agent, leachate is obtained after filtration;

[0083] (b) Take 500mL of the above leaching solution, and slowly add 20% MnCO into it 3 Solution, adjust the pH of the mixed material to 5, react at 55°C for 1 hour, remove iron, aluminum, and copper in the solution, and separate the solid and liquid after the reaction to obtain 498mL of the first solution.

[0084] (c), take 250mL of the first solution and 1.84g Al 2 (SO 4 ) 3 ∙18H 2 O mixed, where Al 2 (SO 4 ) 3 ∙18H 2 The molar ratio of the aluminum element in O to the fluorine element in the first solution is 4:1, carry...

Embodiment 2

[0091] The preparation method of the precursor solution provided in this embodiment comprises the following steps:

[0092] (a), the nickel-cobalt-manganese ternary cathode material LiNix co y mn z o 2 The acid leaching treatment is carried out by roasting reduction acid leaching method. First, the nickel-cobalt-manganese ternary positive electrode material is subjected to carbothermal reduction roasting to obtain the roasted material; then concentrated hydrochloric acid is used as the acid solution, and H 2 o 2 As a reducing agent, leachate is obtained after filtration;

[0093] (b) Take 500mL of the above leaching solution, and slowly add NiCO with a mass fraction of 10% into it 3 Solution, adjust the pH of the mixed material to 4.5, react at 60°C for 0.5h, initially remove iron, aluminum, and copper in the solution, and separate the solid and liquid after the reaction to obtain 502mL of the first solution.

[0094] (c), take 250mL of the first solution and 0.43g AlCl ...

Embodiment 3

[0101] The preparation method of the precursor solution provided in this embodiment comprises the following steps:

[0102] (a) The waste lithium cobalt oxide positive electrode material is subjected to acid leaching treatment by roasting reduction acid leaching method. First, the nickel-cobalt-manganese ternary positive electrode material is hydrogen-reduced and roasted to obtain the roasted material; then concentrated hydrochloric acid is used as the acid solution, H 2 o 2 As a reducing agent, leachate is obtained after filtration;

[0103] (b) Take 500mL of the above leaching solution, and slowly add 30% CoCO 3 Solution, adjust the pH of the mixed material to 5.5, react at 40°C for 2 hours, initially remove iron, aluminum, and copper in the solution, and separate the solid and liquid after the reaction to obtain 508mL of the first solution.

[0104] (c), take 250mL of the first solution and 1.38g of AlCl 3 mixed, where AlCl 3 The molar ratio of the aluminum element in t...

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Abstract

The invention relates to the field of lithium ion battery recycling and regeneration, in particular to a precursor solution and a preparation method thereof, a positive electrode material and a lithium ion battery. The preparation method of the precursor solution comprises the steps of carrying out acid leaching treatment on the positive electrode material of the waste lithium ion battery, and carrying out solid-liquid separation to obtain pickle liquor; then mixing the pickle liquor with carbonate, carrying out solid-liquid separation after reaction, and preliminarily removing iron, aluminum and copper in the solution to obtain a first solution; and defluorinating the first solution, mixing the first solution with alkali liquor, performing solid-liquid separation after reaction, and removing iron, aluminum and copper in the solution again to obtain a precursor solution. According to the invention, two-step impurity removal is performed by adopting a neutralization precipitation method, the carbonate and the alkali liquor are respectively adopted as neutralizers to adjust the mixed material to a specific pH value, deep impurity removal of iron, aluminum and copper ions is realized, the process is simple, the operability is high, the production cost is low, and the loss rate of nickel and / or cobalt and / or manganese ions in the impurity removal process is low.

Description

technical field [0001] The invention relates to the field of recovery and regeneration of lithium-ion batteries, in particular to a precursor solution and a preparation method thereof, a positive electrode material and a lithium-ion battery. Background technique [0002] With the increasing market share of new energy vehicles, power batteries are one of the core components of new energy vehicles, and the amount of waste power batteries will also increase. Waste power batteries contain a large amount of valuable metals, among which the contents of Ni, Co, Mn and Li can reach 5-12%, 5-20%, 7-10% and 2-5% respectively. The recycling of waste power batteries can not only improve the self-sufficiency rate of raw materials, but also reduce the impact on the environment. [0003] Ni, Co, and Mn are recovered from the positive electrode materials of waste lithium batteries, and most of them are enriched by acid leaching into the acid leaching solution, and then the impurities are r...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M4/505H01M4/525H01M10/0525C22B7/00C22B23/00C22B47/00
CPCH01M10/54H01M4/505H01M4/525H01M10/0525C22B7/007C22B23/0415C22B23/0461C22B47/00Y02E60/10Y02P10/20Y02W30/84
Inventor 王海北邓超群李诗丽李强周起帆秦树辰
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD