Iron-manganese-based positive electrode material, and preparation method and application thereof

A positive electrode material, iron-manganese-based technology, applied in the field of iron-manganese-based positive electrode materials and their preparation, can solve the problems of poor cycle stability and achieve the effect of low lithium element, ensure cycle stability, and stable structure

Active Publication Date: 2021-08-20
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide an iron-manganese-based cathode material and its preparation method and application to solve the problem of poor cycle stability of iron-manganese-based cathode materials in the prior art

Method used

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  • Iron-manganese-based positive electrode material, and preparation method and application thereof
  • Iron-manganese-based positive electrode material, and preparation method and application thereof
  • Iron-manganese-based positive electrode material, and preparation method and application thereof

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preparation example Construction

[0026] According to a typical implementation of the present application, a method for preparing an iron-manganese-based positive electrode material is provided, the preparation method comprising: step S1, combining an inorganic compound of lithium and Fe x mn y (OH) 2 The precursor is oxidized and sintered to obtain an intermediate product, wherein, 0x mn y (OH) 2 The ratio of the total molar amounts of Fe and Mn in the precursor is 0.1:1 to 0.5:1; step S2, under the condition of nitrogen or the first inert gas atmosphere, the intermediate product is subjected to the second sintering to obtain the iron-manganese-based positive electrode material .

[0027] In the above-mentioned preparation method of the present application, the molar weight and Fe of Li in the inorganic compound of controlling lithium x mn y (OH) 2 The ratio of the total molar amount of Fe and Mn in the precursor is 0.1:1 to 0.5:1, that is, the amount of lithium used is much lower than that of iron and ...

Embodiment 1

[0041] 1) Mix 500g ferrous chloride, 500g manganese acetate and 2000mL water in the reactor, add 300g ammonia complexing agent to the reactor, feed nitrogen into the reactor at a speed of 3L / min, heat the reactor When the dispersion liquid reaches 45°C, add sodium hydroxide solution to the reaction kettle to adjust the pH of the dispersion liquid to 12, and stir the dispersion liquid at 300rpm to carry out coprecipitation reaction. washed, and dried in an oven at 100 °C to obtain Fe 0.5 mn 0.5 (OH) 2 Precursor.

[0042] 2) In a dry environment, 100gFe 0.5 mn 0.5 (OH) 2 Precursor and 4.7g lithium hydroxide (n Li :( Fe +n Mn )=0.1) ball milling until uniform.

[0043] 3) Put the uniformly mixed material in a Nabertherm box furnace, feed pure oxygen into the box furnace at a flow rate of 2L / min, and heat it up to 600°C at a rate of 2°C / min, then keep it warm for 5h , to obtain intermediate products.

[0044] 4) Stop feeding pure oxygen into the box-type furnace, and fe...

Embodiment 2

[0046] The difference with Example 1 is that in step 2) 100gFe 0.5 mn 0.5 (OH) 2 Precursor and 14.1g lithium hydroxide (n Li :( Fe +n Mn )=0.3) to carry out ball milling and mix until uniform, after step 4), finally obtain Li 0.3 Fe 0.5 mn 0.5o 2 Fe-Mn based cathode material.

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Abstract

The invention provides an iron-manganese-based positive electrode material, and a preparation method and an application thereof. The preparation method comprises the steps that S1, an inorganic compound of lithium and a FexMny (OH) 2 precursor are subjected to oxidation sintering, an intermediate product is obtained, x is larger than 0 and smaller than 1.0, y is larger than 0 and smaller than 1.0, x + y = 1, and the ratio of the molar weight of Li in the inorganic compound of lithium to the total molar weight of Fe and Mn in the FexMny (OH) 2 precursor ranges from 0.1: 1 to 0.5: 1; and S2, second sintering is performed on the intermediate product in a nitrogen or first inert gas atmosphere condition to obtain the iron-manganese-based positive electrode material. The iron-manganese-based positive electrode material obtained by the preparation method disclosed by the invention is relatively low in lithium element content and relatively stable in structure so that the original structure of the iron-manganese-based positive electrode material is not influenced in the embedding and separating processes of lithium ions between a positive electrode and an electrolyte, and the cycling stability of the lithium ion battery is further ensured.

Description

technical field [0001] The invention relates to the field of lithium-ion cathode batteries, in particular to an iron-manganese-based cathode material and a preparation method and application thereof. Background technique [0002] With the increasingly prominent problems of energy crisis and environmental pollution, the development and utilization of new energy is imperative. In the next few years, the application demand of lithium-ion batteries in the new energy vehicle industry will continue to increase. [0003] In new energy vehicles, lithium-ion batteries occupy a core position, and in lithium-ion batteries, cathode materials are the most important. Taking the NCM523 power battery as an example, the positive electrode material accounts for as much as 32% of the cost, while the electrolyte, separator and negative electrode account for only about 25%. In addition to the cost factor, the electrochemical performance of the cathode material is also closely related to the ov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/131H01M4/1391H01M4/505H01M4/525
CPCH01M4/0471H01M4/1391H01M4/505H01M4/525H01M4/131H01M2004/028Y02E60/10
Inventor 陈思贤江卫军许鑫培郑晓醒
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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