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Lithium ion battery ferrous oxalate composite negative electrode material and preparation method thereof

A lithium-ion battery, ferrous oxalate technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of high irreversible capacity and poor cycle performance of metal oxalate negative materials, and improve reversible capacity and cycle performance. Stability, improved high rate and long cycle performance, improved electrochemical activity

Active Publication Date: 2020-05-19
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies of the above-mentioned technologies, the present invention solves the problems of high irreversible capacity and poor cycle performance of metal oxalate negative electrode materials, and provides a method for preparing a ferrous oxalate composite negative electrode material for lithium-ion batteries coated with FeOOH on the surface

Method used

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  • Lithium ion battery ferrous oxalate composite negative electrode material and preparation method thereof
  • Lithium ion battery ferrous oxalate composite negative electrode material and preparation method thereof
  • Lithium ion battery ferrous oxalate composite negative electrode material and preparation method thereof

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Embodiment 1

[0020] Embodiment 1: the preparation method of the lithium-ion battery ferrous oxalate composite negative electrode material of this surface coating FeOOH is as follows:

[0021] (1) Add ferrous sulfate to deionized aqueous solution, stir until completely dissolved to obtain a ferrous sulfate solution with a mass concentration of 8%; add dihydrate oxalic acid to absolute ethanol, stir until completely dissolved to obtain a colorless solution with a mass concentration of 15% Transparent oxalic acid solution; mix the above two solutions and stir for 1 hour, transfer the mixed suspension to a high-temperature and high-pressure reactor, and react at 60°C for 12 hours; after the reaction is complete, cool to room temperature, and dilute The yellow reaction product was centrifuged and washed with deionized water and absolute ethanol to remove water-soluble impurities, then placed in a vacuum drying oven and dried at 80°C to obtain ferrous oxalate dihydrate, wherein the molar ratio of...

Embodiment 2

[0028] Embodiment 2: the preparation method of the ferrous oxalate composite negative electrode material of the lithium ion battery of this surface coating FeOOH is as follows:

[0029] (1) Add ferrous sulfate to deionized aqueous solution, stir until completely dissolved to obtain a ferrous sulfate solution with a mass concentration of 15%; add dihydrate oxalic acid to absolute ethanol, stir until completely dissolved to obtain a mass concentration of 5% transparent oxalic acid solution; mix the above two solutions and stir for 2 hours, transfer the mixed suspension to a high-temperature and high-pressure reactor, and react at 100°C for 8 hours; after the reaction is complete, cool to room temperature, and The light yellow reaction product was separated by centrifugation, washed with deionized water and absolute ethanol to remove water-soluble impurities, and then placed in a vacuum drying oven and dried at 60°C to obtain ferrous oxalate dihydrate, wherein the molar ratio of f...

Embodiment 3

[0035] Embodiment 3: the preparation method of the lithium-ion battery ferrous oxalate composite negative electrode material of this surface coating FeOOH is as follows:

[0036] (1) Add ferrous sulfate to deionized aqueous solution, stir until completely dissolved to obtain a ferrous sulfate solution with a mass concentration of 20%; add dihydrate oxalic acid to absolute ethanol, stir until completely dissolved to obtain a colorless solution with a mass concentration of 10% Transparent oxalic acid solution; mix the above two solutions and stir for 3 hours, transfer the mixed suspension to a high-temperature and high-pressure reactor, and react at 50°C for 24 hours; after the reaction is complete, cool to room temperature, and dilute The yellow reaction product was centrifuged and washed with deionized water and absolute ethanol to remove water-soluble impurities, then placed in a vacuum drying oven and dried at 60°C to obtain ferrous oxalate dihydrate, wherein the molar ratio ...

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Abstract

The invention discloses a lithium ion battery ferrous oxalate composite negative electrode material and a preparation method thereof, and belongs to the technical field of lithium ion battery negativeelectrode materials. The method comprises the following steps: sequentially adding ferric chloride and hexadecyl trimethyl ammonium bromide into deionized water, and stirring until the ferric chloride and the hexadecyl trimethyl ammonium bromide are completely dissolved to obtain a ferric chloride solution; carrying out solvothermal method synthesis to obtain a ferrous oxalate dehydrate material;adding the obtained material into the ferric chloride solution, transferring turbid liquid obtained by ultrasonic treatment into a high-temperature and high-pressure reaction kettle for heating, coating the FeOOH material on the surfaces of ferrous oxalate particles in situ under a hydrothermal condition, sequentially cleaning and centrifugally separating precipitates after the reaction is finished, and drying the precipitates in a vacuum drying oven to obtain a precursor; and sintering the precursor through a vacuum tube furnace under an inert atmosphere condition to obtain a FeOOH surface coated ferrous oxalate composite negative electrode material. The method effectively solves the problems of high irreversible capacity, poor cycle performance and the like of the metal oxalate negativeelectrode material.

Description

technical field [0001] The invention relates to a lithium ion battery ferrous oxalate composite negative electrode material coated with FeOOH on the surface and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] In recent years, lithium-ion batteries with high energy density and power density are widely used in portable electronic products, such as notebook computers and mobile phones, while in automotive applications, considering the demand for mileage and energy density of electric vehicles, lithium-ion batteries are in the There are still big challenges in terms of performance, cost and safety. Compared with many other alternative materials, metal oxalates based on conversion reactions have the advantages of high reversible capacity, excellent cycle performance, abundant resources, environmental friendliness, and high safety. However, metal oxalate anode materials are prone to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/58H01M10/0525
CPCH01M4/366H01M4/52H01M4/5825H01M10/0525H01M2004/027Y02E60/10
Inventor 姚耀春张克宇杨斌马文会米如中杨桂玲梁风
Owner KUNMING UNIV OF SCI & TECH
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