Lithium ferric borate block type electrode and preparation method thereof

A block-shaped, lithium-ion battery technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve difficult problems such as improving the volume specific capacity of lithium-ion batteries, shorten the preparation cycle, reduce production process costs, reduce The effect of raw material costs

Active Publication Date: 2015-03-18
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
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AI Technical Summary

Problems solved by technology

The theoretical mass specific capacity of polyanionic compound iron-based positive electrode materials is generally high, but it is still difficult to improve the volume specific capacity of lithium-ion batteries when used in electrode thin film coating technology

Method used

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  • Lithium ferric borate block type electrode and preparation method thereof
  • Lithium ferric borate block type electrode and preparation method thereof
  • Lithium ferric borate block type electrode and preparation method thereof

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[0029] The invention provides a method for preparing a positive electrode of a lithium ion battery, the method comprising the following steps:

[0030] (1) adding lithium source aqueous solution or suspension, ferric iron source aqueous solution or suspension and boron source aqueous solution or suspension to carbon source aqueous solution in sequence to obtain a mixed solution;

[0031] (2) drying the mixed solution obtained in step (1) to obtain a lithium iron borate precursor;

[0032] (3) Mix the lithium iron borate precursor obtained in step (2) with organic matter to obtain LiFeBO 3 / C precursor;

[0033] (4) LiFeBO obtained in step (3) 3 / C precursor is molded into bulk to obtain LiFeBO 3 / C bulk electrode precursor;

[0034] (5) LiFeBO obtained in step (4) 3 The / C bulk electrode precursor is calcined under the protection of an inert atmosphere to obtain the positive electrode of the lithium-ion battery.

[0035] In the preparation method provided by the present ...

Embodiment 1

[0055] Dissolve 0.0144mol of lithium carbonate, 0.0288mol of boric acid, and 0.0288mol of ferric nitrate in 20mL of water, dissolve 0.014mol of citric acid and 0.009mol of glucose in 20mL of water, stir at a speed of 1200r / min, and successively dissolve the lithium carbonate suspension , ferric nitrate solution and boric acid solution were added to citric acid and glucose solution, and the mixed solution was continuously stirred for 6 hours to obtain a clear and transparent mixed solution. The mixed solution was dried at 80° C. for 16 hours, then heated and decomposed at 220° C. for 4 hours, and ground to obtain a lithium iron borate precursor. The lithium iron borate precursor was ball-milled with 0.0072mol glucose to obtain LiFeBO 3 / C precursor. LiFeBO 3 The / C precursor is cold-pressed in a Φ10mm mold with a cold-pressing pressure of 80 MPa and a cold-pressing time of 120 seconds to obtain LiFeBO 3 / C bulk electrode precursor. This LiFeBO 3 / C The block electrode prec...

Embodiment 2

[0057] Add 0.0288mol of lithium hydroxide, 0.0325mol of boric acid, and 0.0144mol of ferric oxide into 40mL of water, dissolve 0.014mol of citric acid and 0.015mol of sucrose in 20mL of water, stir at a speed of 1000r / min, and successively dissolve hydrogen Lithium oxide solution, ferric oxide suspension and boric acid solution were added to citric acid and sucrose solution, and the mixed solution was continuously stirred for 8 hours to obtain a clear and transparent mixed solution. The mixed solution was dried at 60° C. for 20 hours, then heated and decomposed at 220° C. for 6 hours, and ground to obtain a lithium iron borate precursor. The lithium iron borate precursor was ball milled with 0.0072mol ascorbic acid to obtain LiFeBO 3 / C precursor. LiFeBO 3 The / C precursor is cold-pressed in a Φ10mm mold with a cold-pressing pressure of 60 MPa and a cold-pressing time of 240 seconds to obtain LiFeBO 3 / C bulk electrode precursor. This LiFeBO 3 / C The block electrode precu...

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Abstract

The invention provides a lithium ferric borate block type electrode and a preparation method thereof. The preparation method of the lithium ion battery cathode comprises the following steps: (1), sequentially adding a lithium source water solution or suspension, a ferric iron source water solution or suspension and a boron source water solution or suspension in a carbon source water solution to obtain a mixed solution; (2) drying the mixed solution obtained in the step (1) to obtain a lithium ferric borate precursor; (3) mixing the lithium ferric borate precursor obtained in the step (2) with an organic matter to obtain a LiFeBO3 / C precursor; (4) forming the LiFeBO3 / C precursor obtained in the step (3) into a blocky shape to obtain a LiFeBO3 / C blocky type electrode precursor; and (5) calcining the LiFeBO3 / C block type electrode precursor obtained in the step (4) under the protection of an inert atmosphere. The lithium ion battery assembled by adopting the lithium ion battery cathode prepared according to the preparation method provided by the invention has excellent electrochemical performance.

Description

technical field [0001] The invention relates to a lithium iron borate bulk electrode and a preparation method thereof. Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries have the advantages of high working voltage, high specific energy, small self-discharge, and no memory effect. With their long cycle life and high safety and stability, small-sized lithium-ion batteries are used in small digital devices Power supply has occupied an important position, especially for portable electronic tools such as notebook computers, mobile phones and personal digital products. At the same time, large-size lithium-ion batteries are the most promising energy storage devices for storing emerging energy sources (such as wind energy, solar energy, tidal power, etc.) and energy storage devices for electric vehicles and hybrid electric vehicles, which can alleviate industrial pressure. The excessive reliance on fossil fuels, and thus the redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397
CPCH01M4/136H01M4/1397H01M2004/028Y02E60/10
Inventor 褚卫国何岩王汉夫
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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