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Tin-doped lithium-rich manganese-based positive electrode material and preparation method thereof

A lithium-rich manganese-based, positive electrode material technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve problems that have not been reported in the literature, achieve good controllability and reproducibility, simple operation, and improved stability Effect

Active Publication Date: 2019-11-22
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the preparation of tin-doped lithium-rich manganese-based cathode materials by co-precipitation method to improve their cycle stability has not been reported in the literature.

Method used

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  • Tin-doped lithium-rich manganese-based positive electrode material and preparation method thereof
  • Tin-doped lithium-rich manganese-based positive electrode material and preparation method thereof
  • Tin-doped lithium-rich manganese-based positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Co-precipitation synthesis of Li-rich material Li[Li 0.2 mn 0.53 Ni 0.13 co 0.13 sn 0.01 ]O 2 .

[0028] Weigh 4.659g NiCl 2 ·6H 2 O, 15.827g MnCl 2 4H 2 O, 4.663g CoCl 2 ·6H 2 O, 0.338gSnCl 2 2H 2 O was dissolved in 100ml of deionized water and stirred evenly to make a mixed salt solution; then weighed 13.040g of Na2 CO 3 Dissolve in 100ml of deionized water, and add 2.0ml of ammonia water with a concentration of 25% therein and mix well to prepare a mixed alkali solution. Add 50ml of deionized water into the reactor as the bottom liquid, and then use the peristaltic pump to add the above-mentioned mixed alkali solution and the above-mentioned mixed salt solution to the reactor at the same time, and adjust the reaction in the whole process by controlling the amount of mixed alkali solution added. The pH of the solution was 8.0, and the temperature of the reactor was controlled at 55° C. while stirring continuously at a stirring speed of 800 rpm.

[0029]...

Embodiment 2

[0034] Co-precipitation method to synthesize Li-rich material Li[Li 0.2 mn 0.52 Ni 0.13 co 0.13 sn 0.02 ]O 2 .

[0035] Weigh 4.754g NiCl 2 ·6H 2 O, 15.827g MnCl 2 4H 2 O, 4.759g CoCl 2 ·6H 2 O, 0.694gSnCl 2 2H 2 O was dissolved in 100ml of deionized water and stirred evenly to make a mixed salt solution; then weighed 13.040g of Na 2 CO 3 Dissolve in 100ml of deionized water, and add 2.0ml of ammonia water with a concentration of 25% therein and mix well to prepare a mixed alkali solution. Add 50ml of deionized water into the reactor as the bottom liquid, and then use the peristaltic pump to add the above-mentioned mixed alkali solution and the above-mentioned mixed salt solution to the reactor at the same time, and adjust the reaction in the whole process by controlling the amount of mixed alkali solution added. The pH of the solution was 8.0, and the temperature of the reactor was controlled at 55° C. while stirring continuously at a stirring speed of 800 rpm....

Embodiment 3

[0042] Weigh 5.257g NiSO 4 ·6H 2 O, 13.522g MnSO 4 ·H 2 O, 5.622g CoSO 4 ·7H 2 O, 0.694gSnCl 2 2H 2 O was dissolved in 100ml of deionized water and stirred evenly to make a mixed salt solution; then weighed 13.040g of Na 2 CO 3 Dissolve in 100ml of deionized water, and add 2.0ml of ammonia water with a concentration of 25% therein and mix well to prepare a mixed alkali solution. Add 50ml of deionized water into the reactor as the bottom liquid, and then use the peristaltic pump to add the above-mentioned mixed alkali solution and the above-mentioned mixed salt solution to the reactor at the same time, and adjust the reaction in the whole process by controlling the amount of mixed alkali solution added. The pH of the solution was 7.8, and the temperature of the reactor was controlled at 60° C. while stirring continuously at a stirring speed of 900 rpm.

[0043] After the above two mixed solutions stopped adding, continue to stir for 6 hours, then stand and age for 20 h...

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Abstract

The invention belongs to a lithium ion battery positive electrode material, and particularly relates to a tin-doped lithium-rich manganese-based positive electrode material and a preparation method thereof. The materials are metered according to stoichiometry; manganese salt, nickel salt, cobalt salt and tin salt are mixed to prepare a mixed salt aqueous solution, and performing coprecipitation toform a precursor precipitate; and mixing the precursor precipitate with a lithium source compound, and carrying out sectional heat treatment to obtain the tin-doped lithium-rich manganese-based positive electrode material of which the chemical formula is Li[LiaMnbCocNidSnx]O2, wherein a + b + c + d + x = 1, a, b, c, d and x is more than 0. The coprecipitation method for preparing the tin-doped lithium-rich manganese-based positive electrode material is simple in technological process, convenient to operate and suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to lithium-ion battery cathode materials, in particular to a tin-doped lithium-rich manganese-based cathode material and a preparation method thereof. Background technique [0002] With the rapid development of society and economy, the problems of energy shortage and environmental pollution are becoming more and more serious. The development and utilization of clean energy and efficient energy conversion and storage systems are urgent tasks for the sustainable development of today's society. In the past two decades, lithium-ion batteries, one of the energy storage systems, have dominated the development of high-energy green batteries because of their significant advantages of high voltage, high energy density, long life and good safety performance. Lithium-ion batteries have been used in It is widely used in portable electronic equipment, medical equipment, electric vehicles, space technology and defense industry. With the global...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王晓刚尚怀芳夏定国王一丰
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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