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Preparation method of positive electrode material of lithium manganate battery

A lithium manganese oxide battery and positive electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle capacity attenuation performance, restricting the utilization of power batteries, etc., and achieve the goal of improving capacity retention and improving performance Effect

Active Publication Date: 2019-06-14
江西省灿辉新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the current research and improvement of lithium manganate cathode materials have achieved certain results, the high-temperature (above 50°C) cycle capacity fading performance of lithium manganate in the prior art is still poor, which restricts its use in power batteries. In urgent need of optimization and improvement

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] A preparation method of lithium manganate battery cathode material, comprising the steps of:

[0020] (1) According to the mixed mass ratio of α-MnO 2 : α-Al 2 o 3 =10:0.5 weigh MnO 2 and Al 2 o 3 Mix, and the mixture is dispersed in an aqueous solution of sodium pyrophosphate with a sodium pyrophosphate concentration of 1g / 100mL, wherein the quality of the aqueous solution of sodium pyrophosphate should be MnO 2 and Al 2 o 3 8 times the total mass of the mixture, fully stirred to obtain suspension A;

[0021] (2) Add lithium hydroxide in the suspension A, the molar weight that lithium hydroxide adds is MnO in the suspension A 2 2 times the molar weight; during the addition process, the solution was constantly stirred, and after lithium hydroxide was added, sodium dodecylbenzenesulfonate and N-methylpyrrolidone were added to the solution under the state of stirring the solution to obtain a suspension B. Wherein the addition amounts of sodium dodecylbenzenesulf...

Embodiment 2

[0027] A preparation method of lithium manganate battery cathode material, comprising the steps of:

[0028] (1) According to the mixed mass ratio of α-MnO 2 : α-Al 2 o 3 =10:0.7 weigh MnO 2 and Al 2 o 3 Mix, and the mixture is dispersed in an aqueous solution of sodium pyrophosphate whose concentration of sodium pyrophosphate is 1.4g / 100mL, wherein the quality of the aqueous solution of sodium pyrophosphate should be MnO 2 and Al 2 o 3 8 times the total mass of the mixture, fully stirred to obtain suspension A;

[0029] (2) Add lithium hydroxide in the suspension A, the molar weight that lithium hydroxide adds is MnO in the suspension A 2 2 times the molar weight; during the addition process, the solution was constantly stirred, and after lithium hydroxide was added, sodium dodecylbenzenesulfonate and N-methylpyrrolidone were added to the solution under the state of stirring the solution to obtain a suspension B. Wherein the addition amounts of sodium dodecylbenzene...

Embodiment 3

[0035] A preparation method of lithium manganate battery cathode material, comprising the steps of:

[0036] (1) According to the mixed mass ratio of α-MnO 2 : α-Al 2 o 3 =10:0.9 weigh MnO 2 and Al 2 o 3 Mix, and the mixture is dispersed in an aqueous solution of sodium pyrophosphate whose concentration of sodium pyrophosphate is 2g / 100mL, wherein the quality of the aqueous solution of sodium pyrophosphate should be MnO 2 and Al 2 o 3 8 times the total mass of the mixture, fully stirred to obtain suspension A;

[0037] (2) Add lithium hydroxide in the suspension A, the molar weight that lithium hydroxide adds is MnO in the suspension A 2 3 times the molar weight; during the addition process, the solution was constantly stirred, and after lithium hydroxide was added, sodium dodecylbenzenesulfonate and N-methylpyrrolidone were added to the solution under the state of stirring the solution to obtain a suspension B. Wherein the addition amount of sodium dodecylbenzenesul...

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Abstract

The invention discloses a preparation method of a positive electrode material of a lithium manganate battery, which comprises the following steps: (1) weighing a certain amount of MnO2 and Al2O3 and mixing and dispersing in an aqueous solution of sodium pyrophosphate to obtain a suspension A; (2) adding lithium hydroxide, sodium dodecylbenzene sulfonate and N-methyl pyrrolidone to obtain a suspension B; (3), heating the suspension B to 170-180 DEG C for reaction for more than 10 hours, and filtering to obtain a solid phase A after the reaction; (4) soaking the solid phase A in an ethanol solution of chloroiridic acid, and then taking out and drying; (5), calcining the solid phase A to obtain a solid phase B; (6) immersing the solid phase B in the ethanol solution of niobium pentachloride and nickel nitrate, then filtering out, drying and calcining to obtain the positive electrode material of the lithium manganate battery. By improving the preparation method of the lithium manganate positive electrode material, the invention makes the obtained lithium manganate used in the production of the battery, the capacity retention rate of the battery at normal temperature or high temperatureis significantly improved, and the service performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a preparation method of a positive electrode material of a lithium manganate battery. Background technique [0002] Since the Goodenough group discovered the positive electrode material of spinel lithium manganate in 1984, it has been widely used because of its simple production process, huge storage capacity, high current charge and discharge capacity, good overcharge resistance, low cost, and non-toxic and non-polluting. It is one of the widely optimistic and researched lithium battery cathode materials. However, during the cycle of lithium manganese oxide batteries, there will be Mn dissolution, Jahn-Teller effect and electrolyte decomposition, etc., resulting in rapid capacity decay of lithium manganate batteries, poor high temperature performance, and seriously affecting the lithium manganate cathode material. application. Therefore, improving the cyc...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M10/0525
CPCY02E60/10
Inventor 邓敏郭明铭陈洲宇
Owner 江西省灿辉新能源科技有限公司
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