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Layer-structured ternary material with rich lithium and high manganese as well as preparation method and application thereof

A ternary material, layered structure technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve problems such as the decline of electrochemical performance of materials, and achieve low cation mixing, good volume energy density, and low material cost. Effect

Active Publication Date: 2014-12-31
淮安新能源材料技术研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent application with the application number 201110292425.0 discloses a lithium-rich manganese-based ternary cathode material Li (1+z) [Ni x co y mn (1-x-y) ]O 2 , 0≤z≤0.2, 0.5≤x≤0.8, 0.1≤y≤0.2, because it is difficult to mix Li ions and nickel-cobalt-manganese evenly by solid-state method, so the calcination temperature is required to be higher than 800°C, high temperature makes Ni 2+ Occupy Li + The 3a position, resulting in cation mixing, thus reducing the electrochemical performance of the material

Method used

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  • Layer-structured ternary material with rich lithium and high manganese as well as preparation method and application thereof
  • Layer-structured ternary material with rich lithium and high manganese as well as preparation method and application thereof
  • Layer-structured ternary material with rich lithium and high manganese as well as preparation method and application thereof

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Effect test

Embodiment 1

[0022] 0.25 mol of nickel sulfate, 0.25 mol of cobalt sulfate and 0.5 mol of manganese sulfate were dissolved in 500 mL of deionized water to obtain transition metal mixed solution I. Feed N into the reactor 2 Air was used for 30 minutes to remove the oxygen in the system, and at the same time, the reactor was heated to 50°C with a water bath. Add the prepared 2mol / L ammonia solution into the reactor to a height of about 5cm, turn on the stirrer and start the reaction. Add the NaOH solution of transition metal mixed solution 1, 2mol / L ammonia solution and 2mol / L dropwise in the reactor at the speed of 0.5d / s simultaneously, in the reaction process, adjust the rate of addition of NaOH solution to keep the pH value of reaction solution Between 10.5±0.5. During the reaction, N was continuously fed 2 The gas maintains the anaerobic condition of the reaction process and prevents the oxidation of transition metals. After the dropwise addition, the stirring reaction was continued...

Embodiment 2

[0025] Dissolve 0.2 mol of nickel sulfate, 0.2 mol of cobalt sulfate and 0.6 mol of manganese sulfate in 500 mL of deionized water to obtain transition metal mixed solution II. Feed N into the reactor 2Air was used for 30 minutes to remove the oxygen in the system, and at the same time, the reactor was heated to 50°C with a water bath. Add the prepared 2mol / L ammonia solution into the reactor to a height of about 5cm, turn on the stirrer and start the reaction. At the same time, drop transition metal mixed solution II, 2mol / L ammonia solution and 2mol / L NaOH solution into the reaction kettle at a rate of 0.5d / s. During the reaction, adjust the drop rate of NaOH solution to keep the pH value of the reaction solution. Between 11.5±0.5. During the reaction, N was continuously fed 2 The gas maintains the anaerobic condition of the reaction process and prevents the oxidation of transition metals. After the dropwise addition, the stirring reaction was continued for 15 h, and the...

Embodiment 3

[0028] 0.15 mol of nickel sulfate, 0.15 mol of cobalt sulfate and 0.7 mol of manganese sulfate were dissolved in 500 mL of deionized water to obtain transition metal mixed solution III. Feed N into the reactor 2 Air was used for 30 minutes to remove the oxygen in the system, and at the same time, the reactor was heated to 50°C with a water bath. Add the prepared 2mol / L ammonia solution into the reactor to a height of about 5cm, turn on the stirrer and start the reaction. At the same time, add transition metal mixed solution III, 2mol / L ammonia solution and 2mol / L NaOH solution dropwise to the reactor at a rate of 0.5d / s. During the reaction, adjust the drop rate of NaOH solution to keep the pH value of the solution at Between 12.5±0.5. During the reaction, N was continuously fed 2 The gas maintains the anaerobic condition of the reaction process and prevents the oxidation of transition metals. After the dropwise addition, the stirring reaction was continued for 20 h, and t...

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Abstract

The invention relates to a ternary material with a rich-lithium and high-manganese layered structure as well as a preparation method and application of the layer-structured ternary material with rich lithium and high manganese. A chemical formula of the ternary material is shown as Li1+x(NiyCoyMn1-2y)O2, wherein x is greater than or equal to 0.2 and less than 1, and y is greater than 0 and less than 0.5. The preparation method of the ternary material comprises the following steps of preparing a precursor by using a coprecipitation method; mixing the precursor with a lithium compound; and preparing layer-structured ternary material with rich lithium and high manganese through high-temperature solid-phase reaction. The ternary material can serve as the positive electrode material of the lithimu ion battery. As the mixed arrangement of the cation in the ternary material is reduced, the ternary material shows preferable volume energy density, higher safety and lower material cost.

Description

technical field [0001] The invention relates to a battery material and a preparation method thereof, in particular to a lithium-rich high manganese layered structure ternary material, a preparation method and application thereof. Background technique [0002] Due to the advantages of high specific capacity, small self-discharge, long cycle life, light weight and environmental friendliness, lithium-ion batteries have become the main development direction of a new generation of clean energy. At present, they have been widely used in many fields such as portable electronic devices and electric vehicles. . Lithium-ion batteries are composed of four parts: positive electrode materials, negative electrode materials, electrolytes, and separators. Among them, positive electrode materials have always been the key to restricting the development of lithium-ion power batteries, and because of their relatively low energy and power density compared with negative electrode materials. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131
CPCY02E60/122Y02E60/10
Inventor 赵世玺李芳李宝华南策文
Owner 淮安新能源材料技术研究院
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