Preparation method of layered lithium-enriched manganese-based material Li1.2Ni0.13Co0.13Mn0.54O2

A lithium-rich manganese-based, layered technology, applied in nanotechnology, electrical components, electrochemical generators for materials and surface science, etc., can solve the problems of memory effect, high price, high toxicity, etc., and achieve good cycle Longevity and rate performance, improved specific capacity, good consistency

Inactive Publication Date: 2017-09-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Current chemical power sources, such as traditional lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries, etc., cannot meet the needs of today's market due to problems such as low energy density, memory effect, and environmental pollution.
At th

Method used

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  • Preparation method of layered lithium-enriched manganese-based material Li1.2Ni0.13Co0.13Mn0.54O2
  • Preparation method of layered lithium-enriched manganese-based material Li1.2Ni0.13Co0.13Mn0.54O2
  • Preparation method of layered lithium-enriched manganese-based material Li1.2Ni0.13Co0.13Mn0.54O2

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Co-precipitation steps to prepare nickel-cobalt-manganese carbonate precursor:

[0037] Such as figure 1 , nickel sulfate, cobalt sulfate, manganese sulfate are formulated into a uniform solution of 1mol / L according to the metal ion ratio Ni:Co:Mn=1:1:4 of the prepared material, and a sufficient amount of sodium carbonate is weighed to be mixed with 2mol / L The solution is used as a precipitating agent, and simultaneously, saturated ammonia is added to the sodium carbonate solution to form a 0.3mol / L ammonia complexing agent. The concentration of the bottom liquid in the reactor is 0.167mol / L, and the ratio of nickel, cobalt, manganese metal ions is the same as that of the feed liquid. The solution was continuously added to the reactor at a rate of 2 mL / min, and the reaction continued for 18 hours. Such as Figure 4 (a), (b), (c) are the SEM images of the precursor. After the reaction, the precursor in the kettle was left to stand for 2 hours, and then the precur...

Embodiment 2

[0044] The stirring speed was adjusted to 600rpm, and the remaining reaction conditions and experimental methods were exactly the same as in Example 1. Li prepared in this example 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 Electrochemical performance curves of layered lithium-rich manganese-based materials, such as Figure 5 shown. Figure 5 It is the 1C discharge cycle performance of the lithium-rich manganese-based positive electrode material of Example 2 and the charge-discharge curves of the first three weeks. It can be seen from the figure that the capacity of the material after 550 cycle charge-discharge cycles is basically unchanged compared with the initial discharge capacity, indicating that the material It has good high-rate cycle stability, but the specific capacity has been around 160mAh / g, which is not very high.

Embodiment 3

[0046] The pH of the reaction solution was adjusted to 8.5, and the remaining reaction conditions and experimental methods were exactly the same as in Example 1. Li prepared in this example 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 Electrochemical performance curves of layered lithium-rich manganese-based materials, such as Figure 6 shown. Figure 6 It is the 1C discharge cycle performance of the lithium-rich manganese-based positive electrode material in Example 3 and the charge-discharge curves of the first three weeks. After 200 cycles of charge-discharge cycles, the material prepared in this example is fully activated, and the battery capacity continues to rise to 200mAh / g or more, but after 200 charge-discharge cycles, the battery capacity drops to 160mAh / g, indicating that the cycle stability of the material is not very good, and the uniformity of the material is difficult to control.

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Abstract

The invention discloses a preparation method of a layered lithium-enriched manganese-based material Li1.2Ni0.13Co0.13Mn0.54O2, and belongs to the field of lithium ion battery electrode materials. The preparation method is a kilogram-grade engineering chain method, and one reaction kettle can prepare a kilogram-grade lithium-enriched manganese positive electrode material precursor at one time. The method comprises the following steps: taking cheap weak acid sodium salt as a precipitator, adjusting the pH by industrial grade alkaline hydroxide, providing Ni, Co and Mn lithium-intercalated matrixes by a transition metal salt solution and preparing a precursor [Ni0.13Co0.13Mn0.54]CO2 by a coprecipitation method, wherein the ratio of the precursor [Ni0.13Co0.13Mn0.54]CO2 to a lithium source according to the quantity of the substances is that M:Li is equal to 1:(1.2-1.5), M is the sum of the quantity of the substances such as Ni, Co and Mn, and the lithium atoms are 3 to 8 percent excessively; and after performing planetary ball milling and mixing, performing solid-phase reaction at high temperature of 750 to 950 DEG C for 12 to 18 hours to prepare the layered lithium-enriched manganese-based material Li1.2Ni0.13Co0.13Mn0.54O2 with high capacity and long life. The Li1.2Ni0.13Co0.13Mn0.54O2 material prepared by the method can solve the problem that the existing layered lithium-enriched material has low cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium-rich manganese-based positive electrode material with high voltage, high specific capacity and long service life. Background technique [0002] Since entering the 21st century, energy issues have been plaguing countries all over the world. With the rapid development of intelligent technology and industrial technology, a large amount of non-renewable resources are consumed. Now the competition between countries is not only a contest of economic strength, but more and more reflected in resources (coal, oil, natural gas), energy (solar, hydro, wind, geothermal, etc.) competition. In my country, the energy structure dominated by traditional petrochemicals can no longer meet the needs of the society, and the resulting environmental pollution, ecological imbalance and other problems are becoming more and more serious, endange...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 栗欢欢刘成洋陈彪王亚平陈龙江浩斌
Owner JIANGSU UNIV
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