Lithium-rich manganese-based material and preparation method thereof

A lithium-rich manganese-based, nitrate-based technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high investment in equipment, difficulty in continuous production, and large environmental impact

Active Publication Date: 2013-03-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid phase co-precipitation process is cumbersome, it is difficult to achieve continuous production, the investment in equ

Method used

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  • Lithium-rich manganese-based material and preparation method thereof
  • Lithium-rich manganese-based material and preparation method thereof
  • Lithium-rich manganese-based material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0088] Example 1: Preparation of lithium-rich manganese-based materials

[0089] According to the chemical formula xLi 2 MnO 3 ·(1-x)LiMO 2 (x=0.6) Measure and weigh lithium nitrate, manganese acetate, nickel nitrate, M is Ni transition metal; dissolve these compounds in deionized water to obtain a solution with a total concentration of 3mol / L;

[0090] Add a citric acid dispersant to the solution, and stir for 3 hours at a temperature of 50°C. The amount of the dispersant added is 16% based on the total weight of the lithium nitrate, manganese acetate and nickel nitrate;

[0091] Then add the Tween-80 additive, the addition of the additive is 1.0% based on the total weight of the lithium nitrate, manganese acetate and nickel nitrate solution; stir and mix, then let the mixture solution stand for 6.2 hours, then add Deionized water solvent, the amount of deionized water is 2.0 times the volume of the mixture solution, diluted to obtain a precursor sol;

[0092] B. Spray dr...

Embodiment 2

[0105] Embodiment 2: Preparation of lithium-rich manganese-based materials

[0106] According to the chemical formula xLi 2 MnO 3 ·(1-x)LiMO 2 (x=0.3) Measure and weigh lithium nitrate, manganese acetate, nickel nitrate, chromium acetate, M is Ni, Mn and Cr (the mass ratio is 2:2:1) transition metal; dissolve these compounds in deionized water, Obtaining a solution with a total concentration of 2.5mol / L;

[0107] Add glucose dispersant to the solution, and stir for 2.4 hours at a temperature of 70°C. The amount of dispersant added is 12% based on the total weight of lithium nitrate, manganese acetate, nickel nitrate and chromium acetate;

[0108] Then add the polyacrylamide additive, the addition of the additive is 0.5% based on the total weight of the lithium nitrate, manganese acetate, nickel nitrate and chromium acetate solution; stir and mix, then allow the mixture solution to stand for 8 hours, Then add absolute ethanol solvent, the amount of its absolute ethanol is 1...

Embodiment 3

[0115] Embodiment 3: Preparation of lithium-rich manganese-based materials

[0116] According to the chemical formula xLi 2 MnO 3 ·(1-x)LiMO 2 (x=0.5) Measure and weigh lithium nitrate, manganese acetate, nickel nitrate, cobalt nitrate, M is Ni, Mn and Co (the mass ratio is 1:1:1) transition metal; dissolve these compounds in deionized water, Obtaining a solution with a total concentration of 3.5mol / L;

[0117] Adding a sucrose dispersant to the solution, stirring at a temperature of 85° C. for 1.0 hour, the amount of the dispersant added is 20% based on the total weight of the lithium nitrate, manganese acetate, nickel nitrate and cobalt nitrate;

[0118] Then add the tributyl phosphate additive, the addition of the additive is 2.0% based on the total weight of the lithium nitrate, manganese acetate, nickel nitrate and cobalt nitrate solution; stir and mix, then allow the mixture solution to stand for 5 hours , then add acetone solvent, the amount of acetone is 0.8 times ...

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Abstract

The invention relates to a lithium-rich manganese-based material and a preparation method thereof. The preparation method is a sol-spray pyrolysis method and comprises the steps of precursor sol preparation, spray drying, high-temperature calcining and the like. The preparation method disclosed by the invention has the advantages of simple process flow, less equipment input, high continuous degree and no exhaust of tail gas or discharge of waste liquid. The lithium-rich manganese-based anode material disclosed by the invention has excellent electrochemical performance, discharge capacity as high as 225-250A.h.g<-1> and favorable excellent performance; and under the multiplying power of 0.5C, the discharge capacity of the lithium-rich manganese-based material can be maintained over 150mA.h.g<-1>.

Description

【Technical field】 [0001] The invention belongs to the technical field of cathode materials of lithium ion batteries. More specifically, the present invention relates to a lithium-rich manganese-based material, and also relates to a preparation method of the lithium-rich manganese-based material. 【Background technique】 [0002] Lithium-ion batteries have been maturely used in portable electronic products such as mobile phones, notebooks, digital cameras, and electric tools, and are gradually being used in large and medium-sized electrical equipment such as electric bicycles, electric vehicles, mobile base stations, and submarines. With the rapid development of IT, electronics, automation and other fields, higher requirements are placed on the energy density of lithium-ion batteries. The low capacity of positive electrode materials has become the bottleneck of increasing the energy density of lithium-ion batteries. At present, the capacity of the main positive electrode mater...

Claims

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Application Information

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IPC IPC(8): H01M4/505
CPCY02E60/122Y02E60/10
Inventor 郭孝东钟本和廖世宣唐艳刘恒
Owner SICHUAN UNIV
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