Thermal polymerization preparation method of manganides solid solution positive material

A cathode material, thermal polymerization technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor product performance consistency, unsatisfactory rate performance, large irreversible capacity, etc. Outstanding performance

Active Publication Date: 2012-07-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] From the existing literature and patents, it can be seen that the mainstream preparation process of lithium-rich solid solution cathode materials is co-precipitation combined with solid-phase method, and the material has high discharge potential and electrochemical capacity. PH adjustment, filtration, washing and other processes lead to poor consistency of product performance, large initial irreversible capacity of the sample and unsatisfactory rate performance

Method used

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  • Thermal polymerization preparation method of manganides solid solution positive material
  • Thermal polymerization preparation method of manganides solid solution positive material
  • Thermal polymerization preparation method of manganides solid solution positive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Prepare 1L of citric acid and ethylene glycol solution, and the ratio of the two substances is 1:4.

[0027] 2. According to the molecular formula Li[Ni 0.35 Li 0.1 Mn 0.55 ]O 2 The proportions of Li, Ni, Mn in the lithium acetate, nickel acetate, and manganese acetate are weighed. The molar percentage of lithium, nickel, and manganese metal ions is 0.11:0.035:0.055. The metal salt is dissolved in deionized water to form a total metal ion. A mixed metal salt solution with a concentration of 0.5 mol / L.

[0028] 3. Add the solution in 2 to the mixed solution described in 1, adjust the pH of the solution to 5 with 0.5 mol / L concentration of ammonia, and stir vigorously at 80° C. for 2 hours until the metal salt is completely dissolved and gradually forms a gel.

[0029] 4. Take out the gel obtained in 3 and place it in a vacuum drying oven, and dry it at 140°C for 12 hours to form a block precursor.

[0030] 5. Put the precursor into a muffle furnace, heat it up to 450°C at a r...

Embodiment 2

[0033] 1. Prepare 1L of citric acid and ethylene glycol solution, and the ratio of the two substances is 1:4.

[0034] 2. According to the molecular formula Li[Ni 0.35 Li 0.1 Mn 0.55 ]O 2 The proportions of Li, Ni, Mn in the lithium acetate, nickel acetate, and manganese acetate are weighed. The molar percentage of lithium, nickel, and manganese metal ions is 0.11:0.035:0.055. The metal salt is dissolved in deionized water to form a total metal ion. A mixed metal salt solution with a concentration of 0.2mol / L.

[0035] 3. Add the solution in 2 to the mixed solution described in 1, adjust the pH of the solution to 5 with 0.5 mol / L concentration of ammonia, and stir vigorously at 80° C. for 2 hours until the metal salt is completely dissolved and gradually forms a gel.

[0036] 4. Take out the gel obtained in 3 and place it in a vacuum drying oven, and dry it at 140°C for 12 hours to form a block precursor.

[0037] 5. Put the precursor into a muffle furnace, heat it up to 450°C at a ra...

Embodiment 3

[0040] 1. Prepare 1L of citric acid and ethylene glycol solution, and the ratio of the two substances is 1:4.

[0041] 2. According to the molecular formula Li[Ni 0.35 Li 0.1 Mn 0.55 ]O 2 The ratio of Li, Ni, Mn in the lithium sulfate, nickel sulfate, and manganese sulfate are weighed. The mole percentage of lithium, nickel, and manganese metal ions is 0.11:0.035:0.055. The metal salt is dissolved in deionized water to form a total metal ion. A mixed metal salt solution with a concentration of 0.5mol / L.

[0042] 3. Add the solution in 2 to the mixed solution described in 1, adjust the pH of the solution to 5 with 0.5 mol / L concentration of ammonia, and stir vigorously at 80° C. for 2 hours until the metal salt is completely dissolved and gradually forms a gel.

[0043] 4. Take out the gel obtained in 3 and place it in a vacuum drying oven, and dry it at 140°C for 12 hours to form a block precursor.

[0044] 5. Put the precursor into a muffle furnace, heat it up to 450°C at a rate of 2...

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Abstract

The invention relates to a thermal polymerization preparation method of a manganides solid solution positive material. The thermal polymerization preparation method comprises the following steps of: preparing a mixed solution comprising lithium salt, nickel salt and manganese salt according to a general form stoichiometric proportion; adding a thermal polymerization precursor solution to the mixed solution; stirring the mixed solution to polymerize to form a gelatinous material at the temperature of between 80 DEC and 120 DEC and pH of between 4 and 7; drying the obtained gelatinous material in vacuum at the temperature of between 140 DEC and 170 DEC to obtain a resinoid product; pre-burning the resinoid product for 5 to 20 hours at the temperature of between 400 DEC and 700 DEC; carrying out heat preserving on the resinoid product for 5 to 20 hours at the temperature of between 750 DEC and 1000 DEC; and slowly cooling the product to a room temperature after calcination to obtain a finished product. According to the thermal polymerization preparation method, the raw material component blending can reach to molecule degree level, larger nonuniformity of microcosmic material matching ratios by blending with a mechanical method can be avoided; the thermal polymerization preparation method is easy and simple to operate; and the synthetic product is fine and uniform in grain diameter, high in purity, higher in discharge ratio capacity, excellent in circulating performance and high temperature performance and remarkable in magnification performance and can serve as a high power lithium ion battery positive material.

Description

technical field [0001] The present invention relates to the positive electrode material technology for lithium-ion secondary battery, especially manganese series solid solution positive electrode material Li[Ni x Li (1-2x) / 3 mn (2-x) / 3 ]O 2 (0≤x≤0.5), the material prepared by the method can be applied to the positive electrode of lithium ion battery. Background technique [0002] As the core of electric vehicles, the mainstream direction of power batteries is lithium-ion power batteries. The positive electrode material of existing commercial lithium-ion secondary batteries uses lithium cobalt oxide (LiCoO 2 ), ternary class (LiNiMnCoO- 2 ), lithium manganate (LiMn 2 o 4 ), lithium iron phosphate (LiFePO 4 )wait. However, the theoretical capacity of these cathode materials is less than 200mAh / g, which makes it difficult for the market development of 3G electronic products and electric vehicles that require high battery capacity. Therefore, it is necessary to explore a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 杨尘刘大军曹贺坤
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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