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Lithium-rich manganese-based power battery and manufacturing method thereof

A lithium-rich manganese-based, power battery technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of low voltage, low compaction density, and low battery capacity of nickel-cobalt lithium manganese oxide platform

Active Publication Date: 2012-07-04
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Spinel lithium manganese oxide has low specific capacity, poor high-temperature cycle performance, low platform voltage of nickel-cobalt lithium manganese oxide, low compaction density, and poor safety, so the battery has low capacity, low platform voltage, and low energy density

Method used

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  • Lithium-rich manganese-based power battery and manufacturing method thereof
  • Lithium-rich manganese-based power battery and manufacturing method thereof
  • Lithium-rich manganese-based power battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve the positive electrode material in N-methylpyrrolidone amine, the weight ratio of the positive electrode material to N-methylpyrrolidone amine is 1:1, and the components of the positive electrode material are shown in Table 1. Stir evenly and coat on a surface with a thickness of 15 μm On the aluminum foil, after drying at 140 ° C, it is rolled to obtain a thickness of 200 μm and a compacted density of 2.8 g / cm 3 Dissolve the negative electrode material in water, the weight ratio of the negative electrode material to water is 1:1.2, each component of the negative electrode material is as shown in Table 2, after stirring evenly, coat it on a copper foil with a thickness of 10 μm, at 120 After drying at ℃, roll pressing to obtain a thickness of 80 μm and a compacted density of 1.8 g / cm 3After cutting the obtained positive and negative electrodes, stack them in order according to the positive electrode, diaphragm and negative electrode, and use the laminated struc...

Embodiment 2

[0043] The positive electrode material is dissolved in N, N-dimethylformamide, the weight ratio of the positive electrode material to N, N-dimethylformamide is 1: 1.5, the components of the positive electrode material are shown in Table 1, after stirring Coated on aluminum foil with a thickness of 17μm, dried at 145°C and rolled to obtain a thickness of 150μm and a compacted density of 3.1g / cm 3 Dissolve the negative electrode material in water, the weight ratio of the negative electrode material to water is 1:1, the components of the negative electrode material are shown in Table 2, after stirring evenly, coat it on a copper foil with a thickness of 12 μm, and heat it at 125°C After drying, roll pressing to obtain a thickness of 130 μm and a compacted density of 1.3 g / cm 3 After cutting the obtained positive and negative electrodes, stack them in order according to the positive electrode, diaphragm and negative electrode, and use the laminated structure to make a cell; weld t...

Embodiment 3

[0046] The positive electrode material is dissolved in N-methylpyrrolidone and N, N-dimethylformamide, the weight ratio of the positive electrode material to N-methylpyrrolidone and N, N-dimethylformamide is 1:1.2, each positive electrode material The components are shown in Table 1. Stir evenly and coat on an aluminum foil with a thickness of 20 μm. After drying at 150 ° C, it is rolled to obtain a thickness of 250 μm and a compacted density of 2.7 g / cm 3 Dissolve the negative electrode material in water, the weight ratio of the negative electrode material to water is 1:1.5, each component of the negative electrode material is shown in Table 2, after stirring evenly, coat it on a copper foil with a thickness of 10 μm, at 130 After drying at ℃, roll pressing to obtain a thickness of 130 μm and a compacted density of 1.5 g / cm 3 After cutting the obtained positive and negative electrodes, they are stacked in sequence according to the positive electrode, separator and negative el...

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Abstract

The invention discloses a lithium-rich manganese-based power battery which comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate comprises a positive current collector and a positive pole material coated on the positive current collector, the negative plate comprises a negative current collector and a negative pole material coated on the negative current collector, the positive pole material comprises a positive pole active substance, a positive pole conductive agent and a positive pole binding agent, the positive pole material further comprises a toughener and an activating agent, the positive pole active substance is of lithium-rich manganese-based, and the general formula of the lithium-rich manganese-based power battery is xLi2MnO3.(1-x) LiYO2, wherein Y is one or more of Co, Mn, Ni and Cr, x is more than 0 and less than 1, and the compacted density and the electric capacity of the battery are high. The invention further discloses a preparation method of the lithium-rich manganese-based power battery, and the lithium-rich manganese-based power battery prepared by the preparation method disclosed by the invention has the advantages of high energy density, high discharge capacity and the like.

Description

[0001] technical field [0002] The invention relates to the field of lithium-ion power batteries, in particular to a lithium-rich manganese-based power battery and a manufacturing method thereof. [0003] Background technique [0004] Lithium-ion batteries have been widely used since their commercialization in the early 1990s. The principle of this battery is to rely on the different deintercalation-insertion reaction potentials of lithium ions in the positive and negative active materials to obtain a potential difference. Lithium ions flow between the positive and negative electrodes, which is vividly called a rocking chair battery. [0005] The positive electrode material of lithium-ion batteries is the key raw material of lithium-ion batteries. Its performance determines the performance of lithium-ion batteries, and its price determines the cost of lithium-ion batteries. At present, lithium cobalt oxide is mainly used in the market. Cathode materials such as spinel lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M4/505H01M4/62H01M4/66
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 周伟瑛赵勇陈军
Owner WANXIANG 123 CO LTD
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