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A lithium ion battery and a preparation method thereof

A lithium-ion battery and conductive agent technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of short cycle life and slow charging speed, and achieve the effects of extending service life, simple production and reduced expansion.

Inactive Publication Date: 2018-12-25
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a lithium-ion battery with fast charging and high stability. The positive electrode of the battery adopts reduced graphene (rGO) with high conductivity and high specific surface area as the conductive agent material to ensure that the system has superior Electron mobility, using LiFePO with high structural stability 4 As an active material, even under high-rate charging conditions, the spatial structure of the positive electrode material will not collapse. At the same time, the negative electrode active material uses carbon materials with high-layer spacing to ensure that lithium ions can be quickly intercalated and deintercalated under high-rate charge and discharge conditions, and lithium ions During the process of entering and exiting, the interlayer expansion of the material is reduced, and the combined use of the positive and negative electrodes improves the cycle performance of the battery, prolongs the service life, and can be fully charged within a few minutes, realizing the fast and long-lasting use characteristics of lithium-ion batteries, solving the problem of Solved the problem of the current lithium-ion battery charging speed is too slow and the cycle life is short

Method used

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  • A lithium ion battery and a preparation method thereof
  • A lithium ion battery and a preparation method thereof
  • A lithium ion battery and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of positive electrode ingredients: LiFePO 4 , SP, rGO, PVDF were dissolved in the NMP solution according to the mass ratio of 96:1.5:1.5:1, fully stirred for 10 hours to make it evenly dispersed, and the mixed slurry was mixed at 100g / m 2 The density of one side of the aluminum foil is coated on the surface of the aluminum foil, dried at 120°C, and rolled and compacted at room temperature;

[0041] Preparation of negative electrode ingredients: Dissolve hard carbon, SP, dispersant (CMC), and binder (SBR) in deionized water at a ratio of 95:2:1.5:1.5, stir for 10 hours to disperse evenly, and mix The slurry is 50g / m 2 Coated on the surface of the copper foil with a density of one side, dried at 100°C, and rolled at room temperature for compaction;

[0042] Assembly and packaging of lithium-ion batteries: stack a certain number of negative electrodes (16 pieces), separators, and positive electrodes (15 pieces) in order to ensure that the length and width of ...

Embodiment 2

[0046] Preparation of positive electrode ingredients: LiFePO 4 , SP, and PVDF were dissolved in NMP solution at a mass ratio of 96:3:1, stirred thoroughly for 10 hours to make them evenly dispersed, and the mixed slurry was mixed at 100g / m 2 The density of one side of the aluminum foil is coated on the surface of the aluminum foil, dried at 120°C, and rolled and compacted at room temperature;

[0047] Preparation of negative electrode ingredients: Dissolve hard carbon, SP, dispersant (CMC), and binder (SBR) in deionized water at a ratio of 95:2:1.5:1.5, stir for 10 hours to disperse evenly, and mix The slurry is 50g / m 2 Coated on the surface of the copper foil with a density of one side, dried at 100°C, and rolled at room temperature for compaction;

[0048] Assembly and packaging of lithium-ion batteries: stack a certain number of negative electrodes (16 pieces), separators, and positive electrodes (15 pieces) in order to ensure that the length and width of the negative ele...

Embodiment 3

[0051] Preparation of positive electrode ingredients: LiFePO 4 , SP, rGO, PVDF were dissolved in the NMP solution according to the mass ratio of 96:1.5:1.5:1, fully stirred for 10 hours to make it evenly dispersed, and the mixed slurry was mixed at 100g / m 2 The density of one side of the aluminum foil is coated on the surface of the aluminum foil, dried at 120°C, and rolled and compacted at room temperature;

[0052] Preparation of negative electrode ingredients: Dissolve graphite, SP, dispersant (CMC), and binder (SBR) in deionized water at a ratio of 95:2:1.5:1.5, stir for 10 hours to disperse evenly, and mix the Slurry at 50g / m 2 Coated on the surface of the copper foil with a density of one side, dried at 100°C, and rolled at room temperature for compaction;

[0053] Assembly and packaging of lithium-ion batteries: stack a certain number of negative electrodes (16 pieces), separators, and positive electrodes (15 pieces) in order to ensure that the length and width of the...

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Abstract

A fast charge and highly stable lithium ion battery is provided. As the positive electrode of the battery uses reduced graphene (rGO) with high conductivity and high specific surface area as conductive material, the system has excellent electron mobility; LiFePO4 with high structural stability is used as active material, so the space structure of the positive electrode material does not collapse even under the condition of high rate charging; the negative electrode active material adopts the carbon material with high-layer spacing, which ensures that lithium ions can be rapidly intercalated and desintercalated under the condition of high rate charge and discharge and the expansion between the material layer is reduced during the lithium ion entering and leaving process. The use of the positive electrode and the negative electrode makes the battery cycle performance improved, the service life is prolonged, and the lithium ion battery can be charged quickly in a few minutes; the servicecharacteristic of the lithium ion battery with fast and long effect is realized, and the problem that the charging speed of the lithium ion battery is too slow and the cycle life is short in the priorart is solved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to an ultra-fast charging, high-stability lithium-ion battery and a preparation method thereof. Background technique [0002] With the rapid development of human society, people have put forward more demands on energy. As a non-renewable energy, traditional fossil energy has gradually been unable to meet the needs of people's lives. How to develop new sustainable energy is imminent. Lithium-ion batteries, as a new type of sustainable energy, have been widely studied and used in electric vehicles, passenger cars, buses, and energy storage due to their characteristics of high capacity, light weight, pollution-free, and long life. [0003] At present, the key factors that inhibit the large-scale application of lithium-ion batteries are mainly charging time and service life. For example, the charging time of mobile batteries used more often is about 5 to 10 hour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0525H01M10/0585H01M10/0569
CPCH01M4/362H01M4/5825H01M4/587H01M4/625H01M10/0525H01M10/0569H01M10/0585H01M2300/0037Y02E60/10Y02P70/50
Inventor 李掌权章雄峰张黎张浩楠李小平桂亚林
Owner 桑顿新能源科技(长沙)有限公司
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