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High-energy-density lithium-ion battery and preparation method thereof

A lithium-ion battery and energy technology, which is used in secondary batteries, battery electrodes, battery pack components, etc. Large gas volume and other problems, to achieve good electrical conductivity, good electrical conductivity, and the effect of reducing the expansion of the negative electrode

Pending Publication Date: 2017-11-24
SHANDONG GOLDENCELL ELECTRONICS TECH
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Problems solved by technology

At present, nickel-cobalt-lithium-aluminate cathode material has a high energy density and is widely used in the preparation of high specific energy batteries. However, due to the high residual alkalinity of the cathode nickel-cobalt-lithium aluminate cathode material, it is easy to absorb water, the viscosity of the slurry and the coating stability. It is not easy to control, causing a large amount of gas production in the power battery, relatively poor safety performance, and high specific energy batteries use more negative electrodes that use more silicon-based materials. The volume of silicon-based materials expands during charging and discharging, causing active particles to pulverize, and the rate And cycle performance is poor, which limits the development of high specific energy lithium-ion batteries of this system

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  • High-energy-density lithium-ion battery and preparation method thereof

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Embodiment

[0025] 100140200-60Ah-3.7V high specific energy lithium-ion battery preparation, first 80kg positive electrode active material nickel cobalt lithium aluminate (LiNi 0.88 co 0.08 al 0.04 o 2 ), 18.9kg lithium iron manganese phosphate (LiFe 0.4 mn 0.6 PO 4 ), 25kg of single-armed carbon nanotube conductive liquid (the solvent is N-methylpyrrolidone NMP single-armed carbon nanotube solution with a solid content of 0.4%), 1kg of binder polyvinylidene fluoride (PVDF), 30kg of N-methylpyrrolidone (NMP ) into a 100L mixer to mix and disperse evenly, and coat on a (12±1) μm thick aluminum foil current collector, and coat both sides with a density of (500±4) g / m 2 , the thickness of the roll is (155±3) μm, and cut to obtain a positive electrode sheet with a length*width of the material area of ​​180mm*134mm. Then carry out the preparation of high specific energy lithium-ion battery negative plate, 4.9kg nano-silicon (Si), 44.1kg artificial graphite (C), 25kg single-armed carbon n...

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Abstract

The invention discloses a high-energy-density lithium-ion battery and a preparation method thereof. A positive electrode is prepared from lithium nickel cobalt aluminate, lithium ferric manganese phosphate, a single-walled carbon nanotube and polyvinylidene fluoride at a certain ratio; and a negative electrode is prepared from nanometer silicon, synthetic graphite, the single-walled carbon nanotube and polypropylene. The lithium-ion battery prepared through the method is high in energy density and long in cycle life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a high specific energy lithium ion battery and a preparation method thereof. Background technique [0002] With the upgrading of electronic products, the rapid promotion of smart grids, and the promulgation and implementation of new energy vehicle subsidy policies, how to improve the energy density of batteries has become the focus of in-depth research in the battery industry. At present, nickel-cobalt-lithium-aluminate cathode material has a high energy density and is widely used in the preparation of high specific energy batteries. However, due to the high residual alkalinity of the cathode nickel-cobalt-lithium aluminate cathode material, it is easy to absorb water, the viscosity of the slurry and the coating stability. It is not easy to control, causing a large amount of gas production in the power battery, relatively poor safety performance, and high specific ene...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/58H01M4/583H01M4/62H01M10/0583H01M2/16H01M50/409
CPCH01M4/525H01M4/5825H01M4/583H01M4/623H01M10/0583H01M50/409Y02E60/10Y02P70/50
Inventor 张敬捧王勇李涛
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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