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Lithium ion battery with high energy density

A lithium-ion battery, high energy density technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing the proportion of active materials, increasing the energy density of electrodes and energy storage devices, etc., to improve energy density, The effect of reducing the proportion

Pending Publication Date: 2019-08-16
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But they all have a common defect, that is, they need to be added in a large proportion to meet the requirements of product application for electrode conductivity, which in turn reduces the proportion of active materials in electrodes and increases the energy density of electrodes and energy storage devices.

Method used

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  • Lithium ion battery with high energy density
  • Lithium ion battery with high energy density

Examples

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Embodiment 1

[0033] The model of the lithium-ion battery in this embodiment: 385763P;

[0034] (1) Positive electrode: active material of positive electrode system, lithium cobaltate, physical and chemical properties of lithium cobaltate: D50: 19.5um, specific surface area: 0.12m 2 / g, the conductive agent used in the positive electrode system is single-walled carbon nanotubes, the diameter d of single-walled carbon nanotubes: 1.6nm, and the specific surface area: 98m 2 / g, length: 8um, the addition amount is 0.06%, the compacted density of the positive pole piece is: 3.84-3.88 g / cm 3 .

[0035] (2) Negative electrode: Negative electrode is artificial graphite, the physical and chemical properties of artificial graphite: D50: 19.2um, specific surface area: 1.32m 2 / g, tap density: ≥1.0g / cm 3 , the compacted density of the negative pole piece is: 1.65-1.67 g / cm 3 .

[0036] (3) Electrolyte system: The volume ratio of EC / DEC / EMC in the solvent of the electrolyte system is 1:1:1, and the ...

Embodiment 2

[0067] The model of the lithium-ion battery in this embodiment: 355272P;

[0068] (1) Positive electrode: positive electrode system active material lithium cobalt oxide, physical and chemical properties of lithium cobalt oxide: D50: 17.15um, specific surface area: 0.15m 2 / g, the conductive agent used in the positive electrode system is single-walled carbon nanotubes, the diameter d of single-walled carbon nanotubes: 1.6nm, and the specific surface area: 98m 2 / g, length: 8um, the addition amount is 0.04%, the compacted density of the positive electrode sheet is: 3.90-3.94 g / cm 3 .

[0069] (2) Negative electrode: the negative electrode is artificial graphite and modified natural graphite, the ratio of artificial graphite and modified natural graphite is 1:1, the physical and chemical properties of artificial graphite and modified natural graphite: D50: 14.2um, specific surface area: 1.35m 2 / g, tap density: ≥1.0g / cm 3 , the compacted density of the negative pole piece is: ...

Embodiment 3

[0101] The model of the lithium-ion battery in this embodiment: 385763P;

[0102] (1) Positive electrode: The active materials of the positive electrode system are lithium cobalt oxide and lithium nickel cobalt manganese oxide. The amount of lithium nickel cobalt manganese oxide added is 25% of the total amount of lithium cobalt oxide and lithium nickel cobalt manganese oxide. Physical and chemical properties of lithium cobalt oxide: D50 :13um, specific surface area: 0.25m 2 / g, the conductive agent used in the positive electrode system is single-walled carbon nanotubes and multi-walled carbon nanotubes, the diameter d of single-walled carbon nanotubes: 1.2nm, and the specific surface area: 85m 2 / g, length: 5um, diameter d of multi-walled carbon nanotubes: 30nm; specific surface area: 85m 2 / g length: 5um; the total amount of conductive agent added is 0.06%, the amount of single-walled carbon nanotubes added is 9% of the total amount of single-walled carbon nanotubes and mul...

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Abstract

The invention provides a lithium ion battery with high energy density, which is composed of a diaphragm, a negative electrode, a positive electrode and an electrolyte system. The negative electrode ismade of artificial graphite or artificial graphite mixed with modified natural graphite. The positive electrode side includes a positive electrode system active substance which is lithium cobalt oxide or a mixture of lithium cobalt oxide and a lithium nickel cobalt manganese oxide ternary material. The conductive agent used in the positive electrode system is single-walled carbon nanotubes or single-walled carbon nanotubes mixed with multi-walled carbon nanotubes. Based on the positive electrode slurry, the amount of conductive agent added in the positive electrode system is 0.04-0.06%. The solvent of the electrolyte system is the mixed solution of EC / DEC / EMC. The lithium salt in the electrolyte system is LiPF6. The lithium ion battery with high energy density has the advantage as follows: because an optimized positive electrode conductive agent and an optimized electrolyte system are adopted, the energy density of the lithium ion battery is increased, the energy density of the electrodes is increased by 1.5-4% compared with the normal system, the lithium ion battery has high specific energy and cycle performance, and the capacity retention rate is as high as 88% after 500 cyclesof 0.5C charging and 0.5C discharging.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary battery chemical systems, in particular to a lithium-ion battery with high energy density. Background technique [0002] Lithium-ion batteries have the advantages of high theoretical specific capacity and energy density, long cycle life, no memory effect, and strong applicability. Since Sony's commercialization in 1991, it has received extensive attention and development. The rapid development of equipment such as notebook computers and mobile phones has rapidly become popular. As the design of modern electronic communication equipment develops in the direction characterized by "light, thin, short, and small", the demand for a small-volume, high-energy-density power lithium-ion battery system is increasingly urgent. [0003] The energy density of a lithium-ion battery depends on the gram capacity of the positive and negative active materials and the proportion of the active material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525H01M10/0569
CPCH01M4/362H01M4/525H01M4/625H01M10/0525H01M10/0569H01M2004/028H01M2300/004Y02E60/10
Inventor 孙志国张性双贾秋荣王浩王玉媛
Owner ZHENGZHOU BAK BATTERY CO LTD
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