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Lithium ion battery

A lithium-ion battery and electrolyte technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of shortening the service life of lithium-ion batteries, reducing battery life, and inconvenience to users, and achieves excellent low-temperature charging and discharging characteristics, improved stability, and reduced impedance

Inactive Publication Date: 2015-07-15
SHENZHEN MEIBAI ELECTRONIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the current smart phones basically need to be charged once a day, and it takes 3 to 5 hours to fully charge, which brings great inconvenience to users.
[0004] In addition, the service life of lithium-ion batteries will be shortened in low-temperature environments. For example, in winter in the north, the battery life of lithium-ion batteries will be significantly reduced. "Lithium dendrites" are produced, which in turn raises safety concerns

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0036] A lithium-ion battery includes a positive electrode sheet, a negative electrode sheet, a diaphragm spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte.

[0037] Wherein, the negative electrode sheet includes a negative electrode active material, a negative electrode conductive agent, a binder and a negative electrode current collector, the negative electrode active material is agglomerated secondary artificial graphite particles, and the D50 of the secondary artificial graphite particles is 21.0 μm, the specific surface area is 1.5m 2 / g, the compacted density is 1.65g / cm 3 ; The artificial graphite particles are coarsely crushed into particles with a particle size of 10.5±1.0 μm, then coated with 15% asphalt, and agglomerated into secondary particles, and then heated at a temperature above 3000 ° C. Obtained by ultra-high temperature graphitization.

[0038] Among them, kneading and mixing the binder, negative electrode ac...

Embodiment approach 2

[0051] A lithium-ion battery includes a positive electrode sheet, a negative electrode sheet, a diaphragm spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte.

[0052] Wherein, the negative electrode sheet includes a negative electrode active material, a negative electrode conductive agent, a binder and a negative electrode current collector, the negative electrode active material is agglomerated secondary artificial graphite particles, and the D50 of the secondary artificial graphite particles is 22 μm , with a specific surface area of ​​1.4m 2 / g, the compacted density is 1.68g / cm 3 The artificial graphite particles are coarsely crushed into particles with a particle size of 5.0 μm, then coated with 20% pitch in a homogeneous manner, and agglomerated into secondary particles, and then subjected to ultra-high temperature above 3000°C obtained by graphitization.

[0053] Among them, kneading and mixing the binder, negative electro...

Embodiment approach 3

[0065] A lithium-ion battery includes a positive electrode sheet, a negative electrode sheet, a diaphragm spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte.

[0066] Wherein, the negative electrode sheet includes a negative electrode active material, a negative electrode conductive agent, a binder, and a negative electrode current collector, and the negative electrode active material is agglomerated secondary artificial graphite particles, and the D50 of the secondary artificial graphite particles is 20 μm , the specific surface area is 1.7m 2 / g, the compacted density is 1.70g / cm 3 ; The artificial graphite particles are coarsely crushed into particles with a particle size of 9.0±1.0 μm, then coated with amorphous carbon with a percentage of 25%, and agglomerated into secondary particles, and then heated at 3000 ° C The above ultra-high temperature graphitization is obtained.

[0067] Among them, kneading and mixing the binder,...

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Abstract

The invention belongs to the technical field of lithium ion batteries and discloses a lithium ion battery. The lithium ion battery comprises a cathode piece, an anode piece, a diaphragm arranged between the cathode piece and anode piece, and an electrolyte; the anode piece comprises an anode active material, an anode conductive agent, a binder and an anode current collector; the anode active material is formed by use of agglomerated secondary artificial graphite particles; the particle D50 of the secondary artificial graphite particles is 21.0+ / -3.0 microns, the specific surface area of the particles is 1.5+ / -0.4m<2> / g, and the compaction density of the particles is 1.65-1.80g / cm<3>; the anode active material is obtained by use of the following steps: preforming coarse crushing on needle coke to form particles having the grain size of 4.5-11.5 microns, and homogeneously coating the particles with a homogeneous coating material in the percentage of 10-40% and agglomerating into secondary particles, and then preforming ultrahigh temperature graphitization at temperature above 3000 DEC. According to the lithium ion battery, rapid charging of the battery can be realized, and excellent low-temperature charge-discharge properties also are achieved, and consequently, the battery is capable of working normally in a low-temperature environment.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery. Background technique [0002] Lithium-ion battery is a new type of high-energy battery successfully developed in the 20th century. Lithium-ion research began in the 1980s, entered the stage of industrialization in the 1990s, and developed rapidly. Lithium-ion batteries are favored by various industries due to their high specific energy, small size, and environmental friendliness, and are widely used in digital products such as mobile phones and notebook computers. [0003] The functions of today's digital products are becoming more and more diversified. The screens are getting bigger and bigger, and the power consumption is getting faster and faster. The requirements for the battery life of lithium-ion batteries are getting higher and higher. For example, the current smart phones basically need to be charged once a day, and it ta...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/587
CPCH01M4/366H01M4/583H01M4/625H01M10/0525H01M10/058Y02E60/10
Inventor 叶柏青刘剑光吕坤王培培李洁
Owner SHENZHEN MEIBAI ELECTRONIC CO LTD
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