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Lithium ion battery with high-rate charge-discharge performance

A charge-discharge performance, lithium-ion battery technology, applied in secondary batteries, battery electrodes, organic electrolytes, etc., can solve the problems of poor conductivity, difficult dispersion, large particle size specific surface area, etc., achieve high conductivity, increase volume The effect of energy density, buffer heat dissipation problem

Inactive Publication Date: 2015-09-09
田东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductive agents for lithium-ion batteries currently on the market are mainly Super-P and KS series. These two types of products are imported from abroad. The former is a nano-scale carbon black product with a smaller particle size and a larger specific surface area. It also has good electrical conductivity, but due to its small particle size and large specific surface area, it is not easy to disperse, and then it is micron-sized conductive graphite, which is easy to disperse, but its electrical conductivity is worse than Super-P

Method used

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  • Lithium ion battery with high-rate charge-discharge performance

Examples

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Effect test

Embodiment 1

[0023] A high rate performance lithium-ion battery described in this example uses lithium cobalt oxide as the positive electrode active material, the gram specific capacity of lithium cobalt oxide is 149mAh / g, and the first efficiency is 96.2%; the mesophase carbon microspheres are used as the negative electrode material. , the gram specific capacity is 320mAh / g, and the first efficiency is 94%.

[0024] Among them, the production of the positive pole piece is to first configure the binder PVDF (3wt%) and the solvent NMP (80wt%) into a glue solution, add graphene 2wt% to disperse well, and finally add the active material lithium cobaltate 95wt%, mix Make a slurry, adjust the viscosity, and then coat a pole piece on a 0.016mm aluminum foil with a density of 25mg / cm2 on both sides, and roll and cut to obtain a positive pole piece, with a compacted density of 1.8g / cm3;

[0025] The negative pole piece is made by first configuring 1.2wt% CMC and deionized water into a glue solutio...

Embodiment 2

[0028]The high rate performance lithium ion battery described in this example uses lithium cobalt oxide as the positive electrode active material, the gram specific capacity of lithium cobalt oxide is 145mAh / g, and the initial efficiency is 96.5%; using mesocarbon microspheres as the negative electrode material, g The specific capacity is 325mAh / g, and the first efficiency is 94.5%.

[0029] Among them, the production of the positive pole piece is to first configure the binder PVDF (2.5wt%) and the solvent NMP (80wt%) into a glue solution, add graphene 1.5wt% to disperse well, and finally add the active material lithium cobalt oxide 96wt% , mixed into a slurry, adjusted the viscosity, and then coated a pole piece on a 0.016mm aluminum foil with a double-sided surface density of 25mg / cm2, and rolled and cut to obtain a positive pole piece with a compacted density of 1.9g / cm3;

[0030] The production of the negative pole piece is to first configure 1.5wt% of CMC and deionized wa...

Embodiment 3

[0033] A high-rate performance lithium-ion battery described in this embodiment uses lithium cobalt oxide as the positive electrode active material, the gram specific capacity of lithium cobalt oxide is 150mAh / g, and the initial efficiency is 95.5%; the mesophase carbon microspheres are used as the negative electrode material. , the gram specific capacity is 320mAh / g, and the first efficiency is 94.1%.

[0034] Among them, the production of the positive pole piece is to first configure the binder PVDF (2.0wt%) and the solvent NMP (80wt%) into a glue solution, add graphene 1.0wt% to disperse well, and finally add the active material lithium cobalt oxide 97wt% , mixed into slurry, adjusted the viscosity, and then coated the pole piece on the 0.016mm aluminum foil, the double-sided surface density was 30mg / cm2, and rolled and cut to obtain the positive pole piece, the compaction density was 2.0g / cm3;

[0035] The negative pole piece is made by first configuring 1.5wt% CMC and dei...

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Abstract

The invention discloses a lithium ion battery with high-rate charge-discharge performance. According to the lithium ion battery, high-rate lithium cobalt oxide is taken as an anode, high-rate intermediate carbon microspheres are taken as a cathode, and graphene is taken as a conductive additive. Cathode and anode material systems with the high-rate properties are adopted, the surface density and the compaction density of pole pieces of the anode and the cathode are controlled, high conductivity of the pole pieces is guaranteed, and the high-current charge-discharge performance of the battery is improved. The graphene with the high conductivity is taken as the conductive additive, the defect that the proportion of active materials for the anode and the cathode is reduced due to heavy addition of a conventional conductive additive is overcome, and the volume energy density of the battery is increased. An electrolyte containing a PC (polycarbonate) solvent with a high solidifying point and high electric conductivity is adopted, so that the heat dissipation problem of the battery under the high-current charge and discharge condition is effectively solved, and the cyclic stability of the battery is further guaranteed. The lithium ion battery is simple in process, and the performance of the prepared lithium battery is excellent.

Description

technical field [0001] The invention relates to a lithium ion battery with high rate charge and discharge performance, belonging to the field of lithium ion batteries. Background technique [0002] Since Japan's Sony Corporation took the lead in developing and commercializing lithium-ion batteries in 1990, lithium-ion batteries have developed rapidly. Nowadays, lithium-ion batteries have been widely used in various fields of civil and military use. With the continuous advancement of science and technology, people have put forward more and higher requirements for the performance of batteries: the miniaturization and personalized development of electronic devices require batteries to have smaller volume and higher specific energy output; aerospace energy requirements Batteries have cycle life, better low-temperature charge-discharge performance and higher safety performance; electric vehicles require batteries with large capacity, low cost, high stability and safety performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/485H01M4/38H01M4/62H01M4/131H01M4/133H01M10/0569
CPCH01M4/131H01M4/133H01M4/38H01M4/525H01M4/625H01M10/0525H01M10/0569H01M2004/027H01M2004/028H01M2300/0028H01M4/485H01M4/62Y02E60/10
Inventor 田东
Owner 田东
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