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High-performance rate type lithium ion battery and preparation method thereof

A lithium-ion battery, high-performance technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of insufficient charging and discharging capacity of lithium-ion batteries, and achieve high-current charging and discharging performance. The effect of high conductivity

Inactive Publication Date: 2020-12-01
珠海新视扬能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of insufficient charging and discharging capacity of existing lithium-ion batteries, the present invention provides a high-performance rate-type lithium-ion battery and its preparation method

Method used

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  • High-performance rate type lithium ion battery and preparation method thereof
  • High-performance rate type lithium ion battery and preparation method thereof
  • High-performance rate type lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A lithium-ion battery with high rate performance described in this embodiment uses lithium cobaltate as the positive electrode active material, the gram specific capacity of lithium cobaltate is 142mAh / g, and the initial efficiency is 94%; the mesophase carbon microspheres are used as the negative electrode material , the gram specific capacity is 343mAh / g, and the first efficiency is 92%. The production process is as follows:

[0024] 1) Positive electrode sheet production: first configure polyvinylidene fluoride (1.5wt%) and solvent N-methylpyrrolidone into a glue solution with a solid content of 7.0wt%, then add 1.0wt% superconducting carbon black conductive agent + 1.5wt % The carbon nanotube conductive agent is well dispersed, and finally add 96wt% lithium cobaltate, mix it into a slurry, adjust the viscosity, and then coat a double-segment gap pole piece on a 0.014mm aluminum foil, with a density of 240g / m on both sides 2 , and rolled and cut to obtain the positiv...

Embodiment 2

[0032] A lithium-ion battery with high rate performance described in this embodiment 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 97%; the mesophase carbon microspheres are used as the negative electrode material , the gram specific capacity is 345mAh / g, and the first efficiency is 95%. The production process is as follows:

[0033] Positive pole sheet production: first configure polyvinylidene fluoride (2.0wt%) and solvent N-methylpyrrolidone into a glue solution with a solid content of 8.5wt%, then add 2.0wt% superconducting carbon black conductive agent+0.6wt% carbon The nanotube conductive agent is well dispersed, and finally add 95.4wt% lithium cobaltate, mix it into a slurry, adjust the viscosity, and then coat a double-segment gap pole piece on a 0.014mm aluminum foil, with a double-sided density of 240g / m 2 , and rolled and cut to obtain the positive el...

Embodiment 3

[0041] A kind of high-rate performance lithium-ion battery described in this embodiment uses lithium cobalt oxide as the positive electrode active material, and the gram specific capacity of lithium cobalt oxide is 140mAh / g, and the initial efficiency is 92%; Use mesophase carbon microspheres as the negative electrode material , the gram specific capacity is 340mAh / g, and the first efficiency is 90%. The production process is as follows:

[0042]Positive electrode sheet production: first configure polyvinylidene fluoride (1.0wt%) and solvent N-methylpyrrolidone into a glue solution with a solid content of 8.5wt%, and then add 0.5wt% superconducting carbon black conductive agent + 1.0wt% carbon The nanotube conductive agent is well dispersed, and finally add 97.5wt% lithium cobaltate, mix it into a slurry, adjust the viscosity, and then coat a double-segment gap pole piece on a 0.014mm aluminum foil, with a density of 240g / m on both sides 2 , and rolled and cut to obtain the po...

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Abstract

The invention discloses a high-performance rate type lithium ion battery and a preparation method thereof and belongs to the battery field. The high-performance rate type lithium ion battery comprisesa positive pole piece and a negative pole piece; the positive pole piece comprises rate type lithium cobalt oxide, the gram specific capacity of the rate type lithium cobalt oxide is 140-145 mAh / g, the first efficiency of the rate type lithium cobalt oxide is 92-97%, the double-sided surface density of the rate type lithium cobalt oxide is 240-260 g / m <2>, and the positive pole compaction densityof the rate type lithium cobalt oxide is 3.55-3.70 g / cm <3>; the negative pole piece comprises rate type intermediate carbon microspheres, the gram specific capacity of the rate type intermediate carbon microspheres is 340-345mAh / g, the first efficiency of the rate type intermediate carbon microspheres is 90%-95%, and the negative pole compaction density of the rate type intermediate carbon microspheres is 1.50-1.60 g / cm <3>; and the surface density of the negative pole piece is 6%-10% of the excess ratio of a corresponding positive pole active substance; by adopting the positive electrode material system and negative electrode material system with high rate capability and adopting proper proportions, surface density and compaction density, the high conductivity of the pole pieces is ensured, and the high-current charging and discharging performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a high-performance rate-type lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries embed lithium ions in carbon (petroleum coke and graphite) to form negative electrodes (traditional lithium batteries use lithium or lithium alloys as negative electrodes). Cathode materials commonly used Li x CoO2, also with Li x NiO 2 , and Li x MnO 4 , The electrolyte uses LiPF6+diethylene carbonate (EC)+dimethyl carbonate (DMC). [0003] Petroleum coke and graphite are non-toxic and abundant resources as negative electrode materials. Lithium ions are embedded in carbon, which overcomes the high activity of lithium and solves the safety problems of traditional lithium batteries. The positive electrode Li x CoO2 can reach a higher level in charge and discharge performance and life, which reduces the cost. [0004] Due to the problems of its prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/583H01M10/0525H01M10/058
CPCH01M4/525H01M4/583H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 戴逢先王振魏艺芳
Owner 珠海新视扬能源科技有限公司