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Lithium ion battery and method for achieving rapid charge of same

A lithium-ion battery, fast charging technology, applied in secondary battery charging/discharging, battery electrodes, secondary batteries, etc., can solve problems such as poor conductivity and affect performance, and achieve improved conductivity, good crystallization, and long cycle life. Effect

Inactive Publication Date: 2017-07-07
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Li 4 Ti 5 o 12 The disadvantage of the negative electrode material is poor conductivity, which affects its performance

Method used

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  • Lithium ion battery and method for achieving rapid charge of same
  • Lithium ion battery and method for achieving rapid charge of same
  • Lithium ion battery and method for achieving rapid charge of same

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Embodiments of the present invention provide a modified Li 4 Ti 5 o 12 Negative electrode material is prepared by the following method: take a certain amount of lithium acetate (5% excess) (Lithium acetate) and nano titanium dioxide (Titanium oxide) respectively according to the stoichiometric ratio and weigh a little sucrose (the final carbon content is about 5wt%) (Sucrose) and copper sulfate (final copper content about 5wt%) (Coppersulfate) were dissolved in the prepared 30ml dispersion, wherein the dispersion contained 0.05g carboxymethylcellulose (CMC), 3 drops of styrene-butadiene rubber (SBR ) and 0.1154 g polyethylene glycol 400 (PEG400). Then ball milled in agate jar for 10h. Then spray drying (180°C, 3R / min, 60HZ) to obtain a powder, and the obtained dry powder was calcined at 850°C for 12h under an argon atmosphere (heating rate 5°C / min) to finally obtain Li 4 Ti 5 o 12 / C-Cu material.

Embodiment 2

[0049] Embodiments of the present invention provide a modified Li 4 Ti 5 o 12 The negative electrode material is prepared in the following way: take a certain amount of lithium acetate (excessive 5%) (Lithium acetate), nano titanium dioxide (Titanium oxide) and weigh a little sucrose (5wt%) (Sucrose) and Silver nitrate (final silver content about 5wt%) (Silver nitrate) was dissolved in the prepared 30ml dispersion liquid, wherein, the dispersion liquid contained 0.05g carboxymethylcellulose (CMC), 3 drops of styrene-butadiene rubber (SBR) and 0.1154 g polyethylene glycol 400 (PEG400). Then ball milled in agate jar for 10h. Then spray drying (180°C, 3R / min, 60HZ) to obtain a powder, and the obtained dry powder was calcined at 850°C for 12h under an argon atmosphere (heating rate 5°C / min) to finally obtain Li 4 Ti 5 o 12 / C-Ag material.

Embodiment 3

[0051] The embodiment of the present invention provides a lithium ion battery, which is prepared by the following method: the positive electrode active material LiMn 2 o 4 , Conductive carbon black and binder (PVDF) are mixed in N-methylpyrrolidone according to the mass ratio of 95:2:3 to make a slurry, which is coated on a 15um thick current collector aluminum foil through a coating machine. Vacuum dried for 24 hours, then pressed into a 90um thick pole piece, and finally die-cut into a 98mm×194mm positive pole piece, each positive pole contains 7.6gLiMn 2 o 4 .

[0052] With the Li that embodiment 1 makes 4 Ti 5 o 12 / C-Cu material, conductive carbon black and binder (PVDF) are mixed in N-methylpyrrolidone according to the mass ratio of 93:3:3 to make a slurry, which is coated on a 15um thick current collector aluminum foil by a coating machine , vacuum-dried at 120°C for 24 hours, then pressed into 140um thick pole pieces, cut into 101mm×198mm negative pole pieces, an...

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Abstract

The invention provides a lithium ion battery and a method for achieving rapid charge of the same. The lithium ion battery comprises a positive electrode, a negative electrode and an electrolyte, wherein the negative electrode comprises a modified Li4Ti5O12 negative electrode material, and the Li4Ti5O12 negative electrode material is prepared according to the following method of adding a lithium salt, a titanium source, a carbon source and a metal salt into a dispersion liquid, performing drying to obtain powder after dispersion processing, and performing high-temperature solid-phase synthesis on the powder to obtain the modified Li4Ti5O12 negative electrode material. Carbon-metal joint coating is performed on a Li4Ti5O12 material by the modified Li4Ti5O12 negative electrode material, the Li4Ti5O12 negative electrode material has high conductivity and excellent electrochemical performance, and the cycle stability is greatly improved. Moreover, the invention also provides the method for achieving the rapid charge of the lithium ion battery. 8-15% of lithium ions are embedded into the negative electrode at low current density, the conductivity of the negative electrode material can be effectively improved, and the rapid charge of the battery is achieved.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a lithium ion battery and a method for realizing fast charging of the lithium ion battery. Background technique [0002] With the rapid development of the global economy, fossil fuels such as coal, oil, and natural gas, which are the main energy sources, are increasingly depleted, and environmental pollution continues to intensify. The development of new energy and renewable clean energy has become a top priority. Among many new energy technologies, energy storage has become the most critical link. Although the power lithium-ion battery is not a system for generating energy, it is playing an increasingly important role in the national economy and daily life because of its advantages such as cleanliness, safety and convenience. [0003] Compared with commercial lithium intercalation carbon, Li 4 Ti 5 o 12 The negative electrode material has small crystal volume change...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525H01M10/44
CPCH01M4/366H01M4/485H01M4/62H01M4/625H01M4/626H01M10/0525H01M10/446Y02E60/10
Inventor 路密
Owner XIAMEN UNIV OF TECH
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