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A high safety lithium titanate battery

A lithium titanate battery, safety performance technology, applied in the direction of secondary batteries, battery pack components, secondary battery gas removal, etc., can solve the problem of affecting battery cycle performance and rate performance, insufficient mechanical strength of the diaphragm, difficult to achieve Complete coverage and other issues, to achieve the effect of not being flatulent, improving safety performance, and improving safety performance

Active Publication Date: 2018-05-18
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the above method can suppress the generation of gas by coating lithium titanate to a certain extent, but because it is difficult to achieve complete coating, it cannot fundamentally solve this problem, and the oxide Lithium ion conductivity is small, which affects the cycle performance and rate performance of the battery
[0005] In addition, when the temperature inside the lithium-ion battery rises, the temperature resistance of the diaphragm of the existing battery is relatively lacking. After the battery is squeezed, the mechanical strength of the diaphragm is not enough and it is easy to be pierced. When the above situation occurs, the diaphragm is destroyed. It is easy to cause a short circuit of the battery and cause a safety accident

Method used

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  • A high safety lithium titanate battery

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Effect test

Embodiment 1

[0029] A lithium titanate battery with a capacity of 20Ah, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and an aluminum-plastic film outer packaging.

[0030] The active material on the positive electrode sheet is a ternary material, the active material on the negative electrode sheet is lithium titanate, the solvent of the electrolyte is organic carbonate, the electrolyte contains lithium salt, and the electrolyte also contains cyanide chains The mass fraction of the cyanided chain carbonate in the electrolyte is 1.5 wt%, and the mass fraction of the gas scavenger in the electrolyte is 0.75 wt%. The diaphragm has a thickness of 35 microns, a porosity of 45%, and an air permeability of 35 cm 3 / sec non-woven fabric, the diaphragm material is a composite material of polypropylene, halloysite particles, and carboxymethyl cellulose fibers, and the composition content is as follows:

[0031] Polypropylene 80wt%,

[0032] Carboxym...

Embodiment 2

[0042] A lithium titanate battery with a capacity of 20Ah, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and an aluminum-plastic film outer packaging.

[0043] The active material on the positive electrode sheet is a ternary material, the active material on the negative electrode sheet is lithium titanate, the solvent of the electrolyte is an organic carbonate, the electrolyte contains a lithium salt, and the electrolyte also contains a cyanide ring Like carbonate, the mass fraction of cyanide cyclic carbonate in the electrolytic solution is 2wt%, and the mass fraction of the gas eliminating agent in the electrolytic solution is 1wt%. The diaphragm has a thickness of 50 microns, a porosity of 30%, and an air permeability of 20 cm 3 / sec microporous film, the diaphragm material is a composite material of polyethylene, halloysite particles, and carboxymethyl cellulose fibers, and the composition content is as follows:

[0044] Po...

Embodiment 3

[0055]A lithium titanate battery with a capacity of 20Ah, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and an aluminum-plastic film outer packaging.

[0056] The active material on the positive electrode sheet is a ternary material, the active material on the negative electrode sheet is lithium titanate, the solvent of the electrolyte is an organic carbonate, the electrolyte contains a lithium salt, and the electrolyte also contains a cyanide ring Like carbonate, the mass fraction of cyanide cyclic carbonate in the electrolytic solution is 1 wt%, and the mass fraction of the gas eliminating agent in the electrolytic solution is 0.5 wt%. The diaphragm has a thickness of 20 microns, a porosity of 55%, and an air permeability of 50 cm 3 / sec non-woven fabric, the diaphragm material is a composite material of polypropylene, halloysite particles, and carboxymethyl cellulose fibers, and the composition content is as follows:

[0057...

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Abstract

The present invention relates to the technical field of lithium ion batteries. In order to solve the problem of low safety performance of existing lithium titanate batteries, the present invention provides a lithium titanate battery with high safety performance: including a positive electrode sheet, a negative electrode sheet, a diaphragm, and an electrolyte and outer packaging, the active material on the positive electrode sheet is a ternary material, the active material on the negative electrode sheet is lithium titanate, the solvent of the electrolyte is organic carbonate, the electrolyte contains lithium salt, and the electrolyte It also contains electrolyte additive and gas eliminating agent, the electrolyte additive contains one or more of cyanide chain carbonate or cyanide cyclic carbonate, and the diaphragm is a microporous film diaphragm or a non-woven The cloth diaphragm is made of polyolefin compounded with halloysite particles and carboxymethyl cellulose fibers. In the present invention, the lithium titanate battery is not easy to produce flatulence, and the diaphragm has good temperature resistance and mechanical properties, is not easily damaged, and has good safety. The present invention is suitable for use as a power battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a battery with high safety performance using lithium titanate as a negative electrode material. Background technique [0002] At present, most commercial lithium-ion battery anode materials use various lithium-intercalated carbons and graphites. However, carbon-containing negative electrode materials have some disadvantages, such as the formation of a passivation film on the surface during the first cycle, which greatly consumes lithium ions in the positive electrode material, resulting in a large capacity loss; the potential of the carbon negative electrode is very close to that of lithium. Nearly, when the battery is overcharged, metal lithium may precipitate on the surface of the carbon electrode and cause safety problems; the speed of releasing energy is not fast enough, and it is not suitable for devices that require instantaneous high current. Lithium titaniu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M2/16H01M10/0525H01M10/52H01M10/44H01M50/446
CPCY02E60/10
Inventor 杜小红
Owner WANXIANG 123 CO LTD
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