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Electrolyte system for preventing spinel lithium titanate radical lithium ion secondary battery from flatulence

A lithium titanate, secondary battery technology, applied in the field of batteries, can solve the problems of difficult formation of SEI film, affecting battery life, etc., and achieve the effects of improving cycle life, preventing flatulence, and improving stability

Inactive Publication Date: 2013-01-09
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is precisely because the discharge voltage is higher than the decomposition potential of the organic electrolytic system, so it is not easy to form a stable SEI film on the surface of the negative electrode material.
This also makes the battery flat due to the side reaction between the electrode material and the electrolyte during the charging, discharging and storage process, which affects the battery life.

Method used

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  • Electrolyte system for preventing spinel lithium titanate radical lithium ion secondary battery from flatulence
  • Electrolyte system for preventing spinel lithium titanate radical lithium ion secondary battery from flatulence
  • Electrolyte system for preventing spinel lithium titanate radical lithium ion secondary battery from flatulence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Li / Li 4 Ti 5 o 12 The system simulates the battery, the specific process is as follows:

[0022] Weigh Li respectively according to weight percentage 8:1:1 4 Ti 5 o 12 , acetylene black and polyvinylidene fluoride (PVDF), using pyrrolidone as a dispersant, stir and mix them evenly. Using aluminum foil as a current collector, the mixed slurry was rolled into a pole piece with a thickness of 50 μm by a rolling machine. The electrolyte uses organic electrolytes EC (ethylene carbonate) and DEC (diethyl carbonate), EC:DEC=1:1, and the electrolyte is 1mol / L LiBF 4 5 wt% lithium bisoxalate borate (LiBOB) is added into the system as a film-forming additive, and the water content of the obtained electrolytic solution is lower than 10 ppm.

Embodiment 2-6

[0024] Weigh a certain amount of Li according to the weight percentage 8:1:1 4 Ti 5 o 12 , acetylene black and polyvinylidene fluoride (PVDF), using pyrrolidone as a dispersant, stir and mix them evenly. Using aluminum foil as a current collector, the mixed slurry was rolled into a pole piece with a thickness of 50 μm by a rolling machine.

[0025] As described in Example 1, the film-forming additives are respectively 0.001wt%, 1wt%, 3wt% and 10wt%, 30wt%, the organic electrolyte solvent is PC (propylene carbonate), and the electrolyte is 1mol / L LiPF 6 , The water content of the obtained electrolyte is lower than 10ppm.

Embodiment 7-42

[0027] Li / Li 4 Ti 5 o 12 The system simulates the battery, the specific process is as follows:

[0028] Weigh a certain amount of Li according to the weight percentage 8:1:1 4 Ti 5 o 12 , acetylene black and polyvinylidene fluoride (PVDF), using pyrrolidone as a dispersant, stir and mix them evenly. Using aluminum foil as a current collector, the mixed slurry was rolled into a pole piece with a thickness of 50 μm by a rolling machine.

[0029] As described in Example 1, the film-forming additives are sequentially used bis(2,3-naphthalenediol)lithium borate (LBNB), bis(2,2'-biphenyldioxy)lithium borate (LBBPB), di Lithium (salicylic acid) borate (LBSB), lithium bis(2,3-pyridyldioxy)borate (LBPB), malonate oxalate borate (LiMOB), lithium bis(catechol)borate (LBBB) ) instead, the additions are respectively: 0.001wt%, 1wt%, 3wt% and 10wt%, 30wt%, the electrolyte adopts organic electrolyte EC and DMC (dimethyl carbonate), EC: DMC=1: 1, electrolyte 1mol / L LiBF 4 , The water...

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Abstract

The invention discloses an electrolyte system for preventing a spinel lithium titanate radical lithium ion secondary battery from flatulence. An additive is added into the organic electrolyte system; the additive forms a layer of solid electrolyte interface film on the surface of a Li4Ti5O12 electrode in the battery cyclic process due to the reduction reaction of the organic electrolyte system, so as to prevent a lithium titanate electrode from direct contact with the organic electrolyte, thus the flatulence is prevented; the additive consists of one or more of organic lithium borate salt or boron radical compound as negative iron accepter; and the addition amount of the additive is 0.001-30 wt% of the total electrolyte system. The electrolyte system disclosed by the invention adopts the organic lithium borate salt as the film forming additive of the organic electrolyte, forms a layer of stable SEI (solid electrolyte interface) film on the surface of an active material in the battery cyclic process due to the reduction reaction of the organic electrolyte system, thus the flatulence generation phenomena due to the side reaction of the electrolyte and the active material is prevented, and the cyclic life of the battery is improved.

Description

technical field [0001] The invention belongs to the field of battery technology. In particular, it relates to an electrolytic solution system used for preventing flatulence of negative electrode material lithium titanate or modified lithium titanate during circulation and storage. It has broad application prospects in the fields of common secondary lithium ion batteries, power energy batteries and energy storage batteries. Background technique [0002] Due to its high working voltage, high energy density, long cycle life, no memory effect, no pollution, and small self-discharge, lithium-ion batteries have been highly praised since their invention, and have been widely used in mobile phones, notebook computers, and cameras. portable appliances. With the miniaturization and portability of electronic equipment, and the emergence and vigorous development of green and environmentally friendly electric vehicles, the lithium-ion battery application market continues to expand. In ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 索鎏敏胡勇胜李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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