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Anti-overcharging electrolyte based on ternary lithium ion battery and lithium ion battery

A lithium-ion battery, overcharge technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of reduced battery capacity and cycle life, large amount of additives, general protection effect, etc., to avoid adverse effects and reduce use The effect of volume and resistance increase

Inactive Publication Date: 2016-12-21
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional electrolyte formula uses a large amount of additives and the protective effect is average, and it will have a greater adverse effect on battery performance, such as reducing battery capacity and cycle life.

Method used

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  • Anti-overcharging electrolyte based on ternary lithium ion battery and lithium ion battery
  • Anti-overcharging electrolyte based on ternary lithium ion battery and lithium ion battery
  • Anti-overcharging electrolyte based on ternary lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Preparation of electrolyte: in the glove box (H 2 O99.99%) to prepare lithium-ion battery electrolyte, lithium salt lithium hexafluorophosphate (LiPF 6 ) is dissolved in a mixed solution of ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) with a volume ratio of 1:1:1, lithium hexafluorophosphate (LiPF 6 ) concentration is 1.1mol / L, and the functional additives are vinylene carbonate (VC) 2% (wt%) and propylene sulfite (PS) 2% (wt%). The overcharge additive added is cyclohexylbenzene (CHB) 1% (wt%), biphenyl (BP) 1% (wt%), p-difluorobenzene 1% (wt%), and the salt additive is lithium dioxalate borate (LiBOB) 1% (wt%). The mass of the overcharge additive accounts for 3% of the total mass of the electrolyte.

[0043] (2) Preparation of battery: use this electrolyte to prepare LiNi, a nickel-cobalt-manganese ternary material for the positive electrode 0.33 co 0.33 mn 0.33 o 2 , the negative electrode is artificial graphite, and the...

Embodiment 2

[0046] (1) Preparation of electrolyte: in the glove box (H 2 O99.99%) to prepare lithium-ion battery electrolyte, lithium salt lithium hexafluorophosphate (LiPF 6 ) dissolved in a mixed solution of ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) with a volume ratio of 1:1:1, lithium hexafluorophosphate (LiPF 6 ) concentration is 1.1mol / L, and the functional additives are vinylene carbonate (VC) 2% (wt%) and propylene sulfite (PS) 2% (wt%). The added overcharge additives are cyclohexylbenzene (CHB) 2% (wt%), biphenyl (BP) 1% (wt%), fluorobenzene 1% (wt%), salt additives are lithium dioxalate borate (LiBOB ) 0.5% (wt%). The mass of the overcharge additive accounts for 4% of the total mass of the electrolyte.

[0047] (2) Preparation of battery: use this electrolyte to prepare LiNi, a nickel-cobalt-manganese ternary material for the positive electrode 0.5 co 0.2 mn 0.3 o 2 , the negative electrode is artificial graphite, and the diaphragm ...

Embodiment 3

[0050] (1) Preparation of electrolyte: in the glove box (H 2 O99.99%) to prepare lithium-ion battery electrolyte, lithium salt lithium hexafluorophosphate (LiPF 6 ) dissolved in a mixed solution of ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) with a volume ratio of 1:1:1, lithium hexafluorophosphate (LiPF 6 ) concentration is 1.1mol / L, and the functional additives are vinylene carbonate (VC) 2% (wt%) and propylene sulfite (PS) 2% (wt%). The added overcharge additives are cyclohexylbenzene (CHB) 1.5% (wt%), biphenyl (BP) 1% (wt%), 4,4'-difluorobiphenyl 2% (wt%), salt additives It is 0.5% (wt%) of lithium dioxalate borate (LiBOB). The mass of the overcharge additive accounts for 4.5% of the total mass of the electrolyte. (2) Preparation of battery: use this electrolyte to prepare LiNi, a nickel-cobalt-manganese ternary material for the positive electrode 0.6 co 0.2 mn 0.2 o 2 , the negative electrode is artificial graphite, and the dia...

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Abstract

The invention provides an anti-overcharging electrolyte based on a ternary lithium ion battery and a lithium ion battery. The anti-overcharging electrolyte is characterized by comprising lithium salt, an organic solvent, an overcharging additive, a salt additive and a function additive, wherein the overcharging additive comprises one or more than two aromatic derivatives A and / or B, the mass of each of the derivatives A and B accounts for 0.01%-5% of the mass of the electrolyte. According to the anti-overcharging electrolyte provided by the invention, Ni-Co-Mn ternary material can be obviously improved, the overcharging performance of the battery particularly under the condition of increase of nickel content can be improved; furthermore, on the premise of improving overcharging, the usage amount of the additives is reduced to the greatest extent (less than 5%), the charging and discharging capacity cannot be affected obviously, a battery DCR is unchanged basically, and the cycling life is not shortened obviously.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an anti-overcharge electrolyte and a lithium battery of a lithium ion power battery based on a nickel-cobalt-manganese ternary positive electrode material. Background technique [0002] With the rapid development of my country's electric vehicle industry in recent years, lithium-ion power batteries, the core component of electric vehicles, have also entered a stage of rapid development. Lithium-ion batteries are considered to be the most potential future power battery system due to their obvious advantages of high specific energy and high specific power, but they also have certain safety problems, especially reports about explosions and fires of lithium-ion batteries. , which largely restricts its use in electric vehicle systems. Among many factors, overcharging is one of the common factors that cause safety problems of lithium-ion batteries. For many ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 从长杰马华冯树南李娟娟
Owner TIANJIN ENERGIES
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