Electrolyte solution for lithium titanate battery and lithium titanate battery thereof

A lithium titanate battery and electrolyte technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of easy flatulence of batteries, poor high and low temperature performance, etc., to improve stability, improve high temperature resistance, and improve lubrication Effects of Wetting and Pour Performance

Active Publication Date: 2015-07-01
启东市滨化供水有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, it has been found that batteries with lithium titanate as the negative electrode tend to swell at

Method used

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Examples

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Effect test

Embodiment 1

[0015] The lithium titanate battery of the present invention comprises positive electrode material, negative electrode material and electrolytic solution, and described negative electrode material is lithium titanate, and described electrolytic solution comprises lithium salt, organic solvent and additive, and described lithium salt is lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ) and lithium bistrifluoromethanesulfonyl imide (LiN(CF 3 SO 2 ) 2 ) in a ratio of 5:1:1, the organic solvent is a mixture of chain carbonate organic solvents, cyclic carbonate organic solvents, and carboxylate organic solvents in a ratio of 1:1:1, The additive is composed of the following components based on the total weight of the electrolyte: 1.5% dimethyl carbonate, 0.05% ethylene carbonate, 0.15-% LiBOB, 0.1% vinylene carbonate (VO), 0.07% crown ether, 0.04% LiF, 0.05% fluoroethylene carbonate, 0.05% cyclohexylbenzene, 0.1% biphenyl and 0.1% 1,3-propane sultone.

Embodiment 2

[0017] The lithium titanate battery of the present invention comprises positive electrode material, negative electrode material and electrolytic solution, and described negative electrode material is lithium titanate, and described electrolytic solution comprises lithium salt, organic solvent and additive, and described lithium salt is lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ) and lithium bistrifluoromethanesulfonyl imide (LiN(CF 3 SO 2 ) 2 ) in a ratio of 5:1:1, the organic solvent is a mixture of chain carbonate organic solvents, cyclic carbonate organic solvents, and carboxylate organic solvents in a ratio of 1:1:1, The additive is composed of the following components based on the total weight of the electrolyte: 3.5% dimethyl carbonate, 0.25% ethylene carbonate, 0.35% LiBOB, 0.45% vinylene carbonate (VO), 0.35% Crown ether, 0.06% LiF, 0.065% fluoroethylene carbonate, 0.25% cyclohexylbenzene, 0.45% biphenyl and 0.45% 1,3-propane sultone. ...

Embodiment 3

[0019] The lithium titanate battery of the present invention comprises positive electrode material, negative electrode material and electrolytic solution, and described negative electrode material is lithium titanate, and described electrolytic solution comprises lithium salt, organic solvent and additive, and described lithium salt is lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ) and lithium bistrifluoromethanesulfonyl imide (LiN(CF 3 SO 2 ) 2 ) in a ratio of 5:1:1, the organic solvent is a mixture of chain carbonate organic solvents, cyclic carbonate organic solvents, and carboxylate organic solvents in a ratio of 1:1:1, The additive is composed of the following components based on the total weight of the electrolyte: 2.5% dimethyl carbonate, 0.15% ethylene carbonate, 0.25% LiBOB, 0.275% vinylene carbonate (VO), 0.21% Crown ether, 0.05% LiF, 0.035% fluoroethylene carbonate, 0.015% cyclohexylbenzene, 0.275% biphenyl and 0.275% 1,3-propane sulto...

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Abstract

The invention discloses an electrolyte solution for a lithium titanate battery and the lithium titanate battery thereof. The electrolyte solution for the lithium titanate battery comprises lithium salt, organic solvent and additive, wherein the additive is formed by the following ingredients through adopting the total weight of the electrolyte solution as the standard: 1.5-3.5 percent of dimethyl carbonate, 0.05-0.25 percent of ethylene carbonate, 0.15-0.35 percent of LiBOB, 0.1-0.45 percent of vinylene carbonate, 0.07-0.35 percent of crown ether, 0.04-0.06 percent of LiF, 0.05-0.065 percent of monofluoro ethylene carbonate, 0.05-0.25 percent of phenylcyclohexane, 0.1-0.45 percent of biphenyl, and 0.1-0.45 percent of 1,3-propane sultone. According to the electrolyte solution for the lithium titanate battery, the stability of a high-temperature SEI film under high temperature is improved, the resistance to high temperature of the electrolyte solution is improved, the cycle performance is excellent, the service life is prolonged, and meanwhile, the high-and-low temperature performance and the flame retardant property are improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an electrolyte solution for a lithium titanate battery and the lithium titanate battery. Background technique [0002] At present, most commercial lithium-ion battery anode materials are lithium-intercalated carbon materials. Since the potential of the carbon electrode after lithium intercalation is very close to that of metal lithium, when the battery is overcharged, metal lithium is easily precipitated on the surface of the carbon electrode, and it interacts with the electrolyte. The reaction produces a flammable gas mixture, thus causing a great safety hazard to the battery, especially the power battery. At the same time, the graphite electrode also has the problem of co-intercalation of the electrolyte, which will also affect the cycle stability of the electrode. Therefore, it is necessary to find new anode materials that can intercalate lithium at a slightly positive potential than...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M4/485H01M10/0525H01M10/0567Y02E60/10
Inventor 颜雪冬曹长河马伟华
Owner 启东市滨化供水有限公司
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