Electrolyte for lithium titanate battery and battery product prepared from electrolyte

A lithium titanate battery and electrolyte technology, which is applied in the direction of secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems affecting battery cycle and safety performance, large specific surface area of ​​lithium titanate, and easy flatulence of batteries, etc., to achieve Conducive to widespread application, good high-temperature storage performance and cycle performance, and the effect of reducing gas production

Inactive Publication Date: 2017-01-04
东莞市航盛新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the lithium titanate battery has the following defects: the battery is easy to swell during high temperature storage and cycle, which affects the cycle and safety performance of the battery
The reasons are as follows: 1. Lithium titanate has a large specific surface area and is easy to absorb water; 2. Lithium titanat...

Method used

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  • Electrolyte for lithium titanate battery and battery product prepared from electrolyte
  • Electrolyte for lithium titanate battery and battery product prepared from electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: A kind of electrolyte solution for lithium titanate battery provided in this embodiment, it is formed by mixing solute, solvent and additive, and described additive is alkyl phosphoric anhydride, and the structural formula of this alkyl phosphoric anhydride is as follows:

[0025]

[0026] Wherein the alkyl group R is a C1-C5 alkyl group, and the mass percent content of the alkyl phosphoric anhydride in the lithium titanate battery electrolyte is 0.1%.

[0027] Preferably, the solvent is ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), methyl propyl carbonate (MPC), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), butyl A combination of one or more of methyl butyrate (MB), ethyl butyrate (EB), γ-butyrolactone (GBL), acetonitrile (CH3CN), and tetrahydrofuran (THF).

[0028] The solute is l...

Embodiment 2

[0032] Embodiment 2: a kind of electrolyte solution for lithium titanate battery and its battery products provided by this embodiment, it is basically the same as embodiment 1, the difference is that the mass of the alkyl phosphoric anhydride in the electrolyte solution for lithium titanate battery Min content is 0.2%.

Embodiment 3

[0033] Embodiment 3: a kind of lithium titanate battery electrolyte and its battery products provided by this embodiment, it is basically the same as embodiment 1, the difference is that the quality of the alkyl phosphoric anhydride in the lithium titanate battery electrolyte Min content is 0.3%.

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Abstract

The invention discloses an electrolyte for a lithium titanate battery and a battery product prepared from the electrolyte. The electrolyte is prepared from solutes, a solvent and an additive through mixing, wherein the additive is alkyl phosphoric anhydride, and alkyl phosphoric anhydride accounts for 0.1%-10% of the electrolyte for the lithium titanate battery in percentage by mass. The formula of the electrolyte for the lithium titanate battery is ingenious in design, alkyl phosphoric anhydride is added reasonably, the content of alkyl phosphoric anhydride is set scientifically, alkyl phosphoric anhydride can react with water of a lithium titanate pole piece to consume water, furthermore, acidity of produced alkyl phosphonic acid is low, positive and negative poles of the battery cannot be damaged, so that the gas production rate is reduced, expansion of the battery during high-temperature storage is greatly reduced, the high-temperature cycle life of the lithium titanate battery is prolonged, and better high-temperature storage property and cycle performance are realized; the battery product prepared from the electrolyte for the lithium titanate battery is simple in structure and easy to produce and has the better high-temperature storage property and cycle performance and good combination property, and wide popularization and application are facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium titanate batteries, and in particular relates to an electrolyte solution for lithium titanate batteries and battery products thereof. Background technique [0002] Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion secondary batteries have higher operating voltage, cycle life and specific energy, and have been widely used. Compared with graphite negative electrode, lithium titanate negative electrode has longer cycle life, low temperature, large rate and safety. The main manifestations are as follows: [0003] 1. Lithium titanate is a zero-strain material, which hardly changes in volume when fully charged and fully discharged, and has a longer cycle life. [0004] 2. The potential of lithium titanate relative to lithium is about 1.55V, which is much higher than the potential of lithium analysis, so there will be no safety problems caused by gr...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 林建田秀丽黄继宏
Owner 东莞市航盛新能源材料有限公司
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