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A kind of fast charging lithium titanate battery and preparation method thereof

A fast-charging lithium titanate battery technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as poor cycle performance and rate performance, inability to meet the needs of fast charging, long charging time, etc., to achieve Effects of increasing rate performance, improving electrical conductivity, and preventing active material from collapsing

Inactive Publication Date: 2020-06-19
CHONGQING VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this battery system cannot meet the needs of fast charging, the charging time is long, and there are certain safety hazards. Therefore, the development of lithium titanate fast charging battery technology is a good direction
At present, commercialized lithium-ion batteries generally have the defects of poor cycle performance and rate performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A fast-charging lithium titanate battery consists of a positive electrode, a negative electrode, a diaphragm, an electrolyte and an aluminum-plastic film. The positive electrode includes a positive electrode carbon-coated aluminum foil collector and a positive electrode material coated on the positive electrode carbon-coated aluminum foil collector. The negative electrode includes Negative electrode carbon-coated aluminum foil current collector and the negative electrode material coated on the negative electrode carbon-coated aluminum foil current collector; the positive electrode material is composed of the following mass percentages:

[0032] 89% LiNi 0.33 co 0.33 mn 0.33 o 2 , 5% positive electrode binder, 5% positive electrode conductive agent, 1% silica airgel;

[0033] The negative electrode material consists of the following mass percentages:

[0034] 89% lithium titanate, 0.5% lignosulfonate, 5.25% negative electrode binder, 5.25% negative electrode conducti...

Embodiment 2

[0037] A fast-charging lithium titanate battery consists of a positive electrode, a negative electrode, a diaphragm, an electrolyte and an aluminum-plastic film. The positive electrode includes a positive electrode carbon-coated aluminum foil collector and a positive electrode material coated on the positive electrode carbon-coated aluminum foil collector. The negative electrode includes Negative electrode carbon-coated aluminum foil current collector and the negative electrode material coated on the negative electrode carbon-coated aluminum foil current collector; the positive electrode material is composed of the following mass percentages:

[0038] 84% LiNi 0.33 co 0.33 mn 0.33 o 2 , 5.5% positive electrode binder, 5.5% positive electrode conductive agent, 5% silica airgel;

[0039] The negative electrode material consists of the following mass percentages:

[0040] 84% lithium titanate, 0.75% lignosulfonate, 7.625% negative electrode binder, 7.625% negative electrode c...

Embodiment 3

[0043] A fast-charging lithium titanate battery consists of a positive electrode, a negative electrode, a diaphragm, an electrolyte and an aluminum-plastic film. The positive electrode includes a positive electrode carbon-coated aluminum foil collector and a positive electrode material coated on the positive electrode carbon-coated aluminum foil collector. The negative electrode includes Negative electrode carbon-coated aluminum foil current collector and the negative electrode material coated on the negative electrode carbon-coated aluminum foil current collector; the positive electrode material is composed of the following mass percentages:

[0044] 90% LiNi 0.33 co 0.33 mn 0.33 o 2 , 4% positive electrode binder, 4% positive electrode conductive agent, 2% silica airgel;

[0045] The negative electrode material consists of the following mass percentages:

[0046] 90% lithium titanate, 0.5% lignosulfonate, 4.75% negative electrode binder, 4.75% negative electrode conducti...

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Abstract

The invention discloses a fast-charging lithium titanate battery, which is composed of a positive electrode, a negative electrode, a separator, an electrolyte and an aluminum-plastic film. The positive electrode includes a positive electrode carbon-coated aluminum foil current collector and a positive electrode coated on the positive electrode carbon-coated aluminum foil current collector. The material, the negative electrode includes a negative electrode carbon-coated aluminum foil current collector and the negative electrode material coated on the negative electrode carbon-coated aluminum foil current collector; it is characterized in that: the positive electrode material is composed of the following mass percentages: 84-94% positive electrode active material, 3% ~9% positive electrode binder, 3%~9% positive electrode conductive agent, 1%~6% silica airgel; the negative electrode material is composed of the following mass percentage: 84~94% negative electrode active material, 0.25%-0.75% lignosulfonate, 3%-9% negative electrode binder, 3%-9% negative electrode conductive agent. The lithium titanate battery obtained in the invention has better cycle performance and rate performance.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a fast-charging lithium titanate battery and a preparation method thereof. Background technique [0002] At present, the energy crisis has become the most serious problem in the 21st century, and it has become an inevitable development trend that non-renewable fossil energy will be replaced by green energy. Lithium-ion batteries have the advantages of high energy density, long cycle life, and environmental protection, and have occupied an important position in the energy storage device market. [0003] At present, the mainstream market for lithium batteries is ternary and lithium iron phosphate batteries. The ternary battery has high energy density and strong battery life, and it is an area of ​​national key support and development. However, this battery system cannot meet the needs of fast charging, the charging time is long, and there are certain safety hazards. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/66H01M10/0525H01M2/16H01M4/04H01M4/1391H01M50/411
CPCH01M4/0435H01M4/1391H01M4/505H01M4/525H01M4/62H01M4/623H01M4/625H01M4/661H01M10/0525H01M50/411Y02E60/10
Inventor 郭亚琴
Owner CHONGQING VOCATIONAL INST OF ENG
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