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Lithium titanate negative electrode plate and preparation method thereof

A technology of negative pole piece and lithium titanate, which is applied to battery electrodes, electrode carriers/current collectors, structural parts, etc., can solve the problems of limited improvement of battery performance and poor coating performance of lithium titanate negative pole piece, etc. Coating uniformity, improved bonding effect, overall performance improvement effect

Active Publication Date: 2016-04-06
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of poor coating performance of the lithium titanate negative electrode sheet in the prior art and limited improvement of the performance of the battery, and provides a battery that can improve the cycle performance of the battery rate, reduce the DC internal resistance of the battery discharge, and improve the low temperature of the battery. Lithium titanate negative electrode sheet with power characteristics

Method used

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  • Lithium titanate negative electrode plate and preparation method thereof

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Embodiment 1

[0024] A lithium titanate negative electrode sheet, comprising a negative electrode current collector and a negative electrode material coated on the surface of the negative electrode current collector, the negative electrode current collector is a carbon-coated aluminum foil with double-sided carbon-coated layers, and the thickness of one side of the carbon-coated aluminum foil is carbon-coated is 1.5 μm, the negative electrode material is composed of the following components by mass percentage: 2% conductive agent, 8% binder, 90% lithium titanate, and the compacted density of the negative electrode material is 2g / cm 3 , wherein the conductive agent is one or more of conductive carbon black, carbon nanotubes, graphite flakes, and vapor-phase grown carbon fibers, and the binder is polyvinylidene fluoride, polyamide or polyacrylic acid.

[0025] The lithium titanate negative electrode sheet is prepared by the following method:

[0026] (1) After weighing lithium titanate, condu...

Embodiment 2

[0030] A lithium titanate negative electrode sheet, comprising a negative electrode current collector and a negative electrode material coated on the surface of the negative electrode current collector, the negative electrode current collector is a carbon-coated aluminum foil with double-sided carbon-coated layers, and the thickness of one side of the carbon-coated aluminum foil is carbon-coated The negative electrode material is composed of the following components in mass percentage: 7% conductive agent, 6% binder, 87% lithium titanate, and the compacted density of the negative electrode material is 2.1g / cm 3 , wherein the conductive agent is one or more of conductive carbon black, carbon nanotubes, graphite flakes, and vapor-phase grown carbon fibers, and the binder is polyvinylidene fluoride, polyamide or polyacrylic acid.

[0031] The lithium titanate negative electrode sheet is prepared by the following method:

[0032] (1) After weighing lithium titanate, conductive age...

Embodiment 3

[0036] A lithium titanate negative electrode sheet, comprising a negative electrode current collector and a negative electrode material coated on the surface of the negative electrode current collector, the negative electrode current collector is a carbon-coated aluminum foil with double-sided carbon-coated layers, and the thickness of one side of the carbon-coated aluminum foil is carbon-coated The negative electrode material is composed of the following components in mass percentage: 3% conductive agent, 3% binder, 94% lithium titanate, and the compacted density of the negative electrode material is 2.3g / cm 3 , wherein the conductive agent is one or more of conductive carbon black, carbon nanotubes, graphite flakes, and vapor-phase grown carbon fibers, and the binder is polyvinylidene fluoride, polyamide or polyacrylic acid.

[0037] The lithium titanate negative electrode sheet is prepared by the following method:

[0038] (1) After weighing lithium titanate, conductive age...

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Abstract

The invention discloses a lithium titanate negative electrode plate, which comprises a negative current collector and a negative material, wherein the negative material coats the surface of the negative current collector. The lithium titanate negative electrode plate is characterized in that the negative current collector is a carbon-coated aluminum foil; the negative material is prepared from the following components in mass percentage: 2%-7% of a conductive agent, 3%-8% of a binder and 87%-94% of lithium titanate; the sum of the mass percentages of the components is 100%; and the compaction density of the negative material is 2-2.3 g / cm<3>. According to the lithium titanate negative electrode plate disclosed by the invention, with the carbon-coated aluminum foil as the negative current collector, the problem of poor processability of a lithium titanate material is solved; the overall performance of a battery is significantly improved; the formula of the negative material is optimized and modified; the coating performance is good; and the overall performance of the battery is ensured. The invention further discloses a preparation method of the lithium titanate negative electrode plate. The preparation method is simple in process step, high in operability and applicable to large-scale industrial production and application.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a lithium titanate negative pole piece and a preparation method thereof. Background technique [0002] Lithium-ion power battery is a new type of battery that has been recently developed and developed rapidly. Due to its special advantages such as high specific energy and environmental protection, it is widely used in many fields such as electric vehicles, energy storage systems, and military products. Since the commercial application of lithium-ion batteries in the 1990s, lithium-ion batteries have occupied more than 70% of the secondary battery market. Based on the safety performance and cycle performance requirements of lithium-ion batteries, we need to find new negative electrode materials to replace carbon materials. The lithium titanate negative electrode material is an ultrafine powder with a spinel structure, which has good cycle performance a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/485H01M4/62H01M4/66
CPCY02E60/10
Inventor 吕豪杰石先兴王慧敏高新宝陈军
Owner WANXIANG 123 CO LTD
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