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A lithium titanate composite negative pole piece and lithium titanate battery

A negative pole piece, lithium titanate technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of large internal resistance, fire, easy to produce flatulence, etc., to reduce the amount of flatulence, improve cycle performance, prevent The effect of lithium dendrites

Active Publication Date: 2020-05-29
深圳博磊达新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium titanate composite negative pole piece, so as to solve the problem that the existing lithium titanate battery has a large internal resistance and is prone to flatulence and fire

Method used

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  • A lithium titanate composite negative pole piece and lithium titanate battery
  • A lithium titanate composite negative pole piece and lithium titanate battery
  • A lithium titanate composite negative pole piece and lithium titanate battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The lithium titanate composite negative electrode sheet of this embodiment includes copper foil and a functional layer, an active material layer, and a lithium metaaluminate composite layer that are sequentially arranged on the surface of the copper foil along a direction away from the copper foil; the functional layer has a mass ratio of 82:10:8 functional material, conductive agent SP and polyvinylidene fluoride binder, the functional material is melamine cyanurate; the thickness of the functional layer is 2 μm; the mass ratio of the active material layer is 92 : 4:4 lithium titanate, conductive agent SP and polyvinylidene fluoride binder, the thickness of the active material layer is 150 μm; Lithium aluminate, conductive agent SP and polyvinylidene fluoride binder, the thickness of the lithium metaaluminate composite layer is 8 μm.

[0031] The preparation method of the above-mentioned lithium titanate composite negative electrode sheet adopts the following steps:

...

Embodiment 2

[0036]The lithium titanate composite negative electrode sheet of this embodiment includes copper foil and a functional layer, an active material layer, and a lithium metaaluminate composite layer that are sequentially arranged on the surface of the copper foil along a direction away from the copper foil; the functional layer has a mass ratio of 90:5:5 functional material, conductive agent graphene and polyvinylidene fluoride binder, the functional material is pentaerythritol phosphate melamine salt; the thickness of the functional layer is 1 μm; the mass ratio of the active material layer is Composed of 95:3:2 lithium titanate, conductive agent graphene and polyvinylidene fluoride binder, the thickness of the active material layer is 100 μm; the lithium metaaluminate composite layer is composed of a mass ratio of 95:2:3 Composed of lithium metaaluminate, conductive agent graphene and polyvinylidene fluoride binder, the thickness of the lithium metaaluminate composite layer is 5...

Embodiment 3

[0042] The lithium titanate composite negative electrode sheet of this embodiment includes copper foil and a functional layer, an active material layer, and a lithium metaaluminate composite layer that are sequentially arranged on the surface of the copper foil along a direction away from the copper foil; the functional layer has a mass ratio of 70:20:10 functional material, conductive agent carbon nanotubes and polyvinylidene fluoride binder, the functional material is ammonium polyphosphate; the thickness of the functional layer is 5 μm; the active material layer is composed of a mass ratio of Composed of 90:5:5 lithium titanate, conductive carbon nanotubes and polyvinylidene fluoride binder, the thickness of the active material layer is 300 μm; the mass ratio of the lithium metaaluminate composite layer is 90:3:7 The lithium metaaluminate composite layer is composed of lithium metaaluminate, conductive agent carbon nanotube and polyvinylidene fluoride binder, and the thickne...

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Abstract

The invention relates to a lithium titanate composite negative electrode piece and a lithium titanate battery. The negative electrode piece comprises a current collector, a functional layer and an active substance layer, wherein the functional layer and the active substance layer are arranged on the surface of the current collector in the direction away from the thickness direction of the current collector; the functional layer comprises a functional substance and a conducting agent by the mass ratio of (70-90):(5-20), and a negative electrode active substance in the active substance layer is lithium titanate. According to the provided lithium titanate composite negative electrode piece, the surface of the current collector is coated with the functional substance, and the contact area between the current collector, the functional layer and the active substance layer is increased, which is beneficial for reducing internal resistance and improving heat dissipating performance; the functional layer can fast absorb redundant heat, a protective layer can be formed on the surface of the current collector and the surface of the active substance layer, potential safety hazards of the battery are controlled at the source, and safety of the battery is ensured.

Description

technical field [0001] The invention belongs to the field of lithium titanate batteries, and in particular relates to a lithium titanate composite negative pole piece and a lithium titanate battery. Background technique [0002] At present, the negative electrodes of commercial lithium-ion batteries mainly use graphite materials. During the rapid charge and discharge process, lithium ions have no time to intercalate between graphite layers, and cause lithium ions to accumulate on the surface of the pole piece, causing safety hazards; one of the measures to improve the safety performance of lithium-ion batteries The anode material with large layer spacing is used to reduce the accumulation of excessive lithium ions on the surface of the pole piece. [0003] The lithium titanate material has the characteristics of zero strain, stable discharge voltage, and no decomposition of the electrolyte, which is conducive to improving the safety performance of ion batteries. At the same...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/485H01M4/62H01M10/0525
CPCH01M4/131H01M4/485H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 王燕吴英鹏龙官奎原东甲李志赵晓锋
Owner 深圳博磊达新能源科技有限公司