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Fast charging lithium titanate composite negative electrode piece and lithium ion battery

A negative electrode sheet and fast charging technology, which is applied in the direction of electrode carrier/collector, battery electrode, secondary battery, etc., can solve the problems that lithium ion battery negative electrode lithium supplementation technology has not been reported, and achieve improved electrochemical performance and consistency performance, increase transmission rate, good effect

Inactive Publication Date: 2016-11-23
深圳博磊达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As mentioned above, the negative electrode lithium supplementation in the prior art is mostly aimed at carbon-based, elemental silicon or silicon oxide negative electrode materials. Compared with lithium titanate, the chemical diffusion coefficient of lithium ions is at least an order of magnitude higher, which is suitable for rapid charging and discharging. There is no report on the negative electrode lithium supplementation technology of fast charge and discharge lithium ion batteries with lithium titanate as the main component of the negative electrode material

Method used

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  • Fast charging lithium titanate composite negative electrode piece and lithium ion battery
  • Fast charging lithium titanate composite negative electrode piece and lithium ion battery
  • Fast charging lithium titanate composite negative electrode piece and lithium ion battery

Examples

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Embodiment 1

[0041] The fast-charging lithium titanate composite negative electrode sheet of this embodiment includes a negative electrode current collector, and one or both sides of the negative electrode current collector are sequentially provided with a lithium titanate composite layer, a lithium supplementary layer, and an aluminum biased layer along a direction away from the negative electrode current collector. Lithium oxide layer, lithium titanate composite layer, lithium supplement layer and lithium metaaluminate layer have a thickness of 200:3:8;

[0042] The negative electrode current collector is mesh copper foil with a thickness of 15 μm and a porosity of 50%;

[0043] The thickness of the lithium titanate composite layer is 200 μm, and it is composed of nano-lithium titanate, graphene, carbon nanotubes and binder polyvinylidene fluoride, and nano-lithium titanate, graphene, carbon nanotubes and polyvinylidene fluoride The mass ratio is 92:2:1:5;

[0044] The lithium replenish...

Embodiment 2

[0055] The fast-charging lithium titanate composite negative electrode sheet of this embodiment includes a negative electrode current collector, and one or both sides of the negative electrode current collector are sequentially provided with a lithium titanate composite layer, a lithium supplementary layer, and an aluminum biased layer along a direction away from the negative electrode current collector. Lithium oxide layer, lithium titanate composite layer, lithium supplement layer and lithium metaaluminate layer have a thickness of 60:1:5;

[0056] The negative electrode current collector is mesh copper foil with a thickness of 10 μm and a porosity of 60%;

[0057] The thickness of the lithium titanate composite layer is 60 μm, and it is composed of nano-lithium titanate, graphene, carbon nanotubes and binder polyvinylidene fluoride, and nano-lithium titanate, graphene, carbon nanotubes and polyvinylidene fluoride The mass ratio is 94:1:1:4;

[0058] The lithium replenishin...

Embodiment 3

[0069] The fast-charging lithium titanate composite negative electrode sheet of this embodiment includes a negative electrode current collector, and one or both sides of the negative electrode current collector are sequentially provided with a lithium titanate composite layer, a lithium supplementary layer, and an aluminum biased layer along a direction away from the negative electrode current collector. Lithium oxide layer, lithium titanate composite layer, lithium supplement layer and lithium metaaluminate layer have a thickness of 200:3:8;

[0070] The negative electrode current collector is mesh copper foil with a thickness of 20 μm and a porosity of 40%;

[0071] The thickness of the lithium titanate composite layer is 200 μm, and it is composed of nano-lithium titanate, graphene, carbon nanotubes and binder polyvinylidene fluoride, and nano-lithium titanate, graphene, carbon nanotubes and polyvinylidene fluoride The mass ratio is 90:1:1:8;

[0072] The lithium replenish...

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Abstract

The invention discloses a fast charging lithium titanate composite negativeelectrode piece and a lithium ion battery. The lithium titanate composite negative electrode piece comprises a negative electrode current collector, wherein one or both sides of the negative electrode current collector are sequentially provided with a lithium titanate composite layer and a lithium-supplementing layer in a direction away from the negative electrode current collector, and the lithium titanate composite layer comprises lithium titanate, graphene and carbon nanotubes according to a mass ratio of (90 to 94) : (1 to 3): (1 to 3); the lithium-supplementing layer comprises organic lithium. The composite negative electrode piece is in a layered structure, the carbon nanotubes and graphene doped in the lithium titanate composite layer have the characteristics of high conductivity and large current carrying capacity, and the lithium titanate has small particles and small transmission distance, so that the lithium ion transmission time is shortened; the lithium-supplementing layer supplies sufficient lithium ions in the charging and discharging process of the battery, and the transmission rate of the lithium ions in the battery is improved, thereby the cycling performance and the rate performance of the battery are improved, and the fast charging effect is good.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a fast-charging lithium titanate composite negative pole piece, and also relates to a lithium-ion battery using the fast-charging lithium titanate composite negative pole piece. Background technique [0002] Lithium-ion battery is a new type of energy storage device developed in recent years, and is widely used in the digital field, energy storage field, electric vehicle field and its fast charging tool field. With the increasing demand for fast-charging batteries in the market in recent years, lithium-ion batteries are required to have the characteristics of fast charging speed, good rate performance, and high safety performance. However, the current use of graphite-based negative electrode materials has been unable to meet the needs of lithium-ion battery negative electrode materials. , so it is necessary to develop other types of anode materials to mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/131H01M4/1391H01M4/70H01M10/0525
CPCH01M4/131H01M4/1391H01M4/366H01M4/485H01M4/625H01M4/628H01M4/70H01M10/0525Y02E60/10
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
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