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Composite negative electrode pole piece and preparation method therefor, and lithium ion battery for mobile base station

A technology of negative pole piece and negative pole is applied in the field of composite negative pole piece and preparation method thereof, and the field of lithium ion battery for mobile base station, which can solve the problem of poor cycle performance of new negative pole material, low energy density of lithium ion battery, and inability to meet high rate charging. Discharge and other problems to achieve the effect of reducing thermal runaway, preventing excessive local temperature, and high compatibility

Pending Publication Date: 2017-07-04
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

[0002] At present, the anode materials of lithium-ion batteries used in the market are mainly graphite materials, but graphite materials have the defect of low gram capacity, which easily leads to low energy density of lithium-ion batteries made from them.
The composite negative electrode sheet in the prior art includes a current collector and a negative electrode active material layer arranged on the surface of the current collector, and the composite electrode sheet has the defect of low energy density of lithium-ion batteries
Although there are technologies to replace graphite materials with high-capacity silicon-carbon anodes, tin-based anodes and their alloy anode materials, these new anode materials have defects such as poor cycle performance, making it difficult to industrialize
In addition, graphite materials in the prior art still have low rate performance, which cannot meet the requirements of high rate charge and discharge.

Method used

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  • Composite negative electrode pole piece and preparation method therefor, and lithium ion battery for mobile base station
  • Composite negative electrode pole piece and preparation method therefor, and lithium ion battery for mobile base station
  • Composite negative electrode pole piece and preparation method therefor, and lithium ion battery for mobile base station

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Effect test

Embodiment 1

[0053] The composite negative electrode sheet in this embodiment includes a conductive heat dissipation layer, a negative electrode active material layer and a red phosphorus layer sequentially stacked on both sides of the negative electrode current collector from the inside to the outside.

[0054] The negative electrode current collector is a 10 μm copper foil. The thickness of the conductive heat dissipation layer is 3 μm. The negative electrode active material layer was 120 μm. The thickness of the red phosphorus layer is 2 μm.

[0055]The conductive heat dissipation layer is composed of the following materials uniformly mixed and bonded together: 8g binder polyvinylidene fluoride, 8g conductive agent carbon nanotubes, 85g nitrogen phosphorus compound ammonium polyphosphate.

[0056] The negative electrode active material layer is composed of the following materials uniformly mixed and bound together: 94g of artificial graphite, 2g of carbon nanotubes, and 3g of LA132 bi...

Embodiment 2

[0066] The composite negative electrode sheet in this embodiment includes a conductive heat dissipation layer, a negative electrode active material layer and a red phosphorus layer sequentially stacked on both sides of the negative electrode current collector from the inside to the outside.

[0067] The negative electrode current collector is a 10 μm copper mesh. The porosity of the copper mesh is 50%. The thickness of the conductive heat dissipation layer is 1 μm. The negative electrode active material layer was 80 μm. The thickness of the red phosphorus layer is 1 μm.

[0068] The conductive heat dissipation layer is made of the following raw materials: 5g binder polyvinylidene fluoride, 5g conductive agent graphene, and 80g nitrogen-phosphorus compound ammonium polyphosphate.

[0069] The negative electrode active material layer is made of the following raw materials: 90g of artificial graphite, 3g of graphene, and 4g of LA132 binder.

[0070] The preparation method of ...

Embodiment 3

[0079] The composite negative electrode sheet in this embodiment includes a conductive heat dissipation layer, a negative electrode active material layer and a red phosphorus layer sequentially stacked on both sides of the negative electrode current collector from the inside to the outside.

[0080] The negative electrode current collector is a 15 μm copper foil. The thickness of the conductive heat dissipation layer is 5 μm. The negative electrode active material layer was 200 μm. The thickness of the red phosphorus layer is 3 μm.

[0081] The conductive heat dissipation layer is made of the following raw materials: 10g binder polyvinylidene fluoride, 10g conductive agent vapor-phase grown carbon fiber, and 90g nitrogen-phosphorus compound ammonium polyphosphate.

[0082] The negative electrode active material layer is made of the following raw materials: 95g of artificial graphite, 1g of vapor-phase grown carbon fiber, and 2g of LA132 binder.

[0083] The preparation meth...

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Abstract

The invention relates to a composite negative electrode pole piece and a preparation method therefor, and a lithium ion battery for a mobile base station, and belongs to the technical field of the lithium ion battery. The composite negative electrode pole piece comprises a negative electrode current collector and a negative electrode active material layer, wherein a red phosphorus layer is arranged on the surface of the negative electrode active material layer. By virtue of the red phosphorus layer, the capacity per gram of the negative electrode material of the lithium ion battery can be given full play, and the electrochemical stability can be improved.

Description

technical field [0001] The invention relates to a composite negative pole piece and a preparation method thereof, and a lithium ion battery for a mobile base station, belonging to the field of lithium ion batteries. Background technique [0002] At present, the anode materials of lithium-ion batteries used in the market are mainly graphite materials, but graphite materials have the defect of low gram capacity, which easily leads to low energy density of lithium-ion batteries made from them. The composite negative electrode sheet in the prior art includes a current collector and a negative electrode active material layer arranged on the surface of the current collector, and the composite negative electrode sheet has the defect of low energy density of lithium-ion batteries. Although there are technologies to replace graphite materials with high-capacity silicon-carbon anodes, tin-based anodes and their alloy anode materials, these new anode materials have defects such as poor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/38H01M4/587H01M10/0525
CPCH01M4/13H01M4/139H01M4/366H01M4/38H01M4/587H01M10/0525H01M10/654H01M2220/10Y02E60/10
Inventor 王燕原东甲李志刘喜龙
Owner 深圳博磊达新能源科技有限公司
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