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A low-temperature lithium-ion battery negative electrode sheet for mobile base stations, preparation method, and lithium-ion battery

A technology for lithium-ion batteries and mobile base stations, applied in the field of lithium-ion batteries, can solve the problems of poor low-temperature performance of negative electrode sheets, achieve good low-temperature charge-discharge performance, meet application requirements, and improve low-temperature electrochemical performance.

Active Publication Date: 2019-08-09
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

[0006] The purpose of the present invention is to provide a low-temperature lithium-ion battery negative electrode sheet for mobile base stations used at 0 to -40°C, thereby solving the problem of poor low-temperature performance of the existing negative electrode sheet

Method used

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  • A low-temperature lithium-ion battery negative electrode sheet for mobile base stations, preparation method, and lithium-ion battery
  • A low-temperature lithium-ion battery negative electrode sheet for mobile base stations, preparation method, and lithium-ion battery

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Experimental program
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Embodiment 1

[0034] The low-temperature lithium-ion battery negative electrode sheet for mobile base stations of this embodiment has a schematic structural diagram as figure 1 As shown, it includes a current collector (copper foil) 1 and a conductive layer 2, an active material layer 3, a solid electrolyte layer 4, and an energy storage functional layer 5 that are sequentially arranged on both sides of the current collector 1 along the direction away from the thickness of the current collector; the conductive layer consists of Composed of three-dimensional carbon material and polyvinylidene fluoride, the mass ratio of three-dimensional carbon material and polyvinylidene fluoride is 70:30; the active material layer is composed of graphite, SP conductive agent and polyvinylidene fluoride, and the mass ratio of the three is 94: 1:5; the solid electrolyte layer is composed of solid electrolyte Li 5 La 3 Ta 2 o 12 , carbon nanotubes, polyvinylidene fluoride, the mass ratio of the three is 3:...

Embodiment 2

[0043] The low-temperature lithium-ion battery negative electrode sheet for mobile base stations in this embodiment has the same structure as in Embodiment 1, wherein the conductive layer is composed of a three-dimensional carbon material and polyvinylidene fluoride, and the mass ratio of the three-dimensional carbon material and polyvinylidene fluoride is 80:20; the active material layer is composed of graphite, SP conductive agent and polyvinylidene fluoride, and the mass ratio of the three is 94:1:5; the solid electrolyte layer is composed of solid electrolyte Li 5 La 3 Nb 2 o 12 , graphene, polyvinylidene fluoride, the mass ratio of the three is 1:1:10; the energy storage functional layer is composed of pentaerythritol phosphate melamine salt, graphene, polyvinylidene fluoride, and the mass ratio of the three is 1: 1:10.

[0044] The preparation method of the low-temperature lithium-ion battery negative electrode sheet for mobile base stations of the present embodiment ...

Embodiment 3

[0052] The low-temperature lithium-ion battery negative electrode sheet for mobile base stations in this embodiment has the same structure as in Embodiment 1, wherein the conductive layer is composed of a three-dimensional carbon material and polyvinylidene fluoride, and the mass ratio of the three-dimensional carbon material and polyvinylidene fluoride is 60:40; the active material layer is composed of graphite, SP conductive agent and polyvinylidene fluoride, and the mass ratio of the three is 94:1:5; the solid electrolyte layer is composed of solid electrolyte Li 6 BaLa 2 Ta 2 o 12 , gas phase growth carbon fiber, polyvinylidene fluoride, the mass ratio of the three is 5:5:20; the energy storage functional layer is composed of ammonium polyphosphate, vapor phase growth carbon fiber, polyvinylidene fluoride, the mass ratio of the three is 5 :5:20.

[0053] The preparation method of the low-temperature lithium-ion battery negative electrode sheet for mobile base stations o...

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Abstract

The invention relates to a negative electrode pole piece of a low-temperature type lithium ion battery for a mobile base station, a preparation method and the lithium ion battery. The negative electrode pole piece comprises a current collector and an active material layer, and also comprises an energy storage functional layer which is positioned on one side, far from the current collector, of the active material layer; the energy storage functional layer comprises a functional material and a conductive agent at the mass ratio of (1-5) to (1-5); and the functional material is melamine cyanurate, pentaerythritol phosphate melamine salt, ammonium polyphosphate, polydimethylsiloxane or melamine pyrophosphate. According to the negative electrode pole piece of the lithium ion battery, the energy storage functional layer is arranged on the exterior of the active material layer, so that when the battery is overhigh in temperature, heat can be absorbed to be used as reaction entropy to supply energy for an electrochemical reaction; and meanwhile, the functional material can storage heat and can release energy at a low-temperature condition, so that the electrochemical reaction can be promoted, and the low-temperature performance of the negative electrode pole piece can be improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a low-temperature lithium-ion battery negative pole piece for a mobile base station, a preparation method and the lithium-ion battery. Background technique [0002] With the advent of the 4G era of communication in my country and the start of the market, communication base stations have brought opportunities for rapid development of energy storage batteries. At present, most of the batteries used in communication base stations are lead-acid batteries, which have low energy density, short cycle life, and strong pollution. Defects, can no longer adapt to the development requirements of batteries for communication base stations. Lithium-ion batteries have the advantages of high specific energy, light weight, long life and no memory effect. At present, they have been widely used in various civilian electronic equipment, energy storage, mobile power and other fields, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/36H01M4/60H01M10/0525H01M10/0562
CPCH01M4/139H01M4/366H01M4/602H01M4/604H01M10/0525H01M10/0562H01M2220/10H01M2300/0071Y02E60/10
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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