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A kind of high-power high-capacity lithium-ion battery and preparation method thereof

A lithium-ion battery, large-capacity technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problem that it is difficult to take into account the instantaneous high power output and large-capacity storage of batteries at the same time, and achieve the solution of battery power. Decrease, solve the instantaneous power drop, increase the effect of thickness

Active Publication Date: 2019-03-29
BEIJING HAWAGA POWER STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing power lithium-ion battery structure design is difficult to simultaneously meet the needs of the battery's instantaneous high-power output and large-capacity storage.

Method used

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  • A kind of high-power high-capacity lithium-ion battery and preparation method thereof
  • A kind of high-power high-capacity lithium-ion battery and preparation method thereof
  • A kind of high-power high-capacity lithium-ion battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0044] This embodiment provides a method for preparing a high-power and large-capacity lithium-ion battery with a stacked structure:

[0045] (1) Preparation of positive electrode sheet: In this embodiment, the porous positive electrode current collector 202 is a mixture of conductive filler and binder, the conductive filler is lithium-containing alloy powder, the binder is polyethylene oxide, and the positive electrode active material is lithium iron phosphate. , the conductive agent is selected from conductive graphite, and the binder is selected from polytetrafluoroethylene, wherein the mass ratio of lithium iron phosphate: conductive graphite: polytetrafluoroethylene is 78:20:2, and the positive electrode solvent is added to form a slurry after being stirred evenly. The plate is coated on one side of the mixture layer of conductive filler and binder, and after drying and pressing, a porous current-collecting positive electrode layer 201 is obtained, wherein the thickness of...

Embodiment 2

[0050] This embodiment provides a method for preparing a winding structure square high-power and large-capacity lithium-ion battery:

[0051] (1) Preparation of positive electrode sheet: In this embodiment, the porous positive electrode current collector 202 is made of porous aluminum foam layer, the positive electrode active material is made of lithium manganese phosphate, the conductive agent is made of carbon black, and the binder is made of polyethylene oxide, wherein lithium manganese phosphate : Carbon black: The mass ratio of polyethylene oxide is 90:9:1, and the positive electrode solvent is added to form a slurry after stirring evenly, and is coated on one side of the porous aluminum foam layer by thermal spraying, and the porous aggregate is obtained after drying and pressing. Flow the positive electrode layer 201, wherein the thickness of the coating, that is, the positive electrode material layer 102 is 800 μm, and then uniformly prepare a layer of nano-conductive l...

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Abstract

The invention provides a high-power and large-capacity lithium-ion battery and a preparation method thereof. In the lithium-ion battery, electrode material layers are arranged on two-layer current collectors by changing the structure of the electrode sheet and the placement position of the current collector in the existing lithium-ion battery. The electrode sheets are formed between them, and the positive and negative current collectors are located on both sides of the separator, rather than inside the electrode material layer. This structure makes the battery electrode layer close to the reaction area of ​​the porous current collector, and there is always a low internal resistance area. Therefore, the battery can meet the requirements of instantaneous high-power operation. At the same time, the thickness of the electrode layer can be greatly increased to meet the requirements of large capacity of the battery, thereby effectively solving the contradiction of the increase in battery capacity and the decrease in instantaneous power of the battery; at the same time, the electrode layer and the diaphragm A porous current collector is arranged between them to avoid direct contact between the electrode material layer and the separator, reduce the risk of internal short circuit caused by the active particles of the positive and negative electrodes and the nano-conductive layer entering the separator, and improve the safety of the battery.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a high-power and large-capacity lithium-ion secondary battery. Background technique [0002] Lithium-ion battery is a new type of high-energy battery with lithium-intercalated compounds as positive and negative electrode materials. Compared with lead-acid batteries and nickel-metal hydride batteries, it has a series of advantages such as high specific energy, high voltage, small self-discharge, good cycle performance and long life. Advantages, more and more people's attention. In recent years, lithium-ion battery technology has achieved rapid development and has begun to be used in electric vehicles. [0003] In order to improve the driving ability of electric vehicles, lithium-ion batteries, as the power source of electric vehicles, have high requirements for their storage capacity per unit volume and instantaneous high power output. For example, the higher the power s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/80H01M10/058
CPCH01M4/80H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 陈永翀张晓虎何颖源张艳萍张萍
Owner BEIJING HAWAGA POWER STORAGE TECH
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