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Low-temperature lithium iron phosphate lithium ion power battery and low-temperature discharging method thereof

A power battery, lithium iron phosphate technology, applied in the direction of secondary battery charging/discharging, battery electrodes, secondary batteries, etc., can solve the problem of electrochemical performance to be improved, reduce the growth activation energy, improve the discharge capacity, improve the Effects of Diffusion Rate and Growth Efficiency

Pending Publication Date: 2021-11-26
江苏久泰电池科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-temperature performance of the low-temperature lithium iron phosphate lithium-ion power battery of the invention has been greatly improved. After the lithium iron phosphate battery is fully charged, it is stored at -40°C±2°C for 20 hours, but there is still a problem that the electrochemical performance needs to be improved.

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  • Low-temperature lithium iron phosphate lithium ion power battery and low-temperature discharging method thereof

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preparation example Construction

[0032] The preparation method of the power battery is as follows: adding N-methylpyrrolidone to the mixed solution of positive electrode active material, binder and conductive agent, stirring in vacuum for 4-6 hours under the condition of circulating water cooling, and passing through a 150-mesh sieve Make a slurry 1-2 times, coat the slurry on an aluminum sheet, and dry it in vacuum at 50°C-60°C for 6-8h to make the positive electrode sheet of the battery;

[0033] Stir the negative electrode active material in deionized water for 3-5 hours, add binder, thickener, and conductive agent and stir for 2-3 hours, pass the slurry through a colloid mill to completely disperse the conductive agent, and pass through a 150-mesh sieve for 1- The slurry is made twice, the slurry is coated on the aluminum sheet, and vacuum-dried at 50°C-60°C for 6-8h to make the negative electrode sheet of the battery; the compacted density of the positive electrode is 2.5-3.5g / cm 3 , the compacted densit...

Embodiment 1

[0038] A low-temperature lithium iron phosphate lithium-ion power battery, comprising a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte, and a battery case column, and the positive electrode material in the positive electrode sheet is composed of a positive electrode active material, a binder, a conductive agent and a positive electrode The composition of the current collector, the dosage ratio of the positive electrode active material, the binder, and the conductive agent is 90:5:8; the positive electrode active material is made of carbon-coated lithium iron phosphate material, and the thickness of the nano-carbon layer in the carbon-coated lithium iron phosphate is It is 2-5nm thick, and the preparation method of carbon-coated lithium iron phosphate is to weigh bis-1,6-hexamethylene triamine pentamethylene with a molar ratio of P:Fe:Li of 1.2:1.5:3.2 Dissolve phosphonic acid, ferrous carbonate, and lithium hydroxide in deionized water, then a...

Embodiment 2

[0047] A low-temperature lithium iron phosphate lithium-ion power battery, comprising a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte, and a battery case column, and the positive electrode material in the positive electrode sheet is composed of a positive electrode active material, a binder, a conductive agent and a positive electrode The composition of the current collector, the dosage ratio of the positive electrode active material, the binder, and the conductive agent is 93:8:12; the positive electrode active material is made of carbon-coated lithium iron phosphate material, and the thickness of the nano-carbon layer in the carbon-coated lithium iron phosphate is It is 2-5nm thick, and the preparation method of carbon-coated lithium iron phosphate is to weigh bis-1,6-hexamethylene triamine pentamethylene with a molar ratio of P:Fe:Li of 1.2:1.5:3.2 Dissolve phosphonic acid, ferrous carbonate, and lithium hydroxide in deionized water, then ...

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Abstract

The invention discloses a low-temperature lithium iron phosphate lithium ion power battery and a low-temperature discharging method, and belongs to the technical field of batteries. The low-temperature lithium iron phosphate lithium ion power battery comprises a positive plate, a negative plate, a diaphragm, an electrolyte and a battery shell column. A positive material in the positive plate consists of a positive active material, a binder, a conductive agent and a positive current collector, the positive active material adopts a carbon-coated lithium iron phosphate material, and the thickness of a nano carbon layer in the carbon-coated lithium iron phosphate is 2-5nm. Polyvinylidene fluoride is adopted as the binder, one or more of conductive carbon black, conductive graphite, crystalline flake graphite and carbon nanotubes are adopted as the conductive agent, and aluminum foil is adopted as the current collector. According to the invention, through chelating of bis-1, 6-hexylidene triamine penta (methylene phosphonic acid) and Fe<2+> ions, a carbon layer is formed in situ, so that the growth activation energy of lithium phosphonate crystal grains can be remarkably reduced, a single crystal carbon-coated lithium phosphonate composite material is obtained, and the electrochemical performance of a battery in a low-temperature environment is improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a low-temperature lithium iron phosphate lithium-ion power battery and a low-temperature discharge method thereof. Background technique [0002] As a new type of energy storage device, lithium-ion batteries can realize the exchange between chemical energy and electrical energy, which provides an important way for the rational and effective development and utilization of new energy. Li-ion batteries have the advantages of high specific energy and small self-discharge, so they quickly occupy the main market of mobile electronic products. In order to cope with the problems of energy shortage and environmental degradation, countries around the world require the use of new energy vehicles to replace fuel vehicles. Li-ion battery vehicles have the characteristics of long mileage and high power, and are considered ideal. However, there are still some problems hindering th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0567H01M10/0525H01M10/44
CPCH01M4/62H01M10/0567H01M10/0525H01M10/443Y02E60/10
Inventor 顾海波周勇
Owner 江苏久泰电池科技有限公司
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