Lithium ion power battery and preparation method thereof

A technology for lithium-ion batteries and power batteries, applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve problems such as low conductivity, limited lithium ion migration rate, and low lithium ion migration rate

Active Publication Date: 2009-04-15
ZHEJIANG GBS GREEN ENERGY CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiFePO 4 The deficiency of positive electrode material is: 1) electrical conductivity is low
2) Lithium ion migration rate is low
Since LiFePO 4 The oxygen atoms in the crystal are arranged in a close-packed hexagonal structure, which can only provide limited channels for the diffusion of lithium ions, thus limiting the migration rate of lithium ions

Method used

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  • Lithium ion power battery and preparation method thereof
  • Lithium ion power battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Take 94% doped Mn, La cations and F anions by mass percentage and surface carbon-coated modified LiFePO 4 , 3% carbon nanofibers, 3% water-soluble binder (the mixture of CMC and AMAC mixed in a mass ratio of 1:1), wherein, LiFePO 4 The mass percent content of doping elements Mn, La, F and surface-coated carbon are respectively LiFePO 4 0.33%, 0.67%, 0.23% and 4% of the total. After adding deionized water and stirring evenly, coat on the aluminum foil, leave 15mm uncoated aluminum foil on one side during the coating process, dry and roll continuously; then roll cut the uncoated aluminum foil continuously to form a continuous Square-wave current collectors with single-sided current collectors (see figure 1 ) to make a positive electrode sheet; in this example, the width a of the unilateral current collector is 8mm, the spacing b is 20mm, and the height c is 15mm.

[0018] 2) Weigh the artificial graphite and water-soluble binder CMC according to the mass ratio of 95...

Embodiment 2

[0021] 1) Take 96% doped Mn, La cations and F anions by mass percentage and surface carbon-coated modified LiFePO 4 , 2% carbon nanofibers, 2% water-soluble binder (the mixture of CMC and AMAC mixed in a mass ratio of 1:1), wherein, LiFePO 4 The mass percent content of doping elements Mn, La, F and surface-coated carbon are respectively LiFePO 4 0.33%, 0.67%, 0.23% and 4% of the total. After adding deionized water and stirring evenly, coat it on the aluminum foil, leave 13mm uncoated aluminum foil on one side during the coating process, dry and roll continuously; then roll cut the uncoated aluminum foil continuously to form a continuous Square-wave current collectors with single-sided current collectors (see figure 1 ) to make a positive electrode sheet; in this example, the width a of the unilateral current collector is 5mm, the spacing b is 15mm, and the height c is 13mm.

[0022] 2) Weigh the artificial graphite and water-soluble binder CMC according to the mass ratio of...

Embodiment 3

[0025] 1) Take 98% doped Mn, La cations and F anions by mass percentage and surface carbon-coated modified LiFePO 4 , 1% carbon nanofiber, 1% water-soluble binder (the mixture of CMC and AMAC mixed in a mass ratio of 1:1), wherein, LiFePO 4 The mass percent content of doping elements Mn, La, F and surface-coated carbon are respectively LiFePO 4 0.33%, 0.67%, 0.23% and 4% of the total. After adding deionized water and stirring evenly, coat on the aluminum foil, leave 15mm uncoated aluminum foil on one side during the coating process, dry and roll continuously; then roll cut the uncoated aluminum foil continuously to form a continuous Square-wave current collectors with single-sided current collectors (see figure 1 ) to make a positive electrode sheet; in this example, the width a of the unilateral current collector is 3mm, the spacing b is 10mm, and the height c is 10mm.

[0026] 2) Weigh the artificial graphite and water-soluble binder CMC according to the mass ratio of 95:...

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Abstract

The invention discloses a lithium ion power battery which comprises an anode and a cathode; the anode thereof is mixed material of LiFePO4, nanometer carbon fiber and caking agent which are mixed with Mn and La cations as well as F anions and the surface of the mixed material is coated and modified by carbon. The preparation method thereof is as follows: after the LiFePO4, the nanometer carbon fiber and the water-soluble caking agent which are mixed with elements and the surfaces of which are coated and modified by carbon are added into de-ionized water and uniformly stirred, the mixture is coated on an aluminum foil with a single side not coated; then the mixture is dried and continuously rolled and pressed; then continuous rolling and cutting are carried out on the part of the aluminum foil that is not coated for forming a squaring current collecting body provided with a single-side current collecting body and manufacturing an anode plate; then the anode plate is coiled and assembled with a spacing membrane and a cathode provided with the squaring current collecting body; an electrolyte is injected for manufacturing the battery. The lithium ion power battery has the advantages of excellent high magnification discharging performances, stable circulating performances, long service life and good safety. The lithium ion power battery can be applied to the traffic tools like hybrid electric vehicles, electric tools, electric toys, and the like.

Description

technical field [0001] The invention relates to a lithium ion power battery and a preparation method thereof. Background technique [0002] The green chemical power source - lithium-ion battery, has high specific energy, no memory effect, no environmental pollution and other performances. It has achieved great success in the fields of mobile communications and notebook computers, and has established an unparalleled leading advantage over other batteries. Due to the outstanding advantages of lithium-ion batteries, they are very suitable as power batteries for pure electric vehicles and hybrid electric vehicles. However, due to the backward development of battery key materials and battery production technology, lithium-ion power batteries have defects such as poor safety and high prices. In LiPFeO 4 Before the material appeared, the application and development of lithium-ion battery cathode materials mainly focused on LiCoO 2 , LiNiO 2 , LiMn 2 o 4 and other material sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/46H01M4/36H01M10/38H01M4/04
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 涂江平张文魁闻人红雁周云闻人红权干玲敏
Owner ZHEJIANG GBS GREEN ENERGY CO
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