Lithium ion battery positive active substance, anode material, anode material sizing agent, anode piece, preparation method and lithium ion battery

A positive electrode active material and lithium-ion battery technology, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve problems such as limitations, limited conductive internal resistance, and poor conductive effects, and achieve improved Thermal stability, improved safety, and excellent thermal stability

Inactive Publication Date: 2017-12-29
SHANGHAI HUAPU AUTOMOBILE CO LTD
6 Cites 25 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the safety problem of ternary lithium-ion batteries has not been completely resolved, especially the ternary lithium-ion batteries with high nickel content.
However, due to the problem of contact between the metal aluminum foil and the powder, its conductive effect is not good
Som...
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Method used

As can be seen from Fig. 1 and Fig. 2, under 5C rate discharge, the temperature rise of the battery that comparative example 8 obtains is higher than the temperature rise of the battery that embodiment 12 obtains, both difference is at 5 ℃; And with As the rate increases, the difference in temperature rise between the two increases significantly, and the difference can reach 20°C when discharged at a rate of 15C. It can be seen that the temperature rise of the battery coated with graphene layer is significantly higher than that of the battery without graphene layer during use. The battery directly coated with the positive electrode material slurry layer has a low temperature rise during use, especially under high power conditions, and this difference is more obvious. By coating a layer of graphene slurry, the temperature rise during battery use can be reduced, and the safety of the battery can be guaranteed even under high power.
As can be seen from table 2, embodiment 12~16 is to first show the graphene layer that coats one deck on current collector, then coats the pole piece that positive electrode material slurry obtains, and comparative example 8~12 is directly in The electrode sheet obtained by coating the positive electrode material slurry on the current collector, the results show that the electrode sheet resistance obtained in Examples 12-16 is between 5.9-6.1mΩ, while the electrode sheet resistance obtained in Comparative Examples 8-12 is 8.9-9.2mΩ Between them, the electrical resistance of the pole piece coated with the graphene layer was about 33% lower than that of the pole piece not coated with the graphene layer. It can be seen that by first coating the graphene layer on the current collector and then coating the positive electrode material slur...
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Abstract

The invention discloses a lithium ion battery positive active substance, an anode material, an anode material sizing agent, an anode piece, a preparation method thereof and a lithium ion battery, which relates to the technical field of lithium ion batteries. The lithium ion battery positive active substance is mainly prepared from the following components by weight percent: 10 to 50 percent of lithium manganese ferrous phosphate and 50 to 90 percent of nickel cobalt lithium manganate, wherein the lithium manganese ferrous phosphate is LiMn*Fe1-*PO4, x is greater than 0.5 and less than 1; and the nickel cobalt lithium manganate is Li(Ni*CoyMnz)O2, x is greater than 0 and less than 1, y is greater than 0 and less than 1, and z is greater than 0 and less than 1. The lithium ion battery positive active substance solves the problems of excessively high temperature and safety of the traditional lithium battery at multiplying power. By improving an anode material and an anode piece, not only can the heat stability of the anode material be improved, but also the internal resistance of the pole piece can be reduced, the application to the high power can be satisfied, and the safety is good.

Application Domain

Electrode carriers/collectorsSecondary cells servicing/maintenance

Technology Topic

Lithium electrodePhosphate +11

Image

  • Lithium ion battery positive active substance, anode material, anode material sizing agent, anode piece, preparation method and lithium ion battery
  • Lithium ion battery positive active substance, anode material, anode material sizing agent, anode piece, preparation method and lithium ion battery
  • Lithium ion battery positive active substance, anode material, anode material sizing agent, anode piece, preparation method and lithium ion battery

Examples

  • Experimental program(17)
  • Comparison scheme(11)
  • Effect test(5)

Example Embodiment

[0100] Example 1
[0101] A positive active material for a lithium ion battery, consisting of the following components by mass percentage: 10% lithium iron manganese phosphate and 90% lithium nickel cobalt manganate;
[0102] Among them, lithium iron manganese phosphate is LiMn 0.6 Fe 0.4 PO 4 , D50 is 20μm, specific surface area is 30m 2 /g;
[0103] Lithium nickel cobalt manganese oxide is Li(Ni 0.6 Co 0.2 Mn 0.2 )O 2 , D50 is 10μm, specific surface area is 0.3m 2 /g.

Example Embodiment

[0104] Example 2
[0105] An active material for the positive electrode of a lithium ion battery, consisting of the following components by mass percentage: 50% lithium iron manganese phosphate and 50% lithium nickel cobalt manganate;
[0106] Among them, lithium iron manganese phosphate is LiMn 0.7 Fe 0.3 PO 4 , D50 is 30μm, specific surface area is 20m 2 /g;
[0107] Lithium nickel cobalt manganese oxide is Li(Ni 0.8 Co 0.1 Mn 0.1 )O 2 , D50 is 15μm, specific surface area is 0.1m 2 /g.

Example Embodiment

[0108] Example 3
[0109] An active material for the positive electrode of a lithium ion battery, consisting of the following components by mass percentage: 30% lithium iron manganese phosphate and 70% lithium nickel cobalt manganate;
[0110] Among them, lithium iron manganese phosphate is LiMn 0.8 Fe 0.2 PO 4 , D50 is 25μm, specific surface area is 25m 2 /g;
[0111] Lithium nickel cobalt manganese oxide is Li(Ni 0.5 Co 0.2 Mn 0.3 )O 2 , D50 is 12μm, specific surface area is 0.2m 2 /g.
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PUM

PropertyMeasurementUnit
Specific surface area20.0µm
Specific surface area0.3m²/g
Specific surface area30.0µm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Good thermal stability
  • Improve thermal stability
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