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Lithium ion battery anode plate, preparation method thereof and lithium ion battery using lithium ion battery anode plate

A lithium-ion battery, cathode sheet technology, applied in battery electrodes, electrode carriers/current collectors, non-aqueous electrolyte battery electrodes, etc. Good properties, dendrite suppression, and good electrical conductivity

Active Publication Date: 2013-04-24
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the electrochemical system of the existing lithium-ion battery is difficult to meet the requirements of both high-current discharge and controlled charging.
In lithium-ion batteries, if the charge cannot be controlled, it is easy to form lithium dendrites on the negative electrode, which will cause a short circuit and cause safety accidents. This is also the main reason affecting the industrialization of lithium-ion batteries in EVs and HEVs.

Method used

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  • Lithium ion battery anode plate, preparation method thereof and lithium ion battery using lithium ion battery anode plate
  • Lithium ion battery anode plate, preparation method thereof and lithium ion battery using lithium ion battery anode plate
  • Lithium ion battery anode plate, preparation method thereof and lithium ion battery using lithium ion battery anode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] see figure 2 As shown, it is a schematic diagram of Example 1 of the preparation method of lithium-ion battery positive electrode sheet of the present invention, which includes the following steps:

[0042] In the first step, the cathode active material LiCoO 2 , N-type doped carbon nanotubes (N-doping CNT) and binder polyvinylidene fluoride (PVDF) are uniformly dissolved in the solvent N-methylpyrrolidone (NMP) at a weight ratio of 98.5:1:0.5 and stirred evenly; After evaporating the solvent NMP, N-doping CNT-coated LiCoO was obtained by crushing and grinding 2 powder.

[0043] In the second step, N-doping CNT-coated LiCoO 2 , P-type doped carbon nanotubes (P-doping CNT) and binder styrene-butadiene rubber (SBR) are dissolved in solvent water at a weight ratio of 98.5:1:0.5 and stirred evenly; after evaporating the solvent water, crush and grind Obtaining LiCoO coated with P-Doping CNT and N-doping CNT 2 powder.

[0044] In the third step, LiCoO coated with P-Do...

Embodiment 2

[0047] see image 3 Shown is a schematic diagram of Example 2 of the preparation method of the lithium ion battery positive electrode sheet of the present invention, which includes the following steps:

[0048] In the first step, the cathode active material LiCoO 2 , N-doping CNT and binder PVDF are uniformly dissolved in the solvent NMP at a weight ratio of 98.5:1:0.5 and stirred evenly; after the solvent PVDF is evaporated, LiCoO coated with N-doping CNT is obtained by crushing and grinding 2 powder.

[0049] In the second step, P-doping CNT and binder PVDF are dissolved in solvent water at a weight ratio of 2:1, and stirred evenly to obtain a slurry; the slurry is evenly coated on the Al alloy positive electrode current collector to form a P-doping CNT-coated Al alloy cathode current collector.

[0050] In the third step, N-doping CNT-coated LiCoO 2 1. The binder styrene-butadiene rubber (SBR) is dissolved in solvent water at a weight ratio of 98:2, and stirred evenly t...

Embodiment 3

[0053] see Figure 4 Shown is a schematic diagram of Example 3 of the preparation method of the lithium ion battery positive electrode sheet of the present invention, which includes the following steps:

[0054] The first step: the cathode active material LiCoO 2 , N-doping CNT and binder PVDF are uniformly dissolved in the solvent NMP at a weight ratio of 98.5:1:0.5 and stirred evenly. After evaporating the solvent NMP, LiCoO coated with N-doping CNT is obtained by crushing and grinding. 2 powder.

[0055] In the second step, dissolve P-doping CNT and binder PVDF in the solvent NMP at a weight ratio of 2:1, and stir evenly to obtain a slurry; evenly coat the slurry on the polyester film Mylar to obtain P-doping CNT Coated thin film, and this thin film is used as positive electrode current collector.

[0056] In the third step, N-doping CNT-coated LiCoO 2 1. The binder SBR is dissolved in solvent water at a weight ratio of 98.5:1.5, and stirred evenly to obtain a slurry; t...

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Abstract

The invention discloses a lithium ion battery anode plate which comprises an anode current collector and anode active materials distributed on the anode current collector, wherein the anode active materials contain P-type doped nano carbon tubes and N-type doped nano carbon tubes. The P-type doped nano carbon tubes and N-type doped nano carbon tubes, which are added into the lithium ion battery anode plate, can improve the conductivity of the anode in the processes of charging and discharging, and enhance the safety of the lithium ion battery, thereby realizing heavy-current discharge of the lithium ion battery. In addition, the invention also discloses a preparation method of the lithium ion battery anode plate and a lithium ion battery using the lithium ion battery anode plate.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery positive electrode sheet, a preparation method thereof and a lithium ion battery using the positive electrode sheet. Background technique [0002] With the development of social economy, the depletion of traditional energy sources such as oil forces people to look for new alternative energy sources. As a green and high-efficiency battery, lithium-ion battery has the advantages of high working voltage, high energy density and light weight, so it is considered to be the most promising application in future EV, HEV, electric tools and other devices that require high-power discharge. [0003] However, the electrochemical system of the existing lithium-ion batteries is difficult to meet the requirements of both high-current discharge and controlled charging. In lithium-ion batteries, if the charging cannot be controlled, it is easy to form lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/66H01M4/139H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 牛少军张介威何东铭
Owner NINGDE AMPEREX TECH
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