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Positive and negative plates for lithium-ion battery and battery employing positive and negative plates

A technology for lithium-ion batteries, positive and negative electrodes, applied in the direction of battery electrodes, positive electrodes, negative electrodes, etc., can solve the problems of reducing battery safety performance, affecting the power characteristics of lithium iron phosphate batteries, and large contact resistance between positive electrode materials and aluminum foil , to achieve the effect of improving life and safety characteristics, improving fast charging ability, and improving contact

Inactive Publication Date: 2016-04-06
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the defects that the existing positive electrode material and aluminum foil contact resistance is relatively large, which affects the capacity and power characteristics of t

Method used

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  • Positive and negative plates for lithium-ion battery and battery employing positive and negative plates
  • Positive and negative plates for lithium-ion battery and battery employing positive and negative plates

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Experimental program
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Effect test

Embodiment 1

[0029] The pre-coated positive electrode material of the positive electrode is the ternary material LiNi 0.3 co 0.3 mn 0.3 o 2 , the particle size range is 4-8um (screened particle size), the lithium iron phosphate material is selected from the particle size range of 0.5-3um, the positive electrode conductive agent is Super-P, the positive electrode binder is polyvinylidene fluoride; the negative electrode The active material is artificial graphite, the negative electrode conductive agent is Super-P, the negative electrode binder is styrene-butadiene rubber, the negative electrode thickener is sodium carboxymethyl cellulose, and the binder for lithium titanate coated on the negative electrode uses polybias Vinyl fluoride, the positive electrode current collector is double-gloss aluminum foil, the negative electrode current collector is double-gloss copper foil, the electrolyte is a combined solvent system of ethylene carbonate, propylene carbonate, and dimethyl carbonate add...

Embodiment 2

[0042] The pre-coated positive electrode material of the positive electrode is the ternary material LiNi 0.5 co 0.3 mn 0.2 o 2 For lithium cobaltate, the particle size range is 4-8um (screened particle size), the lithium iron phosphate material is selected for the particle size range of 0.5-3um, the positive electrode conductive agent is Super-P, and the positive electrode binder is polybiased Vinyl fluoride; the negative electrode active material is artificial graphite, the negative electrode conductive agent is Super-P, the negative electrode binder is styrene-butadiene rubber, the negative electrode thickener is sodium carboxymethyl cellulose, and the negative electrode is coated with lithium titanate. Polyvinylidene fluoride is used as the agent, the positive electrode current collector is Shuangguang aluminum foil, the negative electrode current collector is Shuangguang copper foil, the electrolyte is a combined solvent system of ethylene carbonate, propylene carbonate,...

Embodiment 3

[0055] The pre-coated positive electrode material of the positive electrode is the ternary material LiNi 0.4 co 0.4 mn 0.2 o 2 For lithium manganese oxide, the particle size range is 4-8um (screened particle size), and for lithium iron phosphate materials, the particle size range is 0.5-3um. The positive electrode conductive agent is Super-P, and the positive electrode binder is polybias Vinyl fluoride; the negative electrode active material is artificial graphite, the negative electrode conductive agent is Super-P, the negative electrode binder is styrene-butadiene rubber, the negative electrode thickener is sodium carboxymethyl cellulose, and the negative electrode is coated with lithium titanate. Polyvinylidene fluoride is used as the agent, the positive electrode current collector is Shuangguang aluminum foil, the negative electrode current collector is Shuangguang copper foil, the electrolyte is a combined solvent system of ethylene carbonate, propylene carbonate, and d...

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Abstract

The invention relates to positive and negative plates for a lithium-ion battery. A positive plate substrate is aluminum foil; a negative plate substrate is copper foil; the aluminum foil is coated with a layer of positive material in advance and then coated with a layer of lithium iron phosphate before the positive plate is fabricated; and the copper foil is coated with a layer of negative material in advance and then coated with lithium titanate before the negative plate is fabricated. A large-particle size material is introduced into a positive electrode as a pre-coating, so that contact of the lithium iron phosphate material and the aluminum foil is improved; contact resistance is reduced; and the power characteristic is improved. Meanwhile, the large-particle size material is relatively high in voltage, and can be used for cushion protection when over-charging, so that the lifetime is prolonged and the security feature is improved. A high-potential lithium titanate material is introduced into a negative electrode as an outer coating, so that the safety performance of the negative plate is improved; and the fast charging capability of the negative plate is improved. The lithium titanate material is relatively high in potential, and can be used for cushion protection when over-discharging, so that the lifetime is prolonged and the security feature is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a positive and negative plate for a lithium-ion battery and a battery thereof which reduce DC internal resistance and improve the cycle life of a battery pack. Background technique [0002] In the current domestic market, considering the safety performance of the existing lithium-ion power batteries, the mainstream product is lithium iron phosphate as the positive electrode material and graphite as the negative electrode material as the design solution. Lithium iron phosphate is coated on aluminum foil, and graphite is coated on copper foil. The positive and negative electrodes are either wound or laminated together with the diaphragm to form the core. [0003] Due to its high safety performance and long life characteristics, lithium iron phosphate has become the preferred material for power batteries of mainstream domestic manufacturers. However, due to the low ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M4/583H01M4/485H01M4/131H01M4/133H01M4/136H01M10/0525
CPCH01M4/131H01M4/133H01M4/136H01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/583H01M10/0525H01M2004/027H01M2004/028Y02E60/10
Inventor 焦天宇杜小红
Owner WANXIANG 123 CO LTD