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Positive electrode film and lithium ion power battery, and preparation method thereof

A technology of positive electrode film and positive electrode sheet, which is applied in the field of positive electrode film and lithium-ion power battery and its preparation, can solve the problems of high power density discharge heat generation, poor safety of power battery, low battery capacity, etc., and achieve reduction in mass use and capacity Increase and decrease the effect of difficulty

Active Publication Date: 2014-12-31
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a positive electrode diaphragm of a battery, which can solve the problems of low capacity and high power density discharge heating of batteries generally prepared by using lithium iron phosphate as the positive electrode active material, and at the same time solve the problem of poor safety of power batteries

Method used

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  • Positive electrode film and lithium ion power battery, and preparation method thereof
  • Positive electrode film and lithium ion power battery, and preparation method thereof
  • Positive electrode film and lithium ion power battery, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] The lithium-ion power battery described in this embodiment includes a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a casing arranged in the casing, the positive electrode sheet includes a positive electrode current collector and a positive electrode diaphragm attached to the positive electrode current collector, and the negative electrode The sheet includes a negative electrode collector and a negative electrode membrane attached to the negative electrode collector; the positive electrode membrane includes a positive electrode active material, conductive carbon black, binder and solvent, and the negative electrode membrane includes a negative electrode active material, conductive carbon black , a binder and a solvent; the positive active material is a mixture of lithium iron phosphate and lithium nickel cobalt manganese ternary material, and the negative active material is artificial graphite;

[0033] Lithium iron phosphate in t...

Embodiment 2

[0040] The lithium-ion power battery described in this embodiment includes a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a casing arranged in the casing, the positive electrode sheet includes a positive electrode current collector and a positive electrode diaphragm attached to the positive electrode current collector, and the negative electrode The sheet includes a negative electrode collector and a negative electrode membrane attached to the negative electrode collector; the positive electrode membrane includes a positive electrode active material, conductive carbon black, binder and solvent, and the negative electrode membrane includes a negative electrode active material, conductive carbon black , a binder and a solvent; the positive active material is a mixture of lithium iron phosphate and lithium nickel cobalt manganese ternary material, and the negative active material is artificial graphite;

[0041] The weight ratio of lithium...

Embodiment 3

[0048] The lithium-ion power battery described in this embodiment includes a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a casing arranged in the casing, the positive electrode sheet includes a positive electrode current collector and a positive electrode diaphragm attached to the positive electrode current collector, and the negative electrode The sheet includes a negative electrode collector and a negative electrode membrane attached to the negative electrode collector; the positive electrode membrane includes a positive electrode active material, conductive carbon black, binder and solvent, and the negative electrode membrane includes a negative electrode active material, conductive carbon black , a binder and a solvent; the positive active material is a mixture of lithium iron phosphate and lithium nickel cobalt manganese ternary material, and the negative active material is artificial graphite;

[0049] The weight ratio of lithium...

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Abstract

The invention discloses a battery positive electrode film and a lithium ion power battery, and a preparation method thereof. A positive electrode active substance adopted in the positive electrode film is a mixture of lithium iron phosphate and a lithium nickel cobalt manganese ternary material. In the mixture, the weight ratio of lithium iron phosphate to the lithium nickel cobalt manganese ternary material is 94.2-94.8:5.2-5.8. With the positive electrode film, prepared lithium ion power battery has good capacity application performance, good high-rate application performance, and excellent high-rate temperature-rise control performance. Under the condition of high-rate discharge, the power battery has no excessive heat generation problem and has good safe performance.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a positive electrode membrane, a lithium-ion power battery and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no pollution and light weight, so they are widely used in the industry. Such as portable mobile products, electric vehicle power batteries and energy storage power stations. [0003] A lithium-ion secondary battery generally includes a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte. Wherein, the positive electrode sheet includes a positive electrode collector and a positive electrode diaphragm attached to the positive electrode collector, and the negative electrode sheet ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/58H01M4/136H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 黄金宏魏银仓张兵
Owner YINLONG ENERGY CO LTD
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