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Cell positive electrode and lithium ion cell adopting said positive electrode and preparing method

A battery positive electrode and positive electrode technology, applied in the field of lithium ion batteries and their preparation, can solve the problems of low temperature discharge performance and poor rate performance, and achieve the effect of improving electrical conductivity and good high temperature performance

Inactive Publication Date: 2006-08-09
BYD CO LTD
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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 overcome the defects of poor low-temperature discharge performance and rate performance of lithium-ion batteries in the prior art, and provide a battery positive electrode and a battery containing lithium-ion batteries that can simultaneously improve the high-temperature cycle, storage performance, low-temperature discharge performance and rate performance of lithium-ion batteries. The positive electrode of the Li-ion battery

Method used

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Examples

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preparation example Construction

[0018] The preparation method of the positive electrode can adopt conventional preparation methods. For example, the positive active material, the conductive agent and the binder are mixed with a solvent, coated and / or filled on the current collector, dried, and pressed or not pressed. Wherein, the solvent can be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (DMSO), tetrahydrofuran (THF) and One or more of water and alcohols. The amount of the solvent can make the paste have viscosity and fluidity, and can be coated on the current collector. Generally, based on the weight of the positive electrode active material, the content of the solvent is 5-70 wt%, preferably 15-50 wt%. Wherein, the methods and conditions of drying and compression molding are well known to those skilled in the art. The positive electrode current collector can be a conventional positive electrode current collector in a lithium ion battery, an...

Embodiment 1

[0037] This example illustrates the positive electrode and lithium ion battery provided by the present invention and their preparation methods.

[0038] (1) Preparation of positive electrode

[0039] 100 grams of positive electrode active material LiMn 2 o 4 Place in 1 liter of electroless plating solution (sodium citrate (C 6 h 5 Na 3 o 7 2H 2 O) 0.15 moles, nickel sulfate (NiSO 4 ·6H 2 O) 0.12 moles, sodium hypophosphite (NaH 2 PO 2 ·H 2 (0) 0.25 mole, potassium hydrogen phthalate+sodium hydroxide 0.1 mole, thiourea 1 gram), wherein the pH value of the plating solution is 8, reacted for 1 hour at 80 ° C, and formed on the surface of the positive electrode active material containing nickel and Phosphorus coating. The thickness of the coating is 0.06 microns measured by the β-ray backscattering method; the coating material is analyzed by X-ray powder diffractometer XRD to be amorphous; the coating is determined by the inductively coupled plasma emission spectromete...

Embodiment 2

[0048] This example illustrates the positive electrode material provided by the present invention, the lithium ion battery containing the positive electrode material and their preparation methods.

[0049] (1) Preparation of positive electrode

[0050] 100 grams of positive electrode active material LiMn 2 o 4 Place in 1 liter of electroless plating solution (0.15 moles of citric acid, copper sulfate (CuSO 4 ·5H 2 O) 0.1 mole, sodium hypophosphite (NaH 2 PO 2 ·H 2(2) 0.35 moles, potassium hydrogen phthalate+hydrochloric acid 0.2 moles, thiourea 2.5 grams), wherein the pH value of the plating solution is 4.5, and reacted for 1.5 hours at 90° C., forming a copper-containing and phosphorus-containing copper alloy on the surface of the positive electrode active material plating. The thickness of the coating is 0.12 microns measured by the β-ray backscattering method; the coating material is analyzed by X-ray powder diffractometer XRD to be amorphous; the coating is measured...

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Abstract

Positive pole of battery includes current collection and / or materials of positive pole. The material of positive pole includes active material of positive pole, current conducting agent, and binder. There is a layer of amorphous alloy film of metal and phosphor. The amorphous alloy is selected from one or several amorphous alloys, which can prevent reaction between active materials of positive pole and electrolyte, as well as raise conductivity of pole. Advantages of lithium ion battery of using the positive pole are: performances of favorable circulation in high temperature, storage quality, discharge in low temperature, and multiplying power.

Description

technical field [0001] The present invention relates to a positive electrode of a battery, a battery using the positive electrode and a preparation method thereof, more particularly to a positive electrode of a battery, a lithium ion battery using the positive electrode and a preparation method thereof. Background technique [0002] As a chemical power source, a lithium-ion battery refers to a secondary battery that uses two compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes. When the battery is charged, lithium ions are deintercalated from the positive electrode and intercalated in the negative electrode, and vice versa during discharge. Lithium-ion battery mainly comprises pole core and non-aqueous electrolyte, and described pole core and non-aqueous electrolyte are sealed in the battery case, and described pole core comprises battery electrode and diaphragm, and described battery electrode comprises positive po...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/62H01M4/04H01M10/40H01M10/38
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 周耀华黄保宁
Owner BYD CO LTD
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