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Anode material of Li-ion secondary battery and battery containing the same

A positive electrode material and secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of low safety performance of batteries, achieve good high-current charge and discharge performance, improve thermal stability, and change structure and volume Reduced effect

Inactive Publication Date: 2008-07-02
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 above-mentioned positive electrode for lithium batteries in the prior art, although the battery can obtain high-current discharge performance, but the safety performance of the battery is relatively low, to provide a battery that can obtain high-current discharge performance, and Positive electrode material for lithium-ion secondary batteries with high battery safety performance

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0032] The preparation method of the material B can adopt the liquid phase coating method of hydrothermal method, sol-gel method, co-precipitation method, redox method, and use the coating source to coat the transition metal lithium oxide C and / or the transition metal Lithium oxide D is obtained. The coating source that adopts contains the slurry of lithium salt, phosphate and ferrous salt, and lithium salt wherein, as one or more in lithium phosphate, lithium carbonate, lithium hydroxide, lithium oxalate and lithium acetate; Phosphate, Such as one or more of ammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate and lithium phosphate; ferrous salts, such as ferrous oxalate, ferrous acetate, ferrous chloride, ferrous sulfate, ferrous phosphate and One or more of ferrous phosphate hydrate.

[0033]Preferably, the preparation method of the material B includes uniformly mixing the above-mentioned coating source and transition metal lithium oxide C and / o...

Embodiment 1

[0054] Divide Fe weight to LiCoO 2 0.1 wt% FeSO 4 and H 3 PO 4 , LiOH was mixed and dissolved in water according to the molar ratio of 1:1:3, and LiCoO was added 2 Powder, mix well, evaporate the solvent, then heat treatment at 700°C for 6 hours, and cool to obtain the coating material LiCoO with an average particle size of 10 microns 2 / LiFePO 4 .

[0055] PVDF was dissolved in NMP at a ratio of 1:10, LiFePO 4 (average particle size is 5 microns), LiCoO 2 / LiFePO 4 The coating material, graphite and carbon black are added to the solution, mixed thoroughly to make a slurry, and its composition is LiFePO 4 :(LiCoO 2 / LiFePO 4 ):(graphite+carbon black):PVDF=70:30:(6+3):5. This slurry is evenly coated on the aluminum foil of 20 microns, is dried at 120 ℃, obtains the positive electrode sheet of 450 * 42 * 170 millimeters after cutting, calendering, contains 5 grams of positive electrode active material (LiFePO 4 +(LiCoO 2 / LiFePO 4 )).

[0056]Dissolve PVDF in NMP ...

Embodiment 2

[0061] According to the same method as in Example 1, the difference is that the composition of the positive electrode material is LiFePO 4 :(LiCoO 2 / LiFePO 4 ):(graphite+carbon black):PVDF=90:10:(6+3):5, LiFePO 4 With an average particle size of 9 microns, LiCoO 2 / LiFePO 4 The average particle size is 13 microns.

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Abstract

The invention relates to an anode material for a lithium ion secondary battery. The anode material comprises anode active substance, a conductive agent and a caking agent, wherein the anode active substance comprises material A and material B. The material B is the oxide C of plated metal lithium and / or the oxide D of plated metal lithium which are coated and processed by the material A. The material A is the lithium phosphate slat with a olivine structure. The anode material can obviously improve the safety performance of the lithium ion secondary battery; the battery has a big capacity; the anode material has a good performance of charge and discharge for a big current, circulation and high temperature storage.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion secondary battery, and also relates to a lithium ion secondary battery containing the positive electrode material. Background technique [0002] At present, LiCoO is the most widely used cathode active material in lithium-ion battery anode materials. 2 , LiNiO 2 or LiMn 2 o 4 , but the above-mentioned positive electrode active materials are easy to decompose at high temperature and generate a lot of heat, which brings a greater safety hazard to the battery. Compared with these several cathode active materials, LiFePO 4 The material has both their advantages, and also has many advantages such as low cost, good safety, good stability, rich iron resources, non-toxic and environmentally friendly, and is very suitable for lithium-ion secondary batteries. However, the low electronic conductivity of lithium iron phosphate as a positive electrode active material has become a bottlenec...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/62H01M10/40
CPCY02E60/10
Inventor 沈晞潘福中万彩敏
Owner BYD CO LTD
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