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A lithium ion battery cathode material, and preparation method and application thereof

A technology for lithium-ion batteries and cathode active materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity and cumbersome steps, and achieve high conductivity, high charge-discharge specific capacity, and uniform particle distribution Effect

Inactive Publication Date: 2019-01-04
周霞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently LiCoPO 4 It is mainly synthesized by solid-phase method, and the steps of this method are cumbersome
In addition, LiCoPO 4 The electrical conductivity is poor, and the current methods to improve its electrical conductivity mainly include doping metal ions and doping conductive carbon materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A kind of lithium-ion battery cathode active material, its chemical formula is LiMn 0.1 Ni 0.03 co 0.87 PO 4 . The preparation method of the lithium-ion battery cathode active material is as follows:

[0014] (1) According to the stoichiometric ratio of Li 2 CO 3 , Mn(COO) 2 、CoCl 2 、NiNO 3 and (NH 4 ) 2 HPO 4 After mixing, add water to dissolve and mix well;

[0015] (2) Heat the mixed solution obtained in step 1) until it becomes gelatinous, and dry it;

[0016] (3) Put the product obtained in step 2) in air or oxygen atmosphere at 550~700 o C roasting for 8-10 hours, cooling to room temperature and grinding to obtain LiMn 0.1 Ni 0.03 co 0.87 PO 4 Lithium-ion battery cathode active material.

Embodiment 2

[0018] A kind of lithium-ion battery cathode active material, its chemical formula is LiMn 0.08 Ni 0.06 co 0.86 PO 4 . The preparation method of the lithium-ion battery cathode active material is as follows:

[0019] (1) According to the stoichiometric ratio of Li 2 CO 3 , Mn(COO) 2 、CoCl 2 、NiNO 3 and (NH 4 ) 2 HPO 4 After mixing, add water to dissolve and mix well;

[0020] (2) Heat the mixed solution obtained in step 1) until it becomes gelatinous, and dry it;

[0021] (3) Put the product obtained in step 2) in air or oxygen atmosphere at 550~700 o C roasting for 8-10 hours, cooling to room temperature and grinding to obtain LiMn 0.08 Ni 0.06 co 0.86 PO 4 Lithium-ion battery cathode active material.

Embodiment 3

[0023] Electrochemical performance test:

[0024] Weigh the positive electrode active material, carbon black and polyvinylidene fluoride prepared in Example 1 or 2 according to the ratio of 85:10:5, mix them evenly and press them into tablets to prepare the positive electrode of lithium ion battery; use lithium sheet as negative electrode, porous The polypropylene separator was used as the battery separator, and 1mol / L LiPF6 / EMC+DMC (1:1) was used as the electrolyte, and the battery was assembled in a glove box filled with argon gas. Test the electrical conductivity of the assembled battery, charge-discharge curve and cyclic voltammetry curve for the first time, the results show that the positive electrode active material of lithium ion battery prepared by the present invention has better electrochemical performance, and the first discharge specific capacity is 152mAh / g, than undoped LiCoPO 4 The specific capacity of the first discharge increased by nearly 50%, and the cyclic...

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PUM

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Abstract

A lithium ion battery cathode active material is disclosed, the chemical formula LiMnxNiyCozPO4, 0 < x < 0.15, 0 < y < 0.1, 0.85 < z < 1. The invention also discloses a method for preparing the cathode active material of the lithium ion battery by a sol-gel method, comprising the following steps: 1) mixing Li2CO3, Mn(COO) 2, CoCl2, NiNO3 and (NH4)2HPO4 according to a stoichiometric ratio and adding water to dissolve; 2) heating the mixed solution obtained in the step 1) to a gel state; 3) calcining the product obtained in the step 2) at 550-700oC in an oxidizing atmosphere for 8-10 hours, cooling to room temperature, and grinding. The LiCoPO4 cathode material doped with Mn and Ni ions has the same olivine structure as pure-phase LiCoPO4, uniform particle distribution, and high conductivityand charge / discharge specific capacity.

Description

technical field [0001] The invention relates to an electrode material, in particular to a positive electrode material of a lithium ion battery and a preparation method and application thereof. Background technique [0002] LiCoPO 4 The crystals are orthorhombic crystals with an ordered olivine structure. LiCoPO 4 The theoretical capacitance is 167mAh / g, and the potential is 4.8V relative to the Li electrode. It is expected to become a high-capacity, high-voltage lithium-ion battery cathode material. Currently LiCoPO 4 The solid-phase method is mainly used for synthesis, and the steps of this method are cumbersome. In addition, LiCoPO 4 The conductivity is poor, and the current methods to improve its conductivity mainly include doping metal ions and doping conductive carbon materials. Contents of the invention [0003] Purpose of the invention: The purpose of the invention is to provide a lithium-ion battery cathode material with an olivine structure that has good ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 周霞
Owner 周霞