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Preparation method of high-energy-efficiency positive electrode composite material of lithium ion battery

A lithium-ion battery and composite material technology, which is applied in the field of preparation of high-energy-efficiency lithium-ion battery positive electrode composite materials, can solve the problems of wasting electrode materials, increasing manufacturing costs, and low efficiency, and achieve improved conductivity, long service life, and high efficiency. The effect of specific capacity

Active Publication Date: 2014-05-14
ZHEJIANG EPTONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when a material with 100% efficiency is used as the cathode active material, the electrode material is unfavorably wasted in a manner proportional to the irreversible capacity of about 10%-20%
In addition, when using a negative active material with relatively low efficiency, the amount of the negative active material should be increased according to the higher efficiency of the positive electrode, which disadvantageously requires an increase in manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The chemical formula of the active material is Li 0.9 Mg 0.1 Fe 0.85 Nb 0.15 (P 0.98 o 4 ), weigh lithium hydroxide, magnesium chloride, ferrous sulfate, niobium nitrate, and diammonium hydrogen phosphate according to the molar amounts of Li, Mg, Fe, Nb, and P in the above chemical formula.

[0020] Dissolving the above-mentioned raw materials in deionized water and a sufficient amount of ammonia water are initially mixed to precipitate hydroxides of Mg, Fe and Nb to obtain a mixture; supercritical water is mixed with the above-mentioned mixture for a second time to synthesize lithium metal composite oxides, and drying it, wherein the supercritical water is water at 400° C. under a pressure of 300 bar; the dried object is sintered at a calcination temperature of 900° C., cooled, and ball milled to obtain active material particles.

[0021] The conductive glass material Li 2 O-LiCl, Li 2 O-B 2 o 3 -SiO 2 Mix with graphene according to the ratio of mass ratio 1:...

Embodiment 2

[0023] The chemical formula of the active material is Li 0.875 Mg 0.125 Fe 0.8 Nb 0.2 (P 0.093 o 4 ), weigh lithium hydroxide, magnesium chloride, ferrous sulfate, niobium nitrate, and diammonium hydrogen phosphate according to the molar amounts of Li, Mg, Fe, Nb, and P in the above chemical formula.

[0024] Dissolving the above-mentioned raw materials in deionized water and a sufficient amount of ammonia water are initially mixed to precipitate hydroxides of Mg, Fe and Nb to obtain a mixture; supercritical water is mixed with the above-mentioned mixture for a second time to synthesize lithium metal composite oxides, and drying it, wherein the supercritical water is water at 500° C. under a pressure of 450 bar; the dried object is sintered at a calcination temperature of 1100° C., cooled, and ball milled to obtain active material particles.

[0025] The conductive glass material Li 2 O-LiCl, Li 2 O-B 2 o 3 -SiO 2 After mixing with graphene in a mass ratio of 1:3:3, ...

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Abstract

The invention relates to a preparation method of a high-energy-efficiency positive electrode composite material of a lithium ion battery. The method comprises the following steps: (1) weighing lithium hydroxide, magnesium chloride, ferrous sulfate, nitrate niobium and diammonium hydrogen phosphate according to the molar weights of Li, Mg, Fe, Nb and P in a chemical formula Li(1-x)MgxFe(1-y)Nby(P(1-z)O4) of an active substance to prepare active substance particles, wherein x is equal to 0.1-0.125, y is equal to 0.15-0.20 and z is equal to 0.02-0.07; (2) mixing electric conductive glass materials Li2O-LiCl, Li2O-B2O3-SiO2 and graphene, and carrying out ball milling into uniform powder so as to obtain an electric conductive material for later use; and (3) mixing the active substance particles and the electric conductive material in deionized water, stirring fully, evaporating to remove moisture, and baking residues obtained from moisture evaporation in the argon atmosphere, thereby obtaining the high-energy-efficiency positive electrode composite material. The active substances of the positive electrode composite material prepared by the method are modified by Mg and Nb so as to improve the activity of the material; the surface of the material is coated with a mixed electric conductive material with favorable adhesion so as to improve the electric conductivity and cycle stability of the material.

Description

Technical field [0001] The invention relates to a preparation method of a high-energy-efficiency lithium-ion battery cathode composite material. Background technique [0002] With the rapid development of the battery industry, in order to solve many problems such as battery life, energy density, self-discharge or quality, various types of batteries have emerged. At present, due to the advantages of high energy density, long service life, light weight, and small self-discharge, lithium batteries have become the preferred power source for portable devices such as communication equipment and notebook computers, and have also begun to be applied to electric vehicles, national defense, etc. in large equipment. [0003] Lithium secondary batteries generally use carbonaceous materials as negative electrode active materials. In addition, use of lithium metal, sulfur compounds, and the like as negative electrode active materials has been considered. At the same time, lithium secon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/1397H01M4/362H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 张萍
Owner ZHEJIANG EPTONG TECH CO LTD