Cathode composite material of fast ion modified silicate lithium battery, and preparation method thereof

A composite material and ion modification technology, which is applied in the field of fast ion modified silicate lithium battery positive electrode composite materials and its preparation, to avoid direct contact, prevent sintering and agglomeration, and improve contact conductance

Inactive Publication Date: 2018-11-23
重庆环纽信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a fast ion-modified silicate lithium battery positive electrode composite material and its preparation method to solve the problem of increasing the charging cut-off voltage to improve the reversible capacity of the material, improve the interface stability, material conductivity and The problem of fast charge and discharge performance of materials

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  • Cathode composite material of fast ion modified silicate lithium battery, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] Example 1 Preparation of Fast Ion Modified Silicate Lithium Battery Positive Electrode Composite Material I

[0021] Step 1. Lithium acetate, manganese acetate, iron acetate, tetraethyl orthosilicate in molar ratio Li: Ca: Fe: Mn: SiO 4 2- =2:0.4:0.6:1 After accurate weighing, put it into the reactor, and then add the catalyst, the catalyst is an acetic acid-ethanol mixture with a mass ratio of acetic acid and ethanol of 1:20, fully stir evenly, and in a sealed state React at 100°C for 18-36 hours to obtain a gel;

[0022] Step 2. Take out the gel obtained in step 1, dry it and mix it with glucose. The mass ratio of the fast ion precursor to glucose is 1:0.01. Then, the mixture is ball milled in a planetary ball mill. The ball milling medium is deionized water. Mix at a speed of 400r / min for 3 hours, prepare the mixture into a homogenate with a mass concentration of 10%wt., pump the homogenate into a spray drying tower for granulation, the spray gas is air, the inlet ...

Embodiment 2

[0024] Example 2 Preparation of Fast Ion Modified Silicate Lithium Battery Positive Electrode Composite Material II

[0025] Step 1. Lithium acetate, manganese acetate, iron acetate, tetraethyl orthosilicate in molar ratio Li: Ca: Fe: Mn: SiO 4 2- =2:0.8:0.2:1 After accurate weighing, put it into the reactor, and then add the catalyst, the catalyst is an acetic acid-ethanol mixture with a mass ratio of acetic acid and ethanol of 1:30, fully stir evenly, and in a sealed state React at 150°C for 18-36 hours to obtain a gel;

[0026] Step 2. Take out the gel obtained in step 1, dry it and mix it with sucrose. The mass ratio of fast ion precursor to sucrose is 1:0.2, and then ball mill the mixture in a planetary ball mill. The ball milling medium is deionized water. Mix at a speed of 400r / min for 3 hours, prepare the mixture into a homogenate with a mass concentration of 25%wt., pump the homogenate into a spray drying tower for granulation, the spray gas is nitrogen, the inlet t...

Embodiment 3

[0028] Example 3 Preparation of Fast Ion Modified Silicate Lithium Battery Positive Electrode Composite Material III

[0029] Step 1. Lithium acetate, manganese acetate, iron acetate, tetraethyl orthosilicate in molar ratio Li: Ca: Fe: Mn: SiO 4 2- =2:0.5:0.5:1 After accurate weighing, put it into the reactor, and then add the catalyst, the catalyst is an acetic acid-ethanol mixture with a mass ratio of acetic acid and ethanol of 1:25, fully stir evenly, and in a sealed state React at 120°C for 18-36 hours to obtain a gel;

[0030] Step 2. Take out the gel obtained in step 1, dry it and mix it with polyethylene glycol. The mass ratio of fast ion precursor to polyethylene glycol is 1:0.1, and then ball mill the mixture in a planetary ball mill, and the ball milling medium It is deionized water, mixed for 3 hours at a speed of 400r / min, the mixture is prepared into a homogenate with a mass concentration of 15%wt., and the homogenate is pumped into a spray drying tower for gran...

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Abstract

The invention discloses a cathode composite material of a fast ion modified silicate lithium battery, and a preparation method thereof. The cathode composite material is composed of a silicate activematerial Li<2>Fe<x>Mn<1-x>SiO<4> and a fast ion conductor layer coating the outside surface thereof; and the mass ratio of the silicate active material to the fast ion conductor layer is 1:(0.05-0.3).Compared with the prior art, by means of the cathode composite material in the invention, the battery capacity can be greatly increased; furthermore, the cycle performance, the rate performance, theover-charging performance and the security performance can be greatly improved; a silicate precursor prepared by adoption of in-situ carbonization composition and ball-milling / spray drying can preventsintering and aggregation among silicate particles; the lithium ion transmission path is shortened; the fast ion conductor layer coats the outside surface of the silicate active material; internallyand externally mutual diffusion can be carried out; therefore, the two are organically connected, so that a mosaic structure is formed; direct contact between the material and electrolyte is avoided;the lithium ion diffusion capability is improved; and the interface resistance between the material and the electrolyte is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a fast ion-modified silicate lithium battery cathode composite material and a preparation method thereof. Background technique [0002] Since the concept of rechargeable lithium batteries was proposed in the early 1970s, and since lithium-ion batteries were born and commercialized, due to their superior performance, they have rapidly become a multidisciplinary research field in advanced energy, materials, and electrochemistry. Hot spots, and are widely used in notebook computers, mobile phones, digital cameras, mp3 players and other small electronic equipment and medical equipment as driving power. [0003] The cathode material in lithium-ion batteries is the key factor affecting the performance of the battery. The ideal cathode material for lithium-ion batteries should have high capacity, high rate, and high cycle performance. It should also have the advantages of envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 苟荀
Owner 重庆环纽信息科技有限公司
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