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All-solid-state lithium battery composite positive electrode and preparation method thereof

A composite positive electrode and lithium battery technology, applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., to achieve the effects of good uniformity, simple preparation method, and excellent electrochemical performance

Inactive Publication Date: 2018-04-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to improve the problem of the contact area between the positive electrode of the all-solid lithium battery and the electrolyte interface, and to provide a composite positive electrode of the all-solid lithium battery that is simple to operate, low in production cost, and capable of mass production and a preparation method thereof

Method used

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  • All-solid-state lithium battery composite positive electrode and preparation method thereof
  • All-solid-state lithium battery composite positive electrode and preparation method thereof
  • All-solid-state lithium battery composite positive electrode and preparation method thereof

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specific Embodiment approach 1

[0028] Specific Embodiment 1: This embodiment describes a composite positive electrode of an all-solid-state lithium battery. The raw materials for preparing the composite positive electrode are composed of lithium titanate, vapor-phase grown carbon fiber VGCFs and Binary sulfide electrolyte LPSCI composition.

specific Embodiment approach 2

[0029] Embodiment 2: A preparation method of the all-solid-state lithium battery composite positive electrode described in Embodiment 1 is prepared by a liquid phase method, and the specific steps of the method are as follows:

[0030] Step 1: First, take 10~100 mL of 200# gasoline in a 40mm×70mm weighing bottle, weigh lithium titanate powder, VGCFs, and LPSCl electrolyte in total according to the mass ratio, and add 10~50 g into the weighing bottle, and mix and stir for 12~ 24 hours;

[0031] Step 2: Dry the mixed solution obtained in Step 1, the drying temperature is 50-100 ° C, the drying time is 10-24 hours, and the drying atmosphere is an argon atmosphere to obtain Li 4 Ti 5 o 12 and Li 6 P.S. 5 Cl (LTO@LPSCl) mixed powder;

[0032] Step 3: Press 1-30 mg of the mixed powder obtained in Step 2 into a ceramic sheet, the pressing pressure is 100-550 MPa, and the pressing time is 1-60 min, and the composite positive electrode is obtained.

Embodiment 1

[0034] First, take 50mL of 200# gasoline in a 40mm×70mm weighing bottle, weigh lithium titanate powder, VGCFs, and LPSCl electrolyte 5 g, 4 g, and 1 g into the weighing bottle at a mass ratio of 5:4:1, respectively. After stirring for 20 h, the obtained mixed solution was dried in an argon atmosphere at 60 °C for 20 h, and 10 mg of the dried mixed powder was weighed and pressed at 330 MPa for 30 min to obtain a composite positive electrode.

[0035] The obtained composite cathode material was characterized by XRD, such as figure 1 As shown, it can be seen that the characteristic peaks of LTO and LPSCl are sharp and independent of each other, without missing. Therefore, in the process of mixing, there is no side reaction between the two phases, and the original crystal form and state are maintained. The obtained electrolyte was characterized by SEM, and the results were as follows: figure 2 As shown, it can be seen that the particle size of the composite dielectric particles...

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Abstract

An all-solid-state lithium battery composite positive electrode and a preparation method thereof belong to the technical field of a lithium ion battery. The composite positive electrode is prepared from lithium titanate, vapor-phase growth carbon fiber VGCFs and a binary sulfide electrolyte LPSCI according to a mass ratio being (1-5):(1-5):1. The method comprises the following steps of (1) taking10-100mL of 200# gasoline in a weighting bottle, weighing and adding lithium titanate powder, VGCFs and the LPSCI electrolyte in an amount of 10-50g according to a mass ratio into the weighing bottle,and performing mixing and stirring for 12-24 hours; (2) drying the obtained mixed solution to obtain Li4Ti5O12 and Li6PS5Cl mixed powder, wherein the temperature is 50-100 DEG C, the time is 10-24 hours, and the drying atmosphere is argon atmosphere; and (3) pressing the obtained mixed powder to form a ceramic sheet per 1-30mg, thereby obtaining the composite positive electrode, wherein the pressing pressure is 100-550MPa, and the pressing time is 1-60 minutes. The preparation method has the advantages of simplicity and low cost, and the obtained composite positive electrode material is relatively good in particle uniformity, relatively high in lithium ion conductivity and excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite positive electrode of an all-solid lithium battery and a preparation method thereof. Background technique [0002] Secondary lithium-ion batteries are widely used in the field of portable electronic products due to their high voltage, high energy density, and long cycle life. At present, commercial secondary lithium-ion batteries use organic solvents as electrolytes, which have disadvantages such as liquid leakage, flammability, and explosion, which limit their application in the hybrid and electric vehicle industries. Not only that, people's requirements for battery energy density continue to increase, and the density of secondary liquid lithium-ion batteries is about to reach the limit value, so it is urgent to develop a new battery system. The secondary all-solid-state lithium battery uses metal lithium as the negative electrode and uses ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/131H01M4/1391H01M4/04H01M10/0525
CPCH01M4/0435H01M4/131H01M4/1391H01M4/362H01M4/485H01M4/62H01M10/0525Y02E60/10
Inventor 高云智吴李斌曹毅付传凯汤卫平吴勇民
Owner HARBIN INST OF TECH
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