Method for in-situ electrochemical fluorination of lithium titanate and prepared fluorinated lithium titanate battery

An in-situ electrochemical, lithium fluoride titanate technology, used in electrochemical generators, electrode manufacturing, battery electrodes, etc., can solve problems such as poor rate performance, achieve strong operability, large industrial application value, high Effects of Capacity and Cycling Stability

Inactive Publication Date: 2018-04-24
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH +1
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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 provide a fluorinated lithium titanate material through in-situ electrochemical fluorination technology to solve the defect of poor rate performance of conventional lithium titanate materials

Method used

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  • Method for in-situ electrochemical fluorination of lithium titanate and prepared fluorinated lithium titanate battery
  • Method for in-situ electrochemical fluorination of lithium titanate and prepared fluorinated lithium titanate battery
  • Method for in-situ electrochemical fluorination of lithium titanate and prepared fluorinated lithium titanate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of in-situ electrochemical lithium fluoride titanate pole piece:

[0036] The active material lithium titanate Li 4 Ti 5 o 12 , conductive carbon black, fluorinated carbon, and binder polyvinylidene fluoride (PVDF) are mixed with solvent N-methylpyrrolidone (NMP) at a mass ratio of 80:7.5:2.5:10 to make a slurry, and then the slurry Evenly coated on the current collector aluminum foil, vacuum dried and punched into 14mm pole pieces.

[0037] (2) Assemble lithium titanate lithium ion battery:

[0038] Put the metal lithium sheet, diaphragm and the above pole piece in sequence in the CR2016 button battery case, and add an appropriate amount of electrolyte LiPF 6 (EC:DMC 3:7) to obtain a lithium titanate lithium ion battery.

[0039] (3) The first discharge formation of lithium titanate lithium ion battery (in situ electrochemical fluorination process):

[0040] On the charge and discharge equipment, the formation current is calculated at 0.1C accordi...

Embodiment 2

[0044] The preparation of the in-situ electrochemical lithium fluoride titanate battery is the same as in Example 1 except that the carbon fluoride feed ratio is different. Fluorocarbon feed mass ratio is 5%.

Embodiment 3

[0046] The preparation of the in-situ electrochemical lithium fluoride titanate battery is the same as in Example 1 except that the carbon fluoride feed ratio is different. The feed mass ratio of fluorocarbon is 7.5%.

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Abstract

The invention discloses a method for in-situ electrochemical fluorination of lithium titanate and a prepared fluorinated lithium titanate battery. The method comprises the following steps: step one, preparing an in-situ electrochemical fluorinated lithium titanate pole piece, adding fluorocarbon into conventional lithium titanate slurry to obtain a mixture, uniformly mixing and coating a current collector with the mixture; step two, assembling a lithium titanate ion battery by taking the pole piece as a negative plate; step three, realizing in-situ electrochemical fluorination of the lithium titanate by first-circle discharge formation, and obtaining an in-situ electrochemical fluorinated lithium titanate battery. According to the method disclosed by the invention, no extra process is needed; the fluorocarbon only needs to be added in the preparation process of the pole piece; fluoride ions are introduced into the lithium titanate by using in-situ electrochemical decomposition of the fluorocarbon; an extra product carbon can provide an excellent electronic conductor for the pole piece. The lithium titanate prepared by an in-situ electrochemical fluorination method has excellent rate performance and cycle performance as well as has a good application prospect and universality in the lithium titanate battery.

Description

technical field [0001] The invention belongs to the field of chemical power sources and also belongs to the technical field of energy materials. It specifically relates to a method and application of an in-situ electrochemical fluoride lithium titanate material. Background technique [0002] With the continuous innovation and development of electronic communication technology, secondary batteries have been paid more and more attention by people. With the advantages of high specific capacity and good cycle stability, lithium-ion batteries are considered to be the most promising secondary batteries. In lithium-ion batteries, the most important thing is the electrode material. At present, the negative electrode material commonly used in the market is graphite, which has the advantages of high specific capacity, but with the deepening of research, the problems of graphite negative electrode are constantly exposed. For example: the lithium intercalation potential of graphite n...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M4/485H01M4/583H01M4/62H01M10/0525
CPCH01M4/0404H01M4/364H01M4/485H01M4/5835H01M4/621H01M4/624H01M10/0525Y02E60/10
Inventor 张熠霄王勇罗英杨炜婧解晶莹罗伟林宴莉琴
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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