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Lithium ion battery capable of being rapidly charged and preparation method of lithium ion battery

A lithium-ion battery and fast charging technology, applied in the field of lithium-ion batteries, can solve the problems of inability to withstand high current fast charging, the impact of cycle life, shorten battery life and other problems, achieve good electrochemical performance, alleviate volume shrinkage expansion and structure Collapse, the effect of increasing the liquid-solid contact area

Inactive Publication Date: 2019-09-06
合肥众禾动力新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the problems of lithium-ion batteries include: the charging current is too small and the time is long; it cannot withstand high-current fast charging; when high-current fast charging, a large number of lithium ions gather on the surface of the negative electrode and cannot be effectively diffused. Lead to lithium precipitation and shorten battery life
[0004] Chinese invention patent application CN101262078A discloses a fast-chargeable lithium-ion battery and its preparation method. The scheme uses submicron lithium titanate as the active material of the negative electrode. Although it can improve the fast-charging performance to a certain extent, the cycle The lifespan will be affected, and the capacity retention rate after 300 cycles can only be maintained at 80%

Method used

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  • Lithium ion battery capable of being rapidly charged and preparation method of lithium ion battery

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Embodiment 1

[0045] A rapidly chargeable lithium-ion battery, comprising a positive electrode, a negative electrode, and a diaphragm inserted between the positive electrode and the negative electrode, and an organic electrolyte;

[0046] The active material of the positive electrode is lithium manganate, the particle size D50 of the active material of the positive electrode is 3.1 microns, and the positive electrode surface density of the positive electrode is 357g / m 2 ;

[0047] The active material of the negative electrode is graphite, the particle size D50 of the active material of the negative electrode is 11.5 microns, and the negative surface density of the negative electrode is 179g / m 2 ;

[0048] Both positive and negative electrodes use modified carbon nanotubes as conductive agents;

[0049] The lithium salt in the organic electrolyte is LiPF 6 , and its concentration is 1.3mol / L.

Embodiment 2

[0051] A rapidly chargeable lithium-ion battery, comprising a positive electrode, a negative electrode, and a diaphragm inserted between the positive electrode and the negative electrode, and an organic electrolyte;

[0052] The active material of the positive electrode is lithium manganate, the particle size D50 of the active material of the positive electrode is 5.6 microns, and the positive electrode surface density of the positive electrode is 362g / m 2 ;

[0053] The active material of the negative electrode is graphite, the particle diameter D50 of the active material of the negative electrode is 14.5 microns, and the negative surface density of the negative electrode is 183g / m 2 ;

[0054] Both positive and negative electrodes use modified carbon nanotubes as conductive agents;

[0055] The lithium salt in the organic electrolyte is LiPF 6 , and its concentration is 1.5mol / L.

Embodiment 3

[0057] A rapidly chargeable lithium-ion battery, comprising a positive electrode, a negative electrode, and a diaphragm inserted between the positive electrode and the negative electrode, and an organic electrolyte;

[0058] The active material of the positive electrode is lithium manganate, the particle size D50 of the active material of the positive electrode is 8.1 microns, and the positive electrode surface density of the positive electrode is 373g / m 2 ;

[0059] The active material of the negative electrode is graphite, the particle diameter D50 of the active material of the negative electrode is 17.5 microns, and the negative surface density of the negative electrode is 187g / m 2 ;

[0060] Both positive and negative electrodes use modified carbon nanotubes as conductive agents;

[0061] The lithium salt in the organic electrolyte is LiPF 6 , and its concentration is 1.7mol / L.

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Abstract

The invention discloses a lithium ion battery capable of being rapidly charged and a preparation method of the lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm inserted between the positive electrode and the negative electrode, and an organic electrolyte; the particle size D50 of an active material of the positive electrode is 3.1-8.1 microns; the particle size D50 of an active material of the negative electrode is 11.5-17.5 microns; the positive electrode surface density of the positive electrode is 357-373g / m<2>; and the negativeelectrode surface density of the negative electrode is 179-187g / m<2>. The lithium ion battery has good high-current rapid charging performance; the lithium precipitation of the battery is not caused;and the cycle life of the battery is not influenced. In addition, 1.3-1.7mol / L of LiPF6 is used as a lithium salt, and a modified carbon nanotube is used as a conductive agent, so that the high-current rapid charging performance can be further improved, and the final charging time is shortened by 55-60%.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a fast-chargeable lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in notebook computers, mobile phones, digital cameras, video cameras, PDAs, Bluetooth headsets and wireless 3C products, but the applications of electric vehicles and hand tools that require high power are not yet mature. Electric vehicles (EV) are known as one of the most important industrial products in this century, and lithium-ion batteries will be the primary choice of energy for electric vehicles. As far as this application is concerned, the need for fast charging is the primary challenge and urgent problem to be solved. [0003] At present, the problems of lithium-ion batteries include: the charging current is too small and the time is long; it cannot withstand high-current fast charging; when high-curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/058H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/624H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 卢义胜张杰陈斌周强左铸
Owner 合肥众禾动力新能源科技有限公司
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