High-voltage lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, battery electrodes, secondary battery repair/maintenance, etc., can solve problems such as deteriorating battery performance, inhibit reduction and decomposition, improve high-temperature storage and high-temperature cycle performance, The effect of slowing down the occurrence of side effects

Active Publication Date: 2019-08-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume expansion and contraction of Si material up to 300% during the charge and discharge process leads to the continuous destruction and repair of the SEI film, thereby rapidly deteriorating the battery performance

Method used

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Examples

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Embodiment 1

[0027] A high-voltage lithium-ion battery comprising a positive electrode, a diaphragm, a negative electrode and an electrolyte, the positive electrode comprising LiCoO coated with a layer of tungsten trioxide nanoparticles on the surface 2 active material, the LiCoO 2 Based on the total mass of tungsten trioxide, the mass percentage of said tungsten trioxide is 0.05%;

[0028] The negative electrode comprises graphite / SiO composite active material,

[0029] The electrolyte comprises organic solvent, lithium salt and additives shown in structural formula 1, structural formula 2 and structural formula 3, the additive shown in structural formula 1 accounts for 5% of the total mass of the electrolyte, and the additive shown in structural formula 2 accounts for 1% of the total mass of the electrolyte %, the additive shown in structural formula 3 accounts for 1% of the total mass of the electrolyte,

[0030] The charging cut-off voltage of the lithium ion battery is greater than ...

Embodiment 2～15 and comparative example 1～18

[0045] Embodiments 2-15 and Comparative Examples 1-18 are used to illustrate the lithium ion battery disclosed by the present invention and the preparation method thereof, including most of the operating steps in Example 1. The difference is: 1) the electrolyte Preparation: the types and mass ratios of organic solvents, the types and mass percentages of additives are listed in Table 1. 2) Preparation of cathode material: LiCoO 2 The types and mass percentages of the coating layer on the surface are listed in Table 1. 3) Preparation of negative electrode material: See Table 1 for SiO mass percentage content.

[0046] Battery performance test:

[0047] The following performance tests were performed on the batteries prepared and formed in Comparative Examples 1-18 and Examples 1-15 above:

[0048] Battery cycle performance test at 45°C

[0049] 45°C cycle performance test: After the formed battery was stored in an oven at 45°C for 6 hours, it was charged to 4.45V at a constan...

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Abstract

The invention discloses a high-voltage lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, wherein the positive electrodeincludes a LiCoO2 active substance with the surface being coated with a modification substance, the negative electrode includes a graphite / SiO composite active substance, and the electrolyte includesan organic solvent, lithium salt and an additive. The additive in the electrolyte can form a high temperature resistant passivation film on the surface of the positive electrode, cooperate with a metal oxide on the surface of a positive electrode material to stabilize the passivation film and inhibit the oxidative decomposition of the electrolyte and the dissolution of Co ions, and also can forman SEI film on the surface of the negative electrode and slow down the occurrence of side reactions at the interface between the LiCoO2 positive electrode and the graphite / SiO negative electrode during the high-temperature storage and high-temperature cycle process, thereby improving the high-temperature storage and high-temperature cycle performance of the high-voltage lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to a high-voltage lithium-ion battery with a charging cut-off voltage greater than 4.4V. Background technique [0002] Due to its high energy density, high power, long cycle life and no memory effect, lithium-ion batteries are widely used in the field of 3C consumer electronics products, such as portable electronic products such as notebook computers, smart phones, and digital cameras. [0003] With the development of the market, consumers have put forward higher requirements for the energy density of lithium-ion batteries. To increase the energy density of lithium-ion batteries, one of the most effective ways is to use high-voltage positive electrode materials or negative electrode materials with higher specific capacity. LiCoO 2 Due to the advantages of mature technology and high energy density, it is currently the most widely used cathode material in consumer lithium-ion ba...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525H01M10/0567H01M10/42B82Y30/00
CPCH01M4/366H01M4/628H01M4/525H01M10/0525H01M10/0567H01M10/4235B82Y30/00H01M2004/028Y02E60/10
Inventor 胡时光王朝阳雷志文邓永红
Owner SOUTH CHINA UNIV OF TECH
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