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Lithium ion battery, battery module, battery pack, and electric device

A lithium-ion battery and battery module technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as serious gas production inside the battery, abnormal capacity, and lithium precipitation.

Pending Publication Date: 2022-08-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current lithium-ion batteries are difficult to meet people's higher demand for battery life, so the development of lithium-ion batteries with higher energy density has become one of the main directions of lithium-ion battery research and development
[0004] However, during the formation process of a high-energy-density battery, while a stable SEI film is formed on the negative electrode, the solvent and some additives in the electrolyte will be reduced or decomposed, resulting in serious gas production inside the battery. Moreover, compared with low-energy-density batteries with high energy density, the gas production inside the battery is more serious
If the gas produced by chemical formation, such as methane, ethane, ethylene, carbon monoxide, etc., cannot be discharged in time, bubbles will form between the positive and negative electrodes, which will affect the insertion and extraction of lithium ions in the positive and negative electrodes, resulting in an increase in the internal resistance of the battery. Problems such as black spots on the negative electrode interface, local lithium deposition on the negative electrode interface, and abnormal capacity development will ultimately affect the electrical performance and safety performance of the battery

Method used

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  • Lithium ion battery, battery module, battery pack, and electric device
  • Lithium ion battery, battery module, battery pack, and electric device
  • Lithium ion battery, battery module, battery pack, and electric device

Examples

Experimental program
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Effect test

Embodiment 1

[0160] 【Preparation of lithium-ion battery】

[0161] 1) Preparation of positive electrode sheet

[0162] The cathode active material LiNi 0.8 Mn 0.1 Co 0.1 O 2 , Conductive agent acetylene black and binder polyvinylidene fluoride (PVDF) are dissolved in solvent N-methylpyrrolidone (NMP) in a weight ratio of 94:3:3, fully stirred and mixed to obtain positive electrode slurry; The positive electrode slurry is uniformly coated on the positive electrode current collector, and then dried, cold pressed and cut to obtain a positive electrode pole piece.

[0163] 2) Preparation of negative pole piece

[0164] Dissolve the active material artificial graphite, conductive agent acetylene black, binder styrene-butadiene rubber (SBR), and thickener sodium carboxymethyl cellulose (CMC) in the solvent deionized water in a weight ratio of 95:2:2:1 , and mixed uniformly to prepare a negative electrode slurry; the negative electrode slurry is uniformly coated on the negative electrode cur...

Embodiment 2～24、 Embodiment 27～37

[0172] Examples 2 to 24 and Examples 27 to 37, respectively corresponding to the specific surface area S of the negative electrode material, the load M of the negative electrode material on the negative electrode current collector, the width L of the coating area of ​​the negative electrode material, the fluorosulfonate in the electrolyte The content w% of / difluorophosphate is shown in Table 1, and other process conditions are the same as those in Example 1. Finally, the lithium ion battery products of Examples 2-24 and Examples 27-37 were obtained respectively.

Embodiment 25

[0174] Except for adding 1% fluoroethylene carbonate (FEC) to the electrolyte, other parameters and process are the same as in Example 20, and the lithium ion battery product of Example 25 is obtained.

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Abstract

The invention provides a lithium ion battery. The lithium ion battery comprises an electrode assembly and an electrolyte containing fluorosulfonate and / or difluorophosphate substances. The formation gas production area coefficient of the lithium ion battery is alpha, alpha = M * S / 200, M is the loading capacity of the negative electrode material on the negative electrode current collector per unit area and ranges from 5mg / cm < 2 > to 100mg / cm < 2 >, S is the specific surface area of the negative electrode material on the negative electrode current collector and ranges from 0.1 m < 2 > / g to 10m < 2 > / g; the exhaust path coefficient of the lithium ion battery is set to be beta, beta is equal to 100 / L, L is the width of the coating area of the negative electrode material on the surface of the negative electrode current collector, and L is larger than or equal to 50 mm; and the mass percentage w% of the fluorosulfonate and / or difluorophosphate substances in the electrolyte, alpha and beta meet the condition that w * beta / alpha is more than or equal to 0.01 and less than or equal to 20. The lithium ion battery provided by the invention can give consideration to both high energy density and low formation gas production.

Description

technical field [0001] The present application relates to lithium ion batteries, and in particular, to a lithium ion battery with high energy density and low gas production, a preparation method thereof, a battery module, a battery pack and an electrical device. Background technique [0002] With the rapid development of the new energy field, lithium-ion batteries are widely used in various large-scale power devices, energy storage systems and various consumer products due to their excellent electrochemical performance, no memory effect, and low environmental pollution. It is widely used in the field of new energy vehicles such as pure electric vehicles and hybrid electric vehicles. [0003] In the field of new energy vehicles, consumers have put forward higher requirements for the battery life of lithium-ion batteries. However, the current lithium-ion batteries are difficult to meet people's higher demand for battery life, so the development of lithium-ion batteries with h...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567H01M4/13H01M10/058
CPCH01M10/0525H01M10/0567H01M4/13H01M10/058H01M2004/021H01M2004/027Y02E60/10H01M2300/0037H01M4/505H01M4/525H01M10/0569H01M2300/0034
Inventor 邹海林陈培培彭畅梁成都
Owner CONTEMPORARY AMPEREX TECH CO