Secondary battery

A secondary battery and non-aqueous electrolyte technology, which is applied to secondary batteries, circuits, electrical components, etc., and can solve the problems of insufficient high-temperature storage performance of batteries

A secondary battery and non-aqueous electrolyte technology, which is applied to secondary batteries, circuits, electrical components, etc., and can solve the problems of insufficient high-temperature storage performance of batteries

CN114497692AActive Publication Date: 2022-05-13SHENZHEN CAPCHEM TECH CO LTD
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Examples

Experimental program
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Effect test

Embodiment 1

[0132] This embodiment is used to illustrate the secondary battery disclosed in the present invention and its preparation method, including the following steps:

[0133] 1) Preparation of electrolyte

[0134] Ethylene carbonate (EC), fluoroethylene carbonate (FEC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) are EC:FEC:DEC:EMC=20:10:30 by mass ratio: 40 for mixing, then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, then add additives according to Table 1. The amount of the additive is calculated as a percentage of the total mass of the electrolyte.

[0135] 2) Preparation of positive plate

[0136] Mix the positive electrode active material LiNi according to the mass ratio of 97:1.5:1.5 0.8 co 0.1 mn 0.1 o 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The slurry is uniformly coated on both sides of the...

Embodiment 2～40

[0145] Examples 2-40 are used to illustrate the battery disclosed in the present invention and its preparation method, including most of the operation steps in Example 1, the differences are:

[0146] The electrolyte solution shown in Table 1 was used to add the components and the negative electrode material layer.

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Abstract

In order to overcome the problem of insufficient high-temperature storage performance of an existing battery containing a silicon-based material, the invention provides a secondary battery which comprises a positive electrode, a negative electrode with a negative electrode material layer and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material; the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound as shown in a structural formula 1; wherein n is 0 or 1, A is selected from C or O, X is selected from R1 and R2, or R1 and R2 are independently selected from H, or R1 and R2 are not selected from H at the same time, and X, R1 and R2 at least contain one sulfur atom; the secondary battery satisfies the following conditions: 40% < = m < = 90%, 0.05% < = n < = 2%, 1.2 g / cm < 3 > < = r < = 1.8 g / cm < 3 >, and 5% < = S < = 30%. According to the secondary battery provided by the invention, the high-temperature storage performance of the battery can be improved on the premise of ensuring that the battery has excellent energy density.

Description

technical field [0001] The invention belongs to the technical field of energy storage battery devices, and in particular relates to a secondary battery. Background technique [0002] At present, lithium-ion batteries with the advantages of high energy density, long cycle life, and environmental protection have been widely used in 3C digital devices and new energy vehicles, but end users in the power field still have urgent requirements for the improvement of mileage. Therefore, further improving the energy density of power batteries is an urgent problem in the field of lithium-ion batteries. [0003] Among the common anode materials in the lithium-ion battery market, silicon anode materials have become an important direction for improving the energy density of lithium-ion batteries because of their theoretical specific capacity (silicon: 4200mAh / g, graphite: 372mAh / g) which is much higher than that of graphite anode materials. . According to the charge-discharge principle ...

Claims

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Application Information

Patent Timeline
13 May 2022
Publication
CN114497692A
IPC
H01M10/0525; H01M10/0567
CPC
H01M10/0525; H01M10/0567; Y02E60/10; H01M4/386; H01M4/134; H01M4/364; H01M10/052; H01M2300/0025
Inventors
邓永红; 钱韫娴