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Lithium ion secondary battery electrolyte and lithium ion secondary battery

A secondary battery and electrolyte technology, applied in the field of lithium-ion secondary battery electrolyte and lithium-ion secondary battery, can solve the problem of battery cycle performance, poor high-temperature storage performance and low-temperature discharge performance, and intensified dissolution of metal ions in the positive electrode of oxidation decomposition and other issues, to achieve the effect of improving cycle performance, improving electrochemical performance, and reducing interfacial impedance

Pending Publication Date: 2018-12-07
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide an electrolyte solution for a lithium ion secondary battery, aiming at solving the problem of oxidative decomposition of the electrolyte solution and intensified stripping of positive electrode metal ions in the existing lithium ion secondary battery under high temperature and / or high pressure working conditions, resulting in battery The problem of poor cycle performance, high temperature storage performance and low temperature discharge performance

Method used

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  • Lithium ion secondary battery electrolyte and lithium ion secondary battery
  • Lithium ion secondary battery electrolyte and lithium ion secondary battery
  • Lithium ion secondary battery electrolyte and lithium ion secondary battery

Examples

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Embodiment 1

[0062] A lithium ion secondary battery, comprising positive pole, negative pole, diaphragm and electrolyte, wherein, positive pole active material is lithium cobaltate (LCO) material; Negative pole active material is artificial graphite (AG), described lithium ion secondary battery The preparation method comprises the following steps:

[0063]Mix the positive electrode active material LCO, conductive carbon black and binder polyvinylidene fluoride according to the mass ratio of 96.8:2.0:1.2, and disperse them in N-methyl-2-pyrrolidone to obtain the positive electrode slurry, and make the positive electrode slurry uniform Coated on both sides of the aluminum foil, after drying, calendering and vacuum drying, and welding the aluminum lead-out wire with an ultrasonic welder to obtain a positive plate (positive plate), the thickness of the plate is between 100 and 115 μm;

[0064] Mix graphite, conductive carbon black, binder styrene-butadiene rubber and carboxymethyl cellulose in...

Embodiment 2～ Embodiment 15

[0069] Examples 2 to 15, except that the composition and content of the additives in the electrolyte (based on the total mass of the electrolyte) are different, the preparation of the other positive poles, negative poles, separators, and lithium-ion secondary batteries are the same as in Example 1. In each embodiment The selection and content of the fluoroether shown in structural formula I and the phosphoric acid cyclic anhydride compound shown in structural formula II are shown in Table 1.

Embodiment 16～ Embodiment 29

[0097] In Example 16 to Example 29, NCA is used as the positive electrode material of the lithium ion secondary battery, the negative electrode active material is silicon carbon, and the capacity of the silicon carbon negative electrode is 500mAh / g. Diaphragm coated with Al on one side 2 o 3 ceramic diaphragm. The composition and content of additives in the electrolyte used (based on the total mass of the electrolyte) were added as shown in Table 3. The battery evaluation charge cut-off voltage was 4.2V, and the discharge lower limit voltage was 2.75V. All the other preparation processes are the same as in Example 1.

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Abstract

The invention provides a lithium ion secondary battery electrolyte. The electrolyte comprises a nonaqueous organic solvent, a lithium salt and an additive, wherein the nonaqueous organic solvent comprises fluoroether as shown in the structural formula I, and the additive comprises phosphoric cyclic anhydride as shown in the structural formula II. In the structural formula I, Af1 is selected from afluorine-containing alkyl group with carbon number of being 2-3, and Af2 is selected from a fluorine-containing alkyl group with carbon number of being 2-4. In the structural formula II, A1, A2 and A3 are separately selected from one of an alkyl group, a fluorine-containing alkyl group, an allyl group and a phenyl group.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte solution of a lithium ion secondary battery and a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary battery is the most competitive battery of the new generation, known as "green energy", and is the preferred technology to solve contemporary environmental pollution and energy problems. In recent years, lithium-ion secondary batteries have achieved great success in the field of high-energy batteries, but consumers still expect batteries with higher comprehensive performance, which depends on the research and development of new electrode materials and electrolyte systems. At present, electronic digital products such as smartphones and tablet computers have higher and higher energy density requirements for batteries, making it difficult for commercial lithium-ion secondary batteries to meet the requirements. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M10/058Y02E60/10Y02P70/50
Inventor 占孝云林建安伟峰周德华骆兆军
Owner SHENZHEN BAK POWER BATTERY CO LTD
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