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Lithium ion battery employing non-aqueous electrolyte

A lithium-ion battery and non-aqueous electrolyte technology, which is applied in the field of lithium-ion batteries, can solve problems such as difficulty in taking into account low-temperature performance of the battery, failure to achieve cycle life, and large VC impedance, so as to improve cycle life, reduce impedance, and improve low-temperature performance Effect

Inactive Publication Date: 2016-09-28
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impedance of VC is relatively large, and it is difficult to take into account the low-temperature performance of the battery. With the increasing demand for battery life in the market, only using VC can no longer meet the requirements of cycle life.

Method used

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  • Lithium ion battery employing non-aqueous electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Preparation of electrolyte

[0037] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, then add 1% vinylene carbonate (VC), 0.5% vinyl sulfate (DTD), and 1% fluorobenzene as additives based on the total mass of the electrolyte.

[0038] 2) Preparation of positive plate

[0039] Mix the positive electrode active material LiFePO according to the mass ratio of 93:4:3 4 , 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 aluminum foil, dried, calendered and vacuum-dried, and an aluminum lead-out wire is welded on by an ultrasonic welder to obtain a positive plate with a thickness of 120-150 μm.

[0040] 3) Preparation of negative plat...

Embodiment 2

[0057] As shown in Table 1, except that additives are replaced by 2% vinylene carbonate (VC), 1% vinyl sulfate (DTD), and 5% fluorobenzene in the preparation of the electrolyte, the other is the same as in Example 1. Similarly, the data of normal temperature cycle performance, high temperature storage performance and low temperature performance obtained from the test are shown in Table 3.

Embodiment 3

[0059] As shown in Table 1, except that additives are replaced by 3% vinylene carbonate (VC), 3% ethylene sulfate (DTD), and 10% fluorobenzene in the preparation of the electrolyte, other and embodiment 1 Similarly, the data of normal temperature cycle performance, high temperature storage performance and low temperature performance obtained from the test are shown in Table 3.

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Abstract

The invention discloses a lithium ion battery employing non-aqueous electrolyte. The lithium ion battery comprises a cathode, an anode, a diaphragm arranged between the cathode and the anode, and the non-aqueous electrolyte of the lithium ion battery, wherein an active substance of the cathode comprises LiFePO4; the non-aqueous electrolyte of the lithium ion battery comprises a non-aqueous organic solvent, lithium salt and an additive; the additive at least comprises (A) vinylene carbonate, and also comprises at least one of (B) a compound shown in astructural formula 1 and (C) fluorobenzene, wherein n is a natural number from 1 to 3, and R1, R2, R3 and R4 are independently selected from one of alkyl groups with 1 to 6 hydrogen atoms, fluorine atoms and carbon atoms respectively. The lithium ion battery has long cycle life and excellent high / low-temperature performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a LiFePO 4 Lithium-ion battery as positive electrode active material and including vinylene carbonate as non-aqueous electrolyte additive. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, large specific power, and long cycle life. At present, non-aqueous electrolyte lithium-ion batteries have been widely used in the field of 3C consumer electronics products, and with the development of new energy vehicles, non-aqueous electrolyte Lithium-ion batteries are also increasingly common in energy storage and power. [0003] However, with the widespread application of lithium-ion batteries, there are higher requirements for the performance of lithium-ion batteries. In order to reduce costs, lithium-ion batteries are required to have a higher cycle life; Can take into account high and low temperature performance. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/58H01M4/136H01M10/0567
CPCH01M4/136H01M4/5825H01M10/0525H01M10/0567H01M2220/20H01M2220/30H01M2300/0025Y02E60/10H01M2300/004H01M4/5835H01M10/0569H01M2004/021H01M2004/027H01M2004/028H01M50/46
Inventor 石桥林木崇胡时光张海玲郭琦
Owner SHENZHEN CAPCHEM TECH CO LTD
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