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Functional electrolyte for improving charge-discharge efficiency of lithium ion battery and application thereof

A lithium-ion battery, charge-discharge efficiency technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low charge-discharge efficiency of lithium-ion batteries, improve charge-discharge efficiency and capacity retention rate, and improve compatibility. Effect

Inactive Publication Date: 2013-12-18
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to solve the problem of low charging and discharging efficiency of lithium-ion batteries at present, and propose a functional electrolyte solution for improving the charging and discharging efficiency of lithium-ion batteries, which is used to improve the interface performance between the positive electrode and the electrolyte, thereby improving the charging and discharging efficiency of the battery

Method used

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  • Functional electrolyte for improving charge-discharge efficiency of lithium ion battery and application thereof
  • Functional electrolyte for improving charge-discharge efficiency of lithium ion battery and application thereof
  • Functional electrolyte for improving charge-discharge efficiency of lithium ion battery and application thereof

Examples

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Embodiment 2

[0031] Table 3 shows the capacity retention rates of the batteries of Example 2 and Comparative Example 1 after 100 cycles. The capacity cycle of embodiment 2 and comparative example 1 is as follows figure 2 shown.

[0032] Table 3 Capacity retention rate of battery after 100 cycles

[0033]

Example 2

Comparative example 1

Retention rate(25℃)

99.1%

95.3%

Retention rate(55℃)

99.4%

96.4%

[0034] image 3 It can be seen that the battery of Example 2 has two semicircles in the impedance diagram, and has a smaller interface film impedance. The impedance of Comparative Example 1 has only one semicircle, and the impedance is greater than the battery impedance value of Example 2. It shows that after adding this functional additive, LiNi 0.5 mn 1.5 o 4 A dense layer of SEI film is formed on the surface of the electrode, which can avoid direct contact between the electrolyte and the electrode surface, protect the electrode...

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Abstract

The invention discloses functional electrolyte for improving the charge-discharge efficiency of a lithium ion battery. The functional electrolyte is characterized by consisting of the following components in percentage by weight: 80%-90% of an organic solvent, 0.1%-2% of functional additive, and the balance being lithium salts, wherein the lithium salts are one or more of LiPF6, LiBF4, and LiTFSI, the organic solvent is a cyclic ester compound or a chain ester compound, and the structure general expression of the functional additive is R-C6H3-(OCH3)2, wherein R is H, halogen, or -NO2, and two -OCH3 are located in ortho-position or para-position on a benzene ring. The functional electrolyte provided by the invention is applicable to the lithium ion battery made from lithium manganate, a ternary material, nickel lithium manganate and lithium titanate, and is capable of improving the charge-discharge efficiency of the lithium ion battery and further effectively increasing the capacity and prolonging the cycle life of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a functional electrolyte for improving the charging and discharging efficiency of lithium ion batteries using lithium manganate, ternary materials and nickel-manganese materials as positive electrodes and an application thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as mobile phones and notebook computers because of their high energy density, high working voltage, light weight and no environmental pollution. Therefore, its comprehensive performance requirements are relatively high. During the charging and discharging process of lithium-ion batteries, the irreversible reduction of lithium ions will reduce the charging and discharging efficiency of the battery, thereby affecting the service life of the battery. In addition, during the charging process, the local voltage at the active point on the electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0567
CPCY02E60/10
Inventor 任春燕叶学海张春丽刘红光郭西凤张晓波于晓微
Owner CHINA NAT OFFSHORE OIL CORP
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