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Electrolyte containing oxalic acid lithium phosphate and lithium ion battery adopting electrolyte

A technology for lithium oxalate phosphate and lithium ion batteries, which is applied in the field of electrolytes containing lithium oxalate phosphate, can solve problems such as increased internal resistance of batteries, achieve the effects of reducing internal resistance of batteries and prolonging service life

Active Publication Date: 2017-02-22
宁德市凯欣电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, excessive use of these additives in the electrolyte often leads to an increase in the internal resistance of the battery, which has a greater negative impact on the rate-type battery.

Method used

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  • Electrolyte containing oxalic acid lithium phosphate and lithium ion battery adopting electrolyte
  • Electrolyte containing oxalic acid lithium phosphate and lithium ion battery adopting electrolyte
  • Electrolyte containing oxalic acid lithium phosphate and lithium ion battery adopting electrolyte

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specific Embodiment approach

[0037] A kind of electrolytic solution containing lithium oxalate phosphate, described electrolytic solution is mainly formulated by following components: electrolyte lithium salt, lithium oxalate phosphate, non-aqueous organic solvent and other additives, the structural formula of described lithium oxalate phosphate is as follows ( I):

[0038]

[0039] The concentration of the electrolyte lithium salt in the electrolyte is 0.5-2mol / L;

[0040] The mass percentage of the lithium oxalate phosphate in the electrolyte is 0.1-10%;

[0041] The mass percent content of the other additives in the electrolyte is 0.5%-10%.

[0042] The lithium oxalate phosphate is also an additive.

[0043] The electrolyte lithium salt is LiBF 4 、LiPF 6 , LiAsF 6 , LiClO 4 , LiSO 3 CF 3 , LiB(C 2 o 4 ) 2 、LiBF 2 C 2 o 4 , LiN(SO 2 CF 3 ) 2 or LiN(SO 2 F) 2 One or more of them are mixed in any proportion.

[0044] Non-aqueous organic solvents include ethylene carbonate (EC), prop...

Embodiment 1

[0064] Electrolyte preparation

[0065] in an argon atmosphere glove box (H 2 O6 (1.0M) mixed, then add vinylene carbonate (VC), fluoroethylene carbonate (FEC), adiponitrile (ADN) and lithium oxalate phosphate, fully stir evenly, obtain the lithium ion battery of the present invention Electrolyte (tested, free acid <20ppm, moisture <20ppm). Wherein, the organic solvent is formed by mixing the following components in the following mass ratio: EC (ethylene carbonate): EMC (ethyl methyl carbonate): DEC (diethyl carbonate)=30:40:30, vinylene carbonate ( The mass percentage of VC) in the electrolyte is 1%, the mass percentage of fluoroethylene carbonate (FEC) in the electrolyte is 2%, and the mass percentage of adiponitrile (ADN) in the electrolyte The content is 2%, and the mass percent content of lithium oxalate phosphate in the electrolyte is 0.5%.

Embodiment 2-10

[0067] Examples 2-8 are also specific examples of electrolyte preparation. Except for the parameters in Table 1, other parameters and preparation methods are the same as in Example 1.

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Abstract

The invention relates to an electrolyte containing oxalic acid lithium phosphate. The electrolyte is mainly prepared from the following components: an electrolyte lithium salt, oxalic acid lithium phosphate, a non-aqueous organic solvent and other additives, wherein the structural formula of the oxalic acid lithium phosphate is as shown in the specification: FORMUAL (I). The invention provides a novel lithium ion battery electrolyte, namely the electrolyte containing oxalic acid lithium phosphate. When the oxalic acid lithium phosphate is applied to the lithium ion battery electrolyte, formation of a more stable passivation film on the surface of a negative electrode and a positive electrode can be facilitated; and it is specifically embodied that the battery has high cycle performance and capacity recovery rate at the room temperature and a high temperature, as well as relatively low internal resistance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrolyte solution containing lithium oxalate phosphate and a battery using the lithium salt. Background technique [0002] Lithium-ion batteries have high operating voltage, high specific energy density, long cycle life, low self-discharge rate, no memory effect, and low environmental pollution. They have been widely used in various consumer electronics and power battery markets. The electrolyte is an important part of the lithium-ion battery. The electrolyte generally uses a mixed cyclic and linear carbonate system to take into account properties such as viscosity, solubility, and conductivity, and various functional additives to meet the needs of lithium-ion batteries. comprehensive performance. [0003] Functional additives include film-forming additives, anti-overcharge additives, stabilizers, flame-retardant additives, etc. Among them, film-forming additives are w...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567H01M10/0568
CPCH01M10/0525H01M10/0567H01M10/0568Y02E60/10
Inventor 廖帅玲王盛温雄吴良煜
Owner 宁德市凯欣电池材料有限公司
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