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Nonaqueous electrolyte solution and lithium ion battery

A non-aqueous electrolyte and non-aqueous technology, applied in non-aqueous electrolytes, secondary batteries, organic electrolytes, etc., can solve problems such as passivation film thickness, affecting lithium-ion battery storage performance and cycle performance, and molecular chain breakage. Achieve the effects of preventing continuous reaction, improving rate charging performance, and inhibiting oxidation reaction

Active Publication Date: 2017-01-18
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the heterocyclic compound undergoes electropolymerization, it will generate hydrogen ions, and the excess hydrogen ions will be combined with LiFP 6 Continuously react with the SEI film generated by the negative electrode, thereby affecting the storage performance and cycle performance of lithium-ion batteries
[0005] The Chinese patent technical document CN103779607A published on May 7, 2014 discloses that cyclic phosphoric anhydride can form a polymer film on the surface of the positive electrode material to enhance the stability of the positive electrode interface, but the passivation film formed by the cyclic phosphoric anhydride is relatively thick, and its The product is a phosphate polymer, and a small amount of water in the lithium-ion battery will break the molecular chain of the phosphate polymer

Method used

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  • Nonaqueous electrolyte solution and lithium ion battery
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  • Nonaqueous electrolyte solution and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of non-aqueous electrolyte: In a glove box or a drying room, ethylene carbonate (EC) and ethyl methyl carbonate (EMC) that have been rectified, dehydrated and purified are used as a non-aqueous organic electrolyte in a volume ratio of 3:7. The solvent is mixed, and then the lithium salt LiPF is added 6 , then add the 2-methyl-2,3-dihydrothieno[3,4-b][1,4]dioxane (formula III ) and the weight percentage in the non-aqueous electrolytic solution is 1% tripropyl phosphoric acid cyclic anhydride as an additive to complete the preparation of the non-aqueous electrolytic solution.

[0035]

[0036] (2) Preparation of lithium-ion battery: The positive electrode sheet prepared by lithium cobalt oxide as the positive electrode active material, the negative electrode sheet prepared by graphite as the negative electrode active material, and the polypropylene separator are wound, outsourced with aluminum-plastic film, and injected into the above-mentioned non-aque...

Embodiment 2

[0038] Lithium-ion battery is prepared according to the same method as in Example 1, except that adding in the non-aqueous electrolytic solution is 1% 3,4-ethylenedioxythiophene (formula IV) and in the non-aqueous electrolytic solution The non-aqueous electrolytic solution contains 1% by weight tripropylphosphoric acid cyclic anhydride as an additive.

[0039]

Embodiment 3

[0041] Lithium-ion batteries were prepared in the same manner as in Example 1, except that the electrolyte solution added 2-methyl-2,3-dihydrofuro[3 with a weight percentage of 1% in the nonaqueous electrolyte solution , 4-b] [1,4] dioxane (formula V) and tripropylphosphoric acid cyclic anhydride in the non-aqueous electrolyte with a weight percentage of 1% as additives.

[0042]

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Abstract

The invention provides a nonaqueous electrolyte solution and a lithium ion battery. The nonaqueous electrolyte solution includes: a lithium salt, a nonaqueous organic solvent and an additive. The additive includes a heterocyclic compound with a structure shown as formula I and phosphoric acid cyclic anhydride with a structure shown as formula II. In the formula I, X is selected from one of S, O and NH, R1 and R2 are independently selected from any one of H, saturated alkyl with 1-10 carbon atoms, unsaturated alkyl with 1-10 carbon atoms and alkyl, or R1 and R2 are interconnected into a ring, and the H on the saturated alkyl and unsaturated alkyl can be partially or completely replaced by halogen, nitro, cyano, carboxyl, and sulfonyl. In the formula II, R3, R4 and R5 are independently selected from H, saturated alkyl with 1-20 carbon atoms, unsaturated alkyl with 1-20 carbon atoms, or a group with 6-18 carbon atoms and at least one benzene ring. The nonaqueous electrolyte solution provided by the invention can improve the rate charging performance of the lithium ion battery without affecting the storage performance and cycle performance of the lithium ion battery. (formula I and formula II).

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a non-aqueous electrolyte and a lithium-ion battery. Background technique [0002] As a working power source for electronic products, lithium-ion batteries have the characteristics of high energy density, no memory effect, and high working voltage, and are gradually replacing traditional Ni-Cd batteries and MH-Ni batteries. However, with the expansion of market demand for electronic products and the development of power and energy storage equipment, people's requirements for the energy density of lithium-ion batteries continue to increase, and the development of lithium-ion batteries with high energy density has become a top priority. [0003] In order to increase the energy density of lithium-ion batteries, developing high-voltage lithium-ion batteries is one of the effective methods. At present, lithium-ion batteries with an operating voltage above 4....

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 龙兵陈培培付成华
Owner CONTEMPORARY AMPEREX TECH CO