High-nickel ternary lithium ion battery electrolyte and ternary lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve problems such as hindering lithium ion migration, transition metal ion dissolution, and entering ion dissolution, so as to improve internal dynamic characteristics and inhibit Reduction reaction decomposition, the effect of improving electrochemical performance

A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve problems such as hindering lithium ion migration, transition metal ion dissolution, and entering ion dissolution, so as to improve internal dynamic characteristics and inhibit Reduction reaction decomposition, the effect of improving electrochemical performance

CN112216862AInactive Publication Date: 2021-01-12SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • High-nickel ternary lithium ion battery electrolyte and ternary lithium ion battery
  • High-nickel ternary lithium ion battery electrolyte and ternary lithium ion battery
  • High-nickel ternary lithium ion battery electrolyte and ternary lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Electrolyte preparation: In a glove box filled with argon, ethylene carbonate, diethyl carbonate and ethyl methyl carbonate were mixed according to the mass ratio of EC:DEC:EMC=30:20:50, and then mixed Slowly add 12.5wt% lithium hexafluorophosphate and 0.8wt% lithium difluorophosphate to the solution, and finally add 1.0wt% lithium oxalate phosphate additive (compound 1) accounting for the total mass of the electrolyte, and stir evenly to obtain the lithium ion battery of Example 1 electrolyte.

[0034] Preparation of lithium-ion batteries:

[0035] The positive electrode active material LiNi 0.6 co 0.2 mn 0.2 o 2 , conductive agent acetylene black, binder polyvinylidene fluoride (PVDF) according to the mass ratio of 96:2:2 in the N-methylpyrrolidone solvent system after fully stirring and mixing evenly, coated on the aluminum foil and dried, cold pressed , to obtain the positive electrode sheet.

[0036] Negative electrode active material artificial graphite, con...

Embodiment 2-8

[0039] Embodiment 2-8 and comparative example 1-7

[0040] In Examples 2-8 and Comparative Examples 1-7, except that the composition ratio of the components of the electrolyte solution is added as shown in Table 1, the others are the same as in Example 1.

[0041] Table 1 embodiment 1-8 and the composition ratio of each component of the electrolyte of comparative example 1-7

[0042]

[0043]

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a ternary lithium ion battery non-aqueous electrolyte and a lithium ion battery. The ternary lithiumion battery electrolyte comprises a non-aqueous organic solvent, an electrolyte lithium salt and an additive, the additive comprises an oxalic acid lithium phosphate additive with a structure shown ina formula (I), and can also comprise conventional additives such as vinylene carbonate (VC), 4-vinyl-1,3-dioxolan-2-one (VEC), 1, 3-propane sultone (PS), ethylene sulfate (DTD), tris (trimethylsilane) phosphate (TMSP) and the like. Under the combined action of the uniquely combined conventional additive and the oxalic acid lithium phosphate additive with the structure shown in the formula (I), the generation of cracks in positive electrode material particles in the circulation process can be inhibited, the dissolution of transition metal elements at high temperature can be reduced, the reduction reaction decomposition of a solvent on a negative electrode interface can be inhibited, the cycle performance, the high-temperature storage performance and the low-temperature performance of the ternary lithium ion battery are effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a ternary lithium ion battery electrolyte and a ternary lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, power tools, electric vehicles, aerospace and other fields due to their high operating voltage, high energy density, long life, wide operating temperature range, and environmental friendliness. Especially in the 3C digital field, in recent years, mobile electronic devices, especially smart phones, have been developing rapidly towards lighter and thinner, which puts forward higher requirements for the energy density of lithium-ion batteries. [0003] In order to improve the energy density of lithium-ion batteries, a common measure is to increase the charge cut-off voltage of the positive electrode material, such as the commercial lithium cobalt oxide battery voltage from 4.2V→4.35V→4.4V→4.45V→4.48V→4....

Claims

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Application Information

Patent Timeline
12 Jan 2021
Publication
CN112216862A
IPC
H01M10/0525; H01M10/0567
CPC
H01M10/0525; H01M10/0567; Y02E60/10
Inventors
潘立宁; 朱学全