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Nonaqueous electrolyte and lithium-ion battery

A non-aqueous electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems that affect the battery management system's prediction of battery charge and discharge status, battery output power reduction, and discharge average voltage drop, etc., to achieve good resistance Nuclear attack capability, mitigation of voltage hysteresis, anti-oxidation and non-combustible effects

Active Publication Date: 2016-06-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem of lithium-rich cathodes is the voltage hysteresis, that is, from the charge-discharge curve, the average discharge voltage decreases continuously with the increase of the number of cycles.
In the actual application process, the voltage hysteresis of the material will reduce the output power of the battery and seriously affect the prediction of the battery charge and discharge state by the battery management system

Method used

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  • Nonaqueous electrolyte and lithium-ion battery
  • Nonaqueous electrolyte and lithium-ion battery
  • Nonaqueous electrolyte and lithium-ion battery

Examples

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preparation example Construction

[0109] The present invention also provides a kind of preparation method of non-aqueous electrolyte, comprises the following steps:

[0110] The organic solvent and the lithium salt are mixed to obtain a non-aqueous electrolyte, and the organic solvent is selected from non-carbonate solvents.

[0111] Preferably, when mixing the organic solvent and the lithium salt, an additive may also be added, and the additive is preferably the first additive and / or the second additive described above.

[0112] The present invention also provides a lithium ion battery, comprising a positive electrode, a diaphragm, a negative electrode, an electrolyte and a battery case, and the electrolyte is the above-mentioned non-aqueous electrolyte.

[0113] The present invention is not particularly limited to the material of the positive electrode of the lithium ion battery, preferably S, O 2 , layered oxide materials, spinel positive electrode materials, polyanionic compounds, lithium-rich manganese-b...

Embodiment 1～9

[0129] Examples 1-9 Table 1

[0130] The organic solvent is selected from phosphorus-containing compounds with structures shown in formulas 1 to 3, the positive electrode is selected from lithium-rich manganese-based positive electrode materials, and the negative electrode is selected from silicon-based negative electrode materials to obtain a lithium-ion battery, and its performance is measured. The results are shown in Table 1, Table 1 It is the electrolyte formula and performance test results in lithium-ion batteries.

[0131] Table 1 Electrolyte formula and performance test results in lithium-ion batteries

[0132]

[0133]

Embodiment 10～18

[0134] Examples 10-18 Table 2

[0135] The organic solvent is selected from ether compounds with structures shown in formulas 4-6, the positive electrode is selected from lithium-rich manganese-based positive electrode materials, and the negative electrode is selected from silicon-based negative electrode materials. The lithium-ion battery was obtained, and its performance was measured. The results are shown in Table 2. Table 2 is the electrolyte formula and performance test results in the lithium-ion battery.

[0136] Table 2 Electrolyte formula and performance test results in lithium-ion batteries

[0137]

[0138]

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Abstract

The invention provides a nonaqueous electrolyte, which comprises an organic solvent and a lithium salt, wherein the organic solvent is selected from a non-carbonate solvent. The provided nonaqueous electrolyte has relatively good nucleophilic attack resistance; high-activity radical ions O2.<-> and these solvents are not easily subjected to nucleophilic reaction, so that Li2O loss in the material is effectively inhibited; the structure of a lithium-rich cathode material is stabilized; and the voltage hysteresis phenomenon of the material is effectively relieved. Meanwhile, the provided nonaqueous electrolyte has good oxidation resistance and non-combustible characteristics, so that a lithium-rich battery prepared from the nonaqueous electrolyte has relatively good cycle performance and relatively high safety.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nonaqueous electrolyte and a lithium ion battery. Background technique [0002] Currently, the development of lithium-ion batteries with higher energy density has become the key to the development of new energy vehicles and energy storage technologies. However, high energy density lithium-ion batteries are limited by the specific capacity of the cathode material. Therefore, the development of high-capacity cathode materials is imminent. [0003] Lithium-rich xLi 2 MnO 3 -(1-x)LiMO 2 (M=Co, Ni, Mn) have high specific capacity (up to 300mAhg -1 ), high safety and low cost have become the hotspots in the research of cathode materials for lithium-ion batteries at this stage. However, the main problem of lithium-rich cathodes is the voltage hysteresis, that is, the average discharge voltage decreases continuously with the increase of the number of cyc...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569H01M2300/0028Y02E60/10
Inventor 夏兰夏永高刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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