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A non-aqueous electrolyte and a lithium-ion battery

A non-aqueous electrolyte, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems affecting the battery management system's prediction of the battery's charge and discharge state, the average discharge voltage drop, and the battery output power reduction, etc. Nuclear attack capability, alleviating voltage hysteresis, anti-oxidative and non-combustible effects

Active Publication Date: 2019-02-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • 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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  • A non-aqueous electrolyte and a lithium-ion battery
  • A non-aqueous electrolyte and a lithium-ion battery
  • A non-aqueous electrolyte and a lithium-ion battery

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preparation example Construction

[0109] The invention also provides a method for preparing the non-aqueous electrolyte, which includes 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 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, including a positive electrode, a separator, a negative electrode, an electrolyte, and a battery casing. The electrolyte is the above-mentioned non-aqueous electrolyte.

[0113] The present invention has no special restrictions on the material of the lithium ion battery cathode, preferably S, O 2 One of layered oxide materials, spinel cathode materials, polyanionic compounds, and lithium-rich manganese-based oxide cathode materials.

[0114] The lay...

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 cathode materials, and the negative electrode is selected from silicon-based anode materials to obtain a lithium ion battery. The performance is measured. The results are shown in Table 1, Table 1. It is the electrolyte formula and performance test results of lithium-ion batteries.

[0131] Table 1 The electrolyte formulation 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 represented by formulas 4 to 6, the positive electrode is selected from lithium-rich manganese-based cathode materials, and the negative electrode is selected from silicon-based anode materials. The lithium ion battery was obtained and its performance was measured. The results are shown in Table 2. Table 2 shows the electrolyte formulation and performance test results of the lithium ion battery.

[0136] Table 2 The electrolyte formulation and performance test results in lithium-ion batteries

[0137]

[0138]

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PUM

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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 specifically relates to a non-aqueous 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. The high energy density lithium ion battery is limited by the specific capacity of the cathode material. Therefore, the development of high-capacity cathode materials is extremely urgent. [0003] Rich lithium xLi 2 MnO 3 -(1-x)LiMO 2 (M=Co, Ni, Mn) has high specific capacity (up to 300mAh g -1 ), high safety and low cost has become a hot spot in the research of lithium ion battery cathode materials. However, the most important problem with lithium-rich cathodes is voltage hysteresis, that is, the average discharge voltage is shown on the charge-discharge curve as the number of cycles increases. In the actua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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