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A kind of multifunctional high-voltage lithium-ion battery electrolyte and high-voltage lithium-ion battery

A lithium-ion battery and electrolyte technology, applied in the direction of secondary battery, composite electrolyte, secondary battery repair/maintenance, etc., can solve the problems of increasing and deteriorating battery cycle performance, increasing impedance, etc., and achieve the purpose of suppressing the increase of negative electrode impedance, Effect of suppressing decomposition and increasing exchange rate

Active Publication Date: 2021-08-27
浙江锂威能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the dissolved metal ions continue to deposit on the negative electrode during the cycle, resulting in increased polarization of the negative electrode, increased impedance, and deteriorated battery cycle performance.

Method used

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  • A kind of multifunctional high-voltage lithium-ion battery electrolyte and high-voltage lithium-ion battery
  • A kind of multifunctional high-voltage lithium-ion battery electrolyte and high-voltage lithium-ion battery
  • A kind of multifunctional high-voltage lithium-ion battery electrolyte and high-voltage lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Electrolyte preparation: In an argon-filled glove box (moisture 6 ) and 0.5wt% lithium bisoxalate borate (LiBOB) based on the total weight of the electrolyte, and finally add 0.5wt% additive B (compound having a structure shown in formula I or formula II) based on the total weight of the electrolyte, 0.5wt% carbonic acid Vinylene ester (VC), 5.0wt% fluoroethylene carbonate (FEC), 2.0wt% adiponitrile (ADN) and 1.0wt% hexanetrinitrile (HTCN), after stirring uniformly, obtain the lithium ion of Example 1 battery electrolyte.

[0025] Preparation of soft pack battery: the positive electrode sheet (active material LiCoO 2 ), diaphragm, and negative electrode sheet (active material graphite) are stacked in order, so that the diaphragm is in the middle of the positive and negative electrode sheets, and the bare cell is obtained by winding; the bare cell is placed in an aluminum-plastic film outer packaging, and the electrolytic Liquid injection into the dried battery, packagi...

Embodiment 2-9

[0026] Embodiment 2-9 and comparative example 1-4

[0027] In Examples 2-9 and Comparative Examples 1-4, except that the proportions of the components of the electrolyte are added as shown in Table 1, the others are the same as in Example 1. In addition, the structural formula of additive B in each embodiment is shown in Table 2.

[0028] Table 1 Embodiment 1~9 and the composition ratio of each component of the electrolyte solution of comparative examples 1~4

[0029]

[0030]

[0031] The concrete material of additive B is illustrated in the embodiment of table 2

[0032]

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a multifunctional high-voltage lithium ion battery electrolyte, including electrolyte lithium salt, non-aqueous organic solvent and additives, and the additives include additive A and additive B, and the additive A is A high voltage additive, the additive B is a compound additive having a structure of formula I or formula II. In addition, the invention also relates to a high-voltage lithium-ion battery. Compared with the prior art, the invention effectively eliminates the acid and moisture in the electrolyte, and improves the high-temperature storage performance and high-temperature cycle performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a multifunctional high-voltage lithium-ion battery electrolyte and a high-voltage lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used because of their high working voltage, high specific energy, long cycle life and no memory effect. At present, lithium-ion batteries have been widely used in the field of 3C digital consumer electronics products. With the advent of the 5G era, people have put forward higher requirements for the energy density of lithium-ion batteries. Improving the charging cut-off voltage of lithium-ion batteries is one of the important means to increase energy density. [0003] However, as the charge cut-off voltage increases and lithium ions continue to be extracted, the lattice oxygen activity on the surface of the positive electrode continues to increase and overflow, and the stability of the metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0088Y02E60/10
Inventor 熊伟徐宝邓卫龙杨山郑明清陈杰李载波项海标
Owner 浙江锂威能源科技有限公司
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