High-temperature lithium ion battery electrolyte and preparation method thereof and high-temperature lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as poor high-temperature performance, and achieve the effects of improving high-temperature performance, protecting electrochemical systems, and avoiding chain side reactions

Active Publication Date: 2017-11-07
HUAWEI TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In view of this, the first aspect of the present invention aims to provide a high-temperature lithium-ion battery electrolyte, which can effectively eliminate the residual trace water introduced in the battery production process and the trace water produced in the subsequent high-temperature process, and suppress the generation of HF. Protect the electrochemical system in lithium-ion batteries to solve the problem of poor high-temperature performance of existing lithium-ion batteries

Method used

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  • High-temperature lithium ion battery electrolyte and preparation method thereof and high-temperature lithium ion battery
  • High-temperature lithium ion battery electrolyte and preparation method thereof and high-temperature lithium ion battery
  • High-temperature lithium ion battery electrolyte and preparation method thereof and high-temperature lithium ion battery

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preparation example Construction

[0058] Correspondingly, the embodiment of the present invention also provides a method for preparing the above-mentioned high-temperature lithium ion battery electrolyte, which includes the following steps:

[0059] In a closed environment with a moisture content of ≤10ppm, the organic solvent is refined and purified, and lithium salt and dewatering additives are added, and mixed uniformly to obtain a high-temperature lithium ion battery electrolyte; the dewatering additive has a structural formula as shown in formula (1) The phosphoric acid cyclic anhydride compounds shown:

[0060]

[0061] Where R 1 For -NCH-(CH 2 ) n -CN group, 0

[0062] R 2 For -R 11 -CO-NR 12 R 13 Group, R 11 As-(CH 2 ) m -Group, 0≤m 12 , R 13 Independently selected from H and -(CH 2 ) x -CH 3 One of the groups, 0≤x≤19-m; m and x are integers;

[0063] R 3 Any one selected from H, F, Cl and Br.

[0064] In the embodiment of the present invention, the value range of n can be 1-10, 1-6, 2-5...

Embodiment 1

[0083] A method for preparing high-temperature lithium ion battery electrolyte includes the following steps:

[0084] In a closed environment with a moisture content of ≤10ppm, refining and purifying carbonate organic solvents and mixing them in a certain proportion EC:EMC:DMC=2:3:5 (V%), and then adding VC (1%) according to the weight ratio , PS (3%), LiDFOB (1%), SPFACA (2%), ADN (2%) additives, finally dissolved in 1.15mol / L LiPF 6 , Stir and mix uniformly to obtain the high temperature lithium ion battery electrolyte required in this embodiment.

[0085] Preparation of high temperature lithium ion battery

[0086] Preparation of positive pole piece: Lithium nickel cobalt manganese ternary material (LiNi 0.5 Co 0.2 Mn 0.3 O 2 ), conductive carbon powder (SP), polyvinylidene fluoride (PVDF) according to the weight ratio of 97:1.5:1.5 and mix uniformly, add N-methylpyrrolidone (NMP), mix and stir to obtain a positive electrode slurry with certain fluidity; , Coating the positive el...

Embodiment 2

[0090] A method for preparing high-temperature lithium ion battery electrolyte includes the following steps:

[0091] In a closed environment with a moisture content of ≤10ppm, the carbonate organic solvent is refined and purified, and then mixed uniformly in a certain proportion EC:EMC:DMC:PC=3:3:3:1 (V%), and then add VC according to the weight ratio (1%), SPFACA (1.8%), LiFSI (1%), ADN (3%) additives, and finally dissolved in 1.0mol / L LiPF 6 , Mix uniformly, and finally obtain the high temperature lithium ion battery electrolyte required in this embodiment.

[0092] Preparation of high-temperature lithium ion battery: The preparation method is exactly the same as that in Example 1.

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Abstract

The invention provides a high-temperature lithium ion battery electrolyte, which includes lithium salt, an organic solvent and a de-watering additive, which has a structural formula shown as the formula (1) in the description. In the formula (1), R1 is a -NCH-(CH2)n-CN group, 0<n<=20, R2 is a -R11-CO-NR12R13 group, R11 is a -(CH2)m- group, 0<=m<19, R12, R13 are dependently selected from one of H and -(CH2)x-CH3 group, 0<=x<=19-m, m, n, and x are integers, and R3 is selected from any one of H, F, Cl, and Br. The high-temperature lithium ion battery electrolyte can efficiently remove a trace amount of water from a battery system, inhibits HF generation, protects the electrochemical system in the battery, and obviously improves the high-temperature memory performance and high-temperature cycling performance of the lithium ion battery. The invention further provides a preparation method of the electrolyte and a high-temperature lithium ion battery containing the electrolyte.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to a high temperature lithium ion battery electrolyte and a preparation method thereof, and a high temperature lithium ion battery. Background technique [0002] Compared with traditional lead-acid and nickel-hydrogen secondary batteries, lithium-ion secondary batteries are widely used in various fields due to their advantages of high energy density, high voltage, low self-discharge rate and light weight. However, high-tech fields such as notebook computers, mobile phones, mobile tools, electric vehicles, base station backup, and drilling are increasingly demanding battery performance, and their use environments are becoming more and more demanding. Especially in the high temperature and harsh environment, such as outdoor base station backup power, drilling bit monitoring and other fields, the current commercial lithium ion secondary batteries cannot meet the requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10H01M10/0568H01M10/0569
Inventor 许国成谢封超许瑞李慧
Owner HUAWEI TECH CO LTD
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