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Negative electrode slurry, negative electrode plate, lithium ion soft package battery cell, lithium ion battery pack and application of lithium ion battery pack

A technology of negative electrode slurry and negative electrode sheet, which is applied in the field of lithium ion soft pack battery, lithium ion battery pack and its application, negative electrode sheet and negative electrode slurry, which can solve the problem of hindering the application of silicon-based high energy density negative electrode materials and low cycle lifespan and other issues

Inactive Publication Date: 2021-03-26
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a low cycle life hinders the application of silicon-based high energy density anode materials

Method used

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  • Negative electrode slurry, negative electrode plate, lithium ion soft package battery cell, lithium ion battery pack and application of lithium ion battery pack
  • Negative electrode slurry, negative electrode plate, lithium ion soft package battery cell, lithium ion battery pack and application of lithium ion battery pack

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of electrolyte

[0035] In the glove box or drying room, ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC) that have undergone rectification and dehydration are mixed according to the mass ratio EC:PC:DEC=2:3:5 Mix and then slowly add LiPF 6 to 1 mol / L, finally add 10% fluoroethylene carbonate (FEC) based on the total mass of the electrolyte, stir and mix evenly to obtain the final electrolyte.

[0036] (2) Preparation of positive electrode sheet

[0037] The positive electrode active material lithium nickel cobalt manganese LiNi 0.5 co 0.2 mn 0.3 o 2 Mix well with conductive carbon black (super-P), carbon nanotubes (CNT), and binder polyvinylidene fluoride (PVDF) at a mass ratio of 96.8:1.5:0.5:1.2, and add N-methylpyrrolidone (NMP ), stirred and mixed uniformly by a vacuum mixer to obtain a positive electrode active material slurry. The above slurry was evenly coated on both sides of the aluminum foil (thickness 12 μ...

Embodiment 2

[0044] Negative electrode slurry, negative electrode sheet and lithium ion soft-packed battery were prepared according to the method described in Example 1, the only difference being that the mass of lithium nitrate was 1% of the total mass of the negative active material.

Embodiment 3

[0046] Negative electrode slurry, negative electrode sheet and lithium ion soft-packed battery were prepared according to the method described in Example 1, the only difference being that the mass of lithium nitrate was 3% of the total mass of the negative active material.

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Abstract

The invention discloses negative electrode slurry, a negative electrode plate, a lithium ion soft package battery cell, a lithium ion battery pack and application thereof. The negative electrode slurry comprises a negative electrode active material, an additive and a solvent, the negative electrode active material comprises a silicon-based composite material, and the additive comprises lithium nitrate. The negative electrode active material comprising the silicon composite material is high in energy density, lithium nitrate has relatively high reduction potential and is easy to reduce and decompose, and the decomposition product can stably coat the surface of the negative electrode active material, plays a role in passivating the negative electrode active material, can effectively inhibitcontinuous side reaction between electrolyte and the negative electrode active material, such as electrochemical reactions, so that the cycle performance of the lithium ion soft package battery cell can be improved, and the cycle life is long.

Description

technical field [0001] The invention relates to the field of energy storage devices, in particular to a negative electrode slurry, a negative electrode sheet, a lithium ion soft pack battery cell, a lithium ion battery pack and applications thereof. Background technique [0002] In recent years, the new energy automobile industry has put forward higher and higher requirements for the performance of lithium-ion batteries, especially the energy density. At present, among various technical means to increase the energy density of lithium-ion batteries, the use of silicon-based materials for negative electrodes is becoming the most widely studied method in the industry. Using a silicon system as the negative electrode active material can greatly increase the energy density of lithium-ion batteries. For example, adding about 10% of silicon-carbon materials to the graphite negative electrode can increase the discharge capacity of the negative electrode active material from 350mAh / g...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/66H01M10/0525H01M10/42
CPCH01M4/364H01M4/386H01M4/62H01M4/667H01M10/0525H01M10/4235Y02E60/10
Inventor 王晓东王群峰梅骜李进李扬
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD
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