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A lithium-ion battery with high cycle performance and high safety performance

A lithium-ion battery, cycle performance technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as increased solubility, structural instability, thermal instability, etc., to achieve cycle performance and safety. high effect

Active Publication Date: 2021-06-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This structural change is caused by transition metal ions migrating into the lithium layer during charge and discharge, these phase transitions are accompanied by changes in lattice constant and volume, which release oxygen from the lattice, resulting in thermal and structural instability
In addition, Ni, which has strong oxidizing properties, especially when charged at high voltage 4+ Increased solubility of ionic species in the electrolyte leading to safety concerns and deterioration of electrochemical performance

Method used

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  • A lithium-ion battery with high cycle performance and high safety performance
  • A lithium-ion battery with high cycle performance and high safety performance
  • A lithium-ion battery with high cycle performance and high safety performance

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Experimental program
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Effect test

Embodiment 1

[0038] 1. Preparation of cathode materials for lithium-ion batteries:

[0039] Preparation [(Ni 0.5 co 0.2 mn 0.3 )](OH) 2 Precursor:

[0040] Weigh the NiSO with stoichiometric ratio (5:2:3) 4 、CoSO 4 and MnSO 4 , added to distilled water to form a mixed solution with a concentration of 2.0 mol / L. Prepare 1mol / L NH 3 ·H 2 O solution and 4.0mol / L NaOH solution, pass the mixed solution into the co-precipitation reactor, at the same time, add 4.0mol / L NaOH solution and 1mol / L NH 3 ·H 2 O solution as a chelating agent (NaOH and NH 3 ·H 2 (2 mol ratio is 2:1), keep reactor temperature constant, control stirring speed. The feeding speed is controlled at 0.8-1L / h, the stirring rate is controlled at about 300r / min, the temperature is controlled at 55±2°C, the pH value is 10.5, and the aging time of the final liquid-phase co-precipitation product is determined to be 8h to obtain nickel-cobalt Manganese composite hydroxide [(Ni 0.5 co 0.2 mn 0.3 )](OH) 2 ; Prepared ac...

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Abstract

The invention relates to a lithium-ion battery with high cycle performance and high safety performance, which uses Al 2 o 3 Coated LiNi 0.6 co 0.2 mn 0.2 o 2 As the positive electrode material, graphite is used as the negative electrode material, the porous polyethylene film is used as the separator, and the lithium salt LiPF containing 1.0mol / L 6 The DMC / EC / EMC mixed solution is prepared as the electrolyte. The lithium battery of the invention has a capacity retention rate of 84.62% after 2500 cycles at a charge-discharge rate of 1C (2.5-4.3V), and the cycle performance and safety of the battery are high.

Description

[0001] (1) Technical field [0002] The invention relates to a lithium ion battery with high cycle performance and high safety performance. [0003] (2) Background technology [0004] Lithium-ion battery is a secondary battery that mainly relies on the migration of lithium ions between the positive and negative electrodes of the battery to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes. Stimulated by multiple factors such as continuous breakthroughs in key technologies and industrial policy dividends, the business of power batteries and energy storage batteries has grown like a prairie fire, and my country's lithium battery industry has shown a thriving trend. The growing demand for high-energy and high-safety lithium-ion batteries (LIBs) has stimulated enormous research interest in cathode materials for LIBs. Cathode materials for next-generation lithium-ion batteries need to have higher energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/42H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525H01M10/4235Y02E60/10
Inventor 杜小红李国华高云芳王俊
Owner ZHEJIANG UNIV OF TECH