SiO<2> coated Co<2+>-Cu<2+> doped amorphous nickel nitrate lithium battery negative electrode material and preparation method thereof

A technology of lithium nickel nitrate and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as rate performance, difficulty in maintaining cycle capacity, affecting battery performance, dissolution, etc., to improve comprehensive electrochemical performance, improve Lithium ion conductivity, the effect of extending diffusion migration channels

Inactive Publication Date: 2017-04-26
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still very difficult to take into account the rate performance and cycle capacity retention performance of the material.
The main reasons are as follows: 1. When the redox reaction occurs, the electrode material should have fast lithium ion intercalation and deintercalation and electronic conduction, that is, it should have good electronic conductivity and ion conductivity at the same time. Many negative electrode materials have high However, it is an electronic insulator, which greatly increases the polarization of the battery; 2. Many electrode materials have a large volume change during the process of lithium ion intercalation and deintercalation, resulting in electrode material particles The broken and effective electrode materials are lost during the cycle, and the large volume change also brings about the transformation of the material lattice during the charging and discharging process to produce a second phase, which seriously affects the perfor

Method used

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  • SiO&lt;2&gt; coated Co&lt;2+&gt;-Cu&lt;2+&gt; doped amorphous nickel nitrate lithium battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: the cobalt nitrate hexahydrate of nickel nitrate hexahydrate, the amount of 0.5% copper nitrate hexahydrate nickel nitrate substance, the amount of 0.5% of nickel nitrate hexahydrate substance are dissolved in deionized water to form a total metal ion concentration of 0.5mol·L -1 The solution; This solution of equal mass is mixed with hexanaphthene, is added the CTAB that the liquid mass percentage after mixing is 0.5%, the n-butanol that the liquid mass percentage after mixing is 0.1%, stirs 5 minutes with the rotating speed of 500 rev / min After standing still for 5 minutes, then add 0.5% tetraethyl orthosilicate in the amount of nickel nitrate hexahydrate and stir at a speed of 120 rpm for 2 minutes and then let stand for 3 hours; min -1 The speed is passed into the injection port of the spray dryer through the peristaltic pump, and other operating conditions are: the air intake is 0.5m 3 min -1 , The air inlet temperature is 100°C, and the air outlet...

Embodiment 2

[0014] Embodiment 2: the copper nitrate trihydrate of the amount 5% of nickel nitrate hexahydrate, nickel nitrate hexahydrate, the cobalt nitrate hexahydrate of the amount of nickel nitrate hexahydrate 5% are dissolved in deionized water to form a total metal ion concentration of 1.5mol·L -1 The solution; This solution of equal mass is mixed with hexanaphthene, is added the CTAB that the liquid mass percentage after mixing is 3.0%, the n-butanol that the liquid mass percentage after mixing is 1.0%, stirs 15 minutes with the rotating speed of 900 rev / min After standing still for 10 minutes, then add tetraethyl orthosilicate with the amount of nickel nitrate hexahydrate 5% while stirring at a speed of 200 rpm for 5 minutes and then let stand for 10 hours; min -1The speed is passed into the injection port of the spray dryer through the peristaltic pump, and other operating conditions are: the air intake volume is 3.5m 3 min -1 , The air inlet temperature is 130°C, and the air ...

Embodiment 3

[0015] Embodiment 3: nickel nitrate hexahydrate, nickel nitrate hexahydrate amount 3% copper nitrate trihydrate, nickel nitrate hexahydrate amount 3% cobalt nitrate hexahydrate are dissolved in deionized water to form a total metal ion concentration of 1.0mol·L -1 The solution; This solution of equal mass is mixed with hexanaphthene, is added the CTAB that liquid mass percentage is 1.0%, the n-butanol that liquid mass percentage is 0.5% after mixing, stirs 10 minutes with the rotating speed of 600 rev / min After standing still for 8 minutes, then add tetraethyl orthosilicate in an amount of 3% nickel nitrate hexahydrate while stirring at a speed of 160 rpm for 4 minutes and then let stand for 6 hours; min -1 The speed is passed into the sample inlet of the spray dryer through the peristaltic pump, and other operating conditions are: the air intake is 2.5m 3 min -1 , The temperature of the air inlet is 120°C, and the temperature of the air outlet is 85°C; the collected solid ...

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Abstract

The invention discloses a SiO<2> coated Co<2+>-Cu<2+> doped amorphous nickel nitrate lithium battery negative electrode material. The preparation process is as follows: coating SiO<2> on Co<2+>-Cu<2+> doped amorphous nickel nitrate particles in combination with a micro-emulsion and a spray-drying method, thereby resisting the erosion of an electrolyte; and then, under a high vacuum condition, removing crystallization water in a system by adopting a special heat treatment step to form the SiO<2> coated Co<2+>-Cu<2+> doped amorphous nickel nitrate lithium battery negative electrode material. As Co<2+> is doped in the system, the electronic conductivity of the system is improved; with Cu<2+> ions, a Ni-O space structure is enabled to produce distortion and a lithium ion diffusion-migration channel is expanded so that the electric conductivity of lithium ions is improved; the particularly beneficial effect is that the material is amorphous and is isotropic, thereby being conductive to rapid conduction of the lithium ions; and thus, the overall electrochemical performance of nickel nitrate is greatly improved.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing a high-performance nickel nitrate composite lithium battery negative electrode material. Background technique [0002] Lithium-ion secondary batteries have the absolute advantages of high volume, weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. Currently, the global mobile power market has an annual share of more than 30 billion US dollars and Gradually grow at a rate of more than 10%. Especially in recent years, with the gradual depletion of fossil energy, new energy sources such as solar energy, wind energy, and biomass energy have gradually become alternatives to traditional energy sources. Among them, wind energy and solar energy are intermittent, and a large amount of energy is used simultaneously to meet the needs of continuous power supply. Energy storage batteries; urban air quality problems caused...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 方敏华水淼李月陈超李弯弯舒杰任元龙
Owner NINGBO UNIV
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