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Secondary battery negative electrode material

A negative electrode material, secondary battery technology, applied in the field of electrochemical energy storage, can solve problems such as battery design difficulties

Active Publication Date: 2015-05-27
浙江精研深蓝新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of traditional Zn / Zn 2+ electrodes, inevitably face the problem of zinc dendrites, making battery design very difficult

Method used

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  • Secondary battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0044] The preparation of embodiment 1 secondary battery

[0045] 1. Preparation of positive electrode sheet: LiMn 2 o 4 It is the positive electrode active material, according to the ratio of positive electrode active material 90%: conductive carbon black 6%: binder SBR (styrene-butadiene rubber latex) 2%: thickener CMC (sodium carboxymethyl cellulose) 2%, first put Mix CMC with a certain amount of water evenly, then add active material and conductive carbon black, stir for 2 hours, and finally add SBR and stir for 10 minutes to obtain positive electrode slurry. The positive electrode current collector is a 150 mesh SUS304 stainless steel mesh, and the positive electrode slurry is evenly coated on the positive electrode current collector, cut into a size of 10mmX10mm, and a weight of 50mg. Dry at 120°C for 12 hours to form a positive electrode sheet.

[0046] 2. Preparation of negative electrode active material: 1Kg of commercially available iminodiacetic acid chelating re...

Embodiment 2

[0052] The battery is manufactured in the same manner as in Example 1, except that the preparation method of the negative electrode active material is as follows:

[0053] Get 100 grams of sodium polyacrylate (molecular weight 10,000) and place it in 1L of deionized water, dissolve 400 grams of zinc sulfate in 1L of water, then pour it into the mixture of sodium polyacrylate and water, mix the solution for 10 hours, wash and filter, Then it is mixed with carbon black conductive agent so that the ratio is 8:1:1, and pressed into a pole piece, the mass per unit area is the same as that of the positive electrode, and the negative electrode is pasted on the zinc foil current collector.

[0054] The positive electrode of the battery uses the lithium manganate pole piece described in Example 1, the positive and negative electrodes have the same area, the mass ratio of the positive and negative electrodes is 1:1, and the electrolyte is a neutral lithium sulfate solution with pH=7.

...

Embodiment 3

[0058] The battery is manufactured in the same manner as in Example 1, except that the preparation method of the negative electrode active material is as follows:

[0059] Get 100 grams of polyacrylic acid weak acid adsorption resin (DIAION WK10, a kind of methacrylic acid type weak acid cation exchange resin, the structure is as follows Figure 7 Shown below) crushed to 400-mesh sieve, 400 grams of zinc sulfate was dissolved in 1L of water, poured into the above resin powder, the solution was mixed for 10 hours, washed and filtered, and then mixed with carbon black conductive agent, binder PTFE The powders are mixed at a ratio of 8:1:1, pressed into flakes, and pasted on the zinc foil current collector.

[0060] The positive electrode of the battery uses the lithium manganate pole piece described in Example 1, the size of the positive and negative pole pieces is the same, the mass ratio of the active material is 1:1, and the electrolyte is a neutral lithium sulfate solution w...

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Abstract

The invention discloses a secondary battery negative electrode material which comprises a framework, a chelation / adsorption radical and an active substance, wherein the framework does not participate in electrochemical reaction, and only provides a carrier for the chelation / adsorption radical; the chelation / adsorption radical comprises outer electrodes of atoms of N, S, P, O and the like, and can form a chelated / chemical adsorption bond (represented by an iminodiacetic acid chelated radical in figure) with two-valent and polyvalent metals; the active substance can be two-valent and polyvalent metal ions which can be reduced into relatively low valent. During charging, the metal ions which are taken as the active substance is reduced into a relatively-low-valent state or a metal elemental state; during discharging, the metal ions are reversely generated and form chelated / chemical adsorption bonds with the chelation / adsorption radical. The negative electrode material can be matched with a plurality of positive electrode materials to form a battery. The battery negative electrode disclosed by the invention is novel in principle and structure, expected to be applied to electric vehicles and large-scale energy storage projects due to low price and reliability.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a secondary battery negative electrode material. Background technique [0002] The current demand for energy storage technology far exceeds any time in human history. Whether it is new energy vehicles, or future wind energy, supporting solar power plants, or urban smart grids, all require a large number of reliable energy storage technologies. [0003] The current commercialized battery technology is mainly the old lead-acid battery that is harmful to the environment. The emerging lithium-ion battery has achieved great success in portable devices, but in the field of large-scale power or energy storage, due to the price, Factors such as safety are constrained. Therefore, it is a very urgent task to develop a safe and cheap rechargeable battery. [0004] In 1994, Wu Li from the research group of Jeff Dahn in Canada published an article named as VO in SC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60
CPCH01M4/36H01M4/60Y02E60/10
Inventor 颜竞
Owner 浙江精研深蓝新能源科技有限公司
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