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High-energy-density sodium ion battery

A sodium-ion battery, high energy density technology, applied in the manufacture of battery electrodes, secondary batteries, electrolyte batteries, etc., can solve the problems of low energy density, low Coulomb efficiency, and insufficient capacity of low-potential platforms in sodium-ion batteries, and achieves the goal of advancing The commercialization process, the low reaction temperature, the effect of solving the low first coulombic efficiency and the insufficient capacity of the low potential platform

Pending Publication Date: 2022-04-19
925 CARBON FOREVER TECH (TIANJIN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the hard carbon material has a suitable pore structure and fully retains the abundant nanopores inside, it can solve the technical bottlenecks of the first coulombic efficiency of the hard carbon negative electrode material, insufficient capacity of the low-potential platform, and low energy density of the sodium-ion battery, and promote the development of sodium-ion batteries. The commercialization process of batteries

Method used

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Examples

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Embodiment 1

[0037] This embodiment provides a high-energy-density sodium-ion battery, including a positive electrode, a negative electrode, and an electrolyte, wherein the active material of the negative electrode is a hard carbon material with abundant nanopores and a pore size smaller than 0.4 nm.

[0038] The preparation method of the hard carbon negative electrode material at least comprises the following steps:

[0039] In the first step, microporous activated carbon (precursor is bitumen, specific surface area is 1313m 2 / g) into a tube furnace, the flow rate is 90mL / min protective gas argon, and the temperature is raised to a final temperature of 900°C at a heating rate of 5°C / min;

[0040] In the second step, under the final temperature condition of 900°C, methane gas with a flow rate of 10mL / min is introduced to carry out chemical vapor deposition;

[0041] In the third step, after constant temperature reaction for 1 hour, the methane gas was cut off, and the temperature was low...

Embodiment 2

[0047] The difference with embodiment 1 is:

[0048] In the preparation method of the hard carbon negative electrode material, methane gas is cut off after constant temperature reaction for 5 hours; the rest is the same as that of Example 1, and will not be repeated here.

Embodiment 3

[0050] The difference with embodiment 1 is:

[0051] In the preparation method of the hard carbon negative electrode material, the microporous activated carbon YP80 (the precursor is coconut shell, the specific surface area is 2538 m 2 / g) into a tube furnace, after a constant temperature reaction for 10 hours, cut off the methane gas; the rest is the same as in Example 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a high-energy-density sodium-ion battery which comprises a positive electrode, a negative electrode and an electrolyte, and an active material of the negative electrode is a hard carbon material with rich nano-pore channels and a main body pore size of less than 0.4 nm. Compared with the prior art, the preparation method has the advantages that reasonable porous carbon and precursor are selected, the pore size is controlled to be below 0.4 nm, and abundant nano pore channels inside are fully reserved, so that the technical bottlenecks of low initial coulombic efficiency and insufficient low-potential platform capacity of a hard carbon negative electrode material can be solved, and the commercialization process of a sodium-ion battery is promoted.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, in particular to a high energy density sodium ion battery. Background technique [0002] With the rapid development of the electric vehicle industry and renewable energy around the world, large-scale energy storage technology has become the key to restricting its sustainable development. The main avenue of Continuity Contradictions. Electrochemical devices represented by lithium-ion batteries are widely used in the field of energy storage due to their high energy density and efficiency. However, the limited and uneven distribution of lithium reserves make lithium-ion batteries more costly, and frequent charging and discharging shortens their lifespan, resulting in high investment costs in large-scale energy storage fields such as base station energy storage, making it difficult to meet future scale. Application requirements. Sodium, an alkali metal element in the same family as li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054H01M10/058H01M4/04C01B32/05C01B32/372
CPCH01M4/583H01M10/054H01M10/058H01M4/0428C01B32/05C01B32/372H01M2004/027C01P2004/03C01P2004/04C01P2002/72Y02P70/50Y02E60/10
Inventor 杨全红李琦张俊贾怡然张一波杨涵陶莹
Owner 925 CARBON FOREVER TECH (TIANJIN) CO LTD
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