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Anode lithium supplement agent, anode plate and method for preparing anode lithium supplement agent

A cathode sheet and lithium replenishment technology, which is applied in positive electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of unstable interface and high residual alkali in lithium replenishment technology, and achieve low surface alkalinity, high lithium replenishment capacity, and improved energy. The effect of density

Pending Publication Date: 2022-02-15
广州博粤新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly provides a positive electrode lithium supplement agent, a positive electrode sheet and a method for preparing the positive electrode lithium supplement agent, aiming to solve the technical problems of unstable interface and high residual alkali in the existing lithium supplement technology for lithium ion batteries

Method used

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  • Anode lithium supplement agent, anode plate and method for preparing anode lithium supplement agent
  • Anode lithium supplement agent, anode plate and method for preparing anode lithium supplement agent
  • Anode lithium supplement agent, anode plate and method for preparing anode lithium supplement agent

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Effect test

Embodiment 1

[0023] A kind of Li 5 Fe 0.8 Ni 0.2 o 4 The preparation of supplementary lithium agent, according to the molar ratio Fe / Ni=0.8:0.2 ratio takes Fe 2 o 3 Add NiO together to a high-energy fusion machine and fuse at 2000rpm for 20min, then press LiOH: Li 2 O mass ratio 3:7, Li / (Fe+Ni) molar ratio 5.5:1 Weigh LiOH, Li 2 O, by Fe 2 o 3 Weigh 8% of the mass of glucose and add it to a high-energy fusion machine at 300rpm and mix for 10 minutes. Put the mixed material into a corundum crucible and place it in an air atmosphere furnace. Start the temperature rise, keep it at 500°C for 6 hours, then raise the temperature to 700°C for 20 hours, and leave the furnace. After crushing and sieving, the obtained Li 5 Fe 0.8 Ni 0.2 o 4 Lithium supplements are tested for residual alkali by acid-base titration; 5 Fe 0.8 Ni 0.2 o 4 The lithium supplement was mixed with PVDF and SP, and the counter electrode was made of a lithium sheet to make a button battery for testing. The test r...

Embodiment 2

[0025] A kind of Li 5 Fe 0.7 Cu 0.3 o 4 The preparation of supplementary lithium agent, weigh Fe(OH) according to the ratio of molar ratio Fe / Cu=0.7:0.3 3 and CuO, and then both were added to a high-energy fusion machine and fused at 2000rpm for 20min, then LiOH was weighed according to the molar ratio of Li / (Fe+Cu) 5.8:1, according to Fe(OH) 3 Weigh 6% of the mass of glucose and add it to a high-energy fusion machine at 300rpm and mix for 10 minutes. Put the mixed material into a corundum crucible and place it in an air atmosphere furnace. Start the temperature rise, keep it at 450°C for 8 hours, then raise the temperature to 680°C for 20 hours. Then crush and sieve, the obtained Li 5 Fe 0.7 Cu 0.3 o 4 Lithium supplements are tested for residual alkali by acid-base titration; 5 Fe 0.7 Cu 0.3 o 4 The lithium supplement was mixed with PVDF and SP, and the counter electrode was made of a lithium sheet to make a button battery for testing. The test results are as follo...

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Abstract

The invention discloses an anode lithium supplement agent, an anode plate and a method for preparing the anode lithium supplement agent; the molecular formula of the anode lithium supplement agent is Li5FeaMbO4, where a is more than or equal to 0.1 and less than or equal to 0.9, b is more than or equal to 0.1 and less than or equal to 0.9, a + b is equal to 1, and an element M is one or more of Ni, Co, Mn and Cu; the center of the anode lithium supplement agent is Fe element, and the concentration gradient distribution of M element is realized from the center to the surface of the material. The anode lithium supplement agent is low in surface alkalinity, stable in interface and high in lithium supplement capacity, and can effectively improve the energy density of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode lithium replenishing agent, a positive electrode sheet and a method for preparing the positive electrode lithium replenishing agent. Background technique [0002] With the rapid development of lithium-ion batteries, it has penetrated into various industries, especially in the fields of 3C and electric vehicles. The ever-increasing demand for time and mileage and service life has also contributed to the continuous increase in the energy density of lithium-ion batteries. When a lithium-ion battery is charged for the first time, there will be some Li released from the positive electrode. + Instead of being embedded in the negative electrode, it participates in the formation of the SEI film on the surface of the negative electrode to consume this part of the active lithium, thereby reducing the energy density of the battery. In order t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/485H01M4/04H01M4/62H01M10/0525H01M10/42
CPCH01M4/525H01M4/505H01M4/485H01M4/0471H01M10/0525H01M4/62H01M10/4235H01M2004/028Y02E60/10
Inventor 蒋良兴刘芳洋
Owner 广州博粤新材料科技有限公司