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Method for measuring carbon content in carbon-cladding lithium iron phosphate positive electrode material

A technology for carbon-coated lithium iron phosphate and cathode materials, which is applied in material weighing, analyzing materials, measuring devices, etc., can solve the problems of reducing compaction density, affecting the gram capacity of materials, increasing the difficulty of coating process, etc. Simple steps and low cost effect

Inactive Publication Date: 2011-04-27
SHENZHEN BAK BATTERY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The participation of carbon does improve the conductivity of the material, but the level of the content directly affects the gram capacity of the material, high-rate cycle performance and other links. At the same time, a higher carbon content also seriously reduces the compaction density and increases the coating density. Difficulty of craft

Method used

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  • Method for measuring carbon content in carbon-cladding lithium iron phosphate positive electrode material
  • Method for measuring carbon content in carbon-cladding lithium iron phosphate positive electrode material
  • Method for measuring carbon content in carbon-cladding lithium iron phosphate positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Accurately weigh 7.855g of carbon-coated lithium iron phosphate cathode material and place it in a clean beaker, then add an appropriate amount of 0.01mol / L acetic acid solution, complete the reaction at 90°C, filter, and wash repeatedly with distilled water for 10 times , and finally placed in an oven at 100°C and weighed (recorded as 0.332g), the carbon content formula: carbon content (%)=0.332 / 7.855×100%=4.23%.

Embodiment 2

[0033] Accurately weigh 13.930g of carbon-coated lithium iron phosphate cathode material and place it in a clean beaker, then add an appropriate amount of 100mol / L acetic acid solution, carry out a complete reaction at 10°C, then filter and wash repeatedly with distilled water for 15 times, Finally put it in an oven at 100°C and weigh it (recorded as 0.985g). The carbon content formula is: carbon content (%)=0.985 / 13.930×100%=7.07%.

Embodiment 3

[0035] a) Use hydrochloric acid (HCl) with a molar concentration of 10mol / l to mix with C-LiFePO from different manufacturers A, B, and C respectively 4 Sample response.

[0036] b) Accurately weigh 10.000g of C-LiFePO4 samples from three different manufacturers A, B and C, respectively, and mark them as: M(A), M(B) and M(C).

[0037] c) Put the three samples in three 250ml clean beakers respectively, then add 100ml, 10ml / l hydrochloric acid respectively, fully react at room temperature (25°C) for 10 hours, filter, and wash repeatedly with distilled water 6 times (completely remove Soluble substances), and finally baked in an oven at 100°C for 12 hours.

[0038] d) After the three processed samples were dried, they were weighed and marked as: m(A), m(B) and m(C). The carbon content results are shown in Table 1.

[0039] Table 1

[0040]

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Abstract

The invention discloses a method for measuring the carbon content in a carbon-cladding lithium iron phosphate positive electrode material, comprising the following steps of: reacting an acid solution with the carbon-cladding lithium iron phosphate positive electrode material; and calculating percentage by mass of an insoluble solid product accounting for the original carbon-cladding lithium iron phosphate positive electrode material so as to measure the carbon content in the carbon-cladding lithium iron phosphate positive electrode material. The invention has the advantage that the carbon content in the carbon-cladding lithium iron phosphate positive electrode material can be accurately measured so as to judge the influence of the carbon content on gram capacity performance, high magnification cycle performance and compacted density of a battery.

Description

technical field [0001] The invention relates to a detection technology for the quality of the cathode material of a lithium ion battery, in particular to a measurement technology for the carbon content in the cathode material. Background technique [0002] With its advantages of high voltage (single battery 3.60V), high specific energy (100-130Wh / kg), light weight, small size, and good safety, lithium-ion batteries meet the needs of portable electronic products (mobile) to a large extent. phone, laptop, etc.) development needs. However, because the actual specific capacity of LiCoO2 positive electrode material is only 140mAh / g, and it is expensive and pollutes the environment greatly, thus limiting the application field of lithium-ion batteries. In the past ten years, people have been looking for an alternative cathode material with high capacity, low toxicity and good safety. The study of olivine-type LiFePO4 cathode materials has attracted the attention of many researche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
Inventor 相江峰
Owner SHENZHEN BAK BATTERY CO LTD