CN109781929A - Measure LiOH and CO in lithium hydroxide32-The potentiometric titration of content - Google Patents
Measure LiOH and CO in lithium hydroxide32-The potentiometric titration of content Download PDFInfo
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- CN109781929A CN109781929A CN201910111222.3A CN201910111222A CN109781929A CN 109781929 A CN109781929 A CN 109781929A CN 201910111222 A CN201910111222 A CN 201910111222A CN 109781929 A CN109781929 A CN 109781929A
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Abstract
The invention discloses LiOH and CO in a kind of measurement lithium hydroxide3 2‑The potentiometric titration of content, comprising the following steps: S1, prepare the HCl standard solution of 2mol/L and the HCl standard solution of 0.1mol/L；S2, lithium hydroxide is placed in titration outfit, the HCl standard solution of pure water and 2mol/L is added, stirring is to being completely dissolved to obtain prepare liquid；S3, using automatical potentiometric titrimeter, using phenolphthalein indicator and methyl orange indicator as indicator, prepare liquid is titrated as titrating solution using the HCl standard solution of 0.1mol/L.LiOH and CO in measurement lithium hydroxide proposed by the present invention3 2‑The potentiometric titration of content, method is simple and easy, and sensitivity, accuracy height and analysis efficiency are high.
Description
Technical field
The present invention relates to LiOH and CO in analysis technical field more particularly to a kind of measurement lithium hydroxide3 2-The current potential of content
Titration.
Background technique
It is excellent because of its crystal structure, dissolution characteristics etc. for the lithium hydroxide of the nickelic ternary material of NCA, NCM811/
Gesture is more able to satisfy the safety of the following lithium electric material, determines that lithium hydroxide can become the basic material of main positive electrode.For
The effective lithium content of lithium hydroxide and lithium carbonate amount in effective control ternary production technology, be badly in need of it is a kind of can be quick and easy and quasi-
Really main content LiOH and CO in analysis lithium hydroxide3 2-Method.
According to existing national standard, main content LiOH and CO in lithium hydroxide3 2-Measurement mainly use acid-base titration, point
Two steps carry out: sample is dissolved with water, first using phenolphthalein as indicator, is titrated to red disappearance with 2mol/L hydrochloric acid solution, then with first
Base orange is indicator, continue with 0.1mol/L hydrochloric acid solution be titrated to yellow be it is stable it is orange be terminal, calculate LiOH and
CO3 2-Content.But in the actual operation process, due to the relationship of manual titration operation, so that first step titration is particularly easy to
Occur having dripped excessively once drop or half, causes second step titration that can not carry out；On the other hand, the color of second step titration end-point becomes
The boundary for changing xanthochromia orange is also difficult naked eyes and determines.
Summary of the invention
Technical problems based on background technology, the invention proposes LiOH and CO in a kind of measurement lithium hydroxide3 2-Contain
The potentiometric titration of amount, method is simple and easy, and sensitivity, accuracy height and analysis efficiency are high.
LiOH and CO in a kind of measurement lithium hydroxide proposed by the present invention3 2-The potentiometric titration of content, including following step
It is rapid:
The HCl standard solution of S1, the HCl standard solution for preparing 2mol/L and 0.1mol/L；
S2, lithium hydroxide is placed in titration outfit, the HCl standard solution of pure water and 2mol/L is added, stirred to complete
Dissolution obtains prepare liquid；
S3, using automatical potentiometric titrimeter, using phenolphthalein indicator and methyl orange indicator as indicator, with 0.1mol/L's
HCl standard solution is that titrating solution titrates prepare liquid.
Preferably, in S1, during preparing the HCl standard solution of 2mol/L and the HCl standard solution of 0.1mol/L,
Using methyl red-bromocresol green as indicator, with Na2CO3For its concentration of benchmark substance accurate calibration.
Preferably, in S2, the mass volume ratio of lithium hydroxide and pure water is 2.2:25g/mL；Pure water and 2mol/L's
The volume ratio of HCl standard solution is 1:1.
Preferably, in S2, the pure water is the pure water after boiling.
Preferably, in S3, the model thunder magnetic ZDJ-4A of the automatical potentiometric titrimeter.
Preferably, in S3, the concentration of the phenolphthalein indicator is 0.8-1.2g/L；The concentration of the methyl orange indicator
For 7-12g/L.
Preferably, specific steps prepare liquid titrated in S3 are as follows: after phenolphthalein indicator is added into prepare liquid
Start to titrate, obtains a titrating solution by reaching the first equivalent point when red bleach when prepare liquid, automatical potentiometric titrimeter is certainly
The volume V1 and current potential mv1 of the titrating solution of dynamic display consumption；Then methyl orange indicator is added in Xiang Yici titrating solution, to primary
The second equivalent point is reached when titrating solution becomes orange by yellow, automatical potentiometric titrimeter shows the volume V2 of the titrating solution of consumption automatically
And current potential mv2；
LiOH and CO in lithium hydroxide is calculated separately by formula I and formula II3 2-Mass content, respectively with mass fraction
ω(LiOH)、ω(CO3 2-) indicate, unit %:
Wherein, in formula:
The concentration of the HCl standard solution of C1-2mol/L, mol/L；
The concentration of the HCl standard solution of C2-0.1mol/L, mol/L；
The quality of lithium hydroxide sample, g used in m-；
The volume of the titrating solution of the first equivalent point of V1- consumption, mL；
The volume of the titrating solution of the second equivalent point of V2- consumption, mL；
The molal weight of 23.95-LiOH, g/mol；
60-CO3 2-Molal weight, g/mol.
LiOH and CO in measurement lithium hydroxide of the present invention3 2-The potentiometric titration of content, can be realized potentiometric titrimeter
Instead of manually to content LiOH and CO main in lithium hydroxide3 2-Titrimetry, especially using concentration diluter titrating solution the case where
Under, sensitivity and accuracy are high, avoid the human error that the terminal of manual titration is judged by accident and certain operations generate, improve analysis
Efficiency and accuracy, method are simple and easy.
Specific embodiment
In the following, technical solution of the present invention is described in detail by specific embodiment.
Embodiment 1
LiOH and CO in a kind of measurement lithium hydroxide proposed by the present invention3 2-The potentiometric titration of content, including following step
It is rapid:
The HCl standard solution of S1, the HCl standard solution for preparing 2mol/L and 0.1mol/L；
S2, lithium hydroxide is placed in titration outfit, the HCl standard solution of pure water and 2mol/L is added, stirred to complete
Dissolution obtains prepare liquid；
S3, using automatical potentiometric titrimeter, using phenolphthalein indicator and methyl orange indicator as indicator, with 0.1mol/L's
HCl standard solution is that titrating solution titrates prepare liquid.
Embodiment 2
LiOH and CO in a kind of measurement lithium hydroxide proposed by the present invention3 2-The potentiometric titration of content, including following step
It is rapid:
The HCl standard solution of S1, the HCl standard solution for preparing 2mol/L and 0.1mol/L；
S2, lithium hydroxide is placed in titration outfit, the HCl standard solution of pure water and 2mol/L is added, stirred to complete
Dissolution obtains prepare liquid；
S3, using automatical potentiometric titrimeter, using phenolphthalein indicator and methyl orange indicator as indicator, with 0.1mol/L's
HCl standard solution is that titrating solution titrates prepare liquid；
Wherein, in S1, during preparing the HCl standard solution of 2mol/L and the HCl standard solution of 0.1mol/L,
Using methyl red-bromocresol green as indicator, with Na2CO3For its concentration of benchmark substance accurate calibration；
In S2, the mass volume ratio of lithium hydroxide and pure water is 2.2:25g/mL；The HCl standard of pure water and 2mol/L are molten
The volume ratio of liquid is 1:1；
In S2, the pure water is the pure water after boiling；
In S3, the model thunder magnetic ZDJ-4A of the automatical potentiometric titrimeter；
In S3, the concentration of the phenolphthalein indicator is 1.2g/L；The concentration of the methyl orange indicator is 7g/L；
The specific steps that prepare liquid is titrated in S3 are as follows: start to drip after phenolphthalein indicator is added into prepare liquid
It is fixed, a titrating solution is obtained by reaching the first equivalent point when red bleach when prepare liquid, automatical potentiometric titrimeter is shown automatically
The volume V1 and current potential mv1 of the titrating solution of consumption；Then methyl orange indicator is added in Xiang Yici titrating solution, to a titrating solution
The second equivalent point is reached when becoming orange by yellow, automatical potentiometric titrimeter shows the volume V2 and current potential of the titrating solution of consumption automatically
mv2；
LiOH and CO in lithium hydroxide is calculated separately by formula I and formula II3 2-Mass content, respectively with mass fraction
ω(LiOH)、ω(CO3 2-) indicate, unit %:
Wherein, in formula:
The concentration of the HCl standard solution of C1-2mol/L, mol/L；
The concentration of the HCl standard solution of C2-0.1mol/L, mol/L；
The quality of lithium hydroxide sample, g used in m-；
The volume of the titrating solution of the first equivalent point of V1- consumption, mL；
The volume of the titrating solution of the second equivalent point of V2- consumption, mL；
The molal weight of 23.95-LiOH, g/mol；
60-CO3 2-Molal weight, g/mol.
Embodiment 3
LiOH and CO in a kind of measurement lithium hydroxide proposed by the present invention3 2-The potentiometric titration of content, including following step
It is rapid:
The HCl standard solution of S1, the HCl standard solution for preparing 2mol/L and 0.1mol/L；
S2, lithium hydroxide is placed in titration outfit, the HCl standard solution of pure water and 2mol/L is added, stirred to complete
Dissolution obtains prepare liquid；
S3, using automatical potentiometric titrimeter, using phenolphthalein indicator and methyl orange indicator as indicator, with 0.1mol/L's
HCl standard solution is that titrating solution titrates prepare liquid；
Wherein, in S1, during preparing the HCl standard solution of 2mol/L and the HCl standard solution of 0.1mol/L,
Using methyl red-bromocresol green as indicator, with Na2CO3For its concentration of benchmark substance accurate calibration；
In S2, the mass volume ratio of lithium hydroxide and pure water is 2.2:25g/mL；The HCl standard of pure water and 2mol/L are molten
The volume ratio of liquid is 1:1；
In S2, the pure water is the pure water after boiling；
In S3, the model thunder magnetic ZDJ-4A of the automatical potentiometric titrimeter；
In S3, the concentration of the phenolphthalein indicator is 0.8g/L；The concentration of the methyl orange indicator is 12g/L；
The specific steps that prepare liquid is titrated in S3 are as follows: start to drip after phenolphthalein indicator is added into prepare liquid
It is fixed, a titrating solution is obtained by reaching the first equivalent point when red bleach when prepare liquid, automatical potentiometric titrimeter is shown automatically
The volume V1 and current potential mv1 of the titrating solution of consumption；Then methyl orange indicator is added in Xiang Yici titrating solution, to a titrating solution
The second equivalent point is reached when becoming orange by yellow, automatical potentiometric titrimeter shows the volume V2 and current potential of the titrating solution of consumption automatically
mv2；
LiOH and CO in lithium hydroxide is calculated separately by formula I and formula II3 2-Mass content, respectively with mass fraction
ω(LiOH)、ω(CO3 2-) indicate, unit %:
Wherein, in formula:
The concentration of the HCl standard solution of C1-2mol/L, mol/L；
The concentration of the HCl standard solution of C2-0.1mol/L, mol/L；
The quality of lithium hydroxide sample, g used in m-；
The volume of the titrating solution of the first equivalent point of V1- consumption, mL；
The volume of the titrating solution of the second equivalent point of V2- consumption, mL；
The molal weight of 23.95-LiOH, g/mol；
60-CO3 2-Molal weight, g/mol.
Embodiment 4
LiOH and CO in a kind of measurement lithium hydroxide proposed by the present invention3 2-The potentiometric titration of content, including following step
It is rapid:
S1,0.1g bromocresol green is weighed, is dissolved in the ethanol solution that 100mL mass fraction is 95%, obtains bromocresol green
Solution；0.2g methyl red is weighed, is dissolved in the ethyl alcohol that 100mL mass fraction is 95% and obtains methyl red solution；Pipette 30mL bromine
Cresols green solution and 10mL methyl red solution are mixed to get methyl red-bromocresol green indicator；
The preparation of the HCl standard solution of 2mol/L:
Pipette 167mL concentrated hydrochloric acid (density 1.19g/mL, HCl mass fraction be 37%), be placed in 1000mL volumetric flask,
It is diluted to scale with water, is shaken up, Hydrochloric Standard Titration is obtained, wait mark；By sodium carbonate in 280 DEG C of high temperature furnace calcination 2h
And be cooled to room temperature to obtain standard reagent in drier, the standard reagent of three parts of 2.6500g is weighed, is respectively placed in three
In the conical flask of 250mL, the dissolution of 50mL water is respectively added in each conical flask, and 10 drop methyl reds-bromocresol green instruction is added
Agent becomes claret by green with solution is titrated to target Hydrochloric Standard Titration, and heating is boiled to solution again virescence
(mainly remove CO2), it is cooling, continue to titrate, until solution green becomes claret, as terminal.The consumed salt acidity scale of parallel calibration
0.10mL is not to be exceeded in quasi- the very poor of titration solution volume, takes its average value；
Blank test is done in company with calibration；
The actual concentrations that the hydrochloric acid standard solution of 2mol/L is indicated with C are calculated by formula III:
Wherein, in formula:
The quality of m- standard reagent sodium carbonate, g；
V- titrates the volume of standard reagent carbonic acid sodium waste Hydrochloric Standard Titration, mL；
V0- titrates the volume of blank solution consumption Hydrochloric Standard Titration, mL；
52.99- with 1/2Na2CO3For the molal weight of basic unit, g/mol；
The preparation of the HCl standard solution of 0.1mol/L:
The pure concentrated hydrochloric acid of 8.3mL (density 1.19g/mL, HCl mass fraction 37%) is measured in 1000mL volumetric flask, adds water
It is diluted to scale, is shaken up, Hydrochloric Standard Titration is obtained, wait mark；By sodium carbonate in 270 DEG C of high temperature furnace calcination 2h and in
Be cooled to room temperature to obtain standard reagent in drier, weigh the standard reagent of three parts of 0.1325g, be respectively placed in three it is different
In 250mL conical flask, the dissolution of 50mL water is respectively added in conical flask, and 10 drop methyl red-bromocresol green indicator are added, then
Claret is become from green with solution is titrated to target Hydrochloric Standard Titration, heating boils 2min and drives away CO2, make solution
Again virescence, it is cooling, continue to be titrated to claret to be terminal.The consumed Hydrochloric Standard Titration volume of parallel calibration
It is very poor that 0.10mL is not to be exceeded, take its average value；
Blank test is done in company with calibration；
The actual concentrations that 0.1mol/L hydrochloric acid standard solution is indicated with C ' are calculated by formula IV:
Wherein, in formula:
The quality of m- standard reagent sodium carbonate, g；
V- titrates the volume of standard reagent carbonic acid sodium waste Hydrochloric Standard Titration, mL；
V0- titrates the volume of blank solution consumption Hydrochloric Standard Titration, mL；
52.99- with 1/2Na2CO3For the molal weight of basic unit, g/mol；
S2, individual sample lithium hydroxide 2.2000g is accurately weighed, is placed in the titration cup for being placed with magnet rotor in advance, is used in combination
Preservative film covers titration rim of a cup and sample is avoided to contact with air, and then 25mL is added and has boiled along wall of cup and drives away CO2Deionization
Preservative film sealing is placed on and carries out stirring to get solution on magnetic stirring apparatus by water；25.00mL 2mol/L is pipetted with pipette
HCl standard solution into solution, continue stirring be completely dissolved to obtain prepare liquid to sample；
S3, using the automatical potentiometric titrimeter of thunder magnetic ZDJ-4A model, be to refer to phenolphthalein indicator and methyl orange indicator
Show agent, prepare liquid titrated as titrating solution using the HCl standard solution of 0.1mol/L, concrete operations are as follows:
Potentiometric titrimeter switch is opened, counter electrode socket setting (electrode 1), buret (10mL) and buret are set
Coefficient (0.9960)；Pipette is inserted into distilled water, minim pipette is inserted into waste liquid bottle, presses " F3 " (cleaning) key, and it clicks and determines,
Instrument starts to clean 3 times automatically, and distilled water is changed into the HCl standard solution of 0.1mol/L after cleaning, continues (clear by " F3 "
Wash) key, it clicks and determines, instrument starts to clean 3 times automatically, and the HCl standard solution rinse of 0.1mol/L finishes and automatic liquid supply, really
Recognize bubble-free in entire pipette；Reference electrode and glass electrode are taken out wash with distilled water and wiped clean and is placed on titration stand
For use；
" Stirrer " (stirring) key is pressed, setting mixing speed is 25r/min；" Setup " (setting) key is pressed, " pre- drop is found
Determine parameter " one, it presses " terminating volume " and " terminal jumping " that the setting of " F2 " (setting) key is suitable for, then press " Exit " and (exit) key
Exit pre- titration parameters setting；
Titration cup equipped with prepare liquid is gone on the magnetic stirring apparatus of automatical potentiometric titrimeter, 4 drop phenolphthalein instructions are added dropwise
Agent, by electrode group and minim pipette insertion prepare liquid liquid level hereinafter, starting titrimetry: pressing " F1 " (titration) key, instrument shows " drop
Mould-fixed " state, selection " pre- titration " press " F2 " (confirmation) key, select " mv titration " to press " F2 " (confirmation) key again, instrument starts
Automatically titrated in advance, it is to be titrated to the first equivalent point when instrument long sound prompt automatically, the display consumption of the screen lower left corner
The volume Ep1V1 and current potential mv1, visual observation of the HCl standard solution of 0.1mol/L are shown as, and solution is become by red in titration cup
It is colourless, record V1 and current potential mv1；When in titration cup solution red shoal close to it is colourless when, immediately be added dropwise 3 drop methyl oranges instruction
Agent, instrument continue to titrate, instrument long sound prompt automatically, the 0.1mol/L of the screen lower left corner display consumption when finding the second equivalent point
HCl standard solution volume Ep2V2 and current potential mv2, visual observation show as, solution becomes orange by yellow in titration cup, note
Record V2 and current potential mv2.Stop titration, instrument carries out fluid infusion automatically, after instrument can show endpoint results, be bonded by " exiting "
Shu Benci titration；Wherein, methyl orange indicator is prepared according to following technique: 0.1g methyl orange is weighed, is dissolved in 70 DEG C of water, it is cold
But, 100mL is diluted to obtain；Phenolphthalein indicator is prepared according to following technique: being weighed 1.0g phenolphthalein, is dissolved in 100mL mass fraction
To be obtained in 95% ethyl alcohol；
LiOH and CO in lithium hydroxide3 2-Mass content is calculated separately by formula I, II, respectively with mass fraction ω (LiOH),
ω(CO3 2-) indicate, unit %:
Wherein, in formula:
The C, mol/L that the concentration of the HCl standard solution of C1-2mol/L, i.e. formula III are calculated；
The C ', mol/L that the concentration of the HCl standard solution of C2-0.1mol/L, i.e. formula IV are calculated；
The quality of m- lithium hydroxide sample, g；
The volume of the HCl standard solution of the 0.1mol/L of the-the first equivalent point of V1 (Ep1) consumption, mL；
The volume of the HCl standard solution of the 0.1mol/L of the-the second equivalent point of V2 (Ep2) consumption, mL；
The molal weight of 23.95-LiOH, g/mol；
60-CO3 2-Molal weight, g/mol.
Precision Experiment
A certain lithium hydroxide sample is tested using the method for embodiment 4, parallel titration 6 times calculates LiOH in lithium hydroxide
And CO3 2-Content, as a result as shown in the table:
RSD shows that detection method precision of the present invention is good less than 1%.
It can be seen that main content in potentiometric determination lithium hydroxide of the present invention by the above precision test
LiOH and CO3 2-Method be to facilitate feasible, improve analysis efficiency and accuracy, avoid the terminal erroneous judgement of manual titration
The human error generated with certain operations, while big batch sample is detected, method is simple and easy, convenient and reliable.
Embodiment 5
The present embodiment difference from Example 4 is only that: in S2: individual sample lithium hydroxide 0.7000g is accurately weighed,
Other are same as Example 4.
5 lithium hydroxide samples are tested respectively using the method for embodiment 5, calculate the content of LiOH in lithium hydroxide, knot
Fruit is as shown in the table:
| Sample serial number | Weigh quality/g | Titration volumes (V1)/mL | LiOH/% |
| Sample 1 | 0.7004 | 8.403 | 57.2539 |
| Sample 2 | 0.7003 | 8.398 | 57.1871 |
| Sample 3 | 0.7000 | 8.370 | 57.0616 |
| Sample 4 | 0.7000 | 8.358 | 56.9798 |
| Sample 5 | 0.7001 | 8.366 | 57.0262 |
5 experimental result of embodiment can be seen that main content in potentiometric determination lithium hydroxide of the present invention
The result of LiOH or more stable, method is simple and easy, convenient and reliable.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. LiOH and CO in a kind of measurement lithium hydroxide3 2-The potentiometric titration of content, which comprises the following steps:
The HCl standard solution of S1, the HCl standard solution for preparing 2mol/L and 0.1mol/L；
S2, lithium hydroxide is placed in titration outfit, the HCl standard solution of pure water and 2mol/L is added, stirring is to being completely dissolved
Obtain prepare liquid；
S3, using automatical potentiometric titrimeter, using phenolphthalein indicator and methyl orange indicator as indicator, with the HCl of 0.1mol/L
Standard solution is that titrating solution titrates prepare liquid.
2. measuring LiOH and CO in lithium hydroxide according to claim 13 2-The potentiometric titration of content, which is characterized in that
In S1, during preparing the HCl standard solution of 2mol/L and the HCl standard solution of 0.1mol/L, with methyl red-bromine cresols
Green is indicator, with Na2CO3For its concentration of benchmark substance accurate calibration.
3. LiOH and CO in measurement lithium hydroxide according to claim 1 or claim 23 2-The potentiometric titration of content, feature exist
In in S2, the mass volume ratio of lithium hydroxide and pure water is 2.2:25g/mL；The HCl standard solution of pure water and 2mol/L
Volume ratio is 1:1.
4. LiOH and CO in measurement lithium hydroxide described in any one of -3 according to claim 13 2-The potentiometric titration of content,
It is characterized in that, in S2, the pure water is the pure water after boiling.
5. LiOH and CO in measurement lithium hydroxide described in any one of -4 according to claim 13 2-The potentiometric titration of content,
It is characterized in that, in S3, the model thunder magnetic ZDJ-4A of the automatical potentiometric titrimeter.
6. LiOH and CO in measurement lithium hydroxide described in any one of -5 according to claim 13 2-The potentiometric titration of content,
It is characterized in that, in S3, the concentration of the phenolphthalein indicator is 0.8-1.2g/L；The concentration of the methyl orange indicator is 7-
12g/L。
7. LiOH and CO in measurement lithium hydroxide described in any one of -6 according to claim 13 2-The potentiometric titration of content,
It is characterized in that, the specific steps that prepare liquid is titrated in S3 are as follows: start to drip after phenolphthalein indicator is added into prepare liquid
It is fixed, a titrating solution is obtained by reaching the first equivalent point when red bleach when prepare liquid, automatical potentiometric titrimeter is shown automatically
The volume V1 and current potential mv1 of the titrating solution of consumption；Then methyl orange indicator is added in Xiang Yici titrating solution, to a titrating solution
The second equivalent point is reached when becoming orange by yellow, automatical potentiometric titrimeter shows the volume V2 and current potential of the titrating solution of consumption automatically
mv2；
LiOH and CO in lithium hydroxide is calculated separately by formula I and formula II3 2-Mass content, respectively with mass fraction ω
(LiOH)、ω(CO3 2-) indicate, unit %:
Wherein, in formula:
The concentration of the HCl standard solution of C1-2mol/L, mol/L；
The concentration of the HCl standard solution of C2-0.1mol/L, mol/L；
The quality of lithium hydroxide sample, g used in m-；
The volume of the titrating solution of the first equivalent point of V1- consumption, mL；
The volume of the titrating solution of the second equivalent point of V2- consumption, mL；
The molal weight of 23.95-LiOH, g/mol；
60-CO3 2-Molal weight, g/mol.
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| CN110320315A (en) * | 2019-07-29 | 2019-10-11 | 株洲升华科技有限公司 | The residual alkali detection method of content of tertiary cathode material and its application |
| CN111129486A (en) * | 2019-12-27 | 2020-05-08 | 中天新兴材料有限公司 | Method for preparing ternary cathode material of lithium battery |
| CN111948335A (en) * | 2020-06-29 | 2020-11-17 | 北京当升材料科技股份有限公司 | Method for testing residual alkali content in coated modified cathode material and application thereof |
| CN112881589A (en) * | 2021-03-12 | 2021-06-01 | 江西云威新材料有限公司 | Method for detecting carbonate ion content in lithium hydroxide monohydrate |
| CN114563527A (en) * | 2022-02-26 | 2022-05-31 | 江西金辉锂业有限公司 | Analysis method for determining main content of lithium carbonate by utilizing full-automatic potentiometric titrator |
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| CN110320315A (en) * | 2019-07-29 | 2019-10-11 | 株洲升华科技有限公司 | The residual alkali detection method of content of tertiary cathode material and its application |
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| CN111948335A (en) * | 2020-06-29 | 2020-11-17 | 北京当升材料科技股份有限公司 | Method for testing residual alkali content in coated modified cathode material and application thereof |
| CN111948335B (en) * | 2020-06-29 | 2021-08-24 | 北京当升材料科技股份有限公司 | Method for testing residual alkali content in coated modified cathode material and application thereof |
| CN112881589A (en) * | 2021-03-12 | 2021-06-01 | 江西云威新材料有限公司 | Method for detecting carbonate ion content in lithium hydroxide monohydrate |
| CN114563527A (en) * | 2022-02-26 | 2022-05-31 | 江西金辉锂业有限公司 | Analysis method for determining main content of lithium carbonate by utilizing full-automatic potentiometric titrator |
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