1、4-01-27 MIL-L-48768 (PA) i9 June i975 MILITARY SPECIFICATION LITHIUM RESERVE BATTERY ELECTROLYTE This specification is approved for use by all Departments and Agencies of the. Department of Defense. 1. SCOPE 1.1 This specification covers a type of electrolyte for use in lithium reserve type batterie
2、s (see 6.3). 2. APPLICABLE DOCUMENTS 2.1. The following documents of the issue in effect on date of invitation for bfds or request for proposal form a part of this speci- fication to the extent specified herein. SPECIFICATIONS MILITARY MIL-A-48078 - Ammunition, Standard Quality Assurance MIL-L-48765
3、 - Lithium Hexafluoroarsenate MIL-L-48766 - Lithium Tetrafluoroborate MIL-M-48767 - Methyl Formate Provisions, General Specification For STANDARDS MILITARY MIL-STD-129 - Marking for Shipping and Storage (Copies of specifications, standards, drawings, and publications required by suppliers in connect
4、ion with specific procurement function should be obtained from the procuring activity or as directed by the contractipg officer). FSC: 6810 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . , , MIL-L-q7b b W 7977706 0323250 W MIL-L-48768 (PA) 2.2 O
5、ther publications.-The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. AMERICAN SOCIETY FOR TESTING AND MATERIALS ASTM-E70 - pH of Aqueous Solutio
6、ns with the Glass Electrode ASTM-E203 - Water Using Karl Fischer Reagent ASTM-E260 - General Gas Chromatography Procedures ASTM-E300 - Sampling Industrial Chemicals ASTM-Dq45 - Kinematic Viscosity of Transparent and Opaque Liquids (Application for copies should be addressed to the American Society f
7、or Testing and Materials, 1916 Race Street, Philadelphia, Penn- sylvania 19103). 3. REQUIREMENTS 3.1 Materials.-Materials used in the manufacture of the electrolyte shall conform with the specifications given below and shall be mixed in the proportions shown: Materials App 1 i cab 1 e Proportions By
8、 Specification Weigh (see 6.3) Lithium Hexaflu- Lithium Tetra- oroarsenate MIL-L-48765 f luoroborate MIL-L-48766 MIL-L- 4 8 7 6 7 Methyl Formate 18 1.72 40, p9 3.2 Properties.-The electrolyte shall conform to the following 2 Provided by IHSNot for ResaleNo reproduction or networking permitted withou
9、t license from IHS-,-,-MIL-L-48768 68 m 7777706 OL2125L T m MIL-L-48768 (PA) properties when tested in accordance with applicable paragraphs (see 6.5): Property Color Insoluble Matter Specific Gravity d 25.0 5 0.loC 25.0 5 0.loC centistokes Water,ppm,max Methanol,ppm,max Formic Acid,ppm,max Dimethyl
10、 Ether,ppm,max Total Impurities ,ppm, viscosity Purity max Refractive Index 25 + 2OC pH Q 25 + 2OC Diffussion Current, microamps Specific Conductance 25 5 0.loC Requirement Clear l) through a clean, tared glass medium porosity .filtering crucible. Use a small amount of methyl formate to aid in the t
11、ransfer. Dry the crucible and contents in an oven maintained at 85 + 5OC for 1 hour, cool in a desiccator and weigh. Calculate the Insoluble Matter as compared to the total LiAsF6 and LiBF4 according to the following equation: % Insoluble Matter = Wt Insoluble in Grams X 100 Volume Sample in Liters
12、x 429.22 4.4.3.3 Specific Gravity.-The specific gravity shall be determined .4.4.3.3.1 Equipment: by the following procedure: a. Two calibrated pycnometers (see Figure i) fitted with Thomas red rubber stoppers - cat. No. 1781-E93. b. 25cc syringe fitted with a 12 inch needle. C. Controlled temperatu
13、re chamber: 25OC - + 0.loC d. 20 cc of solution to be tested. 4.4.3.3.2 Procedure.-Weigh the dried pycnometers (with stopper). Fill each pycnometer until the solution is at least half way up the neck employing the 25 cc syringe and 12 inch needle. The needle 5 Provided by IHSNot for ResaleNo reprodu
14、ction or networking permitted without license from IHS-,-,-L MIL-L-47b b 777770b 0323254 5 MIL-L-48768 (PA) must be inserted well into the bulb of the pycnometer to insure that no.bubbles are trapped in the neck. Place the pycnometers in the controlled temperature chamber and allow them to reach the
15、 temperature (25 0.1OC). Record the volume in ml. Calculate the specific gravity employing the following equation: SG = Weight of solution X 1 Volume of solution 0.99707 g/CC Add the values obtained and divide by two to obtain the specific gravity of the solution being tested. 4.4.3.4 Vis-c-osity.-D
16、etermine the viscosity of the electrolyte in accordance with ASTM D-445$ Ostwald Type at 25.5 5 0.1OC. 4.4.3.5 Water.-Determine the water content of the sample in accordance with Method ASTM-E203. 4.4.3.6 Methanol, Formic Acid, Dimethyl Ether.-Determine the impurities in the electrolyte in accordanc
17、e with ASTM-E260 with following additions: a. Injector port - glass wood packed b. Column - Chromosorb 101, 4 ft. x 1/8“ diameter. C. Detector - Flame ionization (methanol and dimethyl ether) d. Thermal Conductivity (Formic Acid) e. Carrier Gas - Helium at 20 cc/min. Calculate the total impurities b
18、y adding values found in 4.4.3.6 to the value for water in 4.4.3.5. t 4.4.3.7 Refractive Index.-Determine the refractive index of the electrolyte using a Fisher Refractmeter or equivalent in accordance with the manufacturers procedural instructions of 25 +. 2OC. 4.4.3.8 pH.-Determine the pH of the e
19、lectrolyte in accordance with method ASTM-E70 at 25 diluted in the ratio of one part electrolyte to nine parts of distilled water and pH measured immediately. 2OC except that electrolyte shall be 4.4.3.9 Diffusion Current.-Determine the -diffussion current of the electrolyte using standard polarogra
20、phic techniques in 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-t MIL-L-48768 68 m 7977906 0121255 7 m MIL-L-48768 (PA) accordance with procedures in a standard or reference textbook with following modifications: a. Reference electrode - Lithium
21、 b. Auxiliary electrode - Lithium c. Working electrode - Dropping Mercury d. Measured at 0.0 to -1.75 volts versus the hydrogen electrode. 4.4.3.10 Specific Conductance - Determine the specific conductance 4.4.3.10.1 Equipment .- of the electrolyte at 25.0 - + 0.1OC as follows: a. Beckman Conductivi
22、ty Bridge or equivalent (i) b. Decade Capacitors (1) C. Controlled temperature chamber: 25OC 2 1O.C (1) d. Calibrated conduct2vity cells of 5 ml volume air e. Solution to be tested (10 cc) f. 10 cc syringe (i) tight seals (2) Procedure:. Transfer 3 ml of the solution to be tested to each conductivit
23、y cell. (The conductivity cells should be dried thoroughly prior to use.) Place the cells in the controlled temperature chamber and allow them to reach temperature (25 2 0.1OC). Record three separate readings in ohms employing a frequency of 10,000 Hertz and average the values. Calculate the specifi
24、c conductance (Ls) according to the following equations: Ls = K/R Where: K = cell constant R = resistance in ohms Add the two values obtained and divide by two to obtain the specific conductance of the solution being tested. 5. PREPARATION FOR DELIVERY 5.1 Packing.-(see 6.5) 5.1.1 Level A and Level
25、C.-Unless otherwise specified, the electrolyte shall be packed in accordance with manufacturers commercial practice to assure acceptance by common carrier for safe delivery at first destination for immediatex use. . 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
26、se from IHS-,-,-MIL-L-487b 68 399970b OL2L25b 9 MIL-L-48768 (PA) shall be marked in accordance with MIL-STD-129, and shall include the lot number. 5.2 Marking.-Unless otherwise specified, the shipping containers 6. NOTES 6.1 Ordering data.-See MIL-A-48078(PA). 6.2 Prior approval of the Contracting O
27、fficer is required for use of equivalent test methods. A description of the proposed method should be submitted thru the Contracting Officer to: Commander, ATTN: SARPA- Capacity at neck O. O1 rnl. FIGlD 1 PYCIiOME?ER FOR SPECIFIC GRAVITY DETERMIN,L_TION * U. S. GOVERNMENT PRINTING WFICE: 1975 43-7&/0475 -=-a 9 b . . . _ . . . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
