Lithium oxalate
IUPAC name
Lithium oxalate
Other names
  • Dilithium oxalate
  • di-Lithium oxalate[1]
  • Oxalic acid dilithium salt[2]
3D model (JSmol)
ECHA InfoCard 100.008.232 Edit this at Wikidata
EC Number
  • 209-054-1
  • InChI=1S/C2H2O4-C.2Li/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);;/q;2*+1/p-2
  • [Li+].[Li+].[O-]C(=O)C([O-])=O
Molar mass 101.90 g·mol−1
Appearance Colorless crystalline solid
Density 2.12 g/cm3
6.6 g per 100 g of water
GHS labelling:
GHS07: Exclamation mark
H302, H312
P264, P270, P280, P301+P312, P302+P352, P312, P322, P330, P363, P501
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Lithium oxalate is an organic compound with the chemical formula Li2C2O4. It is a salt of lithium metal and oxalic acid.[3][4] It consists of lithium cations Li+ and oxalate anions C2O2−4. Lithium oxalate is soluble in water and converts to lithium oxide when heated.[5]


One of the methods of synthesis is the reaction of direct neutralization of oxalic acid with lithium hydroxide:

2 LiOH + H2C2O4 → Li2C2O4 + 2 H2O


The compound crystallizes in the monoclinic system, cell parameters a = 3.400 Å, b = 5.156 Å, c = 9.055 Å, β = 95.60°, Z = 4.[3]

Lithium oxalate decomposes when heated at 410–500 °C (770–932 °F; 683–773 K):

Li2C2O4 → Li2CO3 + CO


In pyrotechnics, the compound is used to color the flame red.[6]


  1. ^ "553-91-3 | Sigma-Aldrich". Sigma Aldrich. Retrieved 15 June 2021.
  2. ^ "di-Lithium oxalate". Merck Millipore. Retrieved 15 June 2021.
  3. ^ a b Beagley, B.; Small, R. W. H. (1964-06-10). "The structure of lithium oxalate". Acta Crystallographica. 17 (6): 783–788. doi:10.1107/S0365110X64002079. Retrieved 15 June 2021.
  4. ^ Solchenbach, Sophie; Wetjen, Morten; Pritzl, Daniel; Schwenke, K. Uta; Gasteiger, Hubert A. (2018). "Lithium Oxalate as Capacity and Cycle-Life Enhancer in LNMO/Graphite and LNMO/SiG Full Cells". Journal of the Electrochemical Society. 165 (3): A512–A524. doi:10.1149/2.0611803jes. S2CID 104199908.
  5. ^ "Lithium Oxalate". Millipore-Sigma. Retrieved 10 Feb 2022.
  6. ^ Koch, Ernst-Christian (2009). Is it possible to Obtain a Deep Red Pyrotechnic Flame Based on Lithium?. 36th International Pyrotechnics Seminar. doi:10.13140/2.1.1657.0567. Retrieved 15 June 2021.